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-rw-r--r--gcc/ChangeLog5
-rw-r--r--gcc/flags.h8
2 files changed, 13 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 649c391..9f89407 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2001-01-05 Michael Meissner <meissner@redhat.com>
+
+ * flags.h (flag_reorder_blocks): Add declaration.
+ (flag_rename_block): Ditto.
+
2001-01-05 DJ Delorie <dj@redhat.com>
* function.c (reorder_blocks): Make sure the flags are all reset
diff --git a/gcc/flags.h b/gcc/flags.h
index bc686e4..fc19efe 100644
--- a/gcc/flags.h
+++ b/gcc/flags.h
@@ -192,6 +192,14 @@ extern int flag_test_coverage;
extern int flag_branch_probabilities;
+/* Nonzero if basic blocks should be reordered. */
+
+extern int flag_reorder_blocks;
+
+/* Nonzero if registers should be renamed. */
+
+extern int flag_rename_registers;
+
/* Nonzero for -pedantic switch: warn about anything
that standard C forbids. */
generated by cgit v1.1 at 2025-06-06 02:36:10 +0000
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/* Expand builtin functions.
   Copyright (C) 1988-2021 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

/* Legacy warning!  Please add no further builtin simplifications here
   (apart from pure constant folding) - builtin simplifications should go
   to match.pd or gimple-fold.c instead.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "target.h"
#include "rtl.h"
#include "tree.h"
#include "memmodel.h"
#include "gimple.h"
#include "predict.h"
#include "tm_p.h"
#include "stringpool.h"
#include "tree-vrp.h"
#include "tree-ssanames.h"
#include "expmed.h"
#include "optabs.h"
#include "emit-rtl.h"
#include "recog.h"
#include "diagnostic-core.h"
#include "alias.h"
#include "fold-const.h"
#include "fold-const-call.h"
#include "gimple-ssa-warn-restrict.h"
#include "stor-layout.h"
#include "calls.h"
#include "varasm.h"
#include "tree-object-size.h"
#include "tree-ssa-strlen.h"
#include "realmpfr.h"
#include "cfgrtl.h"
#include "except.h"
#include "dojump.h"
#include "explow.h"
#include "stmt.h"
#include "expr.h"
#include "libfuncs.h"
#include "output.h"
#include "typeclass.h"
#include "langhooks.h"
#include "value-prof.h"
#include "builtins.h"
#include "stringpool.h"
#include "attribs.h"
#include "asan.h"
#include "internal-fn.h"
#include "case-cfn-macros.h"
#include "gimple-fold.h"
#include "intl.h"
#include "file-prefix-map.h" /* remap_macro_filename()  */
#include "gomp-constants.h"
#include "omp-general.h"
#include "tree-dfa.h"
#include "gimple-iterator.h"
#include "gimple-ssa.h"
#include "tree-ssa-live.h"
#include "tree-outof-ssa.h"
#include "attr-fnspec.h"
#include "demangle.h"

struct target_builtins default_target_builtins;
#if SWITCHABLE_TARGET
struct target_builtins *this_target_builtins = &default_target_builtins;
#endif

/* Define the names of the builtin function types and codes.  */
const char *const built_in_class_names[BUILT_IN_LAST]
  = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};

#define DEF_BUILTIN(X, N, C, T, LT, B, F, NA, AT, IM, COND) #X,
const char * built_in_names[(int) END_BUILTINS] =
{
#include "builtins.def"
};

/* Setup an array of builtin_info_type, make sure each element decl is
   initialized to NULL_TREE.  */
builtin_info_type builtin_info[(int)END_BUILTINS];

/* Non-zero if __builtin_constant_p should be folded right away.  */
bool force_folding_builtin_constant_p;

static int target_char_cast (tree, char *);
static rtx get_memory_rtx (tree, tree);
static int apply_args_size (void);
static int apply_result_size (void);
static rtx result_vector (int, rtx);
static void expand_builtin_prefetch (tree);
static rtx expand_builtin_apply_args (void);
static rtx expand_builtin_apply_args_1 (void);
static rtx expand_builtin_apply (rtx, rtx, rtx);
static void expand_builtin_return (rtx);
static enum type_class type_to_class (tree);
static rtx expand_builtin_classify_type (tree);
static rtx expand_builtin_mathfn_3 (tree, rtx, rtx);
static rtx expand_builtin_mathfn_ternary (tree, rtx, rtx);
static rtx expand_builtin_interclass_mathfn (tree, rtx);
static rtx expand_builtin_sincos (tree);
static rtx expand_builtin_cexpi (tree, rtx);
static rtx expand_builtin_int_roundingfn (tree, rtx);
static rtx expand_builtin_int_roundingfn_2 (tree, rtx);
static rtx expand_builtin_next_arg (void);
static rtx expand_builtin_va_start (tree);
static rtx expand_builtin_va_end (tree);
static rtx expand_builtin_va_copy (tree);
static rtx inline_expand_builtin_bytecmp (tree, rtx);
static rtx expand_builtin_strcmp (tree, rtx);
static rtx expand_builtin_strncmp (tree, rtx, machine_mode);
static rtx expand_builtin_memchr (tree, rtx);
static rtx expand_builtin_memcpy (tree, rtx);
static rtx expand_builtin_memory_copy_args (tree dest, tree src, tree len,
					    rtx target, tree exp,
					    memop_ret retmode,
					    bool might_overlap);
static rtx expand_builtin_memmove (tree, rtx);
static rtx expand_builtin_mempcpy (tree, rtx);
static rtx expand_builtin_mempcpy_args (tree, tree, tree, rtx, tree, memop_ret);
static rtx expand_builtin_strcat (tree);
static rtx expand_builtin_strcpy (tree, rtx);
static rtx expand_builtin_strcpy_args (tree, tree, tree, rtx);
static rtx expand_builtin_stpcpy (tree, rtx, machine_mode);
static rtx expand_builtin_stpncpy (tree, rtx);
static rtx expand_builtin_strncat (tree, rtx);
static rtx expand_builtin_strncpy (tree, rtx);
static rtx expand_builtin_memset (tree, rtx, machine_mode);
static rtx expand_builtin_memset_args (tree, tree, tree, rtx, machine_mode, tree);
static rtx expand_builtin_bzero (tree);
static rtx expand_builtin_strlen (tree, rtx, machine_mode);
static rtx expand_builtin_strnlen (tree, rtx, machine_mode);
static rtx expand_builtin_alloca (tree);
static rtx expand_builtin_unop (machine_mode, tree, rtx, rtx, optab);
static rtx expand_builtin_frame_address (tree, tree);
static tree stabilize_va_list_loc (location_t, tree, int);
static rtx expand_builtin_expect (tree, rtx);
static rtx expand_builtin_expect_with_probability (tree, rtx);
static tree fold_builtin_constant_p (tree);
static tree fold_builtin_classify_type (tree);
static tree fold_builtin_strlen (location_t, tree, tree, tree);
static tree fold_builtin_inf (location_t, tree, int);
static tree rewrite_call_expr (location_t, tree, int, tree, int, ...);
static bool validate_arg (const_tree, enum tree_code code);
static rtx expand_builtin_fabs (tree, rtx, rtx);
static rtx expand_builtin_signbit (tree, rtx);
static tree fold_builtin_memcmp (location_t, tree, tree, tree);
static tree fold_builtin_isascii (location_t, tree);
static tree fold_builtin_toascii (location_t, tree);
static tree fold_builtin_isdigit (location_t, tree);
static tree fold_builtin_fabs (location_t, tree, tree);
static tree fold_builtin_abs (location_t, tree, tree);
static tree fold_builtin_unordered_cmp (location_t, tree, tree, tree, enum tree_code,
					enum tree_code);
static tree fold_builtin_varargs (location_t, tree, tree*, int);

static tree fold_builtin_strpbrk (location_t, tree, tree, tree, tree);
static tree fold_builtin_strspn (location_t, tree, tree, tree);
static tree fold_builtin_strcspn (location_t, tree, tree, tree);

static rtx expand_builtin_object_size (tree);
static rtx expand_builtin_memory_chk (tree, rtx, machine_mode,
				      enum built_in_function);
static void maybe_emit_chk_warning (tree, enum built_in_function);
static void maybe_emit_sprintf_chk_warning (tree, enum built_in_function);
static tree fold_builtin_object_size (tree, tree);
static bool check_read_access (tree, tree, tree = NULL_TREE, int = 1);
static bool compute_objsize_r (tree, int, access_ref *, ssa_name_limit_t &,
			       pointer_query *);

unsigned HOST_WIDE_INT target_newline;
unsigned HOST_WIDE_INT target_percent;
static unsigned HOST_WIDE_INT target_c;
static unsigned HOST_WIDE_INT target_s;
char target_percent_c[3];
char target_percent_s[3];
char target_percent_s_newline[4];
static tree do_mpfr_remquo (tree, tree, tree);
static tree do_mpfr_lgamma_r (tree, tree, tree);
static void expand_builtin_sync_synchronize (void);

access_ref::access_ref (tree bound /* = NULL_TREE */,
			bool minaccess /* = false */)
: ref (), eval ([](tree x){ return x; }), deref (), trail1special (true),
  base0 (true), parmarray ()
{
  /* Set to valid.  */
  offrng[0] = offrng[1] = 0;
  /* Invalidate.   */
  sizrng[0] = sizrng[1] = -1;

  /* Set the default bounds of the access and adjust below.  */
  bndrng[0] = minaccess ? 1 : 0;
  bndrng[1] = HOST_WIDE_INT_M1U;

  /* When BOUND is nonnull and a range can be extracted from it,
     set the bounds of the access to reflect both it and MINACCESS.
     BNDRNG[0] is the size of the minimum access.  */
  tree rng[2];
  if (bound && get_size_range (bound, rng, SR_ALLOW_ZERO))
    {
      bndrng[0] = wi::to_offset (rng[0]);
      bndrng[1] = wi::to_offset (rng[1]);
      bndrng[0] = bndrng[0] > 0 && minaccess ? 1 : 0;
    }
}

/* Return the PHI node REF refers to or null if it doesn't.  */

gphi *
access_ref::phi () const
{
  if (!ref || TREE_CODE (ref) != SSA_NAME)
    return NULL;

  gimple *def_stmt = SSA_NAME_DEF_STMT (ref);
  if (gimple_code (def_stmt) != GIMPLE_PHI)
    return NULL;

  return as_a <gphi *> (def_stmt);
}

/* Determine and return the largest object to which *THIS.  If *THIS
   refers to a PHI and PREF is nonnull, fill *PREF with the details
   of the object determined by compute_objsize(ARG, OSTYPE) for each
   PHI argument ARG.  */

tree
access_ref::get_ref (vec<access_ref> *all_refs,
		     access_ref *pref /* = NULL */,
		     int ostype /* = 1 */,
		     ssa_name_limit_t *psnlim /* = NULL */,
		     pointer_query *qry /* = NULL */) const
{
  gphi *phi_stmt = this->phi ();
  if (!phi_stmt)
    return ref;

  /* FIXME: Calling get_ref() with a null PSNLIM is dangerous and might
     cause unbounded recursion.  */
  ssa_name_limit_t snlim_buf;
  if (!psnlim)
    psnlim = &snlim_buf;

  if (!psnlim->visit_phi (ref))
    return NULL_TREE;

  /* Reflects the range of offsets of all PHI arguments refer to the same
     object (i.e., have the same REF).  */
  access_ref same_ref;
  /* The conservative result of the PHI reflecting the offset and size
     of the largest PHI argument, regardless of whether or not they all
     refer to the same object.  */
  pointer_query empty_qry;
  if (!qry)
    qry = &empty_qry;

  access_ref phi_ref;
  if (pref)
    {
      phi_ref = *pref;
      same_ref = *pref;
    }

  /* Set if any argument is a function array (or VLA) parameter not
     declared [static].  */
  bool parmarray = false;
  /* The size of the smallest object referenced by the PHI arguments.  */
  offset_int minsize = 0;
  const offset_int maxobjsize = wi::to_offset (max_object_size ());
  /* The offset of the PHI, not reflecting those of its arguments.  */
  const offset_int orng[2] = { phi_ref.offrng[0], phi_ref.offrng[1] };

  const unsigned nargs = gimple_phi_num_args (phi_stmt);
  for (unsigned i = 0; i < nargs; ++i)
    {
      access_ref phi_arg_ref;
      tree arg = gimple_phi_arg_def (phi_stmt, i);
      if (!compute_objsize_r (arg, ostype, &phi_arg_ref, *psnlim, qry)
	  || phi_arg_ref.sizrng[0] < 0)
	/* A PHI with all null pointer arguments.  */
	return NULL_TREE;

      /* Add PREF's offset to that of the argument.  */
      phi_arg_ref.add_offset (orng[0], orng[1]);
      if (TREE_CODE (arg) == SSA_NAME)
	qry->put_ref (arg, phi_arg_ref);

      if (all_refs)
	all_refs->safe_push (phi_arg_ref);

      const bool arg_known_size = (phi_arg_ref.sizrng[0] != 0
				   || phi_arg_ref.sizrng[1] != maxobjsize);

      parmarray |= phi_arg_ref.parmarray;

      const bool nullp = integer_zerop (arg) && (i || i + 1 < nargs);

      if (phi_ref.sizrng[0] < 0)
	{
	  if (!nullp)
	    same_ref = phi_arg_ref;
	  phi_ref = phi_arg_ref;
	  if (arg_known_size)
	    minsize = phi_arg_ref.sizrng[0];
	  continue;
	}

      const bool phi_known_size = (phi_ref.sizrng[0] != 0
				   || phi_ref.sizrng[1] != maxobjsize);

      if (phi_known_size && phi_arg_ref.sizrng[0] < minsize)
	minsize = phi_arg_ref.sizrng[0];

      /* Disregard null pointers in PHIs with two or more arguments.
	 TODO: Handle this better!  */
      if (nullp)
	continue;

      /* Determine the amount of remaining space in the argument.  */
      offset_int argrem[2];
      argrem[1] = phi_arg_ref.size_remaining (argrem);

      /* Determine the amount of remaining space computed so far and
	 if the remaining space in the argument is more use it instead.  */
      offset_int phirem[2];
      phirem[1] = phi_ref.size_remaining (phirem);

      if (phi_arg_ref.ref != same_ref.ref)
	same_ref.ref = NULL_TREE;

      if (phirem[1] < argrem[1]
	  || (phirem[1] == argrem[1]
	      && phi_ref.sizrng[1] < phi_arg_ref.sizrng[1]))
	/* Use the argument with the most space remaining as the result,
	   or the larger one if the space is equal.  */
	phi_ref = phi_arg_ref;

      /* Set SAME_REF.OFFRNG to the maximum range of all arguments.  */
      if (phi_arg_ref.offrng[0] < same_ref.offrng[0])
	same_ref.offrng[0] = phi_arg_ref.offrng[0];
      if (same_ref.offrng[1] < phi_arg_ref.offrng[1])
	same_ref.offrng[1] = phi_arg_ref.offrng[1];
    }

  if (phi_ref.sizrng[0] < 0)
    {
      /* Fail if none of the PHI's arguments resulted in updating PHI_REF
	 (perhaps because they have all been already visited by prior
	 recursive calls).  */
      psnlim->leave_phi (ref);
      return NULL_TREE;
    }

  if (!same_ref.ref && same_ref.offrng[0] != 0)
    /* Clear BASE0 if not all the arguments refer to the same object and
       if not all their offsets are zero-based.  This allows the final
       PHI offset to out of bounds for some arguments but not for others
       (or negative even of all the arguments are BASE0), which is overly
       permissive.  */
    phi_ref.base0 = false;

  if (same_ref.ref)
    phi_ref = same_ref;
  else
    {
      /* Replace the lower bound of the largest argument with the size
	 of the smallest argument, and set PARMARRAY if any argument
	 was one.  */
      phi_ref.sizrng[0] = minsize;
      phi_ref.parmarray = parmarray;
    }

  /* Avoid changing *THIS.  */
  if (pref && pref != this)
    *pref = phi_ref;

  psnlim->leave_phi (ref);

  return phi_ref.ref;
}

/* Return the maximum amount of space remaining and if non-null, set
   argument to the minimum.  */

offset_int
access_ref::size_remaining (offset_int *pmin /* = NULL */) const
{
  offset_int minbuf;
  if (!pmin)
    pmin = &minbuf;

  /* add_offset() ensures the offset range isn't inverted.  */
  gcc_checking_assert (offrng[0] <= offrng[1]);

  if (base0)
    {
      /* The offset into referenced object is zero-based (i.e., it's
	 not referenced by a pointer into middle of some unknown object).  */
      if (offrng[0] < 0 && offrng[1] < 0)
	{
	  /* If the offset is negative the remaining size is zero.  */
	  *pmin = 0;
	  return 0;
	}

      if (sizrng[1] <= offrng[0])
	{
	  /* If the starting offset is greater than or equal to the upper
	     bound on the size of the object, the space remaining is zero.
	     As a special case, if it's equal, set *PMIN to -1 to let
	     the caller know the offset is valid and just past the end.  */
	  *pmin = sizrng[1] == offrng[0] ? -1 : 0;
	  return 0;
	}

      /* Otherwise return the size minus the lower bound of the offset.  */
      offset_int or0 = offrng[0] < 0 ? 0 : offrng[0];

      *pmin = sizrng[0] - or0;
      return sizrng[1] - or0;
    }

  /* The offset to the referenced object isn't zero-based (i.e., it may
     refer to a byte other than the first.  The size of such an object
     is constrained only by the size of the address space (the result
     of max_object_size()).  */
  if (sizrng[1] <= offrng[0])
    {
      *pmin = 0;
      return 0;
    }

  offset_int or0 = offrng[0] < 0 ? 0 : offrng[0];

  *pmin = sizrng[0] - or0;
  return sizrng[1] - or0;
}

/* Add the range [MIN, MAX] to the offset range.  For known objects (with
   zero-based offsets) at least one of whose offset's bounds is in range,
   constrain the other (or both) to the bounds of the object (i.e., zero
   and the upper bound of its size).  This improves the quality of
   diagnostics.  */

void access_ref::add_offset (const offset_int &min, const offset_int &max)
{
  if (min <= max)
    {
      /* To add an ordinary range just add it to the bounds.  */
      offrng[0] += min;
      offrng[1] += max;
    }
  else if (!base0)
    {
      /* To add an inverted range to an offset to an unknown object
	 expand it to the maximum.  */
      add_max_offset ();
      return;
    }
  else
    {
      /* To add an inverted range to an offset to an known object set
	 the upper bound to the maximum representable offset value
	 (which may be greater than MAX_OBJECT_SIZE).
	 The lower bound is either the sum of the current offset and
	 MIN when abs(MAX) is greater than the former, or zero otherwise.
	 Zero because then then inverted range includes the negative of
	 the lower bound.  */
      offset_int maxoff = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
      offrng[1] = maxoff;

      if (max >= 0)
	{
	  offrng[0] = 0;
	  return;
	}

      offset_int absmax = wi::abs (max);
      if (offrng[0] < absmax)
	{
	  offrng[0] += min;
	  /* Cap the lower bound at the upper (set to MAXOFF above)
	     to avoid inadvertently recreating an inverted range.  */
	  if (offrng[1] < offrng[0])
	    offrng[0] = offrng[1];
	}
      else
	offrng[0] = 0;
    }

  if (!base0)
    return;

  /* When referencing a known object check to see if the offset computed
     so far is in bounds... */
  offset_int remrng[2];
  remrng[1] = size_remaining (remrng);
  if (remrng[1] > 0 || remrng[0] < 0)
    {
      /* ...if so, constrain it so that neither bound exceeds the size of
	 the object.  Out of bounds offsets are left unchanged, and, for
	 better or worse, become in bounds later.  They should be detected
	 and diagnosed at the point they first become invalid by
	 -Warray-bounds.  */
      if (offrng[0] < 0)
	offrng[0] = 0;
      if (offrng[1] > sizrng[1])
	offrng[1] = sizrng[1];
    }
}

/* Set a bit for the PHI in VISITED and return true if it wasn't
   already set.  */

bool
ssa_name_limit_t::visit_phi (tree ssa_name)
{
  if (!visited)
    visited = BITMAP_ALLOC (NULL);

  /* Return false if SSA_NAME has already been visited.  */
  return bitmap_set_bit (visited, SSA_NAME_VERSION (ssa_name));
}

/* Clear a bit for the PHI in VISITED.  */

void
ssa_name_limit_t::leave_phi (tree ssa_name)
{
  /* Return false if SSA_NAME has already been visited.  */
  bitmap_clear_bit (visited, SSA_NAME_VERSION (ssa_name));
}

/* Return false if the SSA_NAME chain length counter has reached
   the limit, otherwise increment the counter and return true.  */

bool
ssa_name_limit_t::next ()
{
  /* Return a negative value to let caller avoid recursing beyond
     the specified limit.  */
  if (ssa_def_max == 0)
    return false;

  --ssa_def_max;
  return true;
}

/* If the SSA_NAME has already been "seen" return a positive value.
   Otherwise add it to VISITED.  If the SSA_NAME limit has been
   reached, return a negative value.  Otherwise return zero.  */

int
ssa_name_limit_t::next_phi (tree ssa_name)
{
  {
    gimple *def_stmt = SSA_NAME_DEF_STMT (ssa_name);
    /* Return a positive value if the PHI has already been visited.  */
    if (gimple_code (def_stmt) == GIMPLE_PHI
	&& !visit_phi (ssa_name))
      return 1;
  }

  /* Return a negative value to let caller avoid recursing beyond
     the specified limit.  */
  if (ssa_def_max == 0)
    return -1;

  --ssa_def_max;

  return 0;
}

ssa_name_limit_t::~ssa_name_limit_t ()
{
  if (visited)
    BITMAP_FREE (visited);
}

/* Default ctor.  Initialize object with pointers to the range_query
   and cache_type instances to use or null.  */

pointer_query::pointer_query (range_query *qry /* = NULL */,
			      cache_type *cache /* = NULL */)
: rvals (qry), var_cache (cache), hits (), misses (),
  failures (), depth (), max_depth ()
{
  /* No op.  */
}

/* Return a pointer to the cached access_ref instance for the SSA_NAME
   PTR if it's there or null otherwise.  */

const access_ref *
pointer_query::get_ref (tree ptr, int ostype /* = 1 */) const
{
  if (!var_cache)
    {
      ++misses;
      return NULL;
    }

  unsigned version = SSA_NAME_VERSION (ptr);
  unsigned idx = version << 1 | (ostype & 1);
  if (var_cache->indices.length () <= idx)
    {
      ++misses;
      return NULL;
    }

  unsigned cache_idx = var_cache->indices[idx];
  if (var_cache->access_refs.length () <= cache_idx)
    {
      ++misses;
      return NULL;
    }

  access_ref &cache_ref = var_cache->access_refs[cache_idx];
  if (cache_ref.ref)
    {
      ++hits;
      return &cache_ref;
    }

  ++misses;
  return NULL;
}

/* Retrieve the access_ref instance for a variable from the cache if it's
   there or compute it and insert it into the cache if it's nonnonull.  */

bool
pointer_query::get_ref (tree ptr, access_ref *pref, int ostype /* = 1 */)
{
  const unsigned version
    = TREE_CODE (ptr) == SSA_NAME ? SSA_NAME_VERSION (ptr) : 0;

  if (var_cache && version)
    {
      unsigned idx = version << 1 | (ostype & 1);
      if (idx < var_cache->indices.length ())
	{
	  unsigned cache_idx = var_cache->indices[idx] - 1;
	  if (cache_idx < var_cache->access_refs.length ()
	      && var_cache->access_refs[cache_idx].ref)
	    {
	      ++hits;
	      *pref = var_cache->access_refs[cache_idx];
	      return true;
	    }
	}

      ++misses;
    }

  if (!compute_objsize (ptr, ostype, pref, this))
    {
      ++failures;
      return false;
    }

  return true;
}

/* Add a copy of the access_ref REF for the SSA_NAME to the cache if it's
   nonnull.  */

void
pointer_query::put_ref (tree ptr, const access_ref &ref, int ostype /* = 1 */)
{
  /* Only add populated/valid entries.  */
  if (!var_cache || !ref.ref || ref.sizrng[0] < 0)
    return;

  /* Add REF to the two-level cache.  */
  unsigned version = SSA_NAME_VERSION (ptr);
  unsigned idx = version << 1 | (ostype & 1);

  /* Grow INDICES if necessary.  An index is valid if it's nonzero.
     Its value minus one is the index into ACCESS_REFS.  Not all
     entries are valid.  */
  if (var_cache->indices.length () <= idx)
    var_cache->indices.safe_grow_cleared (idx + 1);

  if (!var_cache->indices[idx])
    var_cache->indices[idx] = var_cache->access_refs.length () + 1;

  /* Grow ACCESS_REF cache if necessary.  An entry is valid if its
     REF member is nonnull.  All entries except for the last two
     are valid.  Once nonnull, the REF value must stay unchanged.  */
  unsigned cache_idx = var_cache->indices[idx];
  if (var_cache->access_refs.length () <= cache_idx)
    var_cache->access_refs.safe_grow_cleared (cache_idx + 1);

  access_ref cache_ref = var_cache->access_refs[cache_idx - 1];
  if (cache_ref.ref)
  {
    gcc_checking_assert (cache_ref.ref == ref.ref);
    return;
  }

  cache_ref = ref;
}

/* Flush the cache if it's nonnull.  */

void
pointer_query::flush_cache ()
{
  if (!var_cache)
    return;
  var_cache->indices.release ();
  var_cache->access_refs.release ();
}

/* Return true if NAME starts with __builtin_ or __sync_.  */

static bool
is_builtin_name (const char *name)
{
  if (strncmp (name, "__builtin_", 10) == 0)
    return true;
  if (strncmp (name, "__sync_", 7) == 0)
    return true;
  if (strncmp (name, "__atomic_", 9) == 0)
    return true;
  return false;
}

/* Return true if NODE should be considered for inline expansion regardless
   of the optimization level.  This means whenever a function is invoked with
   its "internal" name, which normally contains the prefix "__builtin".  */

bool
called_as_built_in (tree node)
{
  /* Note that we must use DECL_NAME, not DECL_ASSEMBLER_NAME_SET_P since
     we want the name used to call the function, not the name it
     will have. */
  const char *name = IDENTIFIER_POINTER (DECL_NAME (node));
  return is_builtin_name (name);
}

/* Compute values M and N such that M divides (address of EXP - N) and such
   that N < M.  If these numbers can be determined, store M in alignp and N in
   *BITPOSP and return true.  Otherwise return false and store BITS_PER_UNIT to
   *alignp and any bit-offset to *bitposp.

   Note that the address (and thus the alignment) computed here is based
   on the address to which a symbol resolves, whereas DECL_ALIGN is based
   on the address at which an object is actually located.  These two
   addresses are not always the same.  For example, on ARM targets,
   the address &foo of a Thumb function foo() has the lowest bit set,
   whereas foo() itself starts on an even address.

   If ADDR_P is true we are taking the address of the memory reference EXP
   and thus cannot rely on the access taking place.  */

static bool
get_object_alignment_2 (tree exp, unsigned int *alignp,
			unsigned HOST_WIDE_INT *bitposp, bool addr_p)
{
  poly_int64 bitsize, bitpos;
  tree offset;
  machine_mode mode;
  int unsignedp, reversep, volatilep;
  unsigned int align = BITS_PER_UNIT;
  bool known_alignment = false;

  /* Get the innermost object and the constant (bitpos) and possibly
     variable (offset) offset of the access.  */
  exp = get_inner_reference (exp, &bitsize, &bitpos, &offset, &mode,
			     &unsignedp, &reversep, &volatilep);

  /* Extract alignment information from the innermost object and
     possibly adjust bitpos and offset.  */
  if (TREE_CODE (exp) == FUNCTION_DECL)
    {
      /* Function addresses can encode extra information besides their
	 alignment.  However, if TARGET_PTRMEMFUNC_VBIT_LOCATION
	 allows the low bit to be used as a virtual bit, we know
	 that the address itself must be at least 2-byte aligned.  */
      if (TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn)
	align = 2 * BITS_PER_UNIT;
    }
  else if (TREE_CODE (exp) == LABEL_DECL)
    ;
  else if (TREE_CODE (exp) == CONST_DECL)
    {
      /* The alignment of a CONST_DECL is determined by its initializer.  */
      exp = DECL_INITIAL (exp);
      align = TYPE_ALIGN (TREE_TYPE (exp));
      if (CONSTANT_CLASS_P (exp))
	align = targetm.constant_alignment (exp, align);

      known_alignment = true;
    }
  else if (DECL_P (exp))
    {
      align = DECL_ALIGN (exp);
      known_alignment = true;
    }
  else if (TREE_CODE (exp) == INDIRECT_REF
	   || TREE_CODE (exp) == MEM_REF
	   || TREE_CODE (exp) == TARGET_MEM_REF)
    {
      tree addr = TREE_OPERAND (exp, 0);
      unsigned ptr_align;
      unsigned HOST_WIDE_INT ptr_bitpos;
      unsigned HOST_WIDE_INT ptr_bitmask = ~0;

      /* If the address is explicitely aligned, handle that.  */
      if (TREE_CODE (addr) == BIT_AND_EXPR
	  && TREE_CODE (TREE_OPERAND (addr, 1)) == INTEGER_CST)
	{
	  ptr_bitmask = TREE_INT_CST_LOW (TREE_OPERAND (addr, 1));
	  ptr_bitmask *= BITS_PER_UNIT;
	  align = least_bit_hwi (ptr_bitmask);
	  addr = TREE_OPERAND (addr, 0);
	}

      known_alignment
	= get_pointer_alignment_1 (addr, &ptr_align, &ptr_bitpos);
      align = MAX (ptr_align, align);

      /* Re-apply explicit alignment to the bitpos.  */
      ptr_bitpos &= ptr_bitmask;

      /* The alignment of the pointer operand in a TARGET_MEM_REF
	 has to take the variable offset parts into account.  */
      if (TREE_CODE (exp) == TARGET_MEM_REF)
	{
	  if (TMR_INDEX (exp))
	    {
	      unsigned HOST_WIDE_INT step = 1;
	      if (TMR_STEP (exp))
		step = TREE_INT_CST_LOW (TMR_STEP (exp));
	      align = MIN (align, least_bit_hwi (step) * BITS_PER_UNIT);
	    }
	  if (TMR_INDEX2 (exp))
	    align = BITS_PER_UNIT;
	  known_alignment = false;
	}

      /* When EXP is an actual memory reference then we can use
	 TYPE_ALIGN of a pointer indirection to derive alignment.
	 Do so only if get_pointer_alignment_1 did not reveal absolute
	 alignment knowledge and if using that alignment would
	 improve the situation.  */
      unsigned int talign;
      if (!addr_p && !known_alignment
	  && (talign = min_align_of_type (TREE_TYPE (exp)) * BITS_PER_UNIT)
	  && talign > align)
	align = talign;
      else
	{
	  /* Else adjust bitpos accordingly.  */
	  bitpos += ptr_bitpos;
	  if (TREE_CODE (exp) == MEM_REF
	      || TREE_CODE (exp) == TARGET_MEM_REF)
	    bitpos += mem_ref_offset (exp).force_shwi () * BITS_PER_UNIT;
	}
    }
  else if (TREE_CODE (exp) == STRING_CST)
    {
      /* STRING_CST are the only constant objects we allow to be not
         wrapped inside a CONST_DECL.  */
      align = TYPE_ALIGN (TREE_TYPE (exp));
      if (CONSTANT_CLASS_P (exp))
	align = targetm.constant_alignment (exp, align);

      known_alignment = true;
    }

  /* If there is a non-constant offset part extract the maximum
     alignment that can prevail.  */
  if (offset)
    {
      unsigned int trailing_zeros = tree_ctz (offset);
      if (trailing_zeros < HOST_BITS_PER_INT)
	{
	  unsigned int inner = (1U << trailing_zeros) * BITS_PER_UNIT;
	  if (inner)
	    align = MIN (align, inner);
	}
    }

  /* Account for the alignment of runtime coefficients, so that the constant
     bitpos is guaranteed to be accurate.  */
  unsigned int alt_align = ::known_alignment (bitpos - bitpos.coeffs[0]);
  if (alt_align != 0 && alt_align < align)
    {
      align = alt_align;
      known_alignment = false;
    }

  *alignp = align;
  *bitposp = bitpos.coeffs[0] & (align - 1);
  return known_alignment;
}

/* For a memory reference expression EXP compute values M and N such that M
   divides (&EXP - N) and such that N < M.  If these numbers can be determined,
   store M in alignp and N in *BITPOSP and return true.  Otherwise return false
   and store BITS_PER_UNIT to *alignp and any bit-offset to *bitposp.  */

bool
get_object_alignment_1 (tree exp, unsigned int *alignp,
			unsigned HOST_WIDE_INT *bitposp)
{
  return get_object_alignment_2 (exp, alignp, bitposp, false);
}

/* Return the alignment in bits of EXP, an object.  */

unsigned int
get_object_alignment (tree exp)
{
  unsigned HOST_WIDE_INT bitpos = 0;
  unsigned int align;

  get_object_alignment_1 (exp, &align, &bitpos);

  /* align and bitpos now specify known low bits of the pointer.
     ptr & (align - 1) == bitpos.  */

  if (bitpos != 0)
    align = least_bit_hwi (bitpos);
  return align;
}

/* For a pointer valued expression EXP compute values M and N such that M
   divides (EXP - N) and such that N < M.  If these numbers can be determined,
   store M in alignp and N in *BITPOSP and return true.  Return false if
   the results are just a conservative approximation.

   If EXP is not a pointer, false is returned too.  */

bool
get_pointer_alignment_1 (tree exp, unsigned int *alignp,
			 unsigned HOST_WIDE_INT *bitposp)
{
  STRIP_NOPS (exp);

  if (TREE_CODE (exp) == ADDR_EXPR)
    return get_object_alignment_2 (TREE_OPERAND (exp, 0),
				   alignp, bitposp, true);
  else if (TREE_CODE (exp) == POINTER_PLUS_EXPR)
    {
      unsigned int align;
      unsigned HOST_WIDE_INT bitpos;
      bool res = get_pointer_alignment_1 (TREE_OPERAND (exp, 0),
					  &align, &bitpos);
      if (TREE_CODE (TREE_OPERAND (exp, 1)) == INTEGER_CST)
	bitpos += TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)) * BITS_PER_UNIT;
      else
	{
	  unsigned int trailing_zeros = tree_ctz (TREE_OPERAND (exp, 1));
	  if (trailing_zeros < HOST_BITS_PER_INT)
	    {
	      unsigned int inner = (1U << trailing_zeros) * BITS_PER_UNIT;
	      if (inner)
		align = MIN (align, inner);
	    }
	}
      *alignp = align;
      *bitposp = bitpos & (align - 1);
      return res;
    }
  else if (TREE_CODE (exp) == SSA_NAME
	   && POINTER_TYPE_P (TREE_TYPE (exp)))
    {
      unsigned int ptr_align, ptr_misalign;
      struct ptr_info_def *pi = SSA_NAME_PTR_INFO (exp);

      if (pi && get_ptr_info_alignment (pi, &ptr_align, &ptr_misalign))
	{
	  *bitposp = ptr_misalign * BITS_PER_UNIT;
	  *alignp = ptr_align * BITS_PER_UNIT;
	  /* Make sure to return a sensible alignment when the multiplication
	     by BITS_PER_UNIT overflowed.  */
	  if (*alignp == 0)
	    *alignp = 1u << (HOST_BITS_PER_INT - 1);
	  /* We cannot really tell whether this result is an approximation.  */
	  return false;
	}
      else
	{
	  *bitposp = 0;
	  *alignp = BITS_PER_UNIT;
	  return false;
	}
    }
  else if (TREE_CODE (exp) == INTEGER_CST)
    {
      *alignp = BIGGEST_ALIGNMENT;
      *bitposp = ((TREE_INT_CST_LOW (exp) * BITS_PER_UNIT)
		  & (BIGGEST_ALIGNMENT - 1));
      return true;
    }

  *bitposp = 0;
  *alignp = BITS_PER_UNIT;
  return false;
}

/* Return the alignment in bits of EXP, a pointer valued expression.
   The alignment returned is, by default, the alignment of the thing that
   EXP points to.  If it is not a POINTER_TYPE, 0 is returned.

   Otherwise, look at the expression to see if we can do better, i.e., if the
   expression is actually pointing at an object whose alignment is tighter.  */

unsigned int
get_pointer_alignment (tree exp)
{
  unsigned HOST_WIDE_INT bitpos = 0;
  unsigned int align;

  get_pointer_alignment_1 (exp, &align, &bitpos);

  /* align and bitpos now specify known low bits of the pointer.
     ptr & (align - 1) == bitpos.  */

  if (bitpos != 0)
    align = least_bit_hwi (bitpos);

  return align;
}

/* Return the number of leading non-zero elements in the sequence
   [ PTR, PTR + MAXELTS ) where each element's size is ELTSIZE bytes.
   ELTSIZE must be a power of 2 less than 8.  Used by c_strlen.  */

unsigned
string_length (const void *ptr, unsigned eltsize, unsigned maxelts)
{
  gcc_checking_assert (eltsize == 1 || eltsize == 2 || eltsize == 4);

  unsigned n;

  if (eltsize == 1)
    {
      /* Optimize the common case of plain char.  */
      for (n = 0; n < maxelts; n++)
	{
	  const char *elt = (const char*) ptr + n;
	  if (!*elt)
	    break;
	}
    }
  else
    {
      for (n = 0; n < maxelts; n++)
	{
	  const char *elt = (const char*) ptr + n * eltsize;
	  if (!memcmp (elt, "\0\0\0\0", eltsize))
	    break;
	}
    }
  return n;
}

/* For a call EXPR at LOC to a function FNAME that expects a string
   in the argument ARG, issue a diagnostic due to it being a called
   with an argument that is a character array with no terminating
   NUL.  SIZE is the EXACT size of the array, and BNDRNG the number
   of characters in which the NUL is expected.  Either EXPR or FNAME
   may be null but noth both.  SIZE may be null when BNDRNG is null.  */

void
warn_string_no_nul (location_t loc, tree expr, const char *fname,
		    tree arg, tree decl, tree size /* = NULL_TREE */,
		    bool exact /* = false */,
		    const wide_int bndrng[2] /* = NULL */)
{
  if ((expr && TREE_NO_WARNING (expr)) || TREE_NO_WARNING (arg))
    return;

  loc = expansion_point_location_if_in_system_header (loc);
  bool warned;

  /* Format the bound range as a string to keep the nuber of messages
     from exploding.  */
  char bndstr[80];
  *bndstr = 0;
  if (bndrng)
    {
      if (bndrng[0] == bndrng[1])
	sprintf (bndstr, "%llu", (unsigned long long) bndrng[0].to_uhwi ());
      else
	sprintf (bndstr, "[%llu, %llu]",
		 (unsigned long long) bndrng[0].to_uhwi (),
		 (unsigned long long) bndrng[1].to_uhwi ());
    }

  const tree maxobjsize = max_object_size ();
  const wide_int maxsiz = wi::to_wide (maxobjsize);
  if (expr)
    {
      tree func = get_callee_fndecl (expr);
      if (bndrng)
	{
	  if (wi::ltu_p (maxsiz, bndrng[0]))
	    warned = warning_at (loc, OPT_Wstringop_overread,
				 "%K%qD specified bound %s exceeds "
				 "maximum object size %E",
				 expr, func, bndstr, maxobjsize);
	  else
	    {
	      bool maybe = wi::to_wide (size) == bndrng[0];
	      warned = warning_at (loc, OPT_Wstringop_overread,
				   exact
				   ? G_("%K%qD specified bound %s exceeds "
					"the size %E of unterminated array")
				   : (maybe
				      ? G_("%K%qD specified bound %s may "
					   "exceed the size of at most %E "
					   "of unterminated array")
				      : G_("%K%qD specified bound %s exceeds "
					   "the size of at most %E "
					   "of unterminated array")),
				   expr, func, bndstr, size);
	    }
	}
      else
	warned = warning_at (loc, OPT_Wstringop_overread,
			     "%K%qD argument missing terminating nul",
			     expr, func);
    }
  else
    {
      if (bndrng)
	{
	  if (wi::ltu_p (maxsiz, bndrng[0]))
	    warned = warning_at (loc, OPT_Wstringop_overread,
				 "%qs specified bound %s exceeds "
				 "maximum object size %E",
				 fname, bndstr, maxobjsize);
	  else
	    {
	      bool maybe = wi::to_wide (size) == bndrng[0];
	      warned = warning_at (loc, OPT_Wstringop_overread,
				   exact
				   ? G_("%qs specified bound %s exceeds "
					"the size %E of unterminated array")
				   : (maybe
				      ? G_("%qs specified bound %s may "
					   "exceed the size of at most %E "
					   "of unterminated array")
				      : G_("%qs specified bound %s exceeds "
					   "the size of at most %E "
					   "of unterminated array")),
				   fname, bndstr, size);
	    }
	}
      else
	warned = warning_at (loc, OPT_Wstringop_overread,
			     "%qs argument missing terminating nul",
			     fname);
    }

  if (warned)
    {
      inform (DECL_SOURCE_LOCATION (decl),
	      "referenced argument declared here");
      TREE_NO_WARNING (arg) = 1;
      if (expr)
	TREE_NO_WARNING (expr) = 1;
    }
}

/* For a call EXPR (which may be null) that expects a string argument
   SRC as an argument, returns false if SRC is a character array with
   no terminating NUL.  When nonnull, BOUND is the number of characters
   in which to expect the terminating NUL.  RDONLY is true for read-only
   accesses such as strcmp, false for read-write such as strcpy.  When
   EXPR is also issues a warning.  */

bool
check_nul_terminated_array (tree expr, tree src,
			    tree bound /* = NULL_TREE */)
{
  /* The constant size of the array SRC points to.  The actual size
     may be less of EXACT is true, but not more.  */
  tree size;
  /* True if SRC involves a non-constant offset into the array.  */
  bool exact;
  /* The unterminated constant array SRC points to.  */
  tree nonstr = unterminated_array (src, &size, &exact);
  if (!nonstr)
    return true;

  /* NONSTR refers to the non-nul terminated constant array and SIZE
     is the constant size of the array in bytes.  EXACT is true when
     SIZE is exact.  */

  wide_int bndrng[2];
  if (bound)
    {
      if (TREE_CODE (bound) == INTEGER_CST)
	bndrng[0] = bndrng[1] = wi::to_wide (bound);
      else
	{
	  value_range_kind rng = get_range_info (bound, bndrng, bndrng + 1);
	  if (rng != VR_RANGE)
	    return true;
	}

      if (exact)
	{
	  if (wi::leu_p (bndrng[0], wi::to_wide (size)))
	    return true;
	}
      else if (wi::lt_p (bndrng[0], wi::to_wide (size), UNSIGNED))
	return true;
    }

  if (expr)
    warn_string_no_nul (EXPR_LOCATION (expr), expr, NULL, src, nonstr,
			size, exact, bound ? bndrng : NULL);

  return false;
}

/* If EXP refers to an unterminated constant character array return
   the declaration of the object of which the array is a member or
   element and if SIZE is not null, set *SIZE to the size of
   the unterminated array and set *EXACT if the size is exact or
   clear it otherwise.  Otherwise return null.  */

tree
unterminated_array (tree exp, tree *size /* = NULL */, bool *exact /* = NULL */)
{
  /* C_STRLEN will return NULL and set DECL in the info
     structure if EXP references a unterminated array.  */
  c_strlen_data lendata = { };
  tree len = c_strlen (exp, 1, &lendata);
  if (len == NULL_TREE && lendata.minlen && lendata.decl)
     {
       if (size)
	{
	  len = lendata.minlen;
	  if (lendata.off)
	    {
	      /* Constant offsets are already accounted for in LENDATA.MINLEN,
		 but not in a SSA_NAME + CST expression.  */
	      if (TREE_CODE (lendata.off) == INTEGER_CST)
		*exact = true;
	      else if (TREE_CODE (lendata.off) == PLUS_EXPR
		       && TREE_CODE (TREE_OPERAND (lendata.off, 1)) == INTEGER_CST)
		{
		  /* Subtract the offset from the size of the array.  */
		  *exact = false;
		  tree temp = TREE_OPERAND (lendata.off, 1);
		  temp = fold_convert (ssizetype, temp);
		  len = fold_build2 (MINUS_EXPR, ssizetype, len, temp);
		}
	      else
		*exact = false;
	    }
	  else
	    *exact = true;

	  *size = len;
	}
       return lendata.decl;
     }

  return NULL_TREE;
}

/* Compute the length of a null-terminated character string or wide
   character string handling character sizes of 1, 2, and 4 bytes.
   TREE_STRING_LENGTH is not the right way because it evaluates to
   the size of the character array in bytes (as opposed to characters)
   and because it can contain a zero byte in the middle.

   ONLY_VALUE should be nonzero if the result is not going to be emitted
   into the instruction stream and zero if it is going to be expanded.
   E.g. with i++ ? "foo" : "bar", if ONLY_VALUE is nonzero, constant 3
   is returned, otherwise NULL, since
   len = c_strlen (ARG, 1); if (len) expand_expr (len, ...); would not
   evaluate the side-effects.

   If ONLY_VALUE is two then we do not emit warnings about out-of-bound
   accesses.  Note that this implies the result is not going to be emitted
   into the instruction stream.

   Additional information about the string accessed may be recorded
   in DATA.  For example, if ARG references an unterminated string,
   then the declaration will be stored in the DECL field.   If the
   length of the unterminated string can be determined, it'll be
   stored in the LEN field.  Note this length could well be different
   than what a C strlen call would return.

   ELTSIZE is 1 for normal single byte character strings, and 2 or
   4 for wide characer strings.  ELTSIZE is by default 1.

   The value returned is of type `ssizetype'.  */

tree
c_strlen (tree arg, int only_value, c_strlen_data *data, unsigned eltsize)
{
  /* If we were not passed a DATA pointer, then get one to a local
     structure.  That avoids having to check DATA for NULL before
     each time we want to use it.  */
  c_strlen_data local_strlen_data = { };
  if (!data)
    data = &local_strlen_data;

  gcc_checking_assert (eltsize == 1 || eltsize == 2 || eltsize == 4);

  tree src = STRIP_NOPS (arg);
  if (TREE_CODE (src) == COND_EXPR
      && (only_value || !TREE_SIDE_EFFECTS (TREE_OPERAND (src, 0))))
    {
      tree len1, len2;

      len1 = c_strlen (TREE_OPERAND (src, 1), only_value, data, eltsize);
      len2 = c_strlen (TREE_OPERAND (src, 2), only_value, data, eltsize);
      if (tree_int_cst_equal (len1, len2))
	return len1;
    }

  if (TREE_CODE (src) == COMPOUND_EXPR
      && (only_value || !TREE_SIDE_EFFECTS (TREE_OPERAND (src, 0))))
    return c_strlen (TREE_OPERAND (src, 1), only_value, data, eltsize);

  location_t loc = EXPR_LOC_OR_LOC (src, input_location);

  /* Offset from the beginning of the string in bytes.  */
  tree byteoff;
  tree memsize;
  tree decl;
  src = string_constant (src, &byteoff, &memsize, &decl);
  if (src == 0)
    return NULL_TREE;

  /* Determine the size of the string element.  */
  if (eltsize != tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (src)))))
    return NULL_TREE;

  /* Set MAXELTS to sizeof (SRC) / sizeof (*SRC) - 1, the maximum possible
     length of SRC.  Prefer TYPE_SIZE() to TREE_STRING_LENGTH() if possible
     in case the latter is less than the size of the array, such as when
     SRC refers to a short string literal used to initialize a large array.
     In that case, the elements of the array after the terminating NUL are
     all NUL.  */
  HOST_WIDE_INT strelts = TREE_STRING_LENGTH (src);
  strelts = strelts / eltsize;

  if (!tree_fits_uhwi_p (memsize))
    return NULL_TREE;

  HOST_WIDE_INT maxelts = tree_to_uhwi (memsize) / eltsize;

  /* PTR can point to the byte representation of any string type, including
     char* and wchar_t*.  */
  const char *ptr = TREE_STRING_POINTER (src);

  if (byteoff && TREE_CODE (byteoff) != INTEGER_CST)
    {
      /* The code below works only for single byte character types.  */
      if (eltsize != 1)
	return NULL_TREE;

      /* If the string has an internal NUL character followed by any
	 non-NUL characters (e.g., "foo\0bar"), we can't compute
	 the offset to the following NUL if we don't know where to
	 start searching for it.  */
      unsigned len = string_length (ptr, eltsize, strelts);

      /* Return when an embedded null character is found or none at all.
	 In the latter case, set the DECL/LEN field in the DATA structure
	 so that callers may examine them.  */
      if (len + 1 < strelts)
	return NULL_TREE;
      else if (len >= maxelts)
	{
	  data->decl = decl;
	  data->off = byteoff;
	  data->minlen = ssize_int (len);
	  return NULL_TREE;
	}

      /* For empty strings the result should be zero.  */
      if (len == 0)
	return ssize_int (0);

      /* We don't know the starting offset, but we do know that the string
	 has no internal zero bytes.  If the offset falls within the bounds
	 of the string subtract the offset from the length of the string,
	 and return that.  Otherwise the length is zero.  Take care to
	 use SAVE_EXPR in case the OFFSET has side-effects.  */
      tree offsave = TREE_SIDE_EFFECTS (byteoff) ? save_expr (byteoff)
						 : byteoff;
      offsave = fold_convert_loc (loc, sizetype, offsave);
      tree condexp = fold_build2_loc (loc, LE_EXPR, boolean_type_node, offsave,
				      size_int (len));
      tree lenexp = fold_build2_loc (loc, MINUS_EXPR, sizetype, size_int (len),
				     offsave);
      lenexp = fold_convert_loc (loc, ssizetype, lenexp);
      return fold_build3_loc (loc, COND_EXPR, ssizetype, condexp, lenexp,
			      build_zero_cst (ssizetype));
    }

  /* Offset from the beginning of the string in elements.  */
  HOST_WIDE_INT eltoff;

  /* We have a known offset into the string.  Start searching there for
     a null character if we can represent it as a single HOST_WIDE_INT.  */
  if (byteoff == 0)
    eltoff = 0;
  else if (! tree_fits_uhwi_p (byteoff) || tree_to_uhwi (byteoff) % eltsize)
    eltoff = -1;
  else
    eltoff = tree_to_uhwi (byteoff) / eltsize;

  /* If the offset is known to be out of bounds, warn, and call strlen at
     runtime.  */
  if (eltoff < 0 || eltoff >= maxelts)
    {
      /* Suppress multiple warnings for propagated constant strings.  */
      if (only_value != 2
	  && !TREE_NO_WARNING (arg)
	  && warning_at (loc, OPT_Warray_bounds,
			 "offset %qwi outside bounds of constant string",
			 eltoff))
	{
	  if (decl)
	    inform (DECL_SOURCE_LOCATION (decl), "%qE declared here", decl);
	  TREE_NO_WARNING (arg) = 1;
	}
      return NULL_TREE;
    }

  /* If eltoff is larger than strelts but less than maxelts the
     string length is zero, since the excess memory will be zero.  */
  if (eltoff > strelts)
    return ssize_int (0);

  /* Use strlen to search for the first zero byte.  Since any strings
     constructed with build_string will have nulls appended, we win even
     if we get handed something like (char[4])"abcd".

     Since ELTOFF is our starting index into the string, no further
     calculation is needed.  */
  unsigned len = string_length (ptr + eltoff * eltsize, eltsize,
				strelts - eltoff);

  /* Don't know what to return if there was no zero termination.
     Ideally this would turn into a gcc_checking_assert over time.
     Set DECL/LEN so callers can examine them.  */
  if (len >= maxelts - eltoff)
    {
      data->decl = decl;
      data->off = byteoff;
      data->minlen = ssize_int (len);
      return NULL_TREE;
    }

  return ssize_int (len);
}

/* Return a constant integer corresponding to target reading
   GET_MODE_BITSIZE (MODE) bits from string constant STR.  If
   NULL_TERMINATED_P, reading stops after '\0' character, all further ones
   are assumed to be zero, otherwise it reads as many characters
   as needed.  */

rtx
c_readstr (const char *str, scalar_int_mode mode,
	   bool null_terminated_p/*=true*/)
{
  HOST_WIDE_INT ch;
  unsigned int i, j;
  HOST_WIDE_INT tmp[MAX_BITSIZE_MODE_ANY_INT / HOST_BITS_PER_WIDE_INT];

  gcc_assert (GET_MODE_CLASS (mode) == MODE_INT);
  unsigned int len = (GET_MODE_PRECISION (mode) + HOST_BITS_PER_WIDE_INT - 1)
    / HOST_BITS_PER_WIDE_INT;

  gcc_assert (len <= MAX_BITSIZE_MODE_ANY_INT / HOST_BITS_PER_WIDE_INT);
  for (i = 0; i < len; i++)
    tmp[i] = 0;

  ch = 1;
  for (i = 0; i < GET_MODE_SIZE (mode); i++)
    {
      j = i;
      if (WORDS_BIG_ENDIAN)
	j = GET_MODE_SIZE (mode) - i - 1;
      if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
	  && GET_MODE_SIZE (mode) >= UNITS_PER_WORD)
	j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
      j *= BITS_PER_UNIT;

      if (ch || !null_terminated_p)
	ch = (unsigned char) str[i];
      tmp[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
    }

  wide_int c = wide_int::from_array (tmp, len, GET_MODE_PRECISION (mode));
  return immed_wide_int_const (c, mode);
}

/* Cast a target constant CST to target CHAR and if that value fits into
   host char type, return zero and put that value into variable pointed to by
   P.  */

static int
target_char_cast (tree cst, char *p)
{
  unsigned HOST_WIDE_INT val, hostval;

  if (TREE_CODE (cst) != INTEGER_CST
      || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
    return 1;

  /* Do not care if it fits or not right here.  */
  val = TREE_INT_CST_LOW (cst);

  if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
    val &= (HOST_WIDE_INT_1U << CHAR_TYPE_SIZE) - 1;

  hostval = val;
  if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
    hostval &= (HOST_WIDE_INT_1U << HOST_BITS_PER_CHAR) - 1;

  if (val != hostval)
    return 1;

  *p = hostval;
  return 0;
}

/* Similar to save_expr, but assumes that arbitrary code is not executed
   in between the multiple evaluations.  In particular, we assume that a
   non-addressable local variable will not be modified.  */

static tree
builtin_save_expr (tree exp)
{
  if (TREE_CODE (exp) == SSA_NAME
      || (TREE_ADDRESSABLE (exp) == 0
	  && (TREE_CODE (exp) == PARM_DECL
	      || (VAR_P (exp) && !TREE_STATIC (exp)))))
    return exp;

  return save_expr (exp);
}

/* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
   times to get the address of either a higher stack frame, or a return
   address located within it (depending on FNDECL_CODE).  */

static rtx
expand_builtin_return_addr (enum built_in_function fndecl_code, int count)
{
  int i;
  rtx tem = INITIAL_FRAME_ADDRESS_RTX;
  if (tem == NULL_RTX)
    {
      /* For a zero count with __builtin_return_address, we don't care what
	 frame address we return, because target-specific definitions will
	 override us.  Therefore frame pointer elimination is OK, and using
	 the soft frame pointer is OK.

	 For a nonzero count, or a zero count with __builtin_frame_address,
	 we require a stable offset from the current frame pointer to the
	 previous one, so we must use the hard frame pointer, and
	 we must disable frame pointer elimination.  */
      if (count == 0 && fndecl_code == BUILT_IN_RETURN_ADDRESS)
	tem = frame_pointer_rtx;
      else
	{
	  tem = hard_frame_pointer_rtx;

	  /* Tell reload not to eliminate the frame pointer.  */
	  crtl->accesses_prior_frames = 1;
	}
    }

  if (count > 0)
    SETUP_FRAME_ADDRESSES ();

  /* On the SPARC, the return address is not in the frame, it is in a
     register.  There is no way to access it off of the current frame
     pointer, but it can be accessed off the previous frame pointer by
     reading the value from the register window save area.  */
  if (RETURN_ADDR_IN_PREVIOUS_FRAME && fndecl_code == BUILT_IN_RETURN_ADDRESS)
    count--;

  /* Scan back COUNT frames to the specified frame.  */
  for (i = 0; i < count; i++)
    {
      /* Assume the dynamic chain pointer is in the word that the
	 frame address points to, unless otherwise specified.  */
      tem = DYNAMIC_CHAIN_ADDRESS (tem);
      tem = memory_address (Pmode, tem);
      tem = gen_frame_mem (Pmode, tem);
      tem = copy_to_reg (tem);
    }

  /* For __builtin_frame_address, return what we've got.  But, on
     the SPARC for example, we may have to add a bias.  */
  if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
    return FRAME_ADDR_RTX (tem);

  /* For __builtin_return_address, get the return address from that frame.  */
#ifdef RETURN_ADDR_RTX
  tem = RETURN_ADDR_RTX (count, tem);
#else
  tem = memory_address (Pmode,
			plus_constant (Pmode, tem, GET_MODE_SIZE (Pmode)));
  tem = gen_frame_mem (Pmode, tem);
#endif
  return tem;
}

/* Alias set used for setjmp buffer.  */
static alias_set_type setjmp_alias_set = -1;

/* Construct the leading half of a __builtin_setjmp call.  Control will
   return to RECEIVER_LABEL.  This is also called directly by the SJLJ
   exception handling code.  */

void
expand_builtin_setjmp_setup (rtx buf_addr, rtx receiver_label)
{
  machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
  rtx stack_save;
  rtx mem;

  if (setjmp_alias_set == -1)
    setjmp_alias_set = new_alias_set ();

  buf_addr = convert_memory_address (Pmode, buf_addr);

  buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));

  /* We store the frame pointer and the address of receiver_label in
     the buffer and use the rest of it for the stack save area, which
     is machine-dependent.  */

  mem = gen_rtx_MEM (Pmode, buf_addr);
  set_mem_alias_set (mem, setjmp_alias_set);
  emit_move_insn (mem, hard_frame_pointer_rtx);

  mem = gen_rtx_MEM (Pmode, plus_constant (Pmode, buf_addr,
					   GET_MODE_SIZE (Pmode))),
  set_mem_alias_set (mem, setjmp_alias_set);

  emit_move_insn (validize_mem (mem),
		  force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));

  stack_save = gen_rtx_MEM (sa_mode,
			    plus_constant (Pmode, buf_addr,
					   2 * GET_MODE_SIZE (Pmode)));
  set_mem_alias_set (stack_save, setjmp_alias_set);
  emit_stack_save (SAVE_NONLOCAL, &stack_save);

  /* If there is further processing to do, do it.  */
  if (targetm.have_builtin_setjmp_setup ())
    emit_insn (targetm.gen_builtin_setjmp_setup (buf_addr));

  /* We have a nonlocal label.   */
  cfun->has_nonlocal_label = 1;
}

/* Construct the trailing part of a __builtin_setjmp call.  This is
   also called directly by the SJLJ exception handling code.
   If RECEIVER_LABEL is NULL, instead contruct a nonlocal goto handler.  */

void
expand_builtin_setjmp_receiver (rtx receiver_label)
{
  rtx chain;

  /* Mark the FP as used when we get here, so we have to make sure it's
     marked as used by this function.  */
  emit_use (hard_frame_pointer_rtx);

  /* Mark the static chain as clobbered here so life information
     doesn't get messed up for it.  */
  chain = rtx_for_static_chain (current_function_decl, true);
  if (chain && REG_P (chain))
    emit_clobber (chain);

  if (!HARD_FRAME_POINTER_IS_ARG_POINTER && fixed_regs[ARG_POINTER_REGNUM])
    {
      /* If the argument pointer can be eliminated in favor of the
	 frame pointer, we don't need to restore it.  We assume here
	 that if such an elimination is present, it can always be used.
	 This is the case on all known machines; if we don't make this
	 assumption, we do unnecessary saving on many machines.  */
      size_t i;
      static const struct elims {const int from, to;} elim_regs[] = ELIMINABLE_REGS;

      for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
	if (elim_regs[i].from == ARG_POINTER_REGNUM
	    && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
	  break;

      if (i == ARRAY_SIZE (elim_regs))
	{
	  /* Now restore our arg pointer from the address at which it
	     was saved in our stack frame.  */
	  emit_move_insn (crtl->args.internal_arg_pointer,
			  copy_to_reg (get_arg_pointer_save_area ()));
	}
    }

  if (receiver_label != NULL && targetm.have_builtin_setjmp_receiver ())
    emit_insn (targetm.gen_builtin_setjmp_receiver (receiver_label));
  else if (targetm.have_nonlocal_goto_receiver ())
    emit_insn (targetm.gen_nonlocal_goto_receiver ());
  else
    { /* Nothing */ }

  /* We must not allow the code we just generated to be reordered by
     scheduling.  Specifically, the update of the frame pointer must
     happen immediately, not later.  */
  emit_insn (gen_blockage ());
}

/* __builtin_longjmp is passed a pointer to an array of five words (not
   all will be used on all machines).  It operates similarly to the C
   library function of the same name, but is more efficient.  Much of
   the code below is copied from the handling of non-local gotos.  */

static void
expand_builtin_longjmp (rtx buf_addr, rtx value)
{
  rtx fp, lab, stack;
  rtx_insn *insn, *last;
  machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);

  /* DRAP is needed for stack realign if longjmp is expanded to current
     function  */
  if (SUPPORTS_STACK_ALIGNMENT)
    crtl->need_drap = true;

  if (setjmp_alias_set == -1)
    setjmp_alias_set = new_alias_set ();

  buf_addr = convert_memory_address (Pmode, buf_addr);

  buf_addr = force_reg (Pmode, buf_addr);

  /* We require that the user must pass a second argument of 1, because
     that is what builtin_setjmp will return.  */
  gcc_assert (value == const1_rtx);

  last = get_last_insn ();
  if (targetm.have_builtin_longjmp ())
    emit_insn (targetm.gen_builtin_longjmp (buf_addr));
  else
    {
      fp = gen_rtx_MEM (Pmode, buf_addr);
      lab = gen_rtx_MEM (Pmode, plus_constant (Pmode, buf_addr,
					       GET_MODE_SIZE (Pmode)));

      stack = gen_rtx_MEM (sa_mode, plus_constant (Pmode, buf_addr,
						   2 * GET_MODE_SIZE (Pmode)));
      set_mem_alias_set (fp, setjmp_alias_set);
      set_mem_alias_set (lab, setjmp_alias_set);
      set_mem_alias_set (stack, setjmp_alias_set);

      /* Pick up FP, label, and SP from the block and jump.  This code is
	 from expand_goto in stmt.c; see there for detailed comments.  */
      if (targetm.have_nonlocal_goto ())
	/* We have to pass a value to the nonlocal_goto pattern that will
	   get copied into the static_chain pointer, but it does not matter
	   what that value is, because builtin_setjmp does not use it.  */
	emit_insn (targetm.gen_nonlocal_goto (value, lab, stack, fp));
      else
	{
	  emit_clobber (gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (VOIDmode)));
	  emit_clobber (gen_rtx_MEM (BLKmode, hard_frame_pointer_rtx));

	  lab = copy_to_reg (lab);

	  /* Restore the frame pointer and stack pointer.  We must use a
	     temporary since the setjmp buffer may be a local.  */
	  fp = copy_to_reg (fp);
	  emit_stack_restore (SAVE_NONLOCAL, stack);

	  /* Ensure the frame pointer move is not optimized.  */
	  emit_insn (gen_blockage ());
	  emit_clobber (hard_frame_pointer_rtx);
	  emit_clobber (frame_pointer_rtx);
	  emit_move_insn (hard_frame_pointer_rtx, fp);

	  emit_use (hard_frame_pointer_rtx);
	  emit_use (stack_pointer_rtx);
	  emit_indirect_jump (lab);
	}
    }

  /* Search backwards and mark the jump insn as a non-local goto.
     Note that this precludes the use of __builtin_longjmp to a
     __builtin_setjmp target in the same function.  However, we've
     already cautioned the user that these functions are for
     internal exception handling use only.  */
  for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
    {
      gcc_assert (insn != last);

      if (JUMP_P (insn))
	{
	  add_reg_note (insn, REG_NON_LOCAL_GOTO, const0_rtx);
	  break;
	}
      else if (CALL_P (insn))
	break;
    }
}

static inline bool
more_const_call_expr_args_p (const const_call_expr_arg_iterator *iter)
{
  return (iter->i < iter->n);
}

/* This function validates the types of a function call argument list
   against a specified list of tree_codes.  If the last specifier is a 0,
   that represents an ellipsis, otherwise the last specifier must be a
   VOID_TYPE.  */

static bool
validate_arglist (const_tree callexpr, ...)
{
  enum tree_code code;
  bool res = 0;
  va_list ap;
  const_call_expr_arg_iterator iter;
  const_tree arg;

  va_start (ap, callexpr);
  init_const_call_expr_arg_iterator (callexpr, &iter);

  /* Get a bitmap of pointer argument numbers declared attribute nonnull.  */
  tree fn = CALL_EXPR_FN (callexpr);
  bitmap argmap = get_nonnull_args (TREE_TYPE (TREE_TYPE (fn)));

  for (unsigned argno = 1; ; ++argno)
    {
      code = (enum tree_code) va_arg (ap, int);

      switch (code)
	{
	case 0:
	  /* This signifies an ellipses, any further arguments are all ok.  */
	  res = true;
	  goto end;
	case VOID_TYPE:
	  /* This signifies an endlink, if no arguments remain, return
	     true, otherwise return false.  */
	  res = !more_const_call_expr_args_p (&iter);
	  goto end;
	case POINTER_TYPE:
	  /* The actual argument must be nonnull when either the whole
	     called function has been declared nonnull, or when the formal
	     argument corresponding to the actual argument has been.  */
	  if (argmap
	      && (bitmap_empty_p (argmap) || bitmap_bit_p (argmap, argno)))
	    {
	      arg = next_const_call_expr_arg (&iter);
	      if (!validate_arg (arg, code) || integer_zerop (arg))
		goto end;
	      break;
	    }
	  /* FALLTHRU */
	default:
	  /* If no parameters remain or the parameter's code does not
	     match the specified code, return false.  Otherwise continue
	     checking any remaining arguments.  */
	  arg = next_const_call_expr_arg (&iter);
	  if (!validate_arg (arg, code))
	    goto end;
	  break;
	}
    }

  /* We need gotos here since we can only have one VA_CLOSE in a
     function.  */
 end: ;
  va_end (ap);

  BITMAP_FREE (argmap);

  return res;
}

/* Expand a call to __builtin_nonlocal_goto.  We're passed the target label
   and the address of the save area.  */

static rtx
expand_builtin_nonlocal_goto (tree exp)
{
  tree t_label, t_save_area;
  rtx r_label, r_save_area, r_fp, r_sp;
  rtx_insn *insn;

  if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
    return NULL_RTX;

  t_label = CALL_EXPR_ARG (exp, 0);
  t_save_area = CALL_EXPR_ARG (exp, 1);

  r_label = expand_normal (t_label);
  r_label = convert_memory_address (Pmode, r_label);
  r_save_area = expand_normal (t_save_area);
  r_save_area = convert_memory_address (Pmode, r_save_area);
  /* Copy the address of the save location to a register just in case it was
     based on the frame pointer.   */
  r_save_area = copy_to_reg (r_save_area);
  r_fp = gen_rtx_MEM (Pmode, r_save_area);
  r_sp = gen_rtx_MEM (STACK_SAVEAREA_MODE (SAVE_NONLOCAL),
		      plus_constant (Pmode, r_save_area,
				     GET_MODE_SIZE (Pmode)));

  crtl->has_nonlocal_goto = 1;

  /* ??? We no longer need to pass the static chain value, afaik.  */
  if (targetm.have_nonlocal_goto ())
    emit_insn (targetm.gen_nonlocal_goto (const0_rtx, r_label, r_sp, r_fp));
  else
    {
      emit_clobber (gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (VOIDmode)));
      emit_clobber (gen_rtx_MEM (BLKmode, hard_frame_pointer_rtx));

      r_label = copy_to_reg (r_label);

      /* Restore the frame pointer and stack pointer.  We must use a
	 temporary since the setjmp buffer may be a local.  */
      r_fp = copy_to_reg (r_fp);
      emit_stack_restore (SAVE_NONLOCAL, r_sp);

      /* Ensure the frame pointer move is not optimized.  */
      emit_insn (gen_blockage ());
      emit_clobber (hard_frame_pointer_rtx);
      emit_clobber (frame_pointer_rtx);
      emit_move_insn (hard_frame_pointer_rtx, r_fp);

      /* USE of hard_frame_pointer_rtx added for consistency;
	 not clear if really needed.  */
      emit_use (hard_frame_pointer_rtx);
      emit_use (stack_pointer_rtx);

      /* If the architecture is using a GP register, we must
	 conservatively assume that the target function makes use of it.
	 The prologue of functions with nonlocal gotos must therefore
	 initialize the GP register to the appropriate value, and we
	 must then make sure that this value is live at the point
	 of the jump.  (Note that this doesn't necessarily apply
	 to targets with a nonlocal_goto pattern; they are free
	 to implement it in their own way.  Note also that this is
	 a no-op if the GP register is a global invariant.)  */
      unsigned regnum = PIC_OFFSET_TABLE_REGNUM;
      if (regnum != INVALID_REGNUM && fixed_regs[regnum])
	emit_use (pic_offset_table_rtx);

      emit_indirect_jump (r_label);
    }

  /* Search backwards to the jump insn and mark it as a
     non-local goto.  */
  for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
    {
      if (JUMP_P (insn))
	{
	  add_reg_note (insn, REG_NON_LOCAL_GOTO, const0_rtx);
	  break;
	}
      else if (CALL_P (insn))
	break;
    }

  return const0_rtx;
}

/* __builtin_update_setjmp_buf is passed a pointer to an array of five words
   (not all will be used on all machines) that was passed to __builtin_setjmp.
   It updates the stack pointer in that block to the current value.  This is
   also called directly by the SJLJ exception handling code.  */

void
expand_builtin_update_setjmp_buf (rtx buf_addr)
{
  machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
  buf_addr = convert_memory_address (Pmode, buf_addr);
  rtx stack_save
    = gen_rtx_MEM (sa_mode,
		   memory_address
		   (sa_mode,
		    plus_constant (Pmode, buf_addr,
				   2 * GET_MODE_SIZE (Pmode))));

  emit_stack_save (SAVE_NONLOCAL, &stack_save);
}

/* Expand a call to __builtin_prefetch.  For a target that does not support
   data prefetch, evaluate the memory address argument in case it has side
   effects.  */

static void
expand_builtin_prefetch (tree exp)
{
  tree arg0, arg1, arg2;
  int nargs;
  rtx op0, op1, op2;

  if (!validate_arglist (exp, POINTER_TYPE, 0))
    return;

  arg0 = CALL_EXPR_ARG (exp, 0);

  /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
     zero (read) and argument 2 (locality) defaults to 3 (high degree of
     locality).  */
  nargs = call_expr_nargs (exp);
  if (nargs > 1)
    arg1 = CALL_EXPR_ARG (exp, 1);
  else
    arg1 = integer_zero_node;
  if (nargs > 2)
    arg2 = CALL_EXPR_ARG (exp, 2);
  else
    arg2 = integer_three_node;

  /* Argument 0 is an address.  */
  op0 = expand_expr (arg0, NULL_RTX, Pmode, EXPAND_NORMAL);

  /* Argument 1 (read/write flag) must be a compile-time constant int.  */
  if (TREE_CODE (arg1) != INTEGER_CST)
    {
      error ("second argument to %<__builtin_prefetch%> must be a constant");
      arg1 = integer_zero_node;
    }
  op1 = expand_normal (arg1);
  /* Argument 1 must be either zero or one.  */
  if (INTVAL (op1) != 0 && INTVAL (op1) != 1)
    {
      warning (0, "invalid second argument to %<__builtin_prefetch%>;"
	       " using zero");
      op1 = const0_rtx;
    }

  /* Argument 2 (locality) must be a compile-time constant int.  */
  if (TREE_CODE (arg2) != INTEGER_CST)
    {
      error ("third argument to %<__builtin_prefetch%> must be a constant");
      arg2 = integer_zero_node;
    }
  op2 = expand_normal (arg2);
  /* Argument 2 must be 0, 1, 2, or 3.  */
  if (INTVAL (op2) < 0 || INTVAL (op2) > 3)
    {
      warning (0, "invalid third argument to %<__builtin_prefetch%>; using zero");
      op2 = const0_rtx;
    }

  if (targetm.have_prefetch ())
    {
      class expand_operand ops[3];

      create_address_operand (&ops[0], op0);
      create_integer_operand (&ops[1], INTVAL (op1));
      create_integer_operand (&ops[2], INTVAL (op2));
      if (maybe_expand_insn (targetm.code_for_prefetch, 3, ops))
	return;
    }

  /* Don't do anything with direct references to volatile memory, but
     generate code to handle other side effects.  */
  if (!MEM_P (op0) && side_effects_p (op0))
    emit_insn (op0);
}

/* Get a MEM rtx for expression EXP which is the address of an operand
   to be used in a string instruction (cmpstrsi, cpymemsi, ..).  LEN is
   the maximum length of the block of memory that might be accessed or
   NULL if unknown.  */

static rtx
get_memory_rtx (tree exp, tree len)
{
  tree orig_exp = exp;
  rtx addr, mem;

  /* When EXP is not resolved SAVE_EXPR, MEM_ATTRS can be still derived
     from its expression, for expr->a.b only <variable>.a.b is recorded.  */
  if (TREE_CODE (exp) == SAVE_EXPR && !SAVE_EXPR_RESOLVED_P (exp))
    exp = TREE_OPERAND (exp, 0);

  addr = expand_expr (orig_exp, NULL_RTX, ptr_mode, EXPAND_NORMAL);
  mem = gen_rtx_MEM (BLKmode, memory_address (BLKmode, addr));

  /* Get an expression we can use to find the attributes to assign to MEM.
     First remove any nops.  */
  while (CONVERT_EXPR_P (exp)
	 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
    exp = TREE_OPERAND (exp, 0);

  /* Build a MEM_REF representing the whole accessed area as a byte blob,
     (as builtin stringops may alias with anything).  */
  exp = fold_build2 (MEM_REF,
		     build_array_type (char_type_node,
				       build_range_type (sizetype,
							 size_one_node, len)),
		     exp, build_int_cst (ptr_type_node, 0));

  /* If the MEM_REF has no acceptable address, try to get the base object
     from the original address we got, and build an all-aliasing
     unknown-sized access to that one.  */
  if (is_gimple_mem_ref_addr (TREE_OPERAND (exp, 0)))
    set_mem_attributes (mem, exp, 0);
  else if (TREE_CODE (TREE_OPERAND (exp, 0)) == ADDR_EXPR
	   && (exp = get_base_address (TREE_OPERAND (TREE_OPERAND (exp, 0),
						     0))))
    {
      exp = build_fold_addr_expr (exp);
      exp = fold_build2 (MEM_REF,
			 build_array_type (char_type_node,
					   build_range_type (sizetype,
							     size_zero_node,
							     NULL)),
			 exp, build_int_cst (ptr_type_node, 0));
      set_mem_attributes (mem, exp, 0);
    }
  set_mem_alias_set (mem, 0);
  return mem;
}

/* Built-in functions to perform an untyped call and return.  */

#define apply_args_mode \
  (this_target_builtins->x_apply_args_mode)
#define apply_result_mode \
  (this_target_builtins->x_apply_result_mode)

/* Return the size required for the block returned by __builtin_apply_args,
   and initialize apply_args_mode.  */

static int
apply_args_size (void)
{
  static int size = -1;
  int align;
  unsigned int regno;

  /* The values computed by this function never change.  */
  if (size < 0)
    {
      /* The first value is the incoming arg-pointer.  */
      size = GET_MODE_SIZE (Pmode);

      /* The second value is the structure value address unless this is
	 passed as an "invisible" first argument.  */
      if (targetm.calls.struct_value_rtx (cfun ? TREE_TYPE (cfun->decl) : 0, 0))
	size += GET_MODE_SIZE (Pmode);

      for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
	if (FUNCTION_ARG_REGNO_P (regno))
	  {
	    fixed_size_mode mode = targetm.calls.get_raw_arg_mode (regno);

	    gcc_assert (mode != VOIDmode);

	    align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
	    if (size % align != 0)
	      size = CEIL (size, align) * align;
	    size += GET_MODE_SIZE (mode);
	    apply_args_mode[regno] = mode;
	  }
	else
	  {
	    apply_args_mode[regno] = as_a <fixed_size_mode> (VOIDmode);
	  }
    }
  return size;
}

/* Return the size required for the block returned by __builtin_apply,
   and initialize apply_result_mode.  */

static int
apply_result_size (void)
{
  static int size = -1;
  int align, regno;

  /* The values computed by this function never change.  */
  if (size < 0)
    {
      size = 0;

      for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
	if (targetm.calls.function_value_regno_p (regno))
	  {
	    fixed_size_mode mode = targetm.calls.get_raw_result_mode (regno);

	    gcc_assert (mode != VOIDmode);

	    align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
	    if (size % align != 0)
	      size = CEIL (size, align) * align;
	    size += GET_MODE_SIZE (mode);
	    apply_result_mode[regno] = mode;
	  }
	else
	  apply_result_mode[regno] = as_a <fixed_size_mode> (VOIDmode);

      /* Allow targets that use untyped_call and untyped_return to override
	 the size so that machine-specific information can be stored here.  */
#ifdef APPLY_RESULT_SIZE
      size = APPLY_RESULT_SIZE;
#endif
    }
  return size;
}

/* Create a vector describing the result block RESULT.  If SAVEP is true,
   the result block is used to save the values; otherwise it is used to
   restore the values.  */

static rtx
result_vector (int savep, rtx result)
{
  int regno, size, align, nelts;
  fixed_size_mode mode;
  rtx reg, mem;
  rtx *savevec = XALLOCAVEC (rtx, FIRST_PSEUDO_REGISTER);

  size = nelts = 0;
  for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
    if ((mode = apply_result_mode[regno]) != VOIDmode)
      {
	align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
	if (size % align != 0)
	  size = CEIL (size, align) * align;
	reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
	mem = adjust_address (result, mode, size);
	savevec[nelts++] = (savep
			    ? gen_rtx_SET (mem, reg)
			    : gen_rtx_SET (reg, mem));
	size += GET_MODE_SIZE (mode);
      }
  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
}

/* Save the state required to perform an untyped call with the same
   arguments as were passed to the current function.  */

static rtx
expand_builtin_apply_args_1 (void)
{
  rtx registers, tem;
  int size, align, regno;
  fixed_size_mode mode;
  rtx struct_incoming_value = targetm.calls.struct_value_rtx (cfun ? TREE_TYPE (cfun->decl) : 0, 1);

  /* Create a block where the arg-pointer, structure value address,
     and argument registers can be saved.  */
  registers = assign_stack_local (BLKmode, apply_args_size (), -1);

  /* Walk past the arg-pointer and structure value address.  */
  size = GET_MODE_SIZE (Pmode);
  if (targetm.calls.struct_value_rtx (cfun ? TREE_TYPE (cfun->decl) : 0, 0))
    size += GET_MODE_SIZE (Pmode);

  /* Save each register used in calling a function to the block.  */
  for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
    if ((mode = apply_args_mode[regno]) != VOIDmode)
      {
	align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
	if (size % align != 0)
	  size = CEIL (size, align) * align;

	tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));

	emit_move_insn (adjust_address (registers, mode, size), tem);
	size += GET_MODE_SIZE (mode);
      }

  /* Save the arg pointer to the block.  */
  tem = copy_to_reg (crtl->args.internal_arg_pointer);
  /* We need the pointer as the caller actually passed them to us, not
     as we might have pretended they were passed.  Make sure it's a valid
     operand, as emit_move_insn isn't expected to handle a PLUS.  */
  if (STACK_GROWS_DOWNWARD)
    tem
      = force_operand (plus_constant (Pmode, tem,
				      crtl->args.pretend_args_size),
		       NULL_RTX);
  emit_move_insn (adjust_address (registers, Pmode, 0), tem);

  size = GET_MODE_SIZE (Pmode);

  /* Save the structure value address unless this is passed as an
     "invisible" first argument.  */
  if (struct_incoming_value)
    emit_move_insn (adjust_address (registers, Pmode, size),
		    copy_to_reg (struct_incoming_value));

  /* Return the address of the block.  */
  return copy_addr_to_reg (XEXP (registers, 0));
}

/* __builtin_apply_args returns block of memory allocated on
   the stack into which is stored the arg pointer, structure
   value address, static chain, and all the registers that might
   possibly be used in performing a function call.  The code is
   moved to the start of the function so the incoming values are
   saved.  */

static rtx
expand_builtin_apply_args (void)
{
  /* Don't do __builtin_apply_args more than once in a function.
     Save the result of the first call and reuse it.  */
  if (apply_args_value != 0)
    return apply_args_value;
  {
    /* When this function is called, it means that registers must be
       saved on entry to this function.  So we migrate the
       call to the first insn of this function.  */
    rtx temp;

    start_sequence ();
    temp = expand_builtin_apply_args_1 ();
    rtx_insn *seq = get_insns ();
    end_sequence ();

    apply_args_value = temp;

    /* Put the insns after the NOTE that starts the function.
       If this is inside a start_sequence, make the outer-level insn
       chain current, so the code is placed at the start of the
       function.  If internal_arg_pointer is a non-virtual pseudo,
       it needs to be placed after the function that initializes
       that pseudo.  */
    push_topmost_sequence ();
    if (REG_P (crtl->args.internal_arg_pointer)
	&& REGNO (crtl->args.internal_arg_pointer) > LAST_VIRTUAL_REGISTER)
      emit_insn_before (seq, parm_birth_insn);
    else
      emit_insn_before (seq, NEXT_INSN (entry_of_function ()));
    pop_topmost_sequence ();
    return temp;
  }
}

/* Perform an untyped call and save the state required to perform an
   untyped return of whatever value was returned by the given function.  */

static rtx
expand_builtin_apply (rtx function, rtx arguments, rtx argsize)
{
  int size, align, regno;
  fixed_size_mode mode;
  rtx incoming_args, result, reg, dest, src;
  rtx_call_insn *call_insn;
  rtx old_stack_level = 0;
  rtx call_fusage = 0;
  rtx struct_value = targetm.calls.struct_value_rtx (cfun ? TREE_TYPE (cfun->decl) : 0, 0);

  arguments = convert_memory_address (Pmode, arguments);

  /* Create a block where the return registers can be saved.  */
  result = assign_stack_local (BLKmode, apply_result_size (), -1);

  /* Fetch the arg pointer from the ARGUMENTS block.  */
  incoming_args = gen_reg_rtx (Pmode);
  emit_move_insn (incoming_args, gen_rtx_MEM (Pmode, arguments));
  if (!STACK_GROWS_DOWNWARD)
    incoming_args = expand_simple_binop (Pmode, MINUS, incoming_args, argsize,
					 incoming_args, 0, OPTAB_LIB_WIDEN);

  /* Push a new argument block and copy the arguments.  Do not allow
     the (potential) memcpy call below to interfere with our stack
     manipulations.  */
  do_pending_stack_adjust ();
  NO_DEFER_POP;

  /* Save the stack with nonlocal if available.  */
  if (targetm.have_save_stack_nonlocal ())
    emit_stack_save (SAVE_NONLOCAL, &old_stack_level);
  else
    emit_stack_save (SAVE_BLOCK, &old_stack_level);

  /* Allocate a block of memory onto the stack and copy the memory
     arguments to the outgoing arguments address.  We can pass TRUE
     as the 4th argument because we just saved the stack pointer
     and will restore it right after the call.  */
  allocate_dynamic_stack_space (argsize, 0, BIGGEST_ALIGNMENT, -1, true);

  /* Set DRAP flag to true, even though allocate_dynamic_stack_space
     may have already set current_function_calls_alloca to true.
     current_function_calls_alloca won't be set if argsize is zero,
     so we have to guarantee need_drap is true here.  */
  if (SUPPORTS_STACK_ALIGNMENT)
    crtl->need_drap = true;

  dest = virtual_outgoing_args_rtx;
  if (!STACK_GROWS_DOWNWARD)
    {
      if (CONST_INT_P (argsize))
	dest = plus_constant (Pmode, dest, -INTVAL (argsize));
      else
	dest = gen_rtx_PLUS (Pmode, dest, negate_rtx (Pmode, argsize));
    }
  dest = gen_rtx_MEM (BLKmode, dest);
  set_mem_align (dest, PARM_BOUNDARY);
  src = gen_rtx_MEM (BLKmode, incoming_args);
  set_mem_align (src, PARM_BOUNDARY);
  emit_block_move (dest, src, argsize, BLOCK_OP_NORMAL);

  /* Refer to the argument block.  */
  apply_args_size ();
  arguments = gen_rtx_MEM (BLKmode, arguments);
  set_mem_align (arguments, PARM_BOUNDARY);

  /* Walk past the arg-pointer and structure value address.  */
  size = GET_MODE_SIZE (Pmode);
  if (struct_value)
    size += GET_MODE_SIZE (Pmode);

  /* Restore each of the registers previously saved.  Make USE insns
     for each of these registers for use in making the call.  */
  for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
    if ((mode = apply_args_mode[regno]) != VOIDmode)
      {
	align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
	if (size % align != 0)
	  size = CEIL (size, align) * align;
	reg = gen_rtx_REG (mode, regno);
	emit_move_insn (reg, adjust_address (arguments, mode, size));
	use_reg (&call_fusage, reg);
	size += GET_MODE_SIZE (mode);
      }

  /* Restore the structure value address unless this is passed as an
     "invisible" first argument.  */
  size = GET_MODE_SIZE (Pmode);
  if (struct_value)
    {
      rtx value = gen_reg_rtx (Pmode);
      emit_move_insn (value, adjust_address (arguments, Pmode, size));
      emit_move_insn (struct_value, value);
      if (REG_P (struct_value))
	use_reg (&call_fusage, struct_value);
    }

  /* All arguments and registers used for the call are set up by now!  */
  function = prepare_call_address (NULL, function, NULL, &call_fusage, 0, 0);

  /* Ensure address is valid.  SYMBOL_REF is already valid, so no need,
     and we don't want to load it into a register as an optimization,
     because prepare_call_address already did it if it should be done.  */
  if (GET_CODE (function) != SYMBOL_REF)
    function = memory_address (FUNCTION_MODE, function);

  /* Generate the actual call instruction and save the return value.  */
  if (targetm.have_untyped_call ())
    {
      rtx mem = gen_rtx_MEM (FUNCTION_MODE, function);
      rtx_insn *seq = targetm.gen_untyped_call (mem, result,
						result_vector (1, result));
      for (rtx_insn *insn = seq; insn; insn = NEXT_INSN (insn))
	if (CALL_P (insn))
	  add_reg_note (insn, REG_UNTYPED_CALL, NULL_RTX);
      emit_insn (seq);
    }
  else if (targetm.have_call_value ())
    {
      rtx valreg = 0;

      /* Locate the unique return register.  It is not possible to
	 express a call that sets more than one return register using
	 call_value; use untyped_call for that.  In fact, untyped_call
	 only needs to save the return registers in the given block.  */
      for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
	if ((mode = apply_result_mode[regno]) != VOIDmode)
	  {
	    gcc_assert (!valreg); /* have_untyped_call required.  */

	    valreg = gen_rtx_REG (mode, regno);
	  }

      emit_insn (targetm.gen_call_value (valreg,
					 gen_rtx_MEM (FUNCTION_MODE, function),
					 const0_rtx, NULL_RTX, const0_rtx));

      emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
    }
  else
    gcc_unreachable ();

  /* Find the CALL insn we just emitted, and attach the register usage
     information.  */
  call_insn = last_call_insn ();
  add_function_usage_to (call_insn, call_fusage);

  /* Restore the stack.  */
  if (targetm.have_save_stack_nonlocal ())
    emit_stack_restore (SAVE_NONLOCAL, old_stack_level);
  else
    emit_stack_restore (SAVE_BLOCK, old_stack_level);
  fixup_args_size_notes (call_insn, get_last_insn (), 0);

  OK_DEFER_POP;

  /* Return the address of the result block.  */
  result = copy_addr_to_reg (XEXP (result, 0));
  return convert_memory_address (ptr_mode, result);
}

/* Perform an untyped return.  */

static void
expand_builtin_return (rtx result)
{
  int size, align, regno;
  fixed_size_mode mode;
  rtx reg;
  rtx_insn *call_fusage = 0;

  result = convert_memory_address (Pmode, result);

  apply_result_size ();
  result = gen_rtx_MEM (BLKmode, result);

  if (targetm.have_untyped_return ())
    {
      rtx vector = result_vector (0, result);
      emit_jump_insn (targetm.gen_untyped_return (result, vector));
      emit_barrier ();
      return;
    }

  /* Restore the return value and note that each value is used.  */
  size = 0;
  for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
    if ((mode = apply_result_mode[regno]) != VOIDmode)
      {
	align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
	if (size % align != 0)
	  size = CEIL (size, align) * align;
	reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
	emit_move_insn (reg, adjust_address (result, mode, size));

	push_to_sequence (call_fusage);
	emit_use (reg);
	call_fusage = get_insns ();
	end_sequence ();
	size += GET_MODE_SIZE (mode);
      }

  /* Put the USE insns before the return.  */
  emit_insn (call_fusage);

  /* Return whatever values was restored by jumping directly to the end
     of the function.  */
  expand_naked_return ();
}

/* Used by expand_builtin_classify_type and fold_builtin_classify_type.  */

static enum type_class
type_to_class (tree type)
{
  switch (TREE_CODE (type))
    {
    case VOID_TYPE:	   return void_type_class;
    case INTEGER_TYPE:	   return integer_type_class;
    case ENUMERAL_TYPE:	   return enumeral_type_class;
    case BOOLEAN_TYPE:	   return boolean_type_class;
    case POINTER_TYPE:	   return pointer_type_class;
    case REFERENCE_TYPE:   return reference_type_class;
    case OFFSET_TYPE:	   return offset_type_class;
    case REAL_TYPE:	   return real_type_class;
    case COMPLEX_TYPE:	   return complex_type_class;
    case FUNCTION_TYPE:	   return function_type_class;
    case METHOD_TYPE:	   return method_type_class;
    case RECORD_TYPE:	   return record_type_class;
    case UNION_TYPE:
    case QUAL_UNION_TYPE:  return union_type_class;
    case ARRAY_TYPE:	   return (TYPE_STRING_FLAG (type)
				   ? string_type_class : array_type_class);
    case LANG_TYPE:	   return lang_type_class;
    case OPAQUE_TYPE:      return opaque_type_class;
    default:		   return no_type_class;
    }
}

/* Expand a call EXP to __builtin_classify_type.  */

static rtx
expand_builtin_classify_type (tree exp)
{
  if (call_expr_nargs (exp))
    return GEN_INT (type_to_class (TREE_TYPE (CALL_EXPR_ARG (exp, 0))));
  return GEN_INT (no_type_class);
}

/* This helper macro, meant to be used in mathfn_built_in below, determines
   which among a set of builtin math functions is appropriate for a given type
   mode.  The `F' (float) and `L' (long double) are automatically generated
   from the 'double' case.  If a function supports the _Float<N> and _Float<N>X
   types, there are additional types that are considered with 'F32', 'F64',
   'F128', etc. suffixes.  */
#define CASE_MATHFN(MATHFN) \
  CASE_CFN_##MATHFN: \
  fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
  fcodel = BUILT_IN_##MATHFN##L ; break;
/* Similar to the above, but also add support for the _Float<N> and _Float<N>X
   types.  */
#define CASE_MATHFN_FLOATN(MATHFN) \
  CASE_CFN_##MATHFN: \
  fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
  fcodel = BUILT_IN_##MATHFN##L ; fcodef16 = BUILT_IN_##MATHFN##F16 ; \
  fcodef32 = BUILT_IN_##MATHFN##F32; fcodef64 = BUILT_IN_##MATHFN##F64 ; \
  fcodef128 = BUILT_IN_##MATHFN##F128 ; fcodef32x = BUILT_IN_##MATHFN##F32X ; \
  fcodef64x = BUILT_IN_##MATHFN##F64X ; fcodef128x = BUILT_IN_##MATHFN##F128X ;\
  break;
/* Similar to above, but appends _R after any F/L suffix.  */
#define CASE_MATHFN_REENT(MATHFN) \
  case CFN_BUILT_IN_##MATHFN##_R: \
  case CFN_BUILT_IN_##MATHFN##F_R: \
  case CFN_BUILT_IN_##MATHFN##L_R: \
  fcode = BUILT_IN_##MATHFN##_R; fcodef = BUILT_IN_##MATHFN##F_R ; \
  fcodel = BUILT_IN_##MATHFN##L_R ; break;

/* Return a function equivalent to FN but operating on floating-point
   values of type TYPE, or END_BUILTINS if no such function exists.
   This is purely an operation on function codes; it does not guarantee
   that the target actually has an implementation of the function.  */

static built_in_function
mathfn_built_in_2 (tree type, combined_fn fn)
{
  tree mtype;
  built_in_function fcode, fcodef, fcodel;
  built_in_function fcodef16 = END_BUILTINS;
  built_in_function fcodef32 = END_BUILTINS;
  built_in_function fcodef64 = END_BUILTINS;
  built_in_function fcodef128 = END_BUILTINS;
  built_in_function fcodef32x = END_BUILTINS;
  built_in_function fcodef64x = END_BUILTINS;
  built_in_function fcodef128x = END_BUILTINS;

  switch (fn)
    {
#define SEQ_OF_CASE_MATHFN			\
    CASE_MATHFN (ACOS)				\
    CASE_MATHFN (ACOSH)				\
    CASE_MATHFN (ASIN)				\
    CASE_MATHFN (ASINH)				\
    CASE_MATHFN (ATAN)				\
    CASE_MATHFN (ATAN2)				\
    CASE_MATHFN (ATANH)				\
    CASE_MATHFN (CBRT)				\
    CASE_MATHFN_FLOATN (CEIL)			\
    CASE_MATHFN (CEXPI)				\
    CASE_MATHFN_FLOATN (COPYSIGN)		\
    CASE_MATHFN (COS)				\
    CASE_MATHFN (COSH)				\
    CASE_MATHFN (DREM)				\
    CASE_MATHFN (ERF)				\
    CASE_MATHFN (ERFC)				\
    CASE_MATHFN (EXP)				\
    CASE_MATHFN (EXP10)				\
    CASE_MATHFN (EXP2)				\
    CASE_MATHFN (EXPM1)				\
    CASE_MATHFN (FABS)				\
    CASE_MATHFN (FDIM)				\
    CASE_MATHFN_FLOATN (FLOOR)			\
    CASE_MATHFN_FLOATN (FMA)			\
    CASE_MATHFN_FLOATN (FMAX)			\
    CASE_MATHFN_FLOATN (FMIN)			\
    CASE_MATHFN (FMOD)				\
    CASE_MATHFN (FREXP)				\
    CASE_MATHFN (GAMMA)				\
    CASE_MATHFN_REENT (GAMMA) /* GAMMA_R */	\
    CASE_MATHFN (HUGE_VAL)			\
    CASE_MATHFN (HYPOT)				\
    CASE_MATHFN (ILOGB)				\
    CASE_MATHFN (ICEIL)				\
    CASE_MATHFN (IFLOOR)			\
    CASE_MATHFN (INF)				\
    CASE_MATHFN (IRINT)				\
    CASE_MATHFN (IROUND)			\
    CASE_MATHFN (ISINF)				\
    CASE_MATHFN (J0)				\
    CASE_MATHFN (J1)				\
    CASE_MATHFN (JN)				\
    CASE_MATHFN (LCEIL)				\
    CASE_MATHFN (LDEXP)				\
    CASE_MATHFN (LFLOOR)			\
    CASE_MATHFN (LGAMMA)			\
    CASE_MATHFN_REENT (LGAMMA) /* LGAMMA_R */	\
    CASE_MATHFN (LLCEIL)			\
    CASE_MATHFN (LLFLOOR)			\
    CASE_MATHFN (LLRINT)			\
    CASE_MATHFN (LLROUND)			\
    CASE_MATHFN (LOG)				\
    CASE_MATHFN (LOG10)				\
    CASE_MATHFN (LOG1P)				\
    CASE_MATHFN (LOG2)				\
    CASE_MATHFN (LOGB)				\
    CASE_MATHFN (LRINT)				\
    CASE_MATHFN (LROUND)			\
    CASE_MATHFN (MODF)				\
    CASE_MATHFN (NAN)				\
    CASE_MATHFN (NANS)				\
    CASE_MATHFN_FLOATN (NEARBYINT)		\
    CASE_MATHFN (NEXTAFTER)			\
    CASE_MATHFN (NEXTTOWARD)			\
    CASE_MATHFN (POW)				\
    CASE_MATHFN (POWI)				\
    CASE_MATHFN (POW10)				\
    CASE_MATHFN (REMAINDER)			\
    CASE_MATHFN (REMQUO)			\
    CASE_MATHFN_FLOATN (RINT)			\
    CASE_MATHFN_FLOATN (ROUND)			\
    CASE_MATHFN_FLOATN (ROUNDEVEN)		\
    CASE_MATHFN (SCALB)				\
    CASE_MATHFN (SCALBLN)			\
    CASE_MATHFN (SCALBN)			\
    CASE_MATHFN (SIGNBIT)			\
    CASE_MATHFN (SIGNIFICAND)			\
    CASE_MATHFN (SIN)				\
    CASE_MATHFN (SINCOS)			\
    CASE_MATHFN (SINH)				\
    CASE_MATHFN_FLOATN (SQRT)			\
    CASE_MATHFN (TAN)				\
    CASE_MATHFN (TANH)				\
    CASE_MATHFN (TGAMMA)			\
    CASE_MATHFN_FLOATN (TRUNC)			\
    CASE_MATHFN (Y0)				\
    CASE_MATHFN (Y1)				\
    CASE_MATHFN (YN)

    SEQ_OF_CASE_MATHFN

    default:
      return END_BUILTINS;
    }

  mtype = TYPE_MAIN_VARIANT (type);
  if (mtype == double_type_node)
    return fcode;
  else if (mtype == float_type_node)
    return fcodef;
  else if (mtype == long_double_type_node)
    return fcodel;
  else if (mtype == float16_type_node)
    return fcodef16;
  else if (mtype == float32_type_node)
    return fcodef32;
  else if (mtype == float64_type_node)
    return fcodef64;
  else if (mtype == float128_type_node)
    return fcodef128;
  else if (mtype == float32x_type_node)
    return fcodef32x;
  else if (mtype == float64x_type_node)
    return fcodef64x;
  else if (mtype == float128x_type_node)
    return fcodef128x;
  else
    return END_BUILTINS;
}

#undef CASE_MATHFN
#undef CASE_MATHFN_FLOATN
#undef CASE_MATHFN_REENT

/* Return mathematic function equivalent to FN but operating directly on TYPE,
   if available.  If IMPLICIT_P is true use the implicit builtin declaration,
   otherwise use the explicit declaration.  If we can't do the conversion,
   return null.  */

static tree
mathfn_built_in_1 (tree type, combined_fn fn, bool implicit_p)
{
  built_in_function fcode2 = mathfn_built_in_2 (type, fn);
  if (fcode2 == END_BUILTINS)
    return NULL_TREE;

  if (implicit_p && !builtin_decl_implicit_p (fcode2))
    return NULL_TREE;

  return builtin_decl_explicit (fcode2);
}

/* Like mathfn_built_in_1, but always use the implicit array.  */

tree
mathfn_built_in (tree type, combined_fn fn)
{
  return mathfn_built_in_1 (type, fn, /*implicit=*/ 1);
}

/* Like mathfn_built_in_1, but take a built_in_function and
   always use the implicit array.  */

tree
mathfn_built_in (tree type, enum built_in_function fn)
{
  return mathfn_built_in_1 (type, as_combined_fn (fn), /*implicit=*/ 1);
}

/* Return the type associated with a built in function, i.e., the one
   to be passed to mathfn_built_in to get the type-specific
   function.  */

tree
mathfn_built_in_type (combined_fn fn)
{
#define CASE_MATHFN(MATHFN)			\
  case CFN_BUILT_IN_##MATHFN:			\
    return double_type_node;			\
  case CFN_BUILT_IN_##MATHFN##F:		\
    return float_type_node;			\
  case CFN_BUILT_IN_##MATHFN##L:		\
    return long_double_type_node;

#define CASE_MATHFN_FLOATN(MATHFN)		\
  CASE_MATHFN(MATHFN)				\
  case CFN_BUILT_IN_##MATHFN##F16:		\
    return float16_type_node;			\
  case CFN_BUILT_IN_##MATHFN##F32:		\
    return float32_type_node;			\
  case CFN_BUILT_IN_##MATHFN##F64:		\
    return float64_type_node;			\
  case CFN_BUILT_IN_##MATHFN##F128:		\
    return float128_type_node;			\
  case CFN_BUILT_IN_##MATHFN##F32X:		\
    return float32x_type_node;			\
  case CFN_BUILT_IN_##MATHFN##F64X:		\
    return float64x_type_node;			\
  case CFN_BUILT_IN_##MATHFN##F128X:		\
    return float128x_type_node;

/* Similar to above, but appends _R after any F/L suffix.  */
#define CASE_MATHFN_REENT(MATHFN) \
  case CFN_BUILT_IN_##MATHFN##_R:		\
    return double_type_node;			\
  case CFN_BUILT_IN_##MATHFN##F_R:		\
    return float_type_node;			\
  case CFN_BUILT_IN_##MATHFN##L_R:		\
    return long_double_type_node;

  switch (fn)
    {
    SEQ_OF_CASE_MATHFN

    default:
      return NULL_TREE;
    }

#undef CASE_MATHFN
#undef CASE_MATHFN_FLOATN
#undef CASE_MATHFN_REENT
#undef SEQ_OF_CASE_MATHFN
}

/* If BUILT_IN_NORMAL function FNDECL has an associated internal function,
   return its code, otherwise return IFN_LAST.  Note that this function
   only tests whether the function is defined in internals.def, not whether
   it is actually available on the target.  */

internal_fn
associated_internal_fn (tree fndecl)
{
  gcc_checking_assert (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL);
  tree return_type = TREE_TYPE (TREE_TYPE (fndecl));
  switch (DECL_FUNCTION_CODE (fndecl))
    {
#define DEF_INTERNAL_FLT_FN(NAME, FLAGS, OPTAB, TYPE) \
    CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME;
#define DEF_INTERNAL_FLT_FLOATN_FN(NAME, FLAGS, OPTAB, TYPE) \
    CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME; \
    CASE_FLT_FN_FLOATN_NX (BUILT_IN_##NAME): return IFN_##NAME;
#define DEF_INTERNAL_INT_FN(NAME, FLAGS, OPTAB, TYPE) \
    CASE_INT_FN (BUILT_IN_##NAME): return IFN_##NAME;
#include "internal-fn.def"

    CASE_FLT_FN (BUILT_IN_POW10):
      return IFN_EXP10;

    CASE_FLT_FN (BUILT_IN_DREM):
      return IFN_REMAINDER;

    CASE_FLT_FN (BUILT_IN_SCALBN):
    CASE_FLT_FN (BUILT_IN_SCALBLN):
      if (REAL_MODE_FORMAT (TYPE_MODE (return_type))->b == 2)
	return IFN_LDEXP;
      return IFN_LAST;

    default:
      return IFN_LAST;
    }
}

/* If CALL is a call to a BUILT_IN_NORMAL function that could be replaced
   on the current target by a call to an internal function, return the
   code of that internal function, otherwise return IFN_LAST.  The caller
   is responsible for ensuring that any side-effects of the built-in
   call are dealt with correctly.  E.g. if CALL sets errno, the caller
   must decide that the errno result isn't needed or make it available
   in some other way.  */

internal_fn
replacement_internal_fn (gcall *call)
{
  if (gimple_call_builtin_p (call, BUILT_IN_NORMAL))
    {
      internal_fn ifn = associated_internal_fn (gimple_call_fndecl (call));
      if (ifn != IFN_LAST)
	{
	  tree_pair types = direct_internal_fn_types (ifn, call);
	  optimization_type opt_type = bb_optimization_type (gimple_bb (call));
	  if (direct_internal_fn_supported_p (ifn, types, opt_type))
	    return ifn;
	}
    }
  return IFN_LAST;
}

/* Expand a call to the builtin trinary math functions (fma).
   Return NULL_RTX if a normal call should be emitted rather than expanding the
   function in-line.  EXP is the expression that is a call to the builtin
   function; if convenient, the result should be placed in TARGET.
   SUBTARGET may be used as the target for computing one of EXP's
   operands.  */

static rtx
expand_builtin_mathfn_ternary (tree exp, rtx target, rtx subtarget)
{
  optab builtin_optab;
  rtx op0, op1, op2, result;
  rtx_insn *insns;
  tree fndecl = get_callee_fndecl (exp);
  tree arg0, arg1, arg2;
  machine_mode mode;

  if (!validate_arglist (exp, REAL_TYPE, REAL_TYPE, REAL_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg0 = CALL_EXPR_ARG (exp, 0);
  arg1 = CALL_EXPR_ARG (exp, 1);
  arg2 = CALL_EXPR_ARG (exp, 2);

  switch (DECL_FUNCTION_CODE (fndecl))
    {
    CASE_FLT_FN (BUILT_IN_FMA):
    CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMA):
      builtin_optab = fma_optab; break;
    default:
      gcc_unreachable ();
    }

  /* Make a suitable register to place result in.  */
  mode = TYPE_MODE (TREE_TYPE (exp));

  /* Before working hard, check whether the instruction is available.  */
  if (optab_handler (builtin_optab, mode) == CODE_FOR_nothing)
    return NULL_RTX;

  result = gen_reg_rtx (mode);

  /* Always stabilize the argument list.  */
  CALL_EXPR_ARG (exp, 0) = arg0 = builtin_save_expr (arg0);
  CALL_EXPR_ARG (exp, 1) = arg1 = builtin_save_expr (arg1);
  CALL_EXPR_ARG (exp, 2) = arg2 = builtin_save_expr (arg2);

  op0 = expand_expr (arg0, subtarget, VOIDmode, EXPAND_NORMAL);
  op1 = expand_normal (arg1);
  op2 = expand_normal (arg2);

  start_sequence ();

  /* Compute into RESULT.
     Set RESULT to wherever the result comes back.  */
  result = expand_ternary_op (mode, builtin_optab, op0, op1, op2,
			      result, 0);

  /* If we were unable to expand via the builtin, stop the sequence
     (without outputting the insns) and call to the library function
     with the stabilized argument list.  */
  if (result == 0)
    {
      end_sequence ();
      return expand_call (exp, target, target == const0_rtx);
    }

  /* Output the entire sequence.  */
  insns = get_insns ();
  end_sequence ();
  emit_insn (insns);

  return result;
}

/* Expand a call to the builtin sin and cos math functions.
   Return NULL_RTX if a normal call should be emitted rather than expanding the
   function in-line.  EXP is the expression that is a call to the builtin
   function; if convenient, the result should be placed in TARGET.
   SUBTARGET may be used as the target for computing one of EXP's
   operands.  */

static rtx
expand_builtin_mathfn_3 (tree exp, rtx target, rtx subtarget)
{
  optab builtin_optab;
  rtx op0;
  rtx_insn *insns;
  tree fndecl = get_callee_fndecl (exp);
  machine_mode mode;
  tree arg;

  if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);

  switch (DECL_FUNCTION_CODE (fndecl))
    {
    CASE_FLT_FN (BUILT_IN_SIN):
    CASE_FLT_FN (BUILT_IN_COS):
      builtin_optab = sincos_optab; break;
    default:
      gcc_unreachable ();
    }

  /* Make a suitable register to place result in.  */
  mode = TYPE_MODE (TREE_TYPE (exp));

  /* Check if sincos insn is available, otherwise fallback
     to sin or cos insn.  */
  if (optab_handler (builtin_optab, mode) == CODE_FOR_nothing)
    switch (DECL_FUNCTION_CODE (fndecl))
      {
      CASE_FLT_FN (BUILT_IN_SIN):
	builtin_optab = sin_optab; break;
      CASE_FLT_FN (BUILT_IN_COS):
	builtin_optab = cos_optab; break;
      default:
	gcc_unreachable ();
      }

  /* Before working hard, check whether the instruction is available.  */
  if (optab_handler (builtin_optab, mode) != CODE_FOR_nothing)
    {
      rtx result = gen_reg_rtx (mode);

      /* Wrap the computation of the argument in a SAVE_EXPR, as we may
	 need to expand the argument again.  This way, we will not perform
	 side-effects more the once.  */
      CALL_EXPR_ARG (exp, 0) = arg = builtin_save_expr (arg);

      op0 = expand_expr (arg, subtarget, VOIDmode, EXPAND_NORMAL);

      start_sequence ();

      /* Compute into RESULT.
	 Set RESULT to wherever the result comes back.  */
      if (builtin_optab == sincos_optab)
	{
	  int ok;

	  switch (DECL_FUNCTION_CODE (fndecl))
	    {
	    CASE_FLT_FN (BUILT_IN_SIN):
	      ok = expand_twoval_unop (builtin_optab, op0, 0, result, 0);
	      break;
	    CASE_FLT_FN (BUILT_IN_COS):
	      ok = expand_twoval_unop (builtin_optab, op0, result, 0, 0);
	      break;
	    default:
	      gcc_unreachable ();
	    }
	  gcc_assert (ok);
	}
      else
	result = expand_unop (mode, builtin_optab, op0, result, 0);

      if (result != 0)
	{
	  /* Output the entire sequence.  */
	  insns = get_insns ();
	  end_sequence ();
	  emit_insn (insns);
	  return result;
	}

      /* If we were unable to expand via the builtin, stop the sequence
	 (without outputting the insns) and call to the library function
	 with the stabilized argument list.  */
      end_sequence ();
    }

  return expand_call (exp, target, target == const0_rtx);
}

/* Given an interclass math builtin decl FNDECL and it's argument ARG
   return an RTL instruction code that implements the functionality.
   If that isn't possible or available return CODE_FOR_nothing.  */

static enum insn_code
interclass_mathfn_icode (tree arg, tree fndecl)
{
  bool errno_set = false;
  optab builtin_optab = unknown_optab;
  machine_mode mode;

  switch (DECL_FUNCTION_CODE (fndecl))
    {
    CASE_FLT_FN (BUILT_IN_ILOGB):
      errno_set = true; builtin_optab = ilogb_optab; break;
    CASE_FLT_FN (BUILT_IN_ISINF):
      builtin_optab = isinf_optab; break;
    case BUILT_IN_ISNORMAL:
    case BUILT_IN_ISFINITE:
    CASE_FLT_FN (BUILT_IN_FINITE):
    case BUILT_IN_FINITED32:
    case BUILT_IN_FINITED64:
    case BUILT_IN_FINITED128:
    case BUILT_IN_ISINFD32:
    case BUILT_IN_ISINFD64:
    case BUILT_IN_ISINFD128:
      /* These builtins have no optabs (yet).  */
      break;
    default:
      gcc_unreachable ();
    }

  /* There's no easy way to detect the case we need to set EDOM.  */
  if (flag_errno_math && errno_set)
    return CODE_FOR_nothing;

  /* Optab mode depends on the mode of the input argument.  */
  mode = TYPE_MODE (TREE_TYPE (arg));

  if (builtin_optab)
    return optab_handler (builtin_optab, mode);
  return CODE_FOR_nothing;
}

/* Expand a call to one of the builtin math functions that operate on
   floating point argument and output an integer result (ilogb, isinf,
   isnan, etc).
   Return 0 if a normal call should be emitted rather than expanding the
   function in-line.  EXP is the expression that is a call to the builtin
   function; if convenient, the result should be placed in TARGET.  */

static rtx
expand_builtin_interclass_mathfn (tree exp, rtx target)
{
  enum insn_code icode = CODE_FOR_nothing;
  rtx op0;
  tree fndecl = get_callee_fndecl (exp);
  machine_mode mode;
  tree arg;

  if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);
  icode = interclass_mathfn_icode (arg, fndecl);
  mode = TYPE_MODE (TREE_TYPE (arg));

  if (icode != CODE_FOR_nothing)
    {
      class expand_operand ops[1];
      rtx_insn *last = get_last_insn ();
      tree orig_arg = arg;

      /* Wrap the computation of the argument in a SAVE_EXPR, as we may
	 need to expand the argument again.  This way, we will not perform
	 side-effects more the once.  */
      CALL_EXPR_ARG (exp, 0) = arg = builtin_save_expr (arg);

      op0 = expand_expr (arg, NULL_RTX, VOIDmode, EXPAND_NORMAL);

      if (mode != GET_MODE (op0))
	op0 = convert_to_mode (mode, op0, 0);

      create_output_operand (&ops[0], target, TYPE_MODE (TREE_TYPE (exp)));
      if (maybe_legitimize_operands (icode, 0, 1, ops)
	  && maybe_emit_unop_insn (icode, ops[0].value, op0, UNKNOWN))
	return ops[0].value;

      delete_insns_since (last);
      CALL_EXPR_ARG (exp, 0) = orig_arg;
    }

  return NULL_RTX;
}

/* Expand a call to the builtin sincos math function.
   Return NULL_RTX if a normal call should be emitted rather than expanding the
   function in-line.  EXP is the expression that is a call to the builtin
   function.  */

static rtx
expand_builtin_sincos (tree exp)
{
  rtx op0, op1, op2, target1, target2;
  machine_mode mode;
  tree arg, sinp, cosp;
  int result;
  location_t loc = EXPR_LOCATION (exp);
  tree alias_type, alias_off;

  if (!validate_arglist (exp, REAL_TYPE,
 			 POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);
  sinp = CALL_EXPR_ARG (exp, 1);
  cosp = CALL_EXPR_ARG (exp, 2);

  /* Make a suitable register to place result in.  */
  mode = TYPE_MODE (TREE_TYPE (arg));

  /* Check if sincos insn is available, otherwise emit the call.  */
  if (optab_handler (sincos_optab, mode) == CODE_FOR_nothing)
    return NULL_RTX;

  target1 = gen_reg_rtx (mode);
  target2 = gen_reg_rtx (mode);

  op0 = expand_normal (arg);
  alias_type = build_pointer_type_for_mode (TREE_TYPE (arg), ptr_mode, true);
  alias_off = build_int_cst (alias_type, 0);
  op1 = expand_normal (fold_build2_loc (loc, MEM_REF, TREE_TYPE (arg),
					sinp, alias_off));
  op2 = expand_normal (fold_build2_loc (loc, MEM_REF, TREE_TYPE (arg),
					cosp, alias_off));

  /* Compute into target1 and target2.
     Set TARGET to wherever the result comes back.  */
  result = expand_twoval_unop (sincos_optab, op0, target2, target1, 0);
  gcc_assert (result);

  /* Move target1 and target2 to the memory locations indicated
     by op1 and op2.  */
  emit_move_insn (op1, target1);
  emit_move_insn (op2, target2);

  return const0_rtx;
}

/* Expand a call to the internal cexpi builtin to the sincos math function.
   EXP is the expression that is a call to the builtin function; if convenient,
   the result should be placed in TARGET.  */

static rtx
expand_builtin_cexpi (tree exp, rtx target)
{
  tree fndecl = get_callee_fndecl (exp);
  tree arg, type;
  machine_mode mode;
  rtx op0, op1, op2;
  location_t loc = EXPR_LOCATION (exp);

  if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);
  type = TREE_TYPE (arg);
  mode = TYPE_MODE (TREE_TYPE (arg));

  /* Try expanding via a sincos optab, fall back to emitting a libcall
     to sincos or cexp.  We are sure we have sincos or cexp because cexpi
     is only generated from sincos, cexp or if we have either of them.  */
  if (optab_handler (sincos_optab, mode) != CODE_FOR_nothing)
    {
      op1 = gen_reg_rtx (mode);
      op2 = gen_reg_rtx (mode);

      op0 = expand_expr (arg, NULL_RTX, VOIDmode, EXPAND_NORMAL);

      /* Compute into op1 and op2.  */
      expand_twoval_unop (sincos_optab, op0, op2, op1, 0);
    }
  else if (targetm.libc_has_function (function_sincos, type))
    {
      tree call, fn = NULL_TREE;
      tree top1, top2;
      rtx op1a, op2a;

      if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CEXPIF)
	fn = builtin_decl_explicit (BUILT_IN_SINCOSF);
      else if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CEXPI)
	fn = builtin_decl_explicit (BUILT_IN_SINCOS);
      else if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CEXPIL)
	fn = builtin_decl_explicit (BUILT_IN_SINCOSL);
      else
	gcc_unreachable ();

      op1 = assign_temp (TREE_TYPE (arg), 1, 1);
      op2 = assign_temp (TREE_TYPE (arg), 1, 1);
      op1a = copy_addr_to_reg (XEXP (op1, 0));
      op2a = copy_addr_to_reg (XEXP (op2, 0));
      top1 = make_tree (build_pointer_type (TREE_TYPE (arg)), op1a);
      top2 = make_tree (build_pointer_type (TREE_TYPE (arg)), op2a);

      /* Make sure not to fold the sincos call again.  */
      call = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
      expand_normal (build_call_nary (TREE_TYPE (TREE_TYPE (fn)),
				      call, 3, arg, top1, top2));
    }
  else
    {
      tree call, fn = NULL_TREE, narg;
      tree ctype = build_complex_type (type);

      if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CEXPIF)
	fn = builtin_decl_explicit (BUILT_IN_CEXPF);
      else if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CEXPI)
	fn = builtin_decl_explicit (BUILT_IN_CEXP);
      else if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CEXPIL)
	fn = builtin_decl_explicit (BUILT_IN_CEXPL);
      else
	gcc_unreachable ();

      /* If we don't have a decl for cexp create one.  This is the
	 friendliest fallback if the user calls __builtin_cexpi
	 without full target C99 function support.  */
      if (fn == NULL_TREE)
	{
	  tree fntype;
	  const char *name = NULL;

	  if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CEXPIF)
	    name = "cexpf";
	  else if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CEXPI)
	    name = "cexp";
	  else if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_CEXPIL)
	    name = "cexpl";

	  fntype = build_function_type_list (ctype, ctype, NULL_TREE);
	  fn = build_fn_decl (name, fntype);
	}

      narg = fold_build2_loc (loc, COMPLEX_EXPR, ctype,
			  build_real (type, dconst0), arg);

      /* Make sure not to fold the cexp call again.  */
      call = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
      return expand_expr (build_call_nary (ctype, call, 1, narg),
			  target, VOIDmode, EXPAND_NORMAL);
    }

  /* Now build the proper return type.  */
  return expand_expr (build2 (COMPLEX_EXPR, build_complex_type (type),
			      make_tree (TREE_TYPE (arg), op2),
			      make_tree (TREE_TYPE (arg), op1)),
		      target, VOIDmode, EXPAND_NORMAL);
}

/* Conveniently construct a function call expression.  FNDECL names the
   function to be called, N is the number of arguments, and the "..."
   parameters are the argument expressions.  Unlike build_call_exr
   this doesn't fold the call, hence it will always return a CALL_EXPR.  */

static tree
build_call_nofold_loc (location_t loc, tree fndecl, int n, ...)
{
  va_list ap;
  tree fntype = TREE_TYPE (fndecl);
  tree fn = build1 (ADDR_EXPR, build_pointer_type (fntype), fndecl);

  va_start (ap, n);
  fn = build_call_valist (TREE_TYPE (fntype), fn, n, ap);
  va_end (ap);
  SET_EXPR_LOCATION (fn, loc);
  return fn;
}

/* Expand a call to one of the builtin rounding functions gcc defines
   as an extension (lfloor and lceil).  As these are gcc extensions we
   do not need to worry about setting errno to EDOM.
   If expanding via optab fails, lower expression to (int)(floor(x)).
   EXP is the expression that is a call to the builtin function;
   if convenient, the result should be placed in TARGET.  */

static rtx
expand_builtin_int_roundingfn (tree exp, rtx target)
{
  convert_optab builtin_optab;
  rtx op0, tmp;
  rtx_insn *insns;
  tree fndecl = get_callee_fndecl (exp);
  enum built_in_function fallback_fn;
  tree fallback_fndecl;
  machine_mode mode;
  tree arg;

  if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);

  switch (DECL_FUNCTION_CODE (fndecl))
    {
    CASE_FLT_FN (BUILT_IN_ICEIL):
    CASE_FLT_FN (BUILT_IN_LCEIL):
    CASE_FLT_FN (BUILT_IN_LLCEIL):
      builtin_optab = lceil_optab;
      fallback_fn = BUILT_IN_CEIL;
      break;

    CASE_FLT_FN (BUILT_IN_IFLOOR):
    CASE_FLT_FN (BUILT_IN_LFLOOR):
    CASE_FLT_FN (BUILT_IN_LLFLOOR):
      builtin_optab = lfloor_optab;
      fallback_fn = BUILT_IN_FLOOR;
      break;

    default:
      gcc_unreachable ();
    }

  /* Make a suitable register to place result in.  */
  mode = TYPE_MODE (TREE_TYPE (exp));

  target = gen_reg_rtx (mode);

  /* Wrap the computation of the argument in a SAVE_EXPR, as we may
     need to expand the argument again.  This way, we will not perform
     side-effects more the once.  */
  CALL_EXPR_ARG (exp, 0) = arg = builtin_save_expr (arg);

  op0 = expand_expr (arg, NULL, VOIDmode, EXPAND_NORMAL);

  start_sequence ();

  /* Compute into TARGET.  */
  if (expand_sfix_optab (target, op0, builtin_optab))
    {
      /* Output the entire sequence.  */
      insns = get_insns ();
      end_sequence ();
      emit_insn (insns);
      return target;
    }

  /* If we were unable to expand via the builtin, stop the sequence
     (without outputting the insns).  */
  end_sequence ();

  /* Fall back to floating point rounding optab.  */
  fallback_fndecl = mathfn_built_in (TREE_TYPE (arg), fallback_fn);

  /* For non-C99 targets we may end up without a fallback fndecl here
     if the user called __builtin_lfloor directly.  In this case emit
     a call to the floor/ceil variants nevertheless.  This should result
     in the best user experience for not full C99 targets.  */
  if (fallback_fndecl == NULL_TREE)
    {
      tree fntype;
      const char *name = NULL;

      switch (DECL_FUNCTION_CODE (fndecl))
	{
	case BUILT_IN_ICEIL:
	case BUILT_IN_LCEIL:
	case BUILT_IN_LLCEIL:
	  name = "ceil";
	  break;
	case BUILT_IN_ICEILF:
	case BUILT_IN_LCEILF:
	case BUILT_IN_LLCEILF:
	  name = "ceilf";
	  break;
	case BUILT_IN_ICEILL:
	case BUILT_IN_LCEILL:
	case BUILT_IN_LLCEILL:
	  name = "ceill";
	  break;
	case BUILT_IN_IFLOOR:
	case BUILT_IN_LFLOOR:
	case BUILT_IN_LLFLOOR:
	  name = "floor";
	  break;
	case BUILT_IN_IFLOORF:
	case BUILT_IN_LFLOORF:
	case BUILT_IN_LLFLOORF:
	  name = "floorf";
	  break;
	case BUILT_IN_IFLOORL:
	case BUILT_IN_LFLOORL:
	case BUILT_IN_LLFLOORL:
	  name = "floorl";
	  break;
	default:
	  gcc_unreachable ();
	}

      fntype = build_function_type_list (TREE_TYPE (arg),
					 TREE_TYPE (arg), NULL_TREE);
      fallback_fndecl = build_fn_decl (name, fntype);
    }

  exp = build_call_nofold_loc (EXPR_LOCATION (exp), fallback_fndecl, 1, arg);

  tmp = expand_normal (exp);
  tmp = maybe_emit_group_store (tmp, TREE_TYPE (exp));

  /* Truncate the result of floating point optab to integer
     via expand_fix ().  */
  target = gen_reg_rtx (mode);
  expand_fix (target, tmp, 0);

  return target;
}

/* Expand a call to one of the builtin math functions doing integer
   conversion (lrint).
   Return 0 if a normal call should be emitted rather than expanding the
   function in-line.  EXP is the expression that is a call to the builtin
   function; if convenient, the result should be placed in TARGET.  */

static rtx
expand_builtin_int_roundingfn_2 (tree exp, rtx target)
{
  convert_optab builtin_optab;
  rtx op0;
  rtx_insn *insns;
  tree fndecl = get_callee_fndecl (exp);
  tree arg;
  machine_mode mode;
  enum built_in_function fallback_fn = BUILT_IN_NONE;

  if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);

  switch (DECL_FUNCTION_CODE (fndecl))
    {
    CASE_FLT_FN (BUILT_IN_IRINT):
      fallback_fn = BUILT_IN_LRINT;
      gcc_fallthrough ();
    CASE_FLT_FN (BUILT_IN_LRINT):
    CASE_FLT_FN (BUILT_IN_LLRINT):
      builtin_optab = lrint_optab;
      break;

    CASE_FLT_FN (BUILT_IN_IROUND):
      fallback_fn = BUILT_IN_LROUND;
      gcc_fallthrough ();
    CASE_FLT_FN (BUILT_IN_LROUND):
    CASE_FLT_FN (BUILT_IN_LLROUND):
      builtin_optab = lround_optab;
      break;

    default:
      gcc_unreachable ();
    }

  /* There's no easy way to detect the case we need to set EDOM.  */
  if (flag_errno_math && fallback_fn == BUILT_IN_NONE)
    return NULL_RTX;

  /* Make a suitable register to place result in.  */
  mode = TYPE_MODE (TREE_TYPE (exp));

  /* There's no easy way to detect the case we need to set EDOM.  */
  if (!flag_errno_math)
    {
      rtx result = gen_reg_rtx (mode);

      /* Wrap the computation of the argument in a SAVE_EXPR, as we may
	 need to expand the argument again.  This way, we will not perform
	 side-effects more the once.  */
      CALL_EXPR_ARG (exp, 0) = arg = builtin_save_expr (arg);

      op0 = expand_expr (arg, NULL, VOIDmode, EXPAND_NORMAL);

      start_sequence ();

      if (expand_sfix_optab (result, op0, builtin_optab))
	{
	  /* Output the entire sequence.  */
	  insns = get_insns ();
	  end_sequence ();
	  emit_insn (insns);
	  return result;
	}

      /* If we were unable to expand via the builtin, stop the sequence
	 (without outputting the insns) and call to the library function
	 with the stabilized argument list.  */
      end_sequence ();
    }

  if (fallback_fn != BUILT_IN_NONE)
    {
      /* Fall back to rounding to long int.  Use implicit_p 0 - for non-C99
	 targets, (int) round (x) should never be transformed into
	 BUILT_IN_IROUND and if __builtin_iround is called directly, emit
	 a call to lround in the hope that the target provides at least some
	 C99 functions.  This should result in the best user experience for
	 not full C99 targets.  */
      tree fallback_fndecl = mathfn_built_in_1
	(TREE_TYPE (arg), as_combined_fn (fallback_fn), 0);

      exp = build_call_nofold_loc (EXPR_LOCATION (exp),
				   fallback_fndecl, 1, arg);

      target = expand_call (exp, NULL_RTX, target == const0_rtx);
      target = maybe_emit_group_store (target, TREE_TYPE (exp));
      return convert_to_mode (mode, target, 0);
    }

  return expand_call (exp, target, target == const0_rtx);
}

/* Expand a call to the powi built-in mathematical function.  Return NULL_RTX if
   a normal call should be emitted rather than expanding the function
   in-line.  EXP is the expression that is a call to the builtin
   function; if convenient, the result should be placed in TARGET.  */

static rtx
expand_builtin_powi (tree exp, rtx target)
{
  tree arg0, arg1;
  rtx op0, op1;
  machine_mode mode;
  machine_mode mode2;

  if (! validate_arglist (exp, REAL_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg0 = CALL_EXPR_ARG (exp, 0);
  arg1 = CALL_EXPR_ARG (exp, 1);
  mode = TYPE_MODE (TREE_TYPE (exp));

  /* Emit a libcall to libgcc.  */

  /* Mode of the 2nd argument must match that of an int.  */
  mode2 = int_mode_for_size (INT_TYPE_SIZE, 0).require ();

  if (target == NULL_RTX)
    target = gen_reg_rtx (mode);

  op0 = expand_expr (arg0, NULL_RTX, mode, EXPAND_NORMAL);
  if (GET_MODE (op0) != mode)
    op0 = convert_to_mode (mode, op0, 0);
  op1 = expand_expr (arg1, NULL_RTX, mode2, EXPAND_NORMAL);
  if (GET_MODE (op1) != mode2)
    op1 = convert_to_mode (mode2, op1, 0);

  target = emit_library_call_value (optab_libfunc (powi_optab, mode),
				    target, LCT_CONST, mode,
				    op0, mode, op1, mode2);

  return target;
}

/* Expand expression EXP which is a call to the strlen builtin.  Return
   NULL_RTX if we failed and the caller should emit a normal call, otherwise
   try to get the result in TARGET, if convenient.  */

static rtx
expand_builtin_strlen (tree exp, rtx target,
		       machine_mode target_mode)
{
  if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree src = CALL_EXPR_ARG (exp, 0);
  if (!check_read_access (exp, src))
    return NULL_RTX;

  /* If the length can be computed at compile-time, return it.  */
  if (tree len = c_strlen (src, 0))
    return expand_expr (len, target, target_mode, EXPAND_NORMAL);

  /* If the length can be computed at compile-time and is constant
     integer, but there are side-effects in src, evaluate
     src for side-effects, then return len.
     E.g. x = strlen (i++ ? "xfoo" + 1 : "bar");
     can be optimized into: i++; x = 3;  */
  tree len = c_strlen (src, 1);
  if (len && TREE_CODE (len) == INTEGER_CST)
    {
      expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
      return expand_expr (len, target, target_mode, EXPAND_NORMAL);
    }

  unsigned int align = get_pointer_alignment (src) / BITS_PER_UNIT;

  /* If SRC is not a pointer type, don't do this operation inline.  */
  if (align == 0)
    return NULL_RTX;

  /* Bail out if we can't compute strlen in the right mode.  */
  machine_mode insn_mode;
  enum insn_code icode = CODE_FOR_nothing;
  FOR_EACH_MODE_FROM (insn_mode, target_mode)
    {
      icode = optab_handler (strlen_optab, insn_mode);
      if (icode != CODE_FOR_nothing)
	break;
    }
  if (insn_mode == VOIDmode)
    return NULL_RTX;

  /* Make a place to hold the source address.  We will not expand
     the actual source until we are sure that the expansion will
     not fail -- there are trees that cannot be expanded twice.  */
  rtx src_reg = gen_reg_rtx (Pmode);

  /* Mark the beginning of the strlen sequence so we can emit the
     source operand later.  */
  rtx_insn *before_strlen = get_last_insn ();

  class expand_operand ops[4];
  create_output_operand (&ops[0], target, insn_mode);
  create_fixed_operand (&ops[1], gen_rtx_MEM (BLKmode, src_reg));
  create_integer_operand (&ops[2], 0);
  create_integer_operand (&ops[3], align);
  if (!maybe_expand_insn (icode, 4, ops))
    return NULL_RTX;

  /* Check to see if the argument was declared attribute nonstring
     and if so, issue a warning since at this point it's not known
     to be nul-terminated.  */
  maybe_warn_nonstring_arg (get_callee_fndecl (exp), exp);

  /* Now that we are assured of success, expand the source.  */
  start_sequence ();
  rtx pat = expand_expr (src, src_reg, Pmode, EXPAND_NORMAL);
  if (pat != src_reg)
    {
#ifdef POINTERS_EXTEND_UNSIGNED
      if (GET_MODE (pat) != Pmode)
	pat = convert_to_mode (Pmode, pat,
			       POINTERS_EXTEND_UNSIGNED);
#endif
      emit_move_insn (src_reg, pat);
    }
  pat = get_insns ();
  end_sequence ();

  if (before_strlen)
    emit_insn_after (pat, before_strlen);
  else
    emit_insn_before (pat, get_insns ());

  /* Return the value in the proper mode for this function.  */
  if (GET_MODE (ops[0].value) == target_mode)
    target = ops[0].value;
  else if (target != 0)
    convert_move (target, ops[0].value, 0);
  else
    target = convert_to_mode (target_mode, ops[0].value, 0);

  return target;
}

/* Expand call EXP to the strnlen built-in, returning the result
   and setting it in TARGET.  Otherwise return NULL_RTX on failure.  */

static rtx
expand_builtin_strnlen (tree exp, rtx target, machine_mode target_mode)
{
  if (!validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree src = CALL_EXPR_ARG (exp, 0);
  tree bound = CALL_EXPR_ARG (exp, 1);

  if (!bound)
    return NULL_RTX;

  check_read_access (exp, src, bound);

  location_t loc = UNKNOWN_LOCATION;
  if (EXPR_HAS_LOCATION (exp))
    loc = EXPR_LOCATION (exp);

  /* FIXME: Change c_strlen() to return sizetype instead of ssizetype
     so these conversions aren't necessary.  */
  c_strlen_data lendata = { };
  tree len = c_strlen (src, 0, &lendata, 1);
  if (len)
    len = fold_convert_loc (loc, TREE_TYPE (bound), len);

  if (TREE_CODE (bound) == INTEGER_CST)
    {
      if (!len)
	return NULL_RTX;

      len = fold_build2_loc (loc, MIN_EXPR, size_type_node, len, bound);
      return expand_expr (len, target, target_mode, EXPAND_NORMAL);
    }

  if (TREE_CODE (bound) != SSA_NAME)
    return NULL_RTX;

  wide_int min, max;
  enum value_range_kind rng = get_range_info (bound, &min, &max);
  if (rng != VR_RANGE)
    return NULL_RTX;

  if (!len || TREE_CODE (len) != INTEGER_CST)
    {
      bool exact;
      lendata.decl = unterminated_array (src, &len, &exact);
      if (!lendata.decl)
	return NULL_RTX;
    }

  if (lendata.decl)
    return NULL_RTX;

  if (wi::gtu_p (min, wi::to_wide (len)))
    return expand_expr (len, target, target_mode, EXPAND_NORMAL);

  len = fold_build2_loc (loc, MIN_EXPR, TREE_TYPE (len), len, bound);
  return expand_expr (len, target, target_mode, EXPAND_NORMAL);
}

/* Callback routine for store_by_pieces.  Read GET_MODE_BITSIZE (MODE)
   bytes from bytes at DATA + OFFSET and return it reinterpreted as
   a target constant.  */

static rtx
builtin_memcpy_read_str (void *data, void *, HOST_WIDE_INT offset,
			 scalar_int_mode mode)
{
  /* The REPresentation pointed to by DATA need not be a nul-terminated
     string but the caller guarantees it's large enough for MODE.  */
  const char *rep = (const char *) data;

  return c_readstr (rep + offset, mode, /*nul_terminated=*/false);
}

/* LEN specify length of the block of memcpy/memset operation.
   Figure out its range and put it into MIN_SIZE/MAX_SIZE. 
   In some cases we can make very likely guess on max size, then we
   set it into PROBABLE_MAX_SIZE.  */

static void
determine_block_size (tree len, rtx len_rtx,
		      unsigned HOST_WIDE_INT *min_size,
		      unsigned HOST_WIDE_INT *max_size,
		      unsigned HOST_WIDE_INT *probable_max_size)
{
  if (CONST_INT_P (len_rtx))
    {
      *min_size = *max_size = *probable_max_size = UINTVAL (len_rtx);
      return;
    }
  else
    {
      wide_int min, max;
      enum value_range_kind range_type = VR_UNDEFINED;

      /* Determine bounds from the type.  */
      if (tree_fits_uhwi_p (TYPE_MIN_VALUE (TREE_TYPE (len))))
	*min_size = tree_to_uhwi (TYPE_MIN_VALUE (TREE_TYPE (len)));
      else
	*min_size = 0;
      if (tree_fits_uhwi_p (TYPE_MAX_VALUE (TREE_TYPE (len))))
	*probable_max_size = *max_size
	  = tree_to_uhwi (TYPE_MAX_VALUE (TREE_TYPE (len)));
      else
	*probable_max_size = *max_size = GET_MODE_MASK (GET_MODE (len_rtx));

      if (TREE_CODE (len) == SSA_NAME)
	range_type = get_range_info (len, &min, &max);
      if (range_type == VR_RANGE)
	{
	  if (wi::fits_uhwi_p (min) && *min_size < min.to_uhwi ())
	    *min_size = min.to_uhwi ();
	  if (wi::fits_uhwi_p (max) && *max_size > max.to_uhwi ())
	    *probable_max_size = *max_size = max.to_uhwi ();
	}
      else if (range_type == VR_ANTI_RANGE)
	{
	  /* Code like

	     int n;
	     if (n < 100)
	       memcpy (a, b, n)

	     Produce anti range allowing negative values of N.  We still
	     can use the information and make a guess that N is not negative.
	     */
	  if (!wi::leu_p (max, 1 << 30) && wi::fits_uhwi_p (min))
	    *probable_max_size = min.to_uhwi () - 1;
	}
    }
  gcc_checking_assert (*max_size <=
		       (unsigned HOST_WIDE_INT)
			  GET_MODE_MASK (GET_MODE (len_rtx)));
}

/* Issue a warning OPT for a bounded call EXP with a bound in RANGE
   accessing an object with SIZE.  */

static bool
maybe_warn_for_bound (int opt, location_t loc, tree exp, tree func,
		      tree bndrng[2], tree size, const access_data *pad = NULL)
{
  if (!bndrng[0] || TREE_NO_WARNING (exp))
    return false;

  tree maxobjsize = max_object_size ();

  bool warned = false;

  if (opt == OPT_Wstringop_overread)
    {
      bool maybe = pad && pad->src.phi ();

      if (tree_int_cst_lt (maxobjsize, bndrng[0]))
	{
	  if (bndrng[0] == bndrng[1])
	    warned = (func
		      ? warning_at (loc, opt,
				    (maybe
				     ? G_("%K%qD specified bound %E may "
					  "exceed maximum object size %E")
				     : G_("%K%qD specified bound %E "
					  "exceeds maximum object size %E")),
				    exp, func, bndrng[0], maxobjsize)
		      : warning_at (loc, opt,
				    (maybe
				     ? G_("%Kspecified bound %E may "
					  "exceed maximum object size %E")
				     : G_("%Kspecified bound %E "
					  "exceeds maximum object size %E")),
				    exp, bndrng[0], maxobjsize));
	  else
	    warned = (func
		      ? warning_at (loc, opt,
				    (maybe
				     ? G_("%K%qD specified bound [%E, %E] may "
					  "exceed maximum object size %E")
				     : G_("%K%qD specified bound [%E, %E] "
					  "exceeds maximum object size %E")),
				    exp, func,
				    bndrng[0], bndrng[1], maxobjsize)
		      : warning_at (loc, opt,
				    (maybe
				     ? G_("%Kspecified bound [%E, %E] may "
					  "exceed maximum object size %E")
				     : G_("%Kspecified bound [%E, %E] "
					  "exceeds maximum object size %E")),
				    exp, bndrng[0], bndrng[1], maxobjsize));
	}
      else if (!size || tree_int_cst_le (bndrng[0], size))
	return false;
      else if (tree_int_cst_equal (bndrng[0], bndrng[1]))
	warned = (func
		  ? warning_at (loc, opt,
				(maybe
				 ? G_("%K%qD specified bound %E may exceed "
				      "source size %E")
				 : G_("%K%qD specified bound %E exceeds "
				      "source size %E")),
				exp, func, bndrng[0], size)
		  : warning_at (loc, opt,
				(maybe
				 ? G_("%Kspecified bound %E may exceed "
				      "source size %E")
				 : G_("%Kspecified bound %E exceeds "
				      "source size %E")),
				exp, bndrng[0], size));
      else
	warned = (func
		  ? warning_at (loc, opt,
				(maybe
				 ? G_("%K%qD specified bound [%E, %E] may "
				      "exceed source size %E")
				 : G_("%K%qD specified bound [%E, %E] exceeds "
				      "source size %E")),
				exp, func, bndrng[0], bndrng[1], size)
		  : warning_at (loc, opt,
				(maybe
				 ? G_("%Kspecified bound [%E, %E] may exceed "
				      "source size %E")
				 : G_("%Kspecified bound [%E, %E] exceeds "
				      "source size %E")),
				exp, bndrng[0], bndrng[1], size));
      if (warned)
	{
	  if (pad && pad->src.ref)
	    {
	      if (DECL_P (pad->src.ref))
		inform (DECL_SOURCE_LOCATION (pad->src.ref),
			"source object declared here");
	      else if (EXPR_HAS_LOCATION (pad->src.ref))
		inform (EXPR_LOCATION (pad->src.ref),
			"source object allocated here");
	    }
	  TREE_NO_WARNING (exp) = true;
	}

      return warned;
    }

  bool maybe = pad && pad->dst.phi ();
  if (tree_int_cst_lt (maxobjsize, bndrng[0]))
    {
      if (bndrng[0] == bndrng[1])
	warned = (func
		  ? warning_at (loc, opt,
				(maybe
				 ? G_("%K%qD specified size %E may "
				      "exceed maximum object size %E")
				 : G_("%K%qD specified size %E "
				      "exceeds maximum object size %E")),
				exp, func, bndrng[0], maxobjsize)
		  : warning_at (loc, opt,
				(maybe
				 ? G_("%Kspecified size %E may exceed "
				      "maximum object size %E")
				 : G_("%Kspecified size %E exceeds "
				      "maximum object size %E")),
				exp, bndrng[0], maxobjsize));
      else
	warned = (func
		  ? warning_at (loc, opt,
				(maybe
				 ? G_("%K%qD specified size between %E and %E "
				      "may exceed maximum object size %E")
				 : G_("%K%qD specified size between %E and %E "
				      "exceeds maximum object size %E")),
				exp, func,
				bndrng[0], bndrng[1], maxobjsize)
		  : warning_at (loc, opt,
				(maybe
				 ? G_("%Kspecified size between %E and %E "
				      "may exceed maximum object size %E")
				 : G_("%Kspecified size between %E and %E "
				      "exceeds maximum object size %E")),
				exp, bndrng[0], bndrng[1], maxobjsize));
    }
  else if (!size || tree_int_cst_le (bndrng[0], size))
    return false;
  else if (tree_int_cst_equal (bndrng[0], bndrng[1]))
    warned = (func
	      ? warning_at (loc, OPT_Wstringop_overflow_,
			    (maybe
			     ? G_("%K%qD specified bound %E may exceed "
				  "destination size %E")
			     : G_("%K%qD specified bound %E exceeds "
				  "destination size %E")),
			    exp, func, bndrng[0], size)
	      : warning_at (loc, OPT_Wstringop_overflow_,
			    (maybe
			     ? G_("%Kspecified bound %E may exceed "
				  "destination size %E")
			     : G_("%Kspecified bound %E exceeds "
				  "destination size %E")),
			    exp, bndrng[0], size));
  else
    warned = (func
	      ? warning_at (loc, OPT_Wstringop_overflow_,
			    (maybe
			     ? G_("%K%qD specified bound [%E, %E] may exceed "
				  "destination size %E")
			     : G_("%K%qD specified bound [%E, %E] exceeds "
				  "destination size %E")),
			    exp, func, bndrng[0], bndrng[1], size)
	      : warning_at (loc, OPT_Wstringop_overflow_,
			    (maybe
			     ? G_("%Kspecified bound [%E, %E] exceeds "
				  "destination size %E")
			     : G_("%Kspecified bound [%E, %E] exceeds "
				  "destination size %E")),
			    exp, bndrng[0], bndrng[1], size));

  if (warned)
    {
      if (pad && pad->dst.ref)
	{
	  if (DECL_P (pad->dst.ref))
	    inform (DECL_SOURCE_LOCATION (pad->dst.ref),
		    "destination object declared here");
	  else if (EXPR_HAS_LOCATION (pad->dst.ref))
	    inform (EXPR_LOCATION (pad->dst.ref),
		    "destination object allocated here");
	}
      TREE_NO_WARNING (exp) = true;
    }

  return warned;
}

/* For an expression EXP issue an access warning controlled by option OPT
   with access to a region SIZE bytes in size in the RANGE of sizes.
   WRITE is true for a write access, READ for a read access, neither for
   call that may or may not perform an access but for which the range
   is expected to valid.
   Returns true when a warning has been issued.  */

static bool
warn_for_access (location_t loc, tree func, tree exp, int opt, tree range[2],
		 tree size, bool write, bool read, bool maybe)
{
  bool warned = false;

  if (write && read)
    {
      if (tree_int_cst_equal (range[0], range[1]))
	warned = (func
		  ? warning_n (loc, opt, tree_to_uhwi (range[0]),
			       (maybe
				? G_("%K%qD may access %E byte in a region "
				     "of size %E")
				: G_("%K%qD accessing %E byte in a region "
				     "of size %E")),
				(maybe
				 ? G_ ("%K%qD may access %E bytes in a region "
				       "of size %E")
				 : G_ ("%K%qD accessing %E bytes in a region "
				       "of size %E")),
			       exp, func, range[0], size)
		  : warning_n (loc, opt, tree_to_uhwi (range[0]),
			       (maybe
				? G_("%Kmay access %E byte in a region "
				     "of size %E")
				: G_("%Kaccessing %E byte in a region "
				     "of size %E")),
			       (maybe
				? G_("%Kmay access %E bytes in a region "
				     "of size %E")
				: G_("%Kaccessing %E bytes in a region "
				     "of size %E")),
			       exp, range[0], size));
      else if (tree_int_cst_sign_bit (range[1]))
	{
	  /* Avoid printing the upper bound if it's invalid.  */
	  warned = (func
		    ? warning_at (loc, opt,
				  (maybe
				   ? G_("%K%qD may access %E or more bytes "
					"in a region of size %E")
				   : G_("%K%qD accessing %E or more bytes "
					"in a region of size %E")),
				  exp, func, range[0], size)
		    : warning_at (loc, opt,
				  (maybe
				   ? G_("%Kmay access %E or more bytes "
					"in a region of size %E")
				   : G_("%Kaccessing %E or more bytes "
					"in a region of size %E")),
				  exp, range[0], size));
	}
      else
	warned = (func
		  ? warning_at (loc, opt,
				(maybe
				 ? G_("%K%qD may access between %E and %E "
				      "bytes in a region of size %E")
				 : G_("%K%qD accessing between %E and %E "
				      "bytes in a region of size %E")),
				exp, func, range[0], range[1],
				size)
		  : warning_at (loc, opt,
				(maybe
				 ? G_("%Kmay access between %E and %E bytes "
				      "in a region of size %E")
				 : G_("%Kaccessing between %E and %E bytes "
				      "in a region of size %E")),
				exp, range[0], range[1],
				size));
      return warned;
    }

  if (write)
    {
      if (tree_int_cst_equal (range[0], range[1]))
	warned = (func
		  ? warning_n (loc, opt, tree_to_uhwi (range[0]),
			       (maybe
				? G_("%K%qD may write %E byte into a region "
				     "of size %E")
				: G_("%K%qD writing %E byte into a region "
				     "of size %E overflows the destination")),
			       (maybe
				? G_("%K%qD may write %E bytes into a region "
				     "of size %E")
				: G_("%K%qD writing %E bytes into a region "
				     "of size %E overflows the destination")),
			       exp, func, range[0], size)
		  : warning_n (loc, opt, tree_to_uhwi (range[0]),
			       (maybe
				? G_("%Kmay write %E byte into a region "
				     "of size %E")
				: G_("%Kwriting %E byte into a region "
				     "of size %E overflows the destination")),
			       (maybe
				? G_("%Kmay write %E bytes into a region "
				     "of size %E")
				: G_("%Kwriting %E bytes into a region "
				     "of size %E overflows the destination")),
			       exp, range[0], size));
      else if (tree_int_cst_sign_bit (range[1]))
	{
	  /* Avoid printing the upper bound if it's invalid.  */
	  warned = (func
		    ? warning_at (loc, opt,
				  (maybe
				   ? G_("%K%qD may write %E or more bytes "
					"into a region of size %E")
				   : G_("%K%qD writing %E or more bytes "
					"into a region of size %E overflows "
					"the destination")),
				  exp, func, range[0], size)
		    : warning_at (loc, opt,
				  (maybe
				   ? G_("%Kmay write %E or more bytes into "
					"a region of size %E")
				   : G_("%Kwriting %E or more bytes into "
					"a region of size %E overflows "
					"the destination")),
				  exp, range[0], size));
	}
      else
	warned = (func
		  ? warning_at (loc, opt,
				(maybe
				 ? G_("%K%qD may write between %E and %E bytes "
				      "into a region of size %E")
				 : G_("%K%qD writing between %E and %E bytes "
				      "into a region of size %E overflows "
				      "the destination")),
				exp, func, range[0], range[1],
				size)
		  : warning_at (loc, opt,
				(maybe
				 ? G_("%Kmay write between %E and %E bytes "
				      "into a region of size %E")
				 : G_("%Kwriting between %E and %E bytes "
				      "into a region of size %E overflows "
				      "the destination")),
				exp, range[0], range[1],
				size));
      return warned;
    }

  if (read)
    {
      if (tree_int_cst_equal (range[0], range[1]))
	warned = (func
		  ? warning_n (loc, OPT_Wstringop_overread,
			       tree_to_uhwi (range[0]),
			       (maybe
				? G_("%K%qD may read %E byte from a region "
				     "of size %E")
				: G_("%K%qD reading %E byte from a region "
				     "of size %E")),
			       (maybe
				? G_("%K%qD may read %E bytes from a region "
				     "of size %E")
				: G_("%K%qD reading %E bytes from a region "
				     "of size %E")),
			       exp, func, range[0], size)
		  : warning_n (loc, OPT_Wstringop_overread,
			       tree_to_uhwi (range[0]),
			       (maybe
				? G_("%Kmay read %E byte from a region "
				     "of size %E")
				: G_("%Kreading %E byte from a region "
				     "of size %E")),
			       (maybe
				? G_("%Kmay read %E bytes from a region "
				     "of size %E")
				: G_("%Kreading %E bytes from a region "
				     "of size %E")),
			       exp, range[0], size));
      else if (tree_int_cst_sign_bit (range[1]))
	{
	  /* Avoid printing the upper bound if it's invalid.  */
	  warned = (func
		    ? warning_at (loc, OPT_Wstringop_overread,
				  (maybe
				   ? G_("%K%qD may read %E or more bytes "
					"from a region of size %E")
				   : G_("%K%qD reading %E or more bytes "
					"from a region of size %E")),
				  exp, func, range[0], size)
		    : warning_at (loc, OPT_Wstringop_overread,
				  (maybe
				   ? G_("%Kmay read %E or more bytes "
					"from a region of size %E")
				   : G_("%Kreading %E or more bytes "
					"from a region of size %E")),
				  exp, range[0], size));
	}
      else
	warned = (func
		  ? warning_at (loc, OPT_Wstringop_overread,
				(maybe
				 ? G_("%K%qD may read between %E and %E bytes "
				      "from a region of size %E")
				 : G_("%K%qD reading between %E and %E bytes "
				      "from a region of size %E")),
				exp, func, range[0], range[1], size)
		  : warning_at (loc, opt,
				(maybe
				 ? G_("%Kmay read between %E and %E bytes "
				      "from a region of size %E")
				 : G_("%Kreading between %E and %E bytes "
				      "from a region of size %E")),
				exp, range[0], range[1], size));

      if (warned)
	TREE_NO_WARNING (exp) = true;

      return warned;
    }

  if (tree_int_cst_equal (range[0], range[1])
      || tree_int_cst_sign_bit (range[1]))
    warned = (func
	      ? warning_n (loc, OPT_Wstringop_overread,
			   tree_to_uhwi (range[0]),
			   "%K%qD expecting %E byte in a region of size %E",
			   "%K%qD expecting %E bytes in a region of size %E",
			   exp, func, range[0], size)
	      : warning_n (loc, OPT_Wstringop_overread,
			   tree_to_uhwi (range[0]),
			   "%Kexpecting %E byte in a region of size %E",
			   "%Kexpecting %E bytes in a region of size %E",
			   exp, range[0], size));
  else if (tree_int_cst_sign_bit (range[1]))
    {
      /* Avoid printing the upper bound if it's invalid.  */
      warned = (func
		? warning_at (loc, OPT_Wstringop_overread,
			      "%K%qD expecting %E or more bytes in a region "
			      "of size %E",
			      exp, func, range[0], size)
		: warning_at (loc, OPT_Wstringop_overread,
			      "%Kexpecting %E or more bytes in a region "
			      "of size %E",
			      exp, range[0], size));
    }
  else
    warned = (func
	      ? warning_at (loc, OPT_Wstringop_overread,
			    "%K%qD expecting between %E and %E bytes in "
			    "a region of size %E",
			    exp, func, range[0], range[1], size)
	      : warning_at (loc, OPT_Wstringop_overread,
			    "%Kexpecting between %E and %E bytes in "
			    "a region of size %E",
			    exp, range[0], range[1], size));

  if (warned)
    TREE_NO_WARNING (exp) = true;

  return warned;
}

/* Issue one inform message describing each target of an access REF.
   WRITE is set for a write access and clear for a read access.  */

void
access_ref::inform_access (access_mode mode) const
{
  const access_ref &aref = *this;
  if (!aref.ref)
    return;

  if (aref.phi ())
    {
      /* Set MAXREF to refer to the largest object and fill ALL_REFS
	 with data for all objects referenced by the PHI arguments.  */
      access_ref maxref;
      auto_vec<access_ref> all_refs;
      if (!get_ref (&all_refs, &maxref))
	return;

      /* Except for MAXREF, the rest of the arguments' offsets need not
	 reflect one added to the PHI itself.  Determine the latter from
	 MAXREF on which the result is based.  */
      const offset_int orng[] =
	{
	  offrng[0] - maxref.offrng[0],
	  wi::smax (offrng[1] - maxref.offrng[1], offrng[0]),
	};

      /* Add the final PHI's offset to that of each of the arguments
	 and recurse to issue an inform message for it.  */
      for (unsigned i = 0; i != all_refs.length (); ++i)
	{
	  /* Skip any PHIs; those could lead to infinite recursion.  */
	  if (all_refs[i].phi ())
	    continue;

	  all_refs[i].add_offset (orng[0], orng[1]);
	  all_refs[i].inform_access (mode);
	}
      return;
    }

  /* Convert offset range and avoid including a zero range since it
     isn't necessarily meaningful.  */
  HOST_WIDE_INT diff_min = tree_to_shwi (TYPE_MIN_VALUE (ptrdiff_type_node));
  HOST_WIDE_INT diff_max = tree_to_shwi (TYPE_MAX_VALUE (ptrdiff_type_node));
  HOST_WIDE_INT minoff;
  HOST_WIDE_INT maxoff = diff_max;
  if (wi::fits_shwi_p (aref.offrng[0]))
    minoff = aref.offrng[0].to_shwi ();
  else
    minoff = aref.offrng[0] < 0 ? diff_min : diff_max;

  if (wi::fits_shwi_p (aref.offrng[1]))
    maxoff = aref.offrng[1].to_shwi ();

  if (maxoff <= diff_min || maxoff >= diff_max)
    /* Avoid mentioning an upper bound that's equal to or in excess
       of the maximum of ptrdiff_t.  */
    maxoff = minoff;

  /* Convert size range and always include it since all sizes are
     meaningful. */
  unsigned long long minsize = 0, maxsize = 0;
  if (wi::fits_shwi_p (aref.sizrng[0])
      && wi::fits_shwi_p (aref.sizrng[1]))
    {
      minsize = aref.sizrng[0].to_shwi ();
      maxsize = aref.sizrng[1].to_shwi ();
    }

  /* SIZRNG doesn't necessarily have the same range as the allocation
     size determined by gimple_call_alloc_size ().  */
  char sizestr[80];
  if (minsize == maxsize)
    sprintf (sizestr, "%llu", minsize);
  else
    sprintf (sizestr, "[%llu, %llu]", minsize, maxsize);

  char offstr[80];
  if (minoff == 0
      && (maxoff == 0 || aref.sizrng[1] <= maxoff))
    offstr[0] = '\0';
  else if (minoff == maxoff)
    sprintf (offstr, "%lli", (long long) minoff);
  else
    sprintf (offstr, "[%lli, %lli]", (long long) minoff, (long long) maxoff);

  location_t loc = UNKNOWN_LOCATION;

  tree ref = this->ref;
  tree allocfn = NULL_TREE;
  if (TREE_CODE (ref) == SSA_NAME)
    {
      gimple *stmt = SSA_NAME_DEF_STMT (ref);
      if (is_gimple_call (stmt))
	{
	  loc = gimple_location (stmt);
	  if (gimple_call_builtin_p (stmt, BUILT_IN_ALLOCA_WITH_ALIGN))
	    {
	      /* Strip the SSA_NAME suffix from the variable name and
		 recreate an identifier with the VLA's original name.  */
	      ref = gimple_call_lhs (stmt);
	      if (SSA_NAME_IDENTIFIER (ref))
		{
		  ref = SSA_NAME_IDENTIFIER (ref);
		  const char *id = IDENTIFIER_POINTER (ref);
		  size_t len = strcspn (id, ".$");
		  if (!len)
		    len = strlen (id);
		  ref = get_identifier_with_length (id, len);
		}
	    }
	  else
	    {
	      /* Except for VLAs, retrieve the allocation function.  */
	      allocfn = gimple_call_fndecl (stmt);
	      if (!allocfn)
		allocfn = gimple_call_fn (stmt);
	      if (TREE_CODE (allocfn) == SSA_NAME)
		{
		  /* For an ALLOC_CALL via a function pointer make a small
		     effort to determine the destination of the pointer.  */
		  gimple *def = SSA_NAME_DEF_STMT (allocfn);
		  if (gimple_assign_single_p (def))
		    {
		      tree rhs = gimple_assign_rhs1 (def);
		      if (DECL_P (rhs))
			allocfn = rhs;
		      else if (TREE_CODE (rhs) == COMPONENT_REF)
			allocfn = TREE_OPERAND (rhs, 1);
		    }
		}
	    }
	}
      else if (gimple_nop_p (stmt))
	/* Handle DECL_PARM below.  */
	ref = SSA_NAME_VAR (ref);
    }

  if (DECL_P (ref))
    loc = DECL_SOURCE_LOCATION (ref);
  else if (EXPR_P (ref) && EXPR_HAS_LOCATION (ref))
    loc = EXPR_LOCATION (ref);
  else if (TREE_CODE (ref) != IDENTIFIER_NODE
	   && TREE_CODE (ref) != SSA_NAME)
    return;

  if (mode == access_read_write || mode == access_write_only)
    {
      if (allocfn == NULL_TREE)
	{
	  if (*offstr)
	    inform (loc, "at offset %s into destination object %qE of size %s",
		    offstr, ref, sizestr);
	  else
	    inform (loc, "destination object %qE of size %s", ref, sizestr);
	  return;
	}

      if (*offstr)
	inform (loc,
		"at offset %s into destination object of size %s "
		"allocated by %qE", offstr, sizestr, allocfn);
      else
	inform (loc, "destination object of size %s allocated by %qE",
		sizestr, allocfn);
      return;
    }

  if (allocfn == NULL_TREE)
    {
      if (*offstr)
	inform (loc, "at offset %s into source object %qE of size %s",
		offstr, ref, sizestr);
      else
	inform (loc, "source object %qE of size %s", ref, sizestr);

      return;
    }

  if (*offstr)
    inform (loc,
	    "at offset %s into source object of size %s allocated by %qE",
	    offstr, sizestr, allocfn);
  else
    inform (loc, "source object of size %s allocated by %qE",
	    sizestr, allocfn);
}

/* Helper to set RANGE to the range of BOUND if it's nonnull, bounded
   by BNDRNG if nonnull and valid.  */

static void
get_size_range (tree bound, tree range[2], const offset_int bndrng[2])
{
  if (bound)
    get_size_range (bound, range);

  if (!bndrng || (bndrng[0] == 0 && bndrng[1] == HOST_WIDE_INT_M1U))
    return;

  if (range[0] && TREE_CODE (range[0]) == INTEGER_CST)
    {
      offset_int r[] =
	{ wi::to_offset (range[0]), wi::to_offset (range[1]) };
      if (r[0] < bndrng[0])
	range[0] = wide_int_to_tree (sizetype, bndrng[0]);
      if (bndrng[1] < r[1])
	range[1] = wide_int_to_tree (sizetype, bndrng[1]);
    }
  else
    {
      range[0] = wide_int_to_tree (sizetype, bndrng[0]);
      range[1] = wide_int_to_tree (sizetype, bndrng[1]);
    }
}

/* Try to verify that the sizes and lengths of the arguments to a string
   manipulation function given by EXP are within valid bounds and that
   the operation does not lead to buffer overflow or read past the end.
   Arguments other than EXP may be null.  When non-null, the arguments
   have the following meaning:
   DST is the destination of a copy call or NULL otherwise.
   SRC is the source of a copy call or NULL otherwise.
   DSTWRITE is the number of bytes written into the destination obtained
   from the user-supplied size argument to the function (such as in
   memcpy(DST, SRCs, DSTWRITE) or strncpy(DST, DRC, DSTWRITE).
   MAXREAD is the user-supplied bound on the length of the source sequence
   (such as in strncat(d, s, N).  It specifies the upper limit on the number
   of bytes to write.  If NULL, it's taken to be the same as DSTWRITE.
   SRCSTR is the source string (such as in strcpy(DST, SRC)) when the
   expression EXP is a string function call (as opposed to a memory call
   like memcpy).  As an exception, SRCSTR can also be an integer denoting
   the precomputed size of the source string or object (for functions like
   memcpy).
   DSTSIZE is the size of the destination object.

   When DSTWRITE is null LEN is checked to verify that it doesn't exceed
   SIZE_MAX.

   WRITE is true for write accesses, READ is true for reads.  Both are
   false for simple size checks in calls to functions that neither read
   from nor write to the region.

   When nonnull, PAD points to a more detailed description of the access.

   If the call is successfully verified as safe return true, otherwise
   return false.  */

bool
check_access (tree exp, tree dstwrite,
	      tree maxread, tree srcstr, tree dstsize,
	      access_mode mode, const access_data *pad /* = NULL */)
{
  /* The size of the largest object is half the address space, or
     PTRDIFF_MAX.  (This is way too permissive.)  */
  tree maxobjsize = max_object_size ();

  /* Either an approximate/minimum the length of the source string for
     string functions or the size of the source object for raw memory
     functions.  */
  tree slen = NULL_TREE;

  /* The range of the access in bytes; first set to the write access
     for functions that write and then read for those that also (or
     just) read.  */
  tree range[2] = { NULL_TREE, NULL_TREE };

  /* Set to true when the exact number of bytes written by a string
     function like strcpy is not known and the only thing that is
     known is that it must be at least one (for the terminating nul).  */
  bool at_least_one = false;
  if (srcstr)
    {
      /* SRCSTR is normally a pointer to string but as a special case
	 it can be an integer denoting the length of a string.  */
      if (POINTER_TYPE_P (TREE_TYPE (srcstr)))
	{
	  if (!check_nul_terminated_array (exp, srcstr, maxread))
	    return false;
	  /* Try to determine the range of lengths the source string
	     refers to.  If it can be determined and is less than
	     the upper bound given by MAXREAD add one to it for
	     the terminating nul.  Otherwise, set it to one for
	     the same reason, or to MAXREAD as appropriate.  */
	  c_strlen_data lendata = { };
	  get_range_strlen (srcstr, &lendata, /* eltsize = */ 1);
	  range[0] = lendata.minlen;
	  range[1] = lendata.maxbound ? lendata.maxbound : lendata.maxlen;
	  if (range[0]
	      && TREE_CODE (range[0]) == INTEGER_CST
	      && TREE_CODE (range[1]) == INTEGER_CST
	      && (!maxread || TREE_CODE (maxread) == INTEGER_CST))
	    {
	      if (maxread && tree_int_cst_le (maxread, range[0]))
		range[0] = range[1] = maxread;
	      else
		range[0] = fold_build2 (PLUS_EXPR, size_type_node,
					range[0], size_one_node);

	      if (maxread && tree_int_cst_le (maxread, range[1]))
		range[1] = maxread;
	      else if (!integer_all_onesp (range[1]))
		range[1] = fold_build2 (PLUS_EXPR, size_type_node,
					range[1], size_one_node);

	      slen = range[0];
	    }
	  else
	    {
	      at_least_one = true;
	      slen = size_one_node;
	    }
	}
      else
	slen = srcstr;
    }

  if (!dstwrite && !maxread)
    {
      /* When the only available piece of data is the object size
	 there is nothing to do.  */
      if (!slen)
	return true;

      /* Otherwise, when the length of the source sequence is known
	 (as with strlen), set DSTWRITE to it.  */
      if (!range[0])
	dstwrite = slen;
    }

  if (!dstsize)
    dstsize = maxobjsize;

  /* Set RANGE to that of DSTWRITE if non-null, bounded by PAD->DST.BNDRNG
     if valid.  */
  get_size_range (dstwrite, range, pad ? pad->dst.bndrng : NULL);

  tree func = get_callee_fndecl (exp);
  /* Read vs write access by built-ins can be determined from the const
     qualifiers on the pointer argument.  In the absence of attribute
     access, non-const qualified pointer arguments to user-defined
     functions are assumed to both read and write the objects.  */
  const bool builtin = func ? fndecl_built_in_p (func) : false;

  /* First check the number of bytes to be written against the maximum
     object size.  */
  if (range[0]
      && TREE_CODE (range[0]) == INTEGER_CST
      && tree_int_cst_lt (maxobjsize, range[0]))
    {
      location_t loc = tree_inlined_location (exp);
      maybe_warn_for_bound (OPT_Wstringop_overflow_, loc, exp, func, range,
			    NULL_TREE, pad);
      return false;
    }

  /* The number of bytes to write is "exact" if DSTWRITE is non-null,
     constant, and in range of unsigned HOST_WIDE_INT.  */
  bool exactwrite = dstwrite && tree_fits_uhwi_p (dstwrite);

  /* Next check the number of bytes to be written against the destination
     object size.  */
  if (range[0] || !exactwrite || integer_all_onesp (dstwrite))
    {
      if (range[0]
	  && TREE_CODE (range[0]) == INTEGER_CST
	  && ((tree_fits_uhwi_p (dstsize)
	       && tree_int_cst_lt (dstsize, range[0]))
	      || (dstwrite
		  && tree_fits_uhwi_p (dstwrite)
		  && tree_int_cst_lt (dstwrite, range[0]))))
	{
	  if (TREE_NO_WARNING (exp)
	      || (pad && pad->dst.ref && TREE_NO_WARNING (pad->dst.ref)))
	    return false;

	  location_t loc = tree_inlined_location (exp);
	  bool warned = false;
	  if (dstwrite == slen && at_least_one)
	    {
	      /* This is a call to strcpy with a destination of 0 size
		 and a source of unknown length.  The call will write
		 at least one byte past the end of the destination.  */
	      warned = (func
			? warning_at (loc, OPT_Wstringop_overflow_,
				      "%K%qD writing %E or more bytes into "
				      "a region of size %E overflows "
				      "the destination",
				      exp, func, range[0], dstsize)
			: warning_at (loc, OPT_Wstringop_overflow_,
				      "%Kwriting %E or more bytes into "
				      "a region of size %E overflows "
				      "the destination",
				      exp, range[0], dstsize));
	    }
	  else
	    {
	      const bool read
		= mode == access_read_only || mode == access_read_write;
	      const bool write
		= mode == access_write_only || mode == access_read_write;
	      const bool maybe = pad && pad->dst.parmarray;
	      warned = warn_for_access (loc, func, exp,
					OPT_Wstringop_overflow_,
					range, dstsize,
					write, read && !builtin, maybe);
	    }

	  if (warned)
	    {
	      TREE_NO_WARNING (exp) = true;
	      if (pad)
		pad->dst.inform_access (pad->mode);
	    }

	  /* Return error when an overflow has been detected.  */
	  return false;
	}
    }

  /* Check the maximum length of the source sequence against the size
     of the destination object if known, or against the maximum size
     of an object.  */
  if (maxread)
    {
      /* Set RANGE to that of MAXREAD, bounded by PAD->SRC.BNDRNG if
	 PAD is nonnull and BNDRNG is valid.  */
      get_size_range (maxread, range, pad ? pad->src.bndrng : NULL);

      location_t loc = tree_inlined_location (exp);
      tree size = dstsize;
      if (pad && pad->mode == access_read_only)
	size = wide_int_to_tree (sizetype, pad->src.sizrng[1]);

      if (range[0] && maxread && tree_fits_uhwi_p (size))
	{
	  if (tree_int_cst_lt (maxobjsize, range[0]))
	    {
	      maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp, func,
				    range, size, pad);
	      return false;
	    }

	  if (size != maxobjsize && tree_int_cst_lt (size, range[0]))
	    {
	      int opt = (dstwrite || mode != access_read_only
			 ? OPT_Wstringop_overflow_
			 : OPT_Wstringop_overread);
	      maybe_warn_for_bound (opt, loc, exp, func, range, size, pad);
	      return false;
	    }
	}

      maybe_warn_nonstring_arg (func, exp);
    }

  /* Check for reading past the end of SRC.  */
  bool overread = (slen
		   && slen == srcstr
		   && dstwrite
		   && range[0]
		   && TREE_CODE (slen) == INTEGER_CST
		   && tree_int_cst_lt (slen, range[0]));
  /* If none is determined try to get a better answer based on the details
     in PAD.  */
  if (!overread
      && pad
      && pad->src.sizrng[1] >= 0
      && pad->src.offrng[0] >= 0
      && (pad->src.offrng[1] < 0
	  || pad->src.offrng[0] <= pad->src.offrng[1]))
    {
      /* Set RANGE to that of MAXREAD, bounded by PAD->SRC.BNDRNG if
	 PAD is nonnull and BNDRNG is valid.  */
      get_size_range (maxread, range, pad ? pad->src.bndrng : NULL);
      /* Set OVERREAD for reads starting just past the end of an object.  */
      overread = pad->src.sizrng[1] - pad->src.offrng[0] < pad->src.bndrng[0];
      range[0] = wide_int_to_tree (sizetype, pad->src.bndrng[0]);
      slen = size_zero_node;
    }

  if (overread)
    {
      if (TREE_NO_WARNING (exp)
	  || (srcstr && TREE_NO_WARNING (srcstr))
	  || (pad && pad->src.ref && TREE_NO_WARNING (pad->src.ref)))
	return false;

      location_t loc = tree_inlined_location (exp);
      const bool read
	= mode == access_read_only || mode == access_read_write;
      const bool maybe = pad && pad->dst.parmarray;
      if (warn_for_access (loc, func, exp, OPT_Wstringop_overread, range,
			   slen, false, read, maybe))
	{
	  TREE_NO_WARNING (exp) = true;
	  if (pad)
	    pad->src.inform_access (access_read_only);
	}
      return false;
    }

  return true;
}

/* A convenience wrapper for check_access above to check access
   by a read-only function like puts.  */

static bool
check_read_access (tree exp, tree src, tree bound /* = NULL_TREE */,
		   int ost /* = 1 */)
{
  if (!warn_stringop_overread)
    return true;

  access_data data (exp, access_read_only, NULL_TREE, false, bound, true);
  compute_objsize (src, ost, &data.src);
  return check_access (exp, /*dstwrite=*/ NULL_TREE, /*maxread=*/ bound,
		       /*srcstr=*/ src, /*dstsize=*/ NULL_TREE, data.mode,
		       &data);
}

/* If STMT is a call to an allocation function, returns the constant
   maximum size of the object allocated by the call represented as
   sizetype.  If nonnull, sets RNG1[] to the range of the size.
   When nonnull, uses RVALS for range information, otherwise calls
   get_range_info to get it.
   Returns null when STMT is not a call to a valid allocation function.  */

tree
gimple_call_alloc_size (gimple *stmt, wide_int rng1[2] /* = NULL */,
			range_query * /* = NULL */)
{
  if (!stmt || !is_gimple_call (stmt))
    return NULL_TREE;

  tree allocfntype;
  if (tree fndecl = gimple_call_fndecl (stmt))
    allocfntype = TREE_TYPE (fndecl);
  else
    allocfntype = gimple_call_fntype (stmt);

  if (!allocfntype)
    return NULL_TREE;

  unsigned argidx1 = UINT_MAX, argidx2 = UINT_MAX;
  tree at = lookup_attribute ("alloc_size", TYPE_ATTRIBUTES (allocfntype));
  if (!at)
    {
      if (!gimple_call_builtin_p (stmt, BUILT_IN_ALLOCA_WITH_ALIGN))
	return NULL_TREE;

      argidx1 = 0;
    }

  unsigned nargs = gimple_call_num_args (stmt);

  if (argidx1 == UINT_MAX)
    {
      tree atval = TREE_VALUE (at);
      if (!atval)
	return NULL_TREE;

      argidx1 = TREE_INT_CST_LOW (TREE_VALUE (atval)) - 1;
      if (nargs <= argidx1)
	return NULL_TREE;

      atval = TREE_CHAIN (atval);
      if (atval)
	{
	  argidx2 = TREE_INT_CST_LOW (TREE_VALUE (atval)) - 1;
	  if (nargs <= argidx2)
	    return NULL_TREE;
	}
    }

  tree size = gimple_call_arg (stmt, argidx1);

  wide_int rng1_buf[2];
  /* If RNG1 is not set, use the buffer.  */
  if (!rng1)
    rng1 = rng1_buf;

  /* Use maximum precision to avoid overflow below.  */
  const int prec = ADDR_MAX_PRECISION;

  {
    tree r[2];
    /* Determine the largest valid range size, including zero.  */
    if (!get_size_range (size, r, SR_ALLOW_ZERO | SR_USE_LARGEST))
      return NULL_TREE;
    rng1[0] = wi::to_wide (r[0], prec);
    rng1[1] = wi::to_wide (r[1], prec);
  }

  if (argidx2 > nargs && TREE_CODE (size) == INTEGER_CST)
    return fold_convert (sizetype, size);

  /* To handle ranges do the math in wide_int and return the product
     of the upper bounds as a constant.  Ignore anti-ranges.  */
  tree n = argidx2 < nargs ? gimple_call_arg (stmt, argidx2) : integer_one_node;
  wide_int rng2[2];
  {
    tree r[2];
      /* As above, use the full non-negative range on failure.  */
    if (!get_size_range (n, r, SR_ALLOW_ZERO | SR_USE_LARGEST))
      return NULL_TREE;
    rng2[0] = wi::to_wide (r[0], prec);
    rng2[1] = wi::to_wide (r[1], prec);
  }

  /* Compute products of both bounds for the caller but return the lesser
     of SIZE_MAX and the product of the upper bounds as a constant.  */
  rng1[0] = rng1[0] * rng2[0];
  rng1[1] = rng1[1] * rng2[1];

  const tree size_max = TYPE_MAX_VALUE (sizetype);
  if (wi::gtu_p (rng1[1], wi::to_wide (size_max, prec)))
    {
      rng1[1] = wi::to_wide (size_max, prec);
      return size_max;
    }

  return wide_int_to_tree (sizetype, rng1[1]);
}

/* For an access to an object referenced to by the function parameter PTR
   of pointer type, and set RNG[] to the range of sizes of the object
   obtainedfrom the attribute access specification for the current function.
   Set STATIC_ARRAY if the array parameter has been declared [static].
   Return the function parameter on success and null otherwise.  */

tree
gimple_parm_array_size (tree ptr, wide_int rng[2],
			bool *static_array /* = NULL */)
{
  /* For a function argument try to determine the byte size of the array
     from the current function declaratation (e.g., attribute access or
     related).  */
  tree var = SSA_NAME_VAR (ptr);
  if (TREE_CODE (var) != PARM_DECL)
    return NULL_TREE;

  const unsigned prec = TYPE_PRECISION (sizetype);

  rdwr_map rdwr_idx;
  attr_access *access = get_parm_access (rdwr_idx, var);
  if (!access)
    return NULL_TREE;

  if (access->sizarg != UINT_MAX)
    {
      /* TODO: Try to extract the range from the argument based on
	 those of subsequent assertions or based on known calls to
	 the current function.  */
      return NULL_TREE;
    }

  if (!access->minsize)
    return NULL_TREE;

  /* Only consider ordinary array bound at level 2 (or above if it's
     ever added).  */
  if (warn_array_parameter < 2 && !access->static_p)
    return NULL_TREE;

  if (static_array)
    *static_array = access->static_p;

  rng[0] = wi::zero (prec);
  rng[1] = wi::uhwi (access->minsize, prec);
  /* Multiply the array bound encoded in the attribute by the size
     of what the pointer argument to which it decays points to.  */
  tree eltype = TREE_TYPE (TREE_TYPE (ptr));
  tree size = TYPE_SIZE_UNIT (eltype);
  if (!size || TREE_CODE (size) != INTEGER_CST)
    return NULL_TREE;

  rng[1] *= wi::to_wide (size, prec);
  return var;
}

/* Wrapper around the wide_int overload of get_range that accepts
   offset_int instead.  For middle end expressions returns the same
   result.  For a subset of nonconstamt expressions emitted by the front
   end determines a more precise range than would be possible otherwise.  */

static bool
get_offset_range (tree x, gimple *stmt, offset_int r[2], range_query *rvals)
{
  offset_int add = 0;
  if (TREE_CODE (x) == PLUS_EXPR)
    {
      /* Handle constant offsets in pointer addition expressions seen
	 n the front end IL.  */
      tree op = TREE_OPERAND (x, 1);
      if (TREE_CODE (op) == INTEGER_CST)
	{
	  op = fold_convert (signed_type_for (TREE_TYPE (op)), op);
	  add = wi::to_offset (op);
	  x = TREE_OPERAND (x, 0);
	}
    }

  if (TREE_CODE (x) == NOP_EXPR)
    /* Also handle conversions to sizetype seen in the front end IL.  */
    x = TREE_OPERAND (x, 0);

  tree type = TREE_TYPE (x);
  if (!INTEGRAL_TYPE_P (type) && !POINTER_TYPE_P (type))
    return false;

   if (TREE_CODE (x) != INTEGER_CST
      && TREE_CODE (x) != SSA_NAME)
    {
      if (TYPE_UNSIGNED (type)
	  && TYPE_PRECISION (type) == TYPE_PRECISION (sizetype))
	type = signed_type_for (type);

      r[0] = wi::to_offset (TYPE_MIN_VALUE (type)) + add;
      r[1] = wi::to_offset (TYPE_MAX_VALUE (type)) + add;
      return x;
    }

  wide_int wr[2];
  if (!get_range (x, stmt, wr, rvals))
    return false;

  signop sgn = SIGNED;
  /* Only convert signed integers or unsigned sizetype to a signed
     offset and avoid converting large positive values in narrower
     types to negative offsets.  */
  if (TYPE_UNSIGNED (type)
      && wr[0].get_precision () < TYPE_PRECISION (sizetype))
    sgn = UNSIGNED;

  r[0] = offset_int::from (wr[0], sgn);
  r[1] = offset_int::from (wr[1], sgn);
  return true;
}

/* Return the argument that the call STMT to a built-in function returns
   or null if it doesn't.  On success, set OFFRNG[] to the range of offsets
   from the argument reflected in the value returned by the built-in if it
   can be determined, otherwise to 0 and HWI_M1U respectively.  */

static tree
gimple_call_return_array (gimple *stmt, offset_int offrng[2],
			  range_query *rvals)
{
  if (!gimple_call_builtin_p (stmt, BUILT_IN_NORMAL)
      || gimple_call_num_args (stmt) < 1)
    return NULL_TREE;

  tree fn = gimple_call_fndecl (stmt);
  switch (DECL_FUNCTION_CODE (fn))
    {
    case BUILT_IN_MEMCPY:
    case BUILT_IN_MEMCPY_CHK:
    case BUILT_IN_MEMMOVE:
    case BUILT_IN_MEMMOVE_CHK:
    case BUILT_IN_MEMSET:
    case BUILT_IN_STPCPY:
    case BUILT_IN_STPCPY_CHK:
    case BUILT_IN_STPNCPY:
    case BUILT_IN_STPNCPY_CHK:
    case BUILT_IN_STRCAT:
    case BUILT_IN_STRCAT_CHK:
    case BUILT_IN_STRCPY:
    case BUILT_IN_STRCPY_CHK:
    case BUILT_IN_STRNCAT:
    case BUILT_IN_STRNCAT_CHK:
    case BUILT_IN_STRNCPY:
    case BUILT_IN_STRNCPY_CHK:
      offrng[0] = offrng[1] = 0;
      return gimple_call_arg (stmt, 0);

    case BUILT_IN_MEMPCPY:
    case BUILT_IN_MEMPCPY_CHK:
      {
	tree off = gimple_call_arg (stmt, 2);
	if (!get_offset_range (off, stmt, offrng, rvals))
	  {
	    offrng[0] = 0;
	    offrng[1] = HOST_WIDE_INT_M1U;
	  }
	return gimple_call_arg (stmt, 0);
      }

    case BUILT_IN_MEMCHR:
      {
	tree off = gimple_call_arg (stmt, 2);
	if (get_offset_range (off, stmt, offrng, rvals))
	  offrng[0] = 0;
	else
	  {
	    offrng[0] = 0;
	    offrng[1] = HOST_WIDE_INT_M1U;
	  }
	return gimple_call_arg (stmt, 0);
      }

    case BUILT_IN_STRCHR:
    case BUILT_IN_STRRCHR:
    case BUILT_IN_STRSTR:
      {
	offrng[0] = 0;
	offrng[1] = HOST_WIDE_INT_M1U;
      }
      return gimple_call_arg (stmt, 0);

    default:
      break;
    }

  return NULL_TREE;
}

/* A helper of compute_objsize_r() to determine the size from an assignment
   statement STMT with the RHS of either MIN_EXPR or MAX_EXPR.  */

static bool
handle_min_max_size (gimple *stmt, int ostype, access_ref *pref,
		     ssa_name_limit_t &snlim, pointer_query *qry)
{
  tree_code code = gimple_assign_rhs_code (stmt);

  tree ptr = gimple_assign_rhs1 (stmt);

  /* In a valid MAX_/MIN_EXPR both operands must refer to the same array.
     Determine the size/offset of each and use the one with more or less
     space remaining, respectively.  If either fails, use the information
     determined from the other instead, adjusted up or down as appropriate
     for the expression.  */
  access_ref aref[2] = { *pref, *pref };
  if (!compute_objsize_r (ptr, ostype, &aref[0], snlim, qry))
    {
      aref[0].base0 = false;
      aref[0].offrng[0] = aref[0].offrng[1] = 0;
      aref[0].add_max_offset ();
      aref[0].set_max_size_range ();
    }

  ptr = gimple_assign_rhs2 (stmt);
  if (!compute_objsize_r (ptr, ostype, &aref[1], snlim, qry))
    {
      aref[1].base0 = false;
      aref[1].offrng[0] = aref[1].offrng[1] = 0;
      aref[1].add_max_offset ();
      aref[1].set_max_size_range ();
    }

  if (!aref[0].ref && !aref[1].ref)
    /* Fail if the identity of neither argument could be determined.  */
    return false;

  bool i0 = false;
  if (aref[0].ref && aref[0].base0)
    {
      if (aref[1].ref && aref[1].base0)
	{
	  /* If the object referenced by both arguments has been determined
	     set *PREF to the one with more or less space remainng, whichever
	     is appopriate for CODE.
	     TODO: Indicate when the objects are distinct so it can be
	     diagnosed.  */
	  i0 = code == MAX_EXPR;
	  const bool i1 = !i0;

	  if (aref[i0].size_remaining () < aref[i1].size_remaining ())
	    *pref = aref[i1];
	  else
	    *pref = aref[i0];
	  return true;
	}

      /* If only the object referenced by one of the arguments could be
	 determined, use it and...  */
      *pref = aref[0];
      i0 = true;
    }
  else
    *pref = aref[1];

  const bool i1 = !i0;
  /* ...see if the offset obtained from the other pointer can be used
     to tighten up the bound on the offset obtained from the first.  */
  if ((code == MAX_EXPR && aref[i1].offrng[1] < aref[i0].offrng[0])
      || (code == MIN_EXPR && aref[i0].offrng[0] < aref[i1].offrng[1]))
    {
      pref->offrng[0] = aref[i0].offrng[0];
      pref->offrng[1] = aref[i0].offrng[1];
    }
  return true;
}

/* A helper of compute_objsize_r() to determine the size from ARRAY_REF
   AREF.  ADDR is true if PTR is the operand of ADDR_EXPR.  Return true
   on success and false on failure.  */

static bool
handle_array_ref (tree aref, bool addr, int ostype, access_ref *pref,
		  ssa_name_limit_t &snlim, pointer_query *qry)
{
  gcc_assert (TREE_CODE (aref) == ARRAY_REF);

  ++pref->deref;

  tree arefop = TREE_OPERAND (aref, 0);
  tree reftype = TREE_TYPE (arefop);
  if (!addr && TREE_CODE (TREE_TYPE (reftype)) == POINTER_TYPE)
    /* Avoid arrays of pointers.  FIXME: Hande pointers to arrays
       of known bound.  */
    return false;

  if (!compute_objsize_r (arefop, ostype, pref, snlim, qry))
    return false;

  offset_int orng[2];
  tree off = pref->eval (TREE_OPERAND (aref, 1));
  range_query *const rvals = qry ? qry->rvals : NULL;
  if (!get_offset_range (off, NULL, orng, rvals))
    {
      /* Set ORNG to the maximum offset representable in ptrdiff_t.  */
      orng[1] = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
      orng[0] = -orng[1] - 1;
    }

  /* Convert the array index range determined above to a byte
     offset.  */
  tree lowbnd = array_ref_low_bound (aref);
  if (!integer_zerop (lowbnd) && tree_fits_uhwi_p (lowbnd))
    {
      /* Adjust the index by the low bound of the array domain
	 (normally zero but 1 in Fortran).  */
      unsigned HOST_WIDE_INT lb = tree_to_uhwi (lowbnd);
      orng[0] -= lb;
      orng[1] -= lb;
    }

  tree eltype = TREE_TYPE (aref);
  tree tpsize = TYPE_SIZE_UNIT (eltype);
  if (!tpsize || TREE_CODE (tpsize) != INTEGER_CST)
    {
      pref->add_max_offset ();
      return true;
    }

  offset_int sz = wi::to_offset (tpsize);
  orng[0] *= sz;
  orng[1] *= sz;

  if (ostype && TREE_CODE (eltype) == ARRAY_TYPE)
    {
      /* Except for the permissive raw memory functions which use
	 the size of the whole object determined above, use the size
	 of the referenced array.  Because the overall offset is from
	 the beginning of the complete array object add this overall
	 offset to the size of array.  */
      offset_int sizrng[2] =
	{
	 pref->offrng[0] + orng[0] + sz,
	 pref->offrng[1] + orng[1] + sz
	};
      if (sizrng[1] < sizrng[0])
	std::swap (sizrng[0], sizrng[1]);
      if (sizrng[0] >= 0 && sizrng[0] <= pref->sizrng[0])
	pref->sizrng[0] = sizrng[0];
      if (sizrng[1] >= 0 && sizrng[1] <= pref->sizrng[1])
	pref->sizrng[1] = sizrng[1];
    }

  pref->add_offset (orng[0], orng[1]);
  return true;
}

/* A helper of compute_objsize_r() to determine the size from MEM_REF
   MREF.  Return true on success and false on failure.  */

static bool
handle_mem_ref (tree mref, int ostype, access_ref *pref,
		ssa_name_limit_t &snlim, pointer_query *qry)
{
  gcc_assert (TREE_CODE (mref) == MEM_REF);

  ++pref->deref;

  if (VECTOR_TYPE_P (TREE_TYPE (mref)))
    {
      /* Hack: Give up for MEM_REFs of vector types; those may be
	 synthesized from multiple assignments to consecutive data
	 members (see PR 93200 and 96963).
	 FIXME: Vectorized assignments should only be present after
	 vectorization so this hack is only necessary after it has
	 run and could be avoided in calls from prior passes (e.g.,
	 tree-ssa-strlen.c).
	 FIXME: Deal with this more generally, e.g., by marking up
	 such MEM_REFs at the time they're created.  */
      return false;
    }

  tree mrefop = TREE_OPERAND (mref, 0);
  if (!compute_objsize_r (mrefop, ostype, pref, snlim, qry))
    return false;

  offset_int orng[2];
  tree off = pref->eval (TREE_OPERAND (mref, 1));
  range_query *const rvals = qry ? qry->rvals : NULL;
  if (!get_offset_range (off, NULL, orng, rvals))
    {
      /* Set ORNG to the maximum offset representable in ptrdiff_t.  */
      orng[1] = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
      orng[0] = -orng[1] - 1;
    }

  pref->add_offset (orng[0], orng[1]);
  return true;
}

/* Helper to compute the size of the object referenced by the PTR
   expression which must have pointer type, using Object Size type
   OSTYPE (only the least significant 2 bits are used).
   On success, sets PREF->REF to the DECL of the referenced object
   if it's unique, otherwise to null, PREF->OFFRNG to the range of
   offsets into it, and PREF->SIZRNG to the range of sizes of
   the object(s).
   SNLIM is used to avoid visiting the same PHI operand multiple
   times, and, when nonnull, RVALS to determine range information.
   Returns true on success, false when a meaningful size (or range)
   cannot be determined.

   The function is intended for diagnostics and should not be used
   to influence code generation or optimization.  */

static bool
compute_objsize_r (tree ptr, int ostype, access_ref *pref,
		   ssa_name_limit_t &snlim, pointer_query *qry)
{
  STRIP_NOPS (ptr);

  const bool addr = TREE_CODE (ptr) == ADDR_EXPR;
  if (addr)
    {
      --pref->deref;
      ptr = TREE_OPERAND (ptr, 0);
    }

  if (DECL_P (ptr))
    {
      pref->ref = ptr;

      if (!addr && POINTER_TYPE_P (TREE_TYPE (ptr)))
	{
	  /* Set the maximum size if the reference is to the pointer
	     itself (as opposed to what it points to), and clear
	     BASE0 since the offset isn't necessarily zero-based.  */
	  pref->set_max_size_range ();
	  pref->base0 = false;
	  return true;
	}

      if (tree size = decl_init_size (ptr, false))
	if (TREE_CODE (size) == INTEGER_CST)
	  {
	    pref->sizrng[0] = pref->sizrng[1] = wi::to_offset (size);
	    return true;
	  }

      pref->set_max_size_range ();
      return true;
    }

  const tree_code code = TREE_CODE (ptr);
  range_query *const rvals = qry ? qry->rvals : NULL;

  if (code == BIT_FIELD_REF)
    {
      tree ref = TREE_OPERAND (ptr, 0);
      if (!compute_objsize_r (ref, ostype, pref, snlim, qry))
	return false;

      offset_int off = wi::to_offset (pref->eval (TREE_OPERAND (ptr, 2)));
      pref->add_offset (off / BITS_PER_UNIT);
      return true;
    }

  if (code == COMPONENT_REF)
    {
      tree ref = TREE_OPERAND (ptr, 0);
      if (TREE_CODE (TREE_TYPE (ref)) == UNION_TYPE)
	/* In accesses through union types consider the entire unions
	   rather than just their members.  */
	ostype = 0;
      tree field = TREE_OPERAND (ptr, 1);

      if (ostype == 0)
	{
	  /* In OSTYPE zero (for raw memory functions like memcpy), use
	     the maximum size instead if the identity of the enclosing
	     object cannot be determined.  */
	  if (!compute_objsize_r (ref, ostype, pref, snlim, qry))
	    return false;

	  /* Otherwise, use the size of the enclosing object and add
	     the offset of the member to the offset computed so far.  */
	  tree offset = byte_position (field);
	  if (TREE_CODE (offset) == INTEGER_CST)
	    pref->add_offset (wi::to_offset (offset));
	  else
	    pref->add_max_offset ();

	  if (!pref->ref)
	    /* REF may have been already set to an SSA_NAME earlier
	       to provide better context for diagnostics.  In that case,
	       leave it unchanged.  */
	    pref->ref = ref;
	  return true;
	}

      pref->ref = field;

      if (!addr && POINTER_TYPE_P (TREE_TYPE (field)))
	{
	  /* Set maximum size if the reference is to the pointer member
	     itself (as opposed to what it points to).  */
	  pref->set_max_size_range ();
	  return true;
	}

      /* SAM is set for array members that might need special treatment.  */
      special_array_member sam;
      tree size = component_ref_size (ptr, &sam);
      if (sam == special_array_member::int_0)
	pref->sizrng[0] = pref->sizrng[1] = 0;
      else if (!pref->trail1special && sam == special_array_member::trail_1)
	pref->sizrng[0] = pref->sizrng[1] = 1;
      else if (size && TREE_CODE (size) == INTEGER_CST)
	pref->sizrng[0] = pref->sizrng[1] = wi::to_offset (size);
      else
	{
	  /* When the size of the member is unknown it's either a flexible
	     array member or a trailing special array member (either zero
	     length or one-element).  Set the size to the maximum minus
	     the constant size of the type.  */
	  pref->sizrng[0] = 0;
	  pref->sizrng[1] = wi::to_offset (TYPE_MAX_VALUE (ptrdiff_type_node));
	  if (tree recsize = TYPE_SIZE_UNIT (TREE_TYPE (ref)))
	    if (TREE_CODE (recsize) == INTEGER_CST)
	      pref->sizrng[1] -= wi::to_offset (recsize);
	}
      return true;
    }

  if (code == ARRAY_REF)
    return handle_array_ref (ptr, addr, ostype, pref, snlim, qry);

  if (code == MEM_REF)
    return handle_mem_ref (ptr, ostype, pref, snlim, qry);

  if (code == TARGET_MEM_REF)
    {
      tree ref = TREE_OPERAND (ptr, 0);
      if (!compute_objsize_r (ref, ostype, pref, snlim, qry))
	return false;

      /* TODO: Handle remaining operands.  Until then, add maximum offset.  */
      pref->ref = ptr;
      pref->add_max_offset ();
      return true;
    }

  if (code == INTEGER_CST)
    {
      /* Pointer constants other than null are most likely the result
	 of erroneous null pointer addition/subtraction.  Set size to
	 zero.  For null pointers, set size to the maximum for now
	 since those may be the result of jump threading.  */
      if (integer_zerop (ptr))
	pref->set_max_size_range ();
      else
	pref->sizrng[0] = pref->sizrng[1] = 0;
      pref->ref = ptr;

      return true;
    }

  if (code == STRING_CST)
    {
      pref->sizrng[0] = pref->sizrng[1] = TREE_STRING_LENGTH (ptr);
      pref->ref = ptr;
      return true;
    }

  if (code == POINTER_PLUS_EXPR)
    {
      tree ref = TREE_OPERAND (ptr, 0);
      if (!compute_objsize_r (ref, ostype, pref, snlim, qry))
	return false;

      /* Clear DEREF since the offset is being applied to the target
	 of the dereference.  */
      pref->deref = 0;

      offset_int orng[2];
      tree off = pref->eval (TREE_OPERAND (ptr, 1));
      if (get_offset_range (off, NULL, orng, rvals))
	pref->add_offset (orng[0], orng[1]);
      else
	pref->add_max_offset ();
      return true;
    }

  if (code == VIEW_CONVERT_EXPR)
    {
      ptr = TREE_OPERAND (ptr, 0);
      return compute_objsize_r (ptr, ostype, pref, snlim, qry);
    }

  if (code == SSA_NAME)
    {
      if (!snlim.next ())
	return false;

      /* Only process an SSA_NAME if the recursion limit has not yet
	 been reached.  */
      if (qry)
	{
	  if (++qry->depth)
	    qry->max_depth = qry->depth;
	  if (const access_ref *cache_ref = qry->get_ref (ptr))
	    {
	      /* If the pointer is in the cache set *PREF to what it refers
		 to and return success.  */
	      *pref = *cache_ref;
	      return true;
	    }
	}

      gimple *stmt = SSA_NAME_DEF_STMT (ptr);
      if (is_gimple_call (stmt))
	{
	  /* If STMT is a call to an allocation function get the size
	     from its argument(s).  If successful, also set *PREF->REF
	     to PTR for the caller to include in diagnostics.  */
	  wide_int wr[2];
	  if (gimple_call_alloc_size (stmt, wr, rvals))
	    {
	      pref->ref = ptr;
	      pref->sizrng[0] = offset_int::from (wr[0], UNSIGNED);
	      pref->sizrng[1] = offset_int::from (wr[1], UNSIGNED);
	      /* Constrain both bounds to a valid size.  */
	      offset_int maxsize = wi::to_offset (max_object_size ());
	      if (pref->sizrng[0] > maxsize)
		pref->sizrng[0] = maxsize;
	      if (pref->sizrng[1] > maxsize)
		pref->sizrng[1] = maxsize;
	    }
	  else
	    {
	      /* For functions known to return one of their pointer arguments
		 try to determine what the returned pointer points to, and on
		 success add OFFRNG which was set to the offset added by
		 the function (e.g., memchr) to the overall offset.  */
	      offset_int offrng[2];
	      if (tree ret = gimple_call_return_array (stmt, offrng, rvals))
		{
		  if (!compute_objsize_r (ret, ostype, pref, snlim, qry))
		    return false;

		  /* Cap OFFRNG[1] to at most the remaining size of
		     the object.  */
		  offset_int remrng[2];
		  remrng[1] = pref->size_remaining (remrng);
		  if (remrng[1] < offrng[1])
		    offrng[1] = remrng[1];
		  pref->add_offset (offrng[0], offrng[1]);
		}
	      else
		{
		  /* For other calls that might return arbitrary pointers
		     including into the middle of objects set the size
		     range to maximum, clear PREF->BASE0, and also set
		     PREF->REF to include in diagnostics.  */
		  pref->set_max_size_range ();
		  pref->base0 = false;
		  pref->ref = ptr;
		}
	    }
	  qry->put_ref (ptr, *pref);
	  return true;
	}

      if (gimple_nop_p (stmt))
	{
	  /* For a function argument try to determine the byte size
	     of the array from the current function declaratation
	     (e.g., attribute access or related).  */
	  wide_int wr[2];
	  bool static_array = false;
	  if (tree ref = gimple_parm_array_size (ptr, wr, &static_array))
	    {
	      pref->parmarray = !static_array;
	      pref->sizrng[0] = offset_int::from (wr[0], UNSIGNED);
	      pref->sizrng[1] = offset_int::from (wr[1], UNSIGNED);
	      pref->ref = ref;
	      qry->put_ref (ptr, *pref);
	      return true;
	    }

	  pref->set_max_size_range ();
	  pref->base0 = false;
	  pref->ref = ptr;
	  qry->put_ref (ptr, *pref);
	  return true;
	}

      if (gimple_code (stmt) == GIMPLE_PHI)
	{
	  pref->ref = ptr;
	  access_ref phi_ref = *pref;
	  if (!pref->get_ref (NULL, &phi_ref, ostype, &snlim, qry))
	    return false;
	  *pref = phi_ref;
	  pref->ref = ptr;
	  qry->put_ref (ptr, *pref);
	  return true;
	}

      if (!is_gimple_assign (stmt))
	{
	  /* Clear BASE0 since the assigned pointer might point into
	     the middle of the object, set the maximum size range and,
	     if the SSA_NAME refers to a function argumnent, set
	     PREF->REF to it.  */
	  pref->base0 = false;
	  pref->set_max_size_range ();
	  pref->ref = ptr;
	  return true;
	}

      tree_code code = gimple_assign_rhs_code (stmt);

      if (code == MAX_EXPR || code == MIN_EXPR)
	{
	  if (!handle_min_max_size (stmt, ostype, pref, snlim, qry))
	    return false;
	  qry->put_ref (ptr, *pref);
	  return true;
	}

      tree rhs = gimple_assign_rhs1 (stmt);

      if (code == POINTER_PLUS_EXPR
	  && TREE_CODE (TREE_TYPE (rhs)) == POINTER_TYPE)
	{
	  /* Compute the size of the object first. */
	  if (!compute_objsize_r (rhs, ostype, pref, snlim, qry))
	    return false;

	  offset_int orng[2];
	  tree off = gimple_assign_rhs2 (stmt);
	  if (get_offset_range (off, stmt, orng, rvals))
	    pref->add_offset (orng[0], orng[1]);
	  else
	    pref->add_max_offset ();
	  qry->put_ref (ptr, *pref);
	  return true;
	}

      if (code == ADDR_EXPR
	  || code == SSA_NAME)
	return compute_objsize_r (rhs, ostype, pref, snlim, qry);

      /* (This could also be an assignment from a nonlocal pointer.)  Save
	 PTR to mention in diagnostics but otherwise treat it as a pointer
	 to an unknown object.  */
      pref->ref = rhs;
      pref->base0 = false;
      pref->set_max_size_range ();
      return true;
    }

  /* Assume all other expressions point into an unknown object
     of the maximum valid size.  */
  pref->ref = ptr;
  pref->base0 = false;
  pref->set_max_size_range ();
  if (TREE_CODE (ptr) == SSA_NAME)
    qry->put_ref (ptr, *pref);
  return true;
}

/* A "public" wrapper around the above.  Clients should use this overload
   instead.  */

tree
compute_objsize (tree ptr, int ostype, access_ref *pref,
		 range_query *rvals /* = NULL */)
{
  pointer_query qry;
  qry.rvals = rvals;
  ssa_name_limit_t snlim;
  if (!compute_objsize_r (ptr, ostype, pref, snlim, &qry))
    return NULL_TREE;

  offset_int maxsize = pref->size_remaining ();
  if (pref->base0 && pref->offrng[0] < 0 && pref->offrng[1] >= 0)
    pref->offrng[0] = 0;
  return wide_int_to_tree (sizetype, maxsize);
}

/* Transitional wrapper.  The function should be removed once callers
   transition to the pointer_query API.  */

tree
compute_objsize (tree ptr, int ostype, access_ref *pref, pointer_query *ptr_qry)
{
  pointer_query qry;
  if (ptr_qry)
    ptr_qry->depth = 0;
  else
    ptr_qry = &qry;

  ssa_name_limit_t snlim;
  if (!compute_objsize_r (ptr, ostype, pref, snlim, ptr_qry))
    return NULL_TREE;

  offset_int maxsize = pref->size_remaining ();
  if (pref->base0 && pref->offrng[0] < 0 && pref->offrng[1] >= 0)
    pref->offrng[0] = 0;
  return wide_int_to_tree (sizetype, maxsize);
}

/* Legacy wrapper around the above.  The function should be removed
   once callers transition to one of the two above.  */

tree
compute_objsize (tree ptr, int ostype, tree *pdecl /* = NULL */,
		 tree *poff /* = NULL */, range_query *rvals /* = NULL */)
{
  /* Set the initial offsets to zero and size to negative to indicate
     none has been computed yet.  */
  access_ref ref;
  tree size = compute_objsize (ptr, ostype, &ref, rvals);
  if (!size || !ref.base0)
    return NULL_TREE;

  if (pdecl)
    *pdecl = ref.ref;

  if (poff)
    *poff = wide_int_to_tree (ptrdiff_type_node, ref.offrng[ref.offrng[0] < 0]);

  return size;
}

/* Helper to determine and check the sizes of the source and the destination
   of calls to __builtin_{bzero,memcpy,mempcpy,memset} calls.  EXP is the
   call expression, DEST is the destination argument, SRC is the source
   argument or null, and LEN is the number of bytes.  Use Object Size type-0
   regardless of the OPT_Wstringop_overflow_ setting.  Return true on success
   (no overflow or invalid sizes), false otherwise.  */

static bool
check_memop_access (tree exp, tree dest, tree src, tree size)
{
  /* For functions like memset and memcpy that operate on raw memory
     try to determine the size of the largest source and destination
     object using type-0 Object Size regardless of the object size
     type specified by the option.  */
  access_data data (exp, access_read_write);
  tree srcsize = src ? compute_objsize (src, 0, &data.src) : NULL_TREE;
  tree dstsize = compute_objsize (dest, 0, &data.dst);

  return check_access (exp, size, /*maxread=*/NULL_TREE,
		       srcsize, dstsize, data.mode, &data);
}

/* Validate memchr arguments without performing any expansion.
   Return NULL_RTX.  */

static rtx
expand_builtin_memchr (tree exp, rtx)
{
  if (!validate_arglist (exp,
 			 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree arg1 = CALL_EXPR_ARG (exp, 0);
  tree len = CALL_EXPR_ARG (exp, 2);

  check_read_access (exp, arg1, len, 0);

  return NULL_RTX;
}

/* Expand a call EXP to the memcpy builtin.
   Return NULL_RTX if we failed, the caller should emit a normal call,
   otherwise try to get the result in TARGET, if convenient (and in
   mode MODE if that's convenient).  */

static rtx
expand_builtin_memcpy (tree exp, rtx target)
{
  if (!validate_arglist (exp,
 			 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree dest = CALL_EXPR_ARG (exp, 0);
  tree src = CALL_EXPR_ARG (exp, 1);
  tree len = CALL_EXPR_ARG (exp, 2);

  check_memop_access (exp, dest, src, len);

  return expand_builtin_memory_copy_args (dest, src, len, target, exp,
					  /*retmode=*/ RETURN_BEGIN, false);
}

/* Check a call EXP to the memmove built-in for validity.
   Return NULL_RTX on both success and failure.  */

static rtx
expand_builtin_memmove (tree exp, rtx target)
{
  if (!validate_arglist (exp,
 			 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree dest = CALL_EXPR_ARG (exp, 0);
  tree src = CALL_EXPR_ARG (exp, 1);
  tree len = CALL_EXPR_ARG (exp, 2);

  check_memop_access (exp, dest, src, len);

  return expand_builtin_memory_copy_args (dest, src, len, target, exp,
					  /*retmode=*/ RETURN_BEGIN, true);
}

/* Expand a call EXP to the mempcpy builtin.
   Return NULL_RTX if we failed; the caller should emit a normal call,
   otherwise try to get the result in TARGET, if convenient (and in
   mode MODE if that's convenient).  */

static rtx
expand_builtin_mempcpy (tree exp, rtx target)
{
  if (!validate_arglist (exp,
 			 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree dest = CALL_EXPR_ARG (exp, 0);
  tree src = CALL_EXPR_ARG (exp, 1);
  tree len = CALL_EXPR_ARG (exp, 2);

  /* Policy does not generally allow using compute_objsize (which
     is used internally by check_memop_size) to change code generation
     or drive optimization decisions.

     In this instance it is safe because the code we generate has
     the same semantics regardless of the return value of
     check_memop_sizes.   Exactly the same amount of data is copied
     and the return value is exactly the same in both cases.

     Furthermore, check_memop_size always uses mode 0 for the call to
     compute_objsize, so the imprecise nature of compute_objsize is
     avoided.  */

  /* Avoid expanding mempcpy into memcpy when the call is determined
     to overflow the buffer.  This also prevents the same overflow
     from being diagnosed again when expanding memcpy.  */
  if (!check_memop_access (exp, dest, src, len))
    return NULL_RTX;

  return expand_builtin_mempcpy_args (dest, src, len,
				      target, exp, /*retmode=*/ RETURN_END);
}

/* Helper function to do the actual work for expand of memory copy family
   functions (memcpy, mempcpy, stpcpy).  Expansing should assign LEN bytes
   of memory from SRC to DEST and assign to TARGET if convenient.  Return
   value is based on RETMODE argument.  */

static rtx
expand_builtin_memory_copy_args (tree dest, tree src, tree len,
				 rtx target, tree exp, memop_ret retmode,
				 bool might_overlap)
{
  unsigned int src_align = get_pointer_alignment (src);
  unsigned int dest_align = get_pointer_alignment (dest);
  rtx dest_mem, src_mem, dest_addr, len_rtx;
  HOST_WIDE_INT expected_size = -1;
  unsigned int expected_align = 0;
  unsigned HOST_WIDE_INT min_size;
  unsigned HOST_WIDE_INT max_size;
  unsigned HOST_WIDE_INT probable_max_size;

  bool is_move_done;

  /* If DEST is not a pointer type, call the normal function.  */
  if (dest_align == 0)
    return NULL_RTX;

  /* If either SRC is not a pointer type, don't do this
     operation in-line.  */
  if (src_align == 0)
    return NULL_RTX;

  if (currently_expanding_gimple_stmt)
    stringop_block_profile (currently_expanding_gimple_stmt,
			    &expected_align, &expected_size);

  if (expected_align < dest_align)
    expected_align = dest_align;
  dest_mem = get_memory_rtx (dest, len);
  set_mem_align (dest_mem, dest_align);
  len_rtx = expand_normal (len);
  determine_block_size (len, len_rtx, &min_size, &max_size,
			&probable_max_size);

  /* Try to get the byte representation of the constant SRC points to,
     with its byte size in NBYTES.  */
  unsigned HOST_WIDE_INT nbytes;
  const char *rep = getbyterep (src, &nbytes);

  /* If the function's constant bound LEN_RTX is less than or equal
     to the byte size of the representation of the constant argument,
     and if block move would be done by pieces, we can avoid loading
     the bytes from memory and only store the computed constant.
     This works in the overlap (memmove) case as well because
     store_by_pieces just generates a series of stores of constants
     from the representation returned by getbyterep().  */
  if (rep
      && CONST_INT_P (len_rtx)
      && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= nbytes
      && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
			      CONST_CAST (char *, rep),
			      dest_align, false))
    {
      dest_mem = store_by_pieces (dest_mem, INTVAL (len_rtx),
				  builtin_memcpy_read_str,
				  CONST_CAST (char *, rep),
				  dest_align, false, retmode);
      dest_mem = force_operand (XEXP (dest_mem, 0), target);
      dest_mem = convert_memory_address (ptr_mode, dest_mem);
      return dest_mem;
    }

  src_mem = get_memory_rtx (src, len);
  set_mem_align (src_mem, src_align);

  /* Copy word part most expediently.  */
  enum block_op_methods method = BLOCK_OP_NORMAL;
  if (CALL_EXPR_TAILCALL (exp)
      && (retmode == RETURN_BEGIN || target == const0_rtx))
    method = BLOCK_OP_TAILCALL;
  bool use_mempcpy_call = (targetm.libc_has_fast_function (BUILT_IN_MEMPCPY)
			   && retmode == RETURN_END
			   && !might_overlap
			   && target != const0_rtx);
  if (use_mempcpy_call)
    method = BLOCK_OP_NO_LIBCALL_RET;
  dest_addr = emit_block_move_hints (dest_mem, src_mem, len_rtx, method,
				     expected_align, expected_size,
				     min_size, max_size, probable_max_size,
				     use_mempcpy_call, &is_move_done,
				     might_overlap);

  /* Bail out when a mempcpy call would be expanded as libcall and when
     we have a target that provides a fast implementation
     of mempcpy routine.  */
  if (!is_move_done)
    return NULL_RTX;

  if (dest_addr == pc_rtx)
    return NULL_RTX;

  if (dest_addr == 0)
    {
      dest_addr = force_operand (XEXP (dest_mem, 0), target);
      dest_addr = convert_memory_address (ptr_mode, dest_addr);
    }

  if (retmode != RETURN_BEGIN && target != const0_rtx)
    {
      dest_addr = gen_rtx_PLUS (ptr_mode, dest_addr, len_rtx);
      /* stpcpy pointer to last byte.  */
      if (retmode == RETURN_END_MINUS_ONE)
	dest_addr = gen_rtx_MINUS (ptr_mode, dest_addr, const1_rtx);
    }

  return dest_addr;
}

static rtx
expand_builtin_mempcpy_args (tree dest, tree src, tree len,
			     rtx target, tree orig_exp, memop_ret retmode)
{
  return expand_builtin_memory_copy_args (dest, src, len, target, orig_exp,
					  retmode, false);
}

/* Expand into a movstr instruction, if one is available.  Return NULL_RTX if
   we failed, the caller should emit a normal call, otherwise try to
   get the result in TARGET, if convenient.
   Return value is based on RETMODE argument.  */

static rtx
expand_movstr (tree dest, tree src, rtx target, memop_ret retmode)
{
  class expand_operand ops[3];
  rtx dest_mem;
  rtx src_mem;

  if (!targetm.have_movstr ())
    return NULL_RTX;

  dest_mem = get_memory_rtx (dest, NULL);
  src_mem = get_memory_rtx (src, NULL);
  if (retmode == RETURN_BEGIN)
    {
      target = force_reg (Pmode, XEXP (dest_mem, 0));
      dest_mem = replace_equiv_address (dest_mem, target);
    }

  create_output_operand (&ops[0],
			 retmode != RETURN_BEGIN ? target : NULL_RTX, Pmode);
  create_fixed_operand (&ops[1], dest_mem);
  create_fixed_operand (&ops[2], src_mem);
  if (!maybe_expand_insn (targetm.code_for_movstr, 3, ops))
    return NULL_RTX;

  if (retmode != RETURN_BEGIN && target != const0_rtx)
    {
      target = ops[0].value;
      /* movstr is supposed to set end to the address of the NUL
	 terminator.  If the caller requested a mempcpy-like return value,
	 adjust it.  */
      if (retmode == RETURN_END)
	{
	  rtx tem = plus_constant (GET_MODE (target),
				   gen_lowpart (GET_MODE (target), target), 1);
	  emit_move_insn (target, force_operand (tem, NULL_RTX));
	}
    }
  return target;
}

/* Do some very basic size validation of a call to the strcpy builtin
   given by EXP.  Return NULL_RTX to have the built-in expand to a call
   to the library function.  */

static rtx
expand_builtin_strcat (tree exp)
{
  if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
      || !warn_stringop_overflow)
    return NULL_RTX;

  tree dest = CALL_EXPR_ARG (exp, 0);
  tree src = CALL_EXPR_ARG (exp, 1);

  /* There is no way here to determine the length of the string in
     the destination to which the SRC string is being appended so
     just diagnose cases when the souce string is longer than
     the destination object.  */
  access_data data (exp, access_read_write, NULL_TREE, true,
		    NULL_TREE, true);
  const int ost = warn_stringop_overflow ? warn_stringop_overflow - 1 : 1;
  compute_objsize (src, ost, &data.src);
  tree destsize = compute_objsize (dest, ost, &data.dst);

  check_access (exp, /*dstwrite=*/NULL_TREE, /*maxread=*/NULL_TREE,
		src, destsize, data.mode, &data);

  return NULL_RTX;
}

/* Expand expression EXP, which is a call to the strcpy builtin.  Return
   NULL_RTX if we failed the caller should emit a normal call, otherwise
   try to get the result in TARGET, if convenient (and in mode MODE if that's
   convenient).  */

static rtx
expand_builtin_strcpy (tree exp, rtx target)
{
  if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree dest = CALL_EXPR_ARG (exp, 0);
  tree src = CALL_EXPR_ARG (exp, 1);

  if (warn_stringop_overflow)
    {
      access_data data (exp, access_read_write, NULL_TREE, true,
			NULL_TREE, true);
      const int ost = warn_stringop_overflow ? warn_stringop_overflow - 1 : 1;
      compute_objsize (src, ost, &data.src);
      tree dstsize = compute_objsize (dest, ost, &data.dst);
      check_access (exp, /*dstwrite=*/ NULL_TREE,
		    /*maxread=*/ NULL_TREE, /*srcstr=*/ src,
		    dstsize, data.mode, &data);
    }

  if (rtx ret = expand_builtin_strcpy_args (exp, dest, src, target))
    {
      /* Check to see if the argument was declared attribute nonstring
	 and if so, issue a warning since at this point it's not known
	 to be nul-terminated.  */
      tree fndecl = get_callee_fndecl (exp);
      maybe_warn_nonstring_arg (fndecl, exp);
      return ret;
    }

  return NULL_RTX;
}

/* Helper function to do the actual work for expand_builtin_strcpy.  The
   arguments to the builtin_strcpy call DEST and SRC are broken out
   so that this can also be called without constructing an actual CALL_EXPR.
   The other arguments and return value are the same as for
   expand_builtin_strcpy.  */

static rtx
expand_builtin_strcpy_args (tree exp, tree dest, tree src, rtx target)
{
  /* Detect strcpy calls with unterminated arrays..  */
  tree size;
  bool exact;
  if (tree nonstr = unterminated_array (src, &size, &exact))
    {
      /* NONSTR refers to the non-nul terminated constant array.  */
      warn_string_no_nul (EXPR_LOCATION (exp), exp, NULL, src, nonstr,
			  size, exact);
      return NULL_RTX;
    }

  return expand_movstr (dest, src, target, /*retmode=*/ RETURN_BEGIN);
}

/* Expand a call EXP to the stpcpy builtin.
   Return NULL_RTX if we failed the caller should emit a normal call,
   otherwise try to get the result in TARGET, if convenient (and in
   mode MODE if that's convenient).  */

static rtx
expand_builtin_stpcpy_1 (tree exp, rtx target, machine_mode mode)
{
  tree dst, src;
  location_t loc = EXPR_LOCATION (exp);

  if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
    return NULL_RTX;

  dst = CALL_EXPR_ARG (exp, 0);
  src = CALL_EXPR_ARG (exp, 1);

  if (warn_stringop_overflow)
    {
      access_data data (exp, access_read_write);
      tree destsize = compute_objsize (dst, warn_stringop_overflow - 1,
				       &data.dst);
      check_access (exp, /*dstwrite=*/NULL_TREE, /*maxread=*/NULL_TREE,
		    src, destsize, data.mode, &data);
    }

  /* If return value is ignored, transform stpcpy into strcpy.  */
  if (target == const0_rtx && builtin_decl_implicit (BUILT_IN_STRCPY))
    {
      tree fn = builtin_decl_implicit (BUILT_IN_STRCPY);
      tree result = build_call_nofold_loc (loc, fn, 2, dst, src);
      return expand_expr (result, target, mode, EXPAND_NORMAL);
    }
  else
    {
      tree len, lenp1;
      rtx ret;

      /* Ensure we get an actual string whose length can be evaluated at
	 compile-time, not an expression containing a string.  This is
	 because the latter will potentially produce pessimized code
	 when used to produce the return value.  */
      c_strlen_data lendata = { };
      if (!c_getstr (src)
	  || !(len = c_strlen (src, 0, &lendata, 1)))
	return expand_movstr (dst, src, target,
			      /*retmode=*/ RETURN_END_MINUS_ONE);

      if (lendata.decl)
	warn_string_no_nul (EXPR_LOCATION (exp), exp, NULL, src, lendata.decl);

      lenp1 = size_binop_loc (loc, PLUS_EXPR, len, ssize_int (1));
      ret = expand_builtin_mempcpy_args (dst, src, lenp1,
					 target, exp,
					 /*retmode=*/ RETURN_END_MINUS_ONE);

      if (ret)
	return ret;

      if (TREE_CODE (len) == INTEGER_CST)
	{
	  rtx len_rtx = expand_normal (len);

	  if (CONST_INT_P (len_rtx))
	    {
	      ret = expand_builtin_strcpy_args (exp, dst, src, target);

	      if (ret)
		{
		  if (! target)
		    {
		      if (mode != VOIDmode)
			target = gen_reg_rtx (mode);
		      else
			target = gen_reg_rtx (GET_MODE (ret));
		    }
		  if (GET_MODE (target) != GET_MODE (ret))
		    ret = gen_lowpart (GET_MODE (target), ret);

		  ret = plus_constant (GET_MODE (ret), ret, INTVAL (len_rtx));
		  ret = emit_move_insn (target, force_operand (ret, NULL_RTX));
		  gcc_assert (ret);

		  return target;
		}
	    }
	}

      return expand_movstr (dst, src, target,
			    /*retmode=*/ RETURN_END_MINUS_ONE);
    }
}

/* Expand a call EXP to the stpcpy builtin and diagnose uses of nonstring
   arguments while being careful to avoid duplicate warnings (which could
   be issued if the expander were to expand the call, resulting in it
   being emitted in expand_call().  */

static rtx
expand_builtin_stpcpy (tree exp, rtx target, machine_mode mode)
{
  if (rtx ret = expand_builtin_stpcpy_1 (exp, target, mode))
    {
      /* The call has been successfully expanded.  Check for nonstring
	 arguments and issue warnings as appropriate.  */
      maybe_warn_nonstring_arg (get_callee_fndecl (exp), exp);
      return ret;
    }

  return NULL_RTX;
}

/* Check a call EXP to the stpncpy built-in for validity.
   Return NULL_RTX on both success and failure.  */

static rtx
expand_builtin_stpncpy (tree exp, rtx)
{
  if (!validate_arglist (exp,
			 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
      || !warn_stringop_overflow)
    return NULL_RTX;

  /* The source and destination of the call.  */
  tree dest = CALL_EXPR_ARG (exp, 0);
  tree src = CALL_EXPR_ARG (exp, 1);

  /* The exact number of bytes to write (not the maximum).  */
  tree len = CALL_EXPR_ARG (exp, 2);
  access_data data (exp, access_read_write);
  /* The size of the destination object.  */
  tree destsize = compute_objsize (dest, warn_stringop_overflow - 1, &data.dst);
  check_access (exp, len, /*maxread=*/len, src, destsize, data.mode, &data);
  return NULL_RTX;
}

/* Callback routine for store_by_pieces.  Read GET_MODE_BITSIZE (MODE)
   bytes from constant string DATA + OFFSET and return it as target
   constant.  */

rtx
builtin_strncpy_read_str (void *data, void *, HOST_WIDE_INT offset,
			  scalar_int_mode mode)
{
  const char *str = (const char *) data;

  if ((unsigned HOST_WIDE_INT) offset > strlen (str))
    return const0_rtx;

  return c_readstr (str + offset, mode);
}

/* Helper to check the sizes of sequences and the destination of calls
   to __builtin_strncat and __builtin___strncat_chk.  Returns true on
   success (no overflow or invalid sizes), false otherwise.  */

static bool
check_strncat_sizes (tree exp, tree objsize)
{
  tree dest = CALL_EXPR_ARG (exp, 0);
  tree src = CALL_EXPR_ARG (exp, 1);
  tree maxread = CALL_EXPR_ARG (exp, 2);

  /* Try to determine the range of lengths that the source expression
     refers to.  */
  c_strlen_data lendata = { };
  get_range_strlen (src, &lendata, /* eltsize = */ 1);

  /* Try to verify that the destination is big enough for the shortest
     string.  */

  access_data data (exp, access_read_write, maxread, true);
  if (!objsize && warn_stringop_overflow)
    {
      /* If it hasn't been provided by __strncat_chk, try to determine
	 the size of the destination object into which the source is
	 being copied.  */
      objsize = compute_objsize (dest, warn_stringop_overflow - 1, &data.dst);
    }

  /* Add one for the terminating nul.  */
  tree srclen = (lendata.minlen
		 ? fold_build2 (PLUS_EXPR, size_type_node, lendata.minlen,
				size_one_node)
		 : NULL_TREE);

  /* The strncat function copies at most MAXREAD bytes and always appends
     the terminating nul so the specified upper bound should never be equal
     to (or greater than) the size of the destination.  */
  if (tree_fits_uhwi_p (maxread) && tree_fits_uhwi_p (objsize)
      && tree_int_cst_equal (objsize, maxread))
    {
      location_t loc = tree_inlined_location (exp);
      warning_at (loc, OPT_Wstringop_overflow_,
		  "%K%qD specified bound %E equals destination size",
		  exp, get_callee_fndecl (exp), maxread);

      return false;
    }

  if (!srclen
      || (maxread && tree_fits_uhwi_p (maxread)
	  && tree_fits_uhwi_p (srclen)
	  && tree_int_cst_lt (maxread, srclen)))
    srclen = maxread;

  /* The number of bytes to write is LEN but check_access will alsoa
     check SRCLEN if LEN's value isn't known.  */
  return check_access (exp, /*dstwrite=*/NULL_TREE, maxread, srclen,
		       objsize, data.mode, &data);
}

/* Similar to expand_builtin_strcat, do some very basic size validation
   of a call to the strcpy builtin given by EXP.  Return NULL_RTX to have
   the built-in expand to a call to the library function.  */

static rtx
expand_builtin_strncat (tree exp, rtx)
{
  if (!validate_arglist (exp,
			 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
      || !warn_stringop_overflow)
    return NULL_RTX;

  tree dest = CALL_EXPR_ARG (exp, 0);
  tree src = CALL_EXPR_ARG (exp, 1);
  /* The upper bound on the number of bytes to write.  */
  tree maxread = CALL_EXPR_ARG (exp, 2);

  /* Detect unterminated source (only).  */
  if (!check_nul_terminated_array (exp, src, maxread))
    return NULL_RTX;

  /* The length of the source sequence.  */
  tree slen = c_strlen (src, 1);

  /* Try to determine the range of lengths that the source expression
     refers to.  Since the lengths are only used for warning and not
     for code generation disable strict mode below.  */
  tree maxlen = slen;
  if (!maxlen)
    {
      c_strlen_data lendata = { };
      get_range_strlen (src, &lendata, /* eltsize = */ 1);
      maxlen = lendata.maxbound;
    }

  access_data data (exp, access_read_write);
  /* Try to verify that the destination is big enough for the shortest
     string.  First try to determine the size of the destination object
     into which the source is being copied.  */
  tree destsize = compute_objsize (dest, warn_stringop_overflow - 1, &data.dst);

  /* Add one for the terminating nul.  */
  tree srclen = (maxlen
		 ? fold_build2 (PLUS_EXPR, size_type_node, maxlen,
				size_one_node)
		 : NULL_TREE);

  /* The strncat function copies at most MAXREAD bytes and always appends
     the terminating nul so the specified upper bound should never be equal
     to (or greater than) the size of the destination.  */
  if (tree_fits_uhwi_p (maxread) && tree_fits_uhwi_p (destsize)
      && tree_int_cst_equal (destsize, maxread))
    {
      location_t loc = tree_inlined_location (exp);
      warning_at (loc, OPT_Wstringop_overflow_,
		  "%K%qD specified bound %E equals destination size",
		  exp, get_callee_fndecl (exp), maxread);

      return NULL_RTX;
    }

  if (!srclen
      || (maxread && tree_fits_uhwi_p (maxread)
	  && tree_fits_uhwi_p (srclen)
	  && tree_int_cst_lt (maxread, srclen)))
    srclen = maxread;

  check_access (exp, /*dstwrite=*/NULL_TREE, maxread, srclen,
		destsize, data.mode, &data);
  return NULL_RTX;
}

/* Expand expression EXP, which is a call to the strncpy builtin.  Return
   NULL_RTX if we failed the caller should emit a normal call.  */

static rtx
expand_builtin_strncpy (tree exp, rtx target)
{
  location_t loc = EXPR_LOCATION (exp);

  if (!validate_arglist (exp,
			 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;
  tree dest = CALL_EXPR_ARG (exp, 0);
  tree src = CALL_EXPR_ARG (exp, 1);
  /* The number of bytes to write (not the maximum).  */
  tree len = CALL_EXPR_ARG (exp, 2);

  /* The length of the source sequence.  */
  tree slen = c_strlen (src, 1);

  if (warn_stringop_overflow)
    {
      access_data data (exp, access_read_write, len, true, len, true);
      const int ost = warn_stringop_overflow ? warn_stringop_overflow - 1 : 1;
      compute_objsize (src, ost, &data.src);
      tree dstsize = compute_objsize (dest, ost, &data.dst);
      /* The number of bytes to write is LEN but check_access will also
	 check SLEN if LEN's value isn't known.  */
      check_access (exp, /*dstwrite=*/len,
		    /*maxread=*/len, src, dstsize, data.mode, &data);
    }

  /* We must be passed a constant len and src parameter.  */
  if (!tree_fits_uhwi_p (len) || !slen || !tree_fits_uhwi_p (slen))
    return NULL_RTX;

  slen = size_binop_loc (loc, PLUS_EXPR, slen, ssize_int (1));

  /* We're required to pad with trailing zeros if the requested
     len is greater than strlen(s2)+1.  In that case try to
     use store_by_pieces, if it fails, punt.  */
  if (tree_int_cst_lt (slen, len))
    {
      unsigned int dest_align = get_pointer_alignment (dest);
      const char *p = c_getstr (src);
      rtx dest_mem;

      if (!p || dest_align == 0 || !tree_fits_uhwi_p (len)
	  || !can_store_by_pieces (tree_to_uhwi (len),
				   builtin_strncpy_read_str,
				   CONST_CAST (char *, p),
				   dest_align, false))
	return NULL_RTX;

      dest_mem = get_memory_rtx (dest, len);
      store_by_pieces (dest_mem, tree_to_uhwi (len),
		       builtin_strncpy_read_str,
		       CONST_CAST (char *, p), dest_align, false,
		       RETURN_BEGIN);
      dest_mem = force_operand (XEXP (dest_mem, 0), target);
      dest_mem = convert_memory_address (ptr_mode, dest_mem);
      return dest_mem;
    }

  return NULL_RTX;
}

/* Callback routine for store_by_pieces.  Read GET_MODE_BITSIZE (MODE)
   bytes from constant string DATA + OFFSET and return it as target
   constant.  If PREV isn't nullptr, it has the RTL info from the
   previous iteration.  */

rtx
builtin_memset_read_str (void *data, void *prevp,
			 HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
			 scalar_int_mode mode)
{
  by_pieces_prev *prev = (by_pieces_prev *) prevp;
  if (prev != nullptr && prev->data != nullptr)
    {
      /* Use the previous data in the same mode.  */
      if (prev->mode == mode)
	return prev->data;
    }

  const char *c = (const char *) data;
  char *p = XALLOCAVEC (char, GET_MODE_SIZE (mode));

  memset (p, *c, GET_MODE_SIZE (mode));

  return c_readstr (p, mode);
}

/* Callback routine for store_by_pieces.  Return the RTL of a register
   containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
   char value given in the RTL register data.  For example, if mode is
   4 bytes wide, return the RTL for 0x01010101*data.  If PREV isn't
   nullptr, it has the RTL info from the previous iteration.  */

static rtx
builtin_memset_gen_str (void *data, void *prevp,
			HOST_WIDE_INT offset ATTRIBUTE_UNUSED,
			scalar_int_mode mode)
{
  rtx target, coeff;
  size_t size;
  char *p;

  by_pieces_prev *prev = (by_pieces_prev *) prevp;
  if (prev != nullptr && prev->data != nullptr)
    {
      /* Use the previous data in the same mode.  */
      if (prev->mode == mode)
	return prev->data;

      target = simplify_gen_subreg (mode, prev->data, prev->mode, 0);
      if (target != nullptr)
	return target;
    }

  size = GET_MODE_SIZE (mode);
  if (size == 1)
    return (rtx) data;

  p = XALLOCAVEC (char, size);
  memset (p, 1, size);
  coeff = c_readstr (p, mode);

  target = convert_to_mode (mode, (rtx) data, 1);
  target = expand_mult (mode, target, coeff, NULL_RTX, 1);
  return force_reg (mode, target);
}

/* Expand expression EXP, which is a call to the memset builtin.  Return
   NULL_RTX if we failed the caller should emit a normal call, otherwise
   try to get the result in TARGET, if convenient (and in mode MODE if that's
   convenient).  */

static rtx
expand_builtin_memset (tree exp, rtx target, machine_mode mode)
{
  if (!validate_arglist (exp,
 			 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree dest = CALL_EXPR_ARG (exp, 0);
  tree val = CALL_EXPR_ARG (exp, 1);
  tree len = CALL_EXPR_ARG (exp, 2);

  check_memop_access (exp, dest, NULL_TREE, len);

  return expand_builtin_memset_args (dest, val, len, target, mode, exp);
}

/* Try to store VAL (or, if NULL_RTX, VALC) in LEN bytes starting at TO.
   Return TRUE if successful, FALSE otherwise.  TO is assumed to be
   aligned at an ALIGN-bits boundary.  LEN must be a multiple of
   1<<CTZ_LEN between MIN_LEN and MAX_LEN.

   The strategy is to issue one store_by_pieces for each power of two,
   from most to least significant, guarded by a test on whether there
   are at least that many bytes left to copy in LEN.

   ??? Should we skip some powers of two in favor of loops?  Maybe start
   at the max of TO/LEN/word alignment, at least when optimizing for
   size, instead of ensuring O(log len) dynamic compares?  */

bool
try_store_by_multiple_pieces (rtx to, rtx len, unsigned int ctz_len,
			      unsigned HOST_WIDE_INT min_len,
			      unsigned HOST_WIDE_INT max_len,
			      rtx val, char valc, unsigned int align)
{
  int max_bits = floor_log2 (max_len);
  int min_bits = floor_log2 (min_len);
  int sctz_len = ctz_len;

  gcc_checking_assert (sctz_len >= 0);

  if (val)
    valc = 1;

  /* Bits more significant than TST_BITS are part of the shared prefix
     in the binary representation of both min_len and max_len.  Since
     they're identical, we don't need to test them in the loop.  */
  int tst_bits = (max_bits != min_bits ? max_bits
		  : floor_log2 (max_len ^ min_len));

  /* Check whether it's profitable to start by storing a fixed BLKSIZE
     bytes, to lower max_bits.  In the unlikely case of a constant LEN
     (implied by identical MAX_LEN and MIN_LEN), we want to issue a
     single store_by_pieces, but otherwise, select the minimum multiple
     of the ALIGN (in bytes) and of the MCD of the possible LENs, that
     brings MAX_LEN below TST_BITS, if that's lower than min_len.  */
  unsigned HOST_WIDE_INT blksize;
  if (max_len > min_len)
    {
      unsigned HOST_WIDE_INT alrng = MAX (HOST_WIDE_INT_1U << ctz_len,
					  align / BITS_PER_UNIT);
      blksize = max_len - (HOST_WIDE_INT_1U << tst_bits) + alrng;
      blksize &= ~(alrng - 1);
    }
  else if (max_len == min_len)
    blksize = max_len;
  else
    gcc_unreachable ();
  if (min_len >= blksize)
    {
      min_len -= blksize;
      min_bits = floor_log2 (min_len);
      max_len -= blksize;
      max_bits = floor_log2 (max_len);

      tst_bits = (max_bits != min_bits ? max_bits
		 : floor_log2 (max_len ^ min_len));
    }
  else
    blksize = 0;

  /* Check that we can use store by pieces for the maximum store count
     we may issue (initial fixed-size block, plus conditional
     power-of-two-sized from max_bits to ctz_len.  */
  unsigned HOST_WIDE_INT xlenest = blksize;
  if (max_bits >= 0)
    xlenest += ((HOST_WIDE_INT_1U << max_bits) * 2
		- (HOST_WIDE_INT_1U << ctz_len));
  if (!can_store_by_pieces (xlenest, builtin_memset_read_str,
			    &valc, align, true))
    return false;

  rtx (*constfun) (void *, void *, HOST_WIDE_INT, scalar_int_mode);
  void *constfundata;
  if (val)
    {
      constfun = builtin_memset_gen_str;
      constfundata = val = force_reg (TYPE_MODE (unsigned_char_type_node),
				      val);
    }
  else
    {
      constfun = builtin_memset_read_str;
      constfundata = &valc;
    }

  rtx ptr = copy_addr_to_reg (convert_to_mode (ptr_mode, XEXP (to, 0), 0));
  rtx rem = copy_to_mode_reg (ptr_mode, convert_to_mode (ptr_mode, len, 0));
  to = replace_equiv_address (to, ptr);
  set_mem_align (to, align);

  if (blksize)
    {
      to = store_by_pieces (to, blksize,
			    constfun, constfundata,
			    align, true,
			    max_len != 0 ? RETURN_END : RETURN_BEGIN);
      if (max_len == 0)
	return true;

      /* Adjust PTR, TO and REM.  Since TO's address is likely
	 PTR+offset, we have to replace it.  */
      emit_move_insn (ptr, force_operand (XEXP (to, 0), NULL_RTX));
      to = replace_equiv_address (to, ptr);
      rtx rem_minus_blksize = plus_constant (ptr_mode, rem, -blksize);
      emit_move_insn (rem, force_operand (rem_minus_blksize, NULL_RTX));
    }

  /* Iterate over power-of-two block sizes from the maximum length to
     the least significant bit possibly set in the length.  */
  for (int i = max_bits; i >= sctz_len; i--)
    {
      rtx_code_label *label = NULL;
      blksize = HOST_WIDE_INT_1U << i;

      /* If we're past the bits shared between min_ and max_len, expand
	 a test on the dynamic length, comparing it with the
	 BLKSIZE.  */
      if (i <= tst_bits)
	{
	  label = gen_label_rtx ();
	  emit_cmp_and_jump_insns (rem, GEN_INT (blksize), LT, NULL,
				   ptr_mode, 1, label,
				   profile_probability::even ());
	}
      /* If we are at a bit that is in the prefix shared by min_ and
	 max_len, skip this BLKSIZE if the bit is clear.  */
      else if ((max_len & blksize) == 0)
	continue;

      /* Issue a store of BLKSIZE bytes.  */
      to = store_by_pieces (to, blksize,
			    constfun, constfundata,
			    align, true,
			    i != sctz_len ? RETURN_END : RETURN_BEGIN);

      /* Adjust REM and PTR, unless this is the last iteration.  */
      if (i != sctz_len)
	{
	  emit_move_insn (ptr, force_operand (XEXP (to, 0), NULL_RTX));
	  to = replace_equiv_address (to, ptr);
	  rtx rem_minus_blksize = plus_constant (ptr_mode, rem, -blksize);
	  emit_move_insn (rem, force_operand (rem_minus_blksize, NULL_RTX));
	}

      if (label)
	{
	  emit_label (label);

	  /* Given conditional stores, the offset can no longer be
	     known, so clear it.  */
	  clear_mem_offset (to);
	}
    }

  return true;
}

/* Helper function to do the actual work for expand_builtin_memset.  The
   arguments to the builtin_memset call DEST, VAL, and LEN are broken out
   so that this can also be called without constructing an actual CALL_EXPR.
   The other arguments and return value are the same as for
   expand_builtin_memset.  */

static rtx
expand_builtin_memset_args (tree dest, tree val, tree len,
			    rtx target, machine_mode mode, tree orig_exp)
{
  tree fndecl, fn;
  enum built_in_function fcode;
  machine_mode val_mode;
  char c;
  unsigned int dest_align;
  rtx dest_mem, dest_addr, len_rtx;
  HOST_WIDE_INT expected_size = -1;
  unsigned int expected_align = 0;
  unsigned HOST_WIDE_INT min_size;
  unsigned HOST_WIDE_INT max_size;
  unsigned HOST_WIDE_INT probable_max_size;

  dest_align = get_pointer_alignment (dest);

  /* If DEST is not a pointer type, don't do this operation in-line.  */
  if (dest_align == 0)
    return NULL_RTX;

  if (currently_expanding_gimple_stmt)
    stringop_block_profile (currently_expanding_gimple_stmt,
			    &expected_align, &expected_size);

  if (expected_align < dest_align)
    expected_align = dest_align;

  /* If the LEN parameter is zero, return DEST.  */
  if (integer_zerop (len))
    {
      /* Evaluate and ignore VAL in case it has side-effects.  */
      expand_expr (val, const0_rtx, VOIDmode, EXPAND_NORMAL);
      return expand_expr (dest, target, mode, EXPAND_NORMAL);
    }

  /* Stabilize the arguments in case we fail.  */
  dest = builtin_save_expr (dest);
  val = builtin_save_expr (val);
  len = builtin_save_expr (len);

  len_rtx = expand_normal (len);
  determine_block_size (len, len_rtx, &min_size, &max_size,
			&probable_max_size);
  dest_mem = get_memory_rtx (dest, len);
  val_mode = TYPE_MODE (unsigned_char_type_node);

  if (TREE_CODE (val) != INTEGER_CST
      || target_char_cast (val, &c))
    {
      rtx val_rtx;

      val_rtx = expand_normal (val);
      val_rtx = convert_to_mode (val_mode, val_rtx, 0);

      /* Assume that we can memset by pieces if we can store
       * the coefficients by pieces (in the required modes).
       * We can't pass builtin_memset_gen_str as that emits RTL.  */
      c = 1;
      if (tree_fits_uhwi_p (len)
	  && can_store_by_pieces (tree_to_uhwi (len),
				  builtin_memset_read_str, &c, dest_align,
				  true))
	{
	  val_rtx = force_reg (val_mode, val_rtx);
	  store_by_pieces (dest_mem, tree_to_uhwi (len),
			   builtin_memset_gen_str, val_rtx, dest_align,
			   true, RETURN_BEGIN);
	}
      else if (!set_storage_via_setmem (dest_mem, len_rtx, val_rtx,
					dest_align, expected_align,
					expected_size, min_size, max_size,
					probable_max_size)
	       && !try_store_by_multiple_pieces (dest_mem, len_rtx,
						 tree_ctz (len),
						 min_size, max_size,
						 val_rtx, 0,
						 dest_align))
	goto do_libcall;

      dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
      dest_mem = convert_memory_address (ptr_mode, dest_mem);
      return dest_mem;
    }

  if (c)
    {
      if (tree_fits_uhwi_p (len)
	  && can_store_by_pieces (tree_to_uhwi (len),
				  builtin_memset_read_str, &c, dest_align,
				  true))
	store_by_pieces (dest_mem, tree_to_uhwi (len),
			 builtin_memset_read_str, &c, dest_align, true,
			 RETURN_BEGIN);
      else if (!set_storage_via_setmem (dest_mem, len_rtx,
					gen_int_mode (c, val_mode),
					dest_align, expected_align,
					expected_size, min_size, max_size,
					probable_max_size)
	       && !try_store_by_multiple_pieces (dest_mem, len_rtx,
						 tree_ctz (len),
						 min_size, max_size,
						 NULL_RTX, c,
						 dest_align))
	goto do_libcall;

      dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
      dest_mem = convert_memory_address (ptr_mode, dest_mem);
      return dest_mem;
    }

  set_mem_align (dest_mem, dest_align);
  dest_addr = clear_storage_hints (dest_mem, len_rtx,
				   CALL_EXPR_TAILCALL (orig_exp)
				   ? BLOCK_OP_TAILCALL : BLOCK_OP_NORMAL,
				   expected_align, expected_size,
				   min_size, max_size,
				   probable_max_size, tree_ctz (len));

  if (dest_addr == 0)
    {
      dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
      dest_addr = convert_memory_address (ptr_mode, dest_addr);
    }

  return dest_addr;

 do_libcall:
  fndecl = get_callee_fndecl (orig_exp);
  fcode = DECL_FUNCTION_CODE (fndecl);
  if (fcode == BUILT_IN_MEMSET)
    fn = build_call_nofold_loc (EXPR_LOCATION (orig_exp), fndecl, 3,
				dest, val, len);
  else if (fcode == BUILT_IN_BZERO)
    fn = build_call_nofold_loc (EXPR_LOCATION (orig_exp), fndecl, 2,
				dest, len);
  else
    gcc_unreachable ();
  gcc_assert (TREE_CODE (fn) == CALL_EXPR);
  CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (orig_exp);
  return expand_call (fn, target, target == const0_rtx);
}

/* Expand expression EXP, which is a call to the bzero builtin.  Return
   NULL_RTX if we failed the caller should emit a normal call.  */

static rtx
expand_builtin_bzero (tree exp)
{
  if (!validate_arglist (exp, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree dest = CALL_EXPR_ARG (exp, 0);
  tree size = CALL_EXPR_ARG (exp, 1);

  check_memop_access (exp, dest, NULL_TREE, size);

  /* New argument list transforming bzero(ptr x, int y) to
     memset(ptr x, int 0, size_t y).   This is done this way
     so that if it isn't expanded inline, we fallback to
     calling bzero instead of memset.  */

  location_t loc = EXPR_LOCATION (exp);

  return expand_builtin_memset_args (dest, integer_zero_node,
				     fold_convert_loc (loc,
						       size_type_node, size),
				     const0_rtx, VOIDmode, exp);
}

/* Try to expand cmpstr operation ICODE with the given operands.
   Return the result rtx on success, otherwise return null.  */

static rtx
expand_cmpstr (insn_code icode, rtx target, rtx arg1_rtx, rtx arg2_rtx,
	       HOST_WIDE_INT align)
{
  machine_mode insn_mode = insn_data[icode].operand[0].mode;

  if (target && (!REG_P (target) || HARD_REGISTER_P (target)))
    target = NULL_RTX;

  class expand_operand ops[4];
  create_output_operand (&ops[0], target, insn_mode);
  create_fixed_operand (&ops[1], arg1_rtx);
  create_fixed_operand (&ops[2], arg2_rtx);
  create_integer_operand (&ops[3], align);
  if (maybe_expand_insn (icode, 4, ops))
    return ops[0].value;
  return NULL_RTX;
}

/* Expand expression EXP, which is a call to the memcmp built-in function.
   Return NULL_RTX if we failed and the caller should emit a normal call,
   otherwise try to get the result in TARGET, if convenient.
   RESULT_EQ is true if we can relax the returned value to be either zero
   or nonzero, without caring about the sign.  */

static rtx
expand_builtin_memcmp (tree exp, rtx target, bool result_eq)
{
  if (!validate_arglist (exp,
 			 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree arg1 = CALL_EXPR_ARG (exp, 0);
  tree arg2 = CALL_EXPR_ARG (exp, 1);
  tree len = CALL_EXPR_ARG (exp, 2);

  /* Diagnose calls where the specified length exceeds the size of either
     object.  */
  if (!check_read_access (exp, arg1, len, 0)
      || !check_read_access (exp, arg2, len, 0))
    return NULL_RTX;

  /* Due to the performance benefit, always inline the calls first
     when result_eq is false.  */
  rtx result = NULL_RTX;
  enum built_in_function fcode = DECL_FUNCTION_CODE (get_callee_fndecl (exp));
  if (!result_eq && fcode != BUILT_IN_BCMP)
    {
      result = inline_expand_builtin_bytecmp (exp, target);
      if (result)
	return result;
    }

  machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
  location_t loc = EXPR_LOCATION (exp);

  unsigned int arg1_align = get_pointer_alignment (arg1) / BITS_PER_UNIT;
  unsigned int arg2_align = get_pointer_alignment (arg2) / BITS_PER_UNIT;

  /* If we don't have POINTER_TYPE, call the function.  */
  if (arg1_align == 0 || arg2_align == 0)
    return NULL_RTX;

  rtx arg1_rtx = get_memory_rtx (arg1, len);
  rtx arg2_rtx = get_memory_rtx (arg2, len);
  rtx len_rtx = expand_normal (fold_convert_loc (loc, sizetype, len));

  /* Set MEM_SIZE as appropriate.  */
  if (CONST_INT_P (len_rtx))
    {
      set_mem_size (arg1_rtx, INTVAL (len_rtx));
      set_mem_size (arg2_rtx, INTVAL (len_rtx));
    }

  by_pieces_constfn constfn = NULL;

  /* Try to get the byte representation of the constant ARG2 (or, only
     when the function's result is used for equality to zero, ARG1)
     points to, with its byte size in NBYTES.  */
  unsigned HOST_WIDE_INT nbytes;
  const char *rep = getbyterep (arg2, &nbytes);
  if (result_eq && rep == NULL)
    {
      /* For equality to zero the arguments are interchangeable.  */
      rep = getbyterep (arg1, &nbytes);
      if (rep != NULL)
	std::swap (arg1_rtx, arg2_rtx);
    }

  /* If the function's constant bound LEN_RTX is less than or equal
     to the byte size of the representation of the constant argument,
     and if block move would be done by pieces, we can avoid loading
     the bytes from memory and only store the computed constant result.  */
  if (rep
      && CONST_INT_P (len_rtx)
      && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= nbytes)
    constfn = builtin_memcpy_read_str;

  result = emit_block_cmp_hints (arg1_rtx, arg2_rtx, len_rtx,
				 TREE_TYPE (len), target,
				 result_eq, constfn,
				 CONST_CAST (char *, rep));

  if (result)
    {
      /* Return the value in the proper mode for this function.  */
      if (GET_MODE (result) == mode)
	return result;

      if (target != 0)
	{
	  convert_move (target, result, 0);
	  return target;
	}

      return convert_to_mode (mode, result, 0);
    }

  return NULL_RTX;
}

/* Expand expression EXP, which is a call to the strcmp builtin.  Return NULL_RTX
   if we failed the caller should emit a normal call, otherwise try to get
   the result in TARGET, if convenient.  */

static rtx
expand_builtin_strcmp (tree exp, ATTRIBUTE_UNUSED rtx target)
{
  if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree arg1 = CALL_EXPR_ARG (exp, 0);
  tree arg2 = CALL_EXPR_ARG (exp, 1);

  if (!check_read_access (exp, arg1)
      || !check_read_access (exp, arg2))
    return NULL_RTX;

  /* Due to the performance benefit, always inline the calls first.  */
  rtx result = NULL_RTX;
  result = inline_expand_builtin_bytecmp (exp, target);
  if (result)
    return result;

  insn_code cmpstr_icode = direct_optab_handler (cmpstr_optab, SImode);
  insn_code cmpstrn_icode = direct_optab_handler (cmpstrn_optab, SImode);
  if (cmpstr_icode == CODE_FOR_nothing && cmpstrn_icode == CODE_FOR_nothing)
    return NULL_RTX;

  unsigned int arg1_align = get_pointer_alignment (arg1) / BITS_PER_UNIT;
  unsigned int arg2_align = get_pointer_alignment (arg2) / BITS_PER_UNIT;

  /* If we don't have POINTER_TYPE, call the function.  */
  if (arg1_align == 0 || arg2_align == 0)
    return NULL_RTX;

  /* Stabilize the arguments in case gen_cmpstr(n)si fail.  */
  arg1 = builtin_save_expr (arg1);
  arg2 = builtin_save_expr (arg2);

  rtx arg1_rtx = get_memory_rtx (arg1, NULL);
  rtx arg2_rtx = get_memory_rtx (arg2, NULL);

  /* Try to call cmpstrsi.  */
  if (cmpstr_icode != CODE_FOR_nothing)
    result = expand_cmpstr (cmpstr_icode, target, arg1_rtx, arg2_rtx,
			    MIN (arg1_align, arg2_align));

  /* Try to determine at least one length and call cmpstrnsi.  */
  if (!result && cmpstrn_icode != CODE_FOR_nothing)
    {
      tree len;
      rtx arg3_rtx;

      tree len1 = c_strlen (arg1, 1);
      tree len2 = c_strlen (arg2, 1);

      if (len1)
	len1 = size_binop (PLUS_EXPR, ssize_int (1), len1);
      if (len2)
	len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);

      /* If we don't have a constant length for the first, use the length
	 of the second, if we know it.  We don't require a constant for
	 this case; some cost analysis could be done if both are available
	 but neither is constant.  For now, assume they're equally cheap,
	 unless one has side effects.  If both strings have constant lengths,
	 use the smaller.  */

      if (!len1)
	len = len2;
      else if (!len2)
	len = len1;
      else if (TREE_SIDE_EFFECTS (len1))
	len = len2;
      else if (TREE_SIDE_EFFECTS (len2))
	len = len1;
      else if (TREE_CODE (len1) != INTEGER_CST)
	len = len2;
      else if (TREE_CODE (len2) != INTEGER_CST)
	len = len1;
      else if (tree_int_cst_lt (len1, len2))
	len = len1;
      else
	len = len2;

      /* If both arguments have side effects, we cannot optimize.  */
      if (len && !TREE_SIDE_EFFECTS (len))
	{
	  arg3_rtx = expand_normal (len);
	  result = expand_cmpstrn_or_cmpmem
	    (cmpstrn_icode, target, arg1_rtx, arg2_rtx, TREE_TYPE (len),
	     arg3_rtx, MIN (arg1_align, arg2_align));
	}
    }

  tree fndecl = get_callee_fndecl (exp);
  if (result)
    {
      /* Check to see if the argument was declared attribute nonstring
	 and if so, issue a warning since at this point it's not known
	 to be nul-terminated.  */
      maybe_warn_nonstring_arg (fndecl, exp);

      /* Return the value in the proper mode for this function.  */
      machine_mode mode = TYPE_MODE (TREE_TYPE (exp));
      if (GET_MODE (result) == mode)
	return result;
      if (target == 0)
	return convert_to_mode (mode, result, 0);
      convert_move (target, result, 0);
      return target;
    }

  /* Expand the library call ourselves using a stabilized argument
     list to avoid re-evaluating the function's arguments twice.  */
  tree fn = build_call_nofold_loc (EXPR_LOCATION (exp), fndecl, 2, arg1, arg2);
  gcc_assert (TREE_CODE (fn) == CALL_EXPR);
  CALL_EXPR_TAILCALL (fn) = CALL_EXPR_TAILCALL (exp);
  return expand_call (fn, target, target == const0_rtx);
}

/* Expand expression EXP, which is a call to the strncmp builtin. Return
   NULL_RTX if we failed the caller should emit a normal call, otherwise
   try to get the result in TARGET, if convenient.  */

static rtx
expand_builtin_strncmp (tree exp, ATTRIBUTE_UNUSED rtx target,
			ATTRIBUTE_UNUSED machine_mode mode)
{
  if (!validate_arglist (exp,
 			 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tree arg1 = CALL_EXPR_ARG (exp, 0);
  tree arg2 = CALL_EXPR_ARG (exp, 1);
  tree arg3 = CALL_EXPR_ARG (exp, 2);

  if (!check_nul_terminated_array (exp, arg1, arg3)
      || !check_nul_terminated_array (exp, arg2, arg3))
    return NULL_RTX;

  location_t loc = tree_inlined_location (exp);
  tree len1 = c_strlen (arg1, 1);
  tree len2 = c_strlen (arg2, 1);

  if (!len1 || !len2)
    {
      /* Check to see if the argument was declared attribute nonstring
	 and if so, issue a warning since at this point it's not known
	 to be nul-terminated.  */
      if (!maybe_warn_nonstring_arg (get_callee_fndecl (exp), exp)
	  && !len1 && !len2)
	{
	  /* A strncmp read is constrained not just by the bound but
	     also by the length of the shorter string.  Specifying
	     a bound that's larger than the size of either array makes
	     no sense and is likely a bug.  When the length of neither
	     of the two strings is known but the sizes of both of
	     the arrays they are stored in is, issue a warning if
	     the bound is larger than than the size of the larger
	     of the two arrays.  */

	  access_ref ref1 (arg3, true);
	  access_ref ref2 (arg3, true);

	  tree bndrng[2] = { NULL_TREE, NULL_TREE };
	  get_size_range (arg3, bndrng, ref1.bndrng);

	  tree size1 = compute_objsize (arg1, 1, &ref1);
	  tree size2 = compute_objsize (arg2, 1, &ref2);
	  tree func = get_callee_fndecl (exp);

	  if (size1 && size2 && bndrng[0] && !integer_zerop (bndrng[0]))
	    {
	      offset_int rem1 = ref1.size_remaining ();
	      offset_int rem2 = ref2.size_remaining ();
	      if (rem1 == 0 || rem2 == 0)
		maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp, func,
				      bndrng, integer_zero_node);
	      else
		{
		  offset_int maxrem = wi::max (rem1, rem2, UNSIGNED);
		  if (maxrem < wi::to_offset (bndrng[0]))
		    maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp,
					  func, bndrng,
					  wide_int_to_tree (sizetype, maxrem));
		}
	    }
	  else if (bndrng[0]
		   && !integer_zerop (bndrng[0])
		   && ((size1 && integer_zerop (size1))
		       || (size2 && integer_zerop (size2))))
	    maybe_warn_for_bound (OPT_Wstringop_overread, loc, exp, func,
				  bndrng, integer_zero_node);
	}
    }

  /* Due to the performance benefit, always inline the calls first.  */
  rtx result = NULL_RTX;
  result = inline_expand_builtin_bytecmp (exp, target);
  if (result)
    return result;

  /* If c_strlen can determine an expression for one of the string
     lengths, and it doesn't have side effects, then emit cmpstrnsi
     using length MIN(strlen(string)+1, arg3).  */
  insn_code cmpstrn_icode = direct_optab_handler (cmpstrn_optab, SImode);
  if (cmpstrn_icode == CODE_FOR_nothing)
    return NULL_RTX;

  tree len;

  unsigned int arg1_align = get_pointer_alignment (arg1) / BITS_PER_UNIT;
  unsigned int arg2_align = get_pointer_alignment (arg2) / BITS_PER_UNIT;

  if (len1)
    len1 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len1);
  if (len2)
    len2 = size_binop_loc (loc, PLUS_EXPR, ssize_int (1), len2);

  tree len3 = fold_convert_loc (loc, sizetype, arg3);

  /* If we don't have a constant length for the first, use the length
     of the second, if we know it.  If neither string is constant length,
     use the given length argument.  We don't require a constant for
     this case; some cost analysis could be done if both are available
     but neither is constant.  For now, assume they're equally cheap,
     unless one has side effects.  If both strings have constant lengths,
     use the smaller.  */

  if (!len1 && !len2)
    len = len3;
  else if (!len1)
    len = len2;
  else if (!len2)
    len = len1;
  else if (TREE_SIDE_EFFECTS (len1))
    len = len2;
  else if (TREE_SIDE_EFFECTS (len2))
    len = len1;
  else if (TREE_CODE (len1) != INTEGER_CST)
    len = len2;
  else if (TREE_CODE (len2) != INTEGER_CST)
    len = len1;
  else if (tree_int_cst_lt (len1, len2))
    len = len1;
  else
    len = len2;

  /* If we are not using the given length, we must incorporate it here.
     The actual new length parameter will be MIN(len,arg3) in this case.  */
  if (len != len3)
    {
      len = fold_convert_loc (loc, sizetype, len);
      len = fold_build2_loc (loc, MIN_EXPR, TREE_TYPE (len), len, len3);
    }
  rtx arg1_rtx = get_memory_rtx (arg1, len);
  rtx arg2_rtx = get_memory_rtx (arg2, len);
  rtx arg3_rtx = expand_normal (len);
  result = expand_cmpstrn_or_cmpmem (cmpstrn_icode, target, arg1_rtx,
				     arg2_rtx, TREE_TYPE (len), arg3_rtx,
				     MIN (arg1_align, arg2_align));

  tree fndecl = get_callee_fndecl (exp);
  if (result)
    {
      /* Return the value in the proper mode for this function.  */
      mode = TYPE_MODE (TREE_TYPE (exp));
      if (GET_MODE (result) == mode)
	return result;
      if (target == 0)
	return convert_to_mode (mode, result, 0);
      convert_move (target, result, 0);
      return target;
    }

  /* Expand the library call ourselves using a stabilized argument
     list to avoid re-evaluating the function's arguments twice.  */
  tree call = build_call_nofold_loc (loc, fndecl, 3, arg1, arg2, len);
  if (TREE_NO_WARNING (exp))
    TREE_NO_WARNING (call) = true;
  gcc_assert (TREE_CODE (call) == CALL_EXPR);
  CALL_EXPR_TAILCALL (call) = CALL_EXPR_TAILCALL (exp);
  return expand_call (call, target, target == const0_rtx);
}

/* Expand a call to __builtin_saveregs, generating the result in TARGET,
   if that's convenient.  */

rtx
expand_builtin_saveregs (void)
{
  rtx val;
  rtx_insn *seq;

  /* Don't do __builtin_saveregs more than once in a function.
     Save the result of the first call and reuse it.  */
  if (saveregs_value != 0)
    return saveregs_value;

  /* When this function is called, it means that registers must be
     saved on entry to this function.  So we migrate the call to the
     first insn of this function.  */

  start_sequence ();

  /* Do whatever the machine needs done in this case.  */
  val = targetm.calls.expand_builtin_saveregs ();

  seq = get_insns ();
  end_sequence ();

  saveregs_value = val;

  /* Put the insns after the NOTE that starts the function.  If this
     is inside a start_sequence, make the outer-level insn chain current, so
     the code is placed at the start of the function.  */
  push_topmost_sequence ();
  emit_insn_after (seq, entry_of_function ());
  pop_topmost_sequence ();

  return val;
}

/* Expand a call to __builtin_next_arg.  */

static rtx
expand_builtin_next_arg (void)
{
  /* Checking arguments is already done in fold_builtin_next_arg
     that must be called before this function.  */
  return expand_binop (ptr_mode, add_optab,
		       crtl->args.internal_arg_pointer,
		       crtl->args.arg_offset_rtx,
		       NULL_RTX, 0, OPTAB_LIB_WIDEN);
}

/* Make it easier for the backends by protecting the valist argument
   from multiple evaluations.  */

static tree
stabilize_va_list_loc (location_t loc, tree valist, int needs_lvalue)
{
  tree vatype = targetm.canonical_va_list_type (TREE_TYPE (valist));

  /* The current way of determining the type of valist is completely
     bogus.  We should have the information on the va builtin instead.  */
  if (!vatype)
    vatype = targetm.fn_abi_va_list (cfun->decl);

  if (TREE_CODE (vatype) == ARRAY_TYPE)
    {
      if (TREE_SIDE_EFFECTS (valist))
	valist = save_expr (valist);

      /* For this case, the backends will be expecting a pointer to
	 vatype, but it's possible we've actually been given an array
	 (an actual TARGET_CANONICAL_VA_LIST_TYPE (valist)).
	 So fix it.  */
      if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
	{
	  tree p1 = build_pointer_type (TREE_TYPE (vatype));
	  valist = build_fold_addr_expr_with_type_loc (loc, valist, p1);
	}
    }
  else
    {
      tree pt = build_pointer_type (vatype);

      if (! needs_lvalue)
	{
	  if (! TREE_SIDE_EFFECTS (valist))
	    return valist;

	  valist = fold_build1_loc (loc, ADDR_EXPR, pt, valist);
	  TREE_SIDE_EFFECTS (valist) = 1;
	}

      if (TREE_SIDE_EFFECTS (valist))
	valist = save_expr (valist);
      valist = fold_build2_loc (loc, MEM_REF,
				vatype, valist, build_int_cst (pt, 0));
    }

  return valist;
}

/* The "standard" definition of va_list is void*.  */

tree
std_build_builtin_va_list (void)
{
  return ptr_type_node;
}

/* The "standard" abi va_list is va_list_type_node.  */

tree
std_fn_abi_va_list (tree fndecl ATTRIBUTE_UNUSED)
{
  return va_list_type_node;
}

/* The "standard" type of va_list is va_list_type_node.  */

tree
std_canonical_va_list_type (tree type)
{
  tree wtype, htype;

  wtype = va_list_type_node;
  htype = type;

  if (TREE_CODE (wtype) == ARRAY_TYPE)
    {
      /* If va_list is an array type, the argument may have decayed
	 to a pointer type, e.g. by being passed to another function.
	 In that case, unwrap both types so that we can compare the
	 underlying records.  */
      if (TREE_CODE (htype) == ARRAY_TYPE
	  || POINTER_TYPE_P (htype))
	{
	  wtype = TREE_TYPE (wtype);
	  htype = TREE_TYPE (htype);
	}
    }
  if (TYPE_MAIN_VARIANT (wtype) == TYPE_MAIN_VARIANT (htype))
    return va_list_type_node;

  return NULL_TREE;
}

/* The "standard" implementation of va_start: just assign `nextarg' to
   the variable.  */

void
std_expand_builtin_va_start (tree valist, rtx nextarg)
{
  rtx va_r = expand_expr (valist, NULL_RTX, VOIDmode, EXPAND_WRITE);
  convert_move (va_r, nextarg, 0);
}

/* Expand EXP, a call to __builtin_va_start.  */

static rtx
expand_builtin_va_start (tree exp)
{
  rtx nextarg;
  tree valist;
  location_t loc = EXPR_LOCATION (exp);

  if (call_expr_nargs (exp) < 2)
    {
      error_at (loc, "too few arguments to function %<va_start%>");
      return const0_rtx;
    }

  if (fold_builtin_next_arg (exp, true))
    return const0_rtx;

  nextarg = expand_builtin_next_arg ();
  valist = stabilize_va_list_loc (loc, CALL_EXPR_ARG (exp, 0), 1);

  if (targetm.expand_builtin_va_start)
    targetm.expand_builtin_va_start (valist, nextarg);
  else
    std_expand_builtin_va_start (valist, nextarg);

  return const0_rtx;
}

/* Expand EXP, a call to __builtin_va_end.  */

static rtx
expand_builtin_va_end (tree exp)
{
  tree valist = CALL_EXPR_ARG (exp, 0);

  /* Evaluate for side effects, if needed.  I hate macros that don't
     do that.  */
  if (TREE_SIDE_EFFECTS (valist))
    expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);

  return const0_rtx;
}

/* Expand EXP, a call to __builtin_va_copy.  We do this as a
   builtin rather than just as an assignment in stdarg.h because of the
   nastiness of array-type va_list types.  */

static rtx
expand_builtin_va_copy (tree exp)
{
  tree dst, src, t;
  location_t loc = EXPR_LOCATION (exp);

  dst = CALL_EXPR_ARG (exp, 0);
  src = CALL_EXPR_ARG (exp, 1);

  dst = stabilize_va_list_loc (loc, dst, 1);
  src = stabilize_va_list_loc (loc, src, 0);

  gcc_assert (cfun != NULL && cfun->decl != NULL_TREE);

  if (TREE_CODE (targetm.fn_abi_va_list (cfun->decl)) != ARRAY_TYPE)
    {
      t = build2 (MODIFY_EXPR, targetm.fn_abi_va_list (cfun->decl), dst, src);
      TREE_SIDE_EFFECTS (t) = 1;
      expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
    }
  else
    {
      rtx dstb, srcb, size;

      /* Evaluate to pointers.  */
      dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
      srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
      size = expand_expr (TYPE_SIZE_UNIT (targetm.fn_abi_va_list (cfun->decl)),
      		  NULL_RTX, VOIDmode, EXPAND_NORMAL);

      dstb = convert_memory_address (Pmode, dstb);
      srcb = convert_memory_address (Pmode, srcb);

      /* "Dereference" to BLKmode memories.  */
      dstb = gen_rtx_MEM (BLKmode, dstb);
      set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
      set_mem_align (dstb, TYPE_ALIGN (targetm.fn_abi_va_list (cfun->decl)));
      srcb = gen_rtx_MEM (BLKmode, srcb);
      set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
      set_mem_align (srcb, TYPE_ALIGN (targetm.fn_abi_va_list (cfun->decl)));

      /* Copy.  */
      emit_block_move (dstb, srcb, size, BLOCK_OP_NORMAL);
    }

  return const0_rtx;
}

/* Expand a call to one of the builtin functions __builtin_frame_address or
   __builtin_return_address.  */

static rtx
expand_builtin_frame_address (tree fndecl, tree exp)
{
  /* The argument must be a nonnegative integer constant.
     It counts the number of frames to scan up the stack.
     The value is either the frame pointer value or the return
     address saved in that frame.  */
  if (call_expr_nargs (exp) == 0)
    /* Warning about missing arg was already issued.  */
    return const0_rtx;
  else if (! tree_fits_uhwi_p (CALL_EXPR_ARG (exp, 0)))
    {
      error ("invalid argument to %qD", fndecl);
      return const0_rtx;
    }
  else
    {
      /* Number of frames to scan up the stack.  */
      unsigned HOST_WIDE_INT count = tree_to_uhwi (CALL_EXPR_ARG (exp, 0));

      rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl), count);

      /* Some ports cannot access arbitrary stack frames.  */
      if (tem == NULL)
	{
	  warning (0, "unsupported argument to %qD", fndecl);
	  return const0_rtx;
	}

      if (count)
	{
	  /* Warn since no effort is made to ensure that any frame
	     beyond the current one exists or can be safely reached.  */
	  warning (OPT_Wframe_address, "calling %qD with "
		   "a nonzero argument is unsafe", fndecl);
	}

      /* For __builtin_frame_address, return what we've got.  */
      if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
	return tem;

      if (!REG_P (tem)
	  && ! CONSTANT_P (tem))
	tem = copy_addr_to_reg (tem);
      return tem;
    }
}

/* Expand EXP, a call to the alloca builtin.  Return NULL_RTX if we
   failed and the caller should emit a normal call.  */

static rtx
expand_builtin_alloca (tree exp)
{
  rtx op0;
  rtx result;
  unsigned int align;
  tree fndecl = get_callee_fndecl (exp);
  HOST_WIDE_INT max_size;
  enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
  bool alloca_for_var = CALL_ALLOCA_FOR_VAR_P (exp);
  bool valid_arglist
    = (fcode == BUILT_IN_ALLOCA_WITH_ALIGN_AND_MAX
       ? validate_arglist (exp, INTEGER_TYPE, INTEGER_TYPE, INTEGER_TYPE,
			   VOID_TYPE)
       : fcode == BUILT_IN_ALLOCA_WITH_ALIGN
	 ? validate_arglist (exp, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE)
	 : validate_arglist (exp, INTEGER_TYPE, VOID_TYPE));

  if (!valid_arglist)
    return NULL_RTX;

  if ((alloca_for_var
       && warn_vla_limit >= HOST_WIDE_INT_MAX
       && warn_alloc_size_limit < warn_vla_limit)
      || (!alloca_for_var
	  && warn_alloca_limit >= HOST_WIDE_INT_MAX
	  && warn_alloc_size_limit < warn_alloca_limit
	  ))
    {
      /* -Walloca-larger-than and -Wvla-larger-than settings of
	 less than HOST_WIDE_INT_MAX override the more general
	 -Walloc-size-larger-than so unless either of the former
	 options is smaller than the last one (wchich would imply
	 that the call was already checked), check the alloca
	 arguments for overflow.  */
      tree args[] = { CALL_EXPR_ARG (exp, 0), NULL_TREE };
      int idx[] = { 0, -1 };
      maybe_warn_alloc_args_overflow (fndecl, exp, args, idx);
    }

  /* Compute the argument.  */
  op0 = expand_normal (CALL_EXPR_ARG (exp, 0));

  /* Compute the alignment.  */
  align = (fcode == BUILT_IN_ALLOCA
	   ? BIGGEST_ALIGNMENT
	   : TREE_INT_CST_LOW (CALL_EXPR_ARG (exp, 1)));

  /* Compute the maximum size.  */
  max_size = (fcode == BUILT_IN_ALLOCA_WITH_ALIGN_AND_MAX
              ? TREE_INT_CST_LOW (CALL_EXPR_ARG (exp, 2))
              : -1);

  /* Allocate the desired space.  If the allocation stems from the declaration
     of a variable-sized object, it cannot accumulate.  */
  result
    = allocate_dynamic_stack_space (op0, 0, align, max_size, alloca_for_var);
  result = convert_memory_address (ptr_mode, result);

  /* Dynamic allocations for variables are recorded during gimplification.  */
  if (!alloca_for_var && (flag_callgraph_info & CALLGRAPH_INFO_DYNAMIC_ALLOC))
    record_dynamic_alloc (exp);

  return result;
}

/* Emit a call to __asan_allocas_unpoison call in EXP.  Add to second argument
   of the call virtual_stack_dynamic_rtx - stack_pointer_rtx, which is the
   STACK_DYNAMIC_OFFSET value.  See motivation for this in comment to
   handle_builtin_stack_restore function.  */

static rtx
expand_asan_emit_allocas_unpoison (tree exp)
{
  tree arg0 = CALL_EXPR_ARG (exp, 0);
  tree arg1 = CALL_EXPR_ARG (exp, 1);
  rtx top = expand_expr (arg0, NULL_RTX, ptr_mode, EXPAND_NORMAL);
  rtx bot = expand_expr (arg1, NULL_RTX, ptr_mode, EXPAND_NORMAL);
  rtx off = expand_simple_binop (Pmode, MINUS, virtual_stack_dynamic_rtx,
				 stack_pointer_rtx, NULL_RTX, 0,
				 OPTAB_LIB_WIDEN);
  off = convert_modes (ptr_mode, Pmode, off, 0);
  bot = expand_simple_binop (ptr_mode, PLUS, bot, off, NULL_RTX, 0,
			     OPTAB_LIB_WIDEN);
  rtx ret = init_one_libfunc ("__asan_allocas_unpoison");
  ret = emit_library_call_value (ret, NULL_RTX, LCT_NORMAL, ptr_mode,
				 top, ptr_mode, bot, ptr_mode);
  return ret;
}

/* Expand a call to bswap builtin in EXP.
   Return NULL_RTX if a normal call should be emitted rather than expanding the
   function in-line.  If convenient, the result should be placed in TARGET.
   SUBTARGET may be used as the target for computing one of EXP's operands.  */

static rtx
expand_builtin_bswap (machine_mode target_mode, tree exp, rtx target,
		      rtx subtarget)
{
  tree arg;
  rtx op0;

  if (!validate_arglist (exp, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);
  op0 = expand_expr (arg,
		     subtarget && GET_MODE (subtarget) == target_mode
		     ? subtarget : NULL_RTX,
		     target_mode, EXPAND_NORMAL);
  if (GET_MODE (op0) != target_mode)
    op0 = convert_to_mode (target_mode, op0, 1);

  target = expand_unop (target_mode, bswap_optab, op0, target, 1);

  gcc_assert (target);

  return convert_to_mode (target_mode, target, 1);
}

/* Expand a call to a unary builtin in EXP.
   Return NULL_RTX if a normal call should be emitted rather than expanding the
   function in-line.  If convenient, the result should be placed in TARGET.
   SUBTARGET may be used as the target for computing one of EXP's operands.  */

static rtx
expand_builtin_unop (machine_mode target_mode, tree exp, rtx target,
		     rtx subtarget, optab op_optab)
{
  rtx op0;

  if (!validate_arglist (exp, INTEGER_TYPE, VOID_TYPE))
    return NULL_RTX;

  /* Compute the argument.  */
  op0 = expand_expr (CALL_EXPR_ARG (exp, 0),
		     (subtarget
		      && (TYPE_MODE (TREE_TYPE (CALL_EXPR_ARG (exp, 0)))
			  == GET_MODE (subtarget))) ? subtarget : NULL_RTX,
		     VOIDmode, EXPAND_NORMAL);
  /* Compute op, into TARGET if possible.
     Set TARGET to wherever the result comes back.  */
  target = expand_unop (TYPE_MODE (TREE_TYPE (CALL_EXPR_ARG (exp, 0))),
			op_optab, op0, target, op_optab != clrsb_optab);
  gcc_assert (target);

  return convert_to_mode (target_mode, target, 0);
}

/* Expand a call to __builtin_expect.  We just return our argument
   as the builtin_expect semantic should've been already executed by
   tree branch prediction pass. */

static rtx
expand_builtin_expect (tree exp, rtx target)
{
  tree arg;

  if (call_expr_nargs (exp) < 2)
    return const0_rtx;
  arg = CALL_EXPR_ARG (exp, 0);

  target = expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
  /* When guessing was done, the hints should be already stripped away.  */
  gcc_assert (!flag_guess_branch_prob
	      || optimize == 0 || seen_error ());
  return target;
}

/* Expand a call to __builtin_expect_with_probability.  We just return our
   argument as the builtin_expect semantic should've been already executed by
   tree branch prediction pass.  */

static rtx
expand_builtin_expect_with_probability (tree exp, rtx target)
{
  tree arg;

  if (call_expr_nargs (exp) < 3)
    return const0_rtx;
  arg = CALL_EXPR_ARG (exp, 0);

  target = expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
  /* When guessing was done, the hints should be already stripped away.  */
  gcc_assert (!flag_guess_branch_prob
	      || optimize == 0 || seen_error ());
  return target;
}


/* Expand a call to __builtin_assume_aligned.  We just return our first
   argument as the builtin_assume_aligned semantic should've been already
   executed by CCP.  */

static rtx
expand_builtin_assume_aligned (tree exp, rtx target)
{
  if (call_expr_nargs (exp) < 2)
    return const0_rtx;
  target = expand_expr (CALL_EXPR_ARG (exp, 0), target, VOIDmode,
			EXPAND_NORMAL);
  gcc_assert (!TREE_SIDE_EFFECTS (CALL_EXPR_ARG (exp, 1))
	      && (call_expr_nargs (exp) < 3
		  || !TREE_SIDE_EFFECTS (CALL_EXPR_ARG (exp, 2))));
  return target;
}

void
expand_builtin_trap (void)
{
  if (targetm.have_trap ())
    {
      rtx_insn *insn = emit_insn (targetm.gen_trap ());
      /* For trap insns when not accumulating outgoing args force
	 REG_ARGS_SIZE note to prevent crossjumping of calls with
	 different args sizes.  */
      if (!ACCUMULATE_OUTGOING_ARGS)
	add_args_size_note (insn, stack_pointer_delta);
    }
  else
    {
      tree fn = builtin_decl_implicit (BUILT_IN_ABORT);
      tree call_expr = build_call_expr (fn, 0);
      expand_call (call_expr, NULL_RTX, false);
    }

  emit_barrier ();
}

/* Expand a call to __builtin_unreachable.  We do nothing except emit
   a barrier saying that control flow will not pass here.

   It is the responsibility of the program being compiled to ensure
   that control flow does never reach __builtin_unreachable.  */
static void
expand_builtin_unreachable (void)
{
  emit_barrier ();
}

/* Expand EXP, a call to fabs, fabsf or fabsl.
   Return NULL_RTX if a normal call should be emitted rather than expanding
   the function inline.  If convenient, the result should be placed
   in TARGET.  SUBTARGET may be used as the target for computing
   the operand.  */

static rtx
expand_builtin_fabs (tree exp, rtx target, rtx subtarget)
{
  machine_mode mode;
  tree arg;
  rtx op0;

  if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);
  CALL_EXPR_ARG (exp, 0) = arg = builtin_save_expr (arg);
  mode = TYPE_MODE (TREE_TYPE (arg));
  op0 = expand_expr (arg, subtarget, VOIDmode, EXPAND_NORMAL);
  return expand_abs (mode, op0, target, 0, safe_from_p (target, arg, 1));
}

/* Expand EXP, a call to copysign, copysignf, or copysignl.
   Return NULL is a normal call should be emitted rather than expanding the
   function inline.  If convenient, the result should be placed in TARGET.
   SUBTARGET may be used as the target for computing the operand.  */

static rtx
expand_builtin_copysign (tree exp, rtx target, rtx subtarget)
{
  rtx op0, op1;
  tree arg;

  if (!validate_arglist (exp, REAL_TYPE, REAL_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);
  op0 = expand_expr (arg, subtarget, VOIDmode, EXPAND_NORMAL);

  arg = CALL_EXPR_ARG (exp, 1);
  op1 = expand_normal (arg);

  return expand_copysign (op0, op1, target);
}

/* Emit a call to __builtin___clear_cache.  */

void
default_emit_call_builtin___clear_cache (rtx begin, rtx end)
{
  rtx callee = gen_rtx_SYMBOL_REF (Pmode,
				   BUILTIN_ASM_NAME_PTR
				   (BUILT_IN_CLEAR_CACHE));

  emit_library_call (callee,
		     LCT_NORMAL, VOIDmode,
		     convert_memory_address (ptr_mode, begin), ptr_mode,
		     convert_memory_address (ptr_mode, end), ptr_mode);
}

/* Emit a call to __builtin___clear_cache, unless the target specifies
   it as do-nothing.  This function can be used by trampoline
   finalizers to duplicate the effects of expanding a call to the
   clear_cache builtin.  */

void
maybe_emit_call_builtin___clear_cache (rtx begin, rtx end)
{
  if ((GET_MODE (begin) != ptr_mode && GET_MODE (begin) != Pmode)
      || (GET_MODE (end) != ptr_mode && GET_MODE (end) != Pmode))
    {
      error ("both arguments to %<__builtin___clear_cache%> must be pointers");
      return;
    }

  if (targetm.have_clear_cache ())
    {
      /* We have a "clear_cache" insn, and it will handle everything.  */
      class expand_operand ops[2];

      create_address_operand (&ops[0], begin);
      create_address_operand (&ops[1], end);

      if (maybe_expand_insn (targetm.code_for_clear_cache, 2, ops))
	return;
    }
  else
    {
#ifndef CLEAR_INSN_CACHE
      /* There is no "clear_cache" insn, and __clear_cache() in libgcc
	 does nothing.  There is no need to call it.  Do nothing.  */
      return;
#endif /* CLEAR_INSN_CACHE */
    }

  targetm.calls.emit_call_builtin___clear_cache (begin, end);
}

/* Expand a call to __builtin___clear_cache.  */

static void
expand_builtin___clear_cache (tree exp)
{
  tree begin, end;
  rtx begin_rtx, end_rtx;

  /* We must not expand to a library call.  If we did, any
     fallback library function in libgcc that might contain a call to
     __builtin___clear_cache() would recurse infinitely.  */
  if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
    {
      error ("both arguments to %<__builtin___clear_cache%> must be pointers");
      return;
    }

  begin = CALL_EXPR_ARG (exp, 0);
  begin_rtx = expand_expr (begin, NULL_RTX, Pmode, EXPAND_NORMAL);

  end = CALL_EXPR_ARG (exp, 1);
  end_rtx = expand_expr (end, NULL_RTX, Pmode, EXPAND_NORMAL);

  maybe_emit_call_builtin___clear_cache (begin_rtx, end_rtx);
}

/* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT.  */

static rtx
round_trampoline_addr (rtx tramp)
{
  rtx temp, addend, mask;

  /* If we don't need too much alignment, we'll have been guaranteed
     proper alignment by get_trampoline_type.  */
  if (TRAMPOLINE_ALIGNMENT <= STACK_BOUNDARY)
    return tramp;

  /* Round address up to desired boundary.  */
  temp = gen_reg_rtx (Pmode);
  addend = gen_int_mode (TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT - 1, Pmode);
  mask = gen_int_mode (-TRAMPOLINE_ALIGNMENT / BITS_PER_UNIT, Pmode);

  temp  = expand_simple_binop (Pmode, PLUS, tramp, addend,
			       temp, 0, OPTAB_LIB_WIDEN);
  tramp = expand_simple_binop (Pmode, AND, temp, mask,
			       temp, 0, OPTAB_LIB_WIDEN);

  return tramp;
}

static rtx
expand_builtin_init_trampoline (tree exp, bool onstack)
{
  tree t_tramp, t_func, t_chain;
  rtx m_tramp, r_tramp, r_chain, tmp;

  if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE,
			 POINTER_TYPE, VOID_TYPE))
    return NULL_RTX;

  t_tramp = CALL_EXPR_ARG (exp, 0);
  t_func = CALL_EXPR_ARG (exp, 1);
  t_chain = CALL_EXPR_ARG (exp, 2);

  r_tramp = expand_normal (t_tramp);
  m_tramp = gen_rtx_MEM (BLKmode, r_tramp);
  MEM_NOTRAP_P (m_tramp) = 1;

  /* If ONSTACK, the TRAMP argument should be the address of a field
     within the local function's FRAME decl.  Either way, let's see if
     we can fill in the MEM_ATTRs for this memory.  */
  if (TREE_CODE (t_tramp) == ADDR_EXPR)
    set_mem_attributes (m_tramp, TREE_OPERAND (t_tramp, 0), true);

  /* Creator of a heap trampoline is responsible for making sure the
     address is aligned to at least STACK_BOUNDARY.  Normally malloc
     will ensure this anyhow.  */
  tmp = round_trampoline_addr (r_tramp);
  if (tmp != r_tramp)
    {
      m_tramp = change_address (m_tramp, BLKmode, tmp);
      set_mem_align (m_tramp, TRAMPOLINE_ALIGNMENT);
      set_mem_size (m_tramp, TRAMPOLINE_SIZE);
    }

  /* The FUNC argument should be the address of the nested function.
     Extract the actual function decl to pass to the hook.  */
  gcc_assert (TREE_CODE (t_func) == ADDR_EXPR);
  t_func = TREE_OPERAND (t_func, 0);
  gcc_assert (TREE_CODE (t_func) == FUNCTION_DECL);

  r_chain = expand_normal (t_chain);

  /* Generate insns to initialize the trampoline.  */
  targetm.calls.trampoline_init (m_tramp, t_func, r_chain);

  if (onstack)
    {
      trampolines_created = 1;

      if (targetm.calls.custom_function_descriptors != 0)
	warning_at (DECL_SOURCE_LOCATION (t_func), OPT_Wtrampolines,
		    "trampoline generated for nested function %qD", t_func);
    }

  return const0_rtx;
}

static rtx
expand_builtin_adjust_trampoline (tree exp)
{
  rtx tramp;

  if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tramp = expand_normal (CALL_EXPR_ARG (exp, 0));
  tramp = round_trampoline_addr (tramp);
  if (targetm.calls.trampoline_adjust_address)
    tramp = targetm.calls.trampoline_adjust_address (tramp);

  return tramp;
}

/* Expand a call to the builtin descriptor initialization routine.
   A descriptor is made up of a couple of pointers to the static
   chain and the code entry in this order.  */

static rtx
expand_builtin_init_descriptor (tree exp)
{
  tree t_descr, t_func, t_chain;
  rtx m_descr, r_descr, r_func, r_chain;

  if (!validate_arglist (exp, POINTER_TYPE, POINTER_TYPE, POINTER_TYPE,
			 VOID_TYPE))
    return NULL_RTX;

  t_descr = CALL_EXPR_ARG (exp, 0);
  t_func = CALL_EXPR_ARG (exp, 1);
  t_chain = CALL_EXPR_ARG (exp, 2);

  r_descr = expand_normal (t_descr);
  m_descr = gen_rtx_MEM (BLKmode, r_descr);
  MEM_NOTRAP_P (m_descr) = 1;
  set_mem_align (m_descr, GET_MODE_ALIGNMENT (ptr_mode));

  r_func = expand_normal (t_func);
  r_chain = expand_normal (t_chain);

  /* Generate insns to initialize the descriptor.  */
  emit_move_insn (adjust_address_nv (m_descr, ptr_mode, 0), r_chain);
  emit_move_insn (adjust_address_nv (m_descr, ptr_mode,
				     POINTER_SIZE / BITS_PER_UNIT), r_func);

  return const0_rtx;
}

/* Expand a call to the builtin descriptor adjustment routine.  */

static rtx
expand_builtin_adjust_descriptor (tree exp)
{
  rtx tramp;

  if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
    return NULL_RTX;

  tramp = expand_normal (CALL_EXPR_ARG (exp, 0));

  /* Unalign the descriptor to allow runtime identification.  */
  tramp = plus_constant (ptr_mode, tramp,
			 targetm.calls.custom_function_descriptors);

  return force_operand (tramp, NULL_RTX);
}

/* Expand the call EXP to the built-in signbit, signbitf or signbitl
   function.  The function first checks whether the back end provides
   an insn to implement signbit for the respective mode.  If not, it
   checks whether the floating point format of the value is such that
   the sign bit can be extracted.  If that is not the case, error out.
   EXP is the expression that is a call to the builtin function; if
   convenient, the result should be placed in TARGET.  */
static rtx
expand_builtin_signbit (tree exp, rtx target)
{
  const struct real_format *fmt;
  scalar_float_mode fmode;
  scalar_int_mode rmode, imode;
  tree arg;
  int word, bitpos;
  enum insn_code icode;
  rtx temp;
  location_t loc = EXPR_LOCATION (exp);

  if (!validate_arglist (exp, REAL_TYPE, VOID_TYPE))
    return NULL_RTX;

  arg = CALL_EXPR_ARG (exp, 0);
  fmode = SCALAR_FLOAT_TYPE_MODE (TREE_TYPE (arg));
  rmode = SCALAR_INT_TYPE_MODE (TREE_TYPE (exp));
  fmt = REAL_MODE_FORMAT (fmode);

  arg = builtin_save_expr (arg);

  /* Expand the argument yielding a RTX expression. */
  temp = expand_normal (arg);

  /* Check if the back end provides an insn that handles signbit for the
     argument's mode. */
  icode = optab_handler (signbit_optab, fmode);
  if (icode != CODE_FOR_nothing)
    {
      rtx_insn *last = get_last_insn ();
      target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
      if (maybe_emit_unop_insn (icode, target, temp, UNKNOWN))
	return target;
      delete_insns_since (last);
    }

  /* For floating point formats without a sign bit, implement signbit
     as "ARG < 0.0".  */
  bitpos = fmt->signbit_ro;
  if (bitpos < 0)
  {
    /* But we can't do this if the format supports signed zero.  */
    gcc_assert (!fmt->has_signed_zero || !HONOR_SIGNED_ZEROS (fmode));

    arg = fold_build2_loc (loc, LT_EXPR, TREE_TYPE (exp), arg,
		       build_real (TREE_TYPE (arg), dconst0));
    return expand_expr (arg, target, VOIDmode, EXPAND_NORMAL);
  }

  if (GET_MODE_SIZE (fmode) <= UNITS_PER_WORD)
    {
      imode = int_mode_for_mode (fmode).require ();
      temp = gen_lowpart (imode, temp);
    }
  else
    {
      imode = word_mode;
      /* Handle targets with different FP word orders.  */
      if (FLOAT_WORDS_BIG_ENDIAN)
	word = (GET_MODE_BITSIZE (fmode) - bitpos) / BITS_PER_WORD;
      else
	word = bitpos / BITS_PER_WORD;
      temp = operand_subword_force (temp, word, fmode);
      bitpos = bitpos % BITS_PER_WORD;
    }

  /* Force the intermediate word_mode (or narrower) result into a
     register.  This avoids attempting to create paradoxical SUBREGs
     of floating point modes below.  */
  temp = force_reg (imode, temp);

  /* If the bitpos is within the "result mode" lowpart, the operation
     can be implement with a single bitwise AND.  Otherwise, we need
     a right shift and an AND.  */

  if (bitpos < GET_MODE_BITSIZE (rmode))
    {
      wide_int mask = wi::set_bit_in_zero (bitpos, GET_MODE_PRECISION (rmode));

      if (GET_MODE_SIZE (imode) > GET_MODE_SIZE (rmode))
	temp = gen_lowpart (rmode, temp);
      temp = expand_binop (rmode, and_optab, temp,
			   immed_wide_int_const (mask, rmode),
			   NULL_RTX, 1, OPTAB_LIB_WIDEN);
    }
  else
    {
      /* Perform a logical right shift to place the signbit in the least
	 significant bit, then truncate the result to the desired mode
	 and mask just this bit.  */
      temp = expand_shift (RSHIFT_EXPR, imode, temp, bitpos, NULL_RTX, 1);
      temp = gen_lowpart (rmode, temp);
      temp = expand_binop (rmode, and_optab, temp, const1_rtx,
			   NULL_RTX, 1, OPTAB_LIB_WIDEN);
    }

  return temp;
}

/* Expand fork or exec calls.  TARGET is the desired target of the
   call.  EXP is the call. FN is the
   identificator of the actual function.  IGNORE is nonzero if the
   value is to be ignored.  */

static rtx
expand_builtin_fork_or_exec (tree fn, tree exp, rtx target, int ignore)
{
  tree id, decl;
  tree call;

  if (DECL_FUNCTION_CODE (fn) != BUILT_IN_FORK)
    {
      tree path = CALL_EXPR_ARG (exp, 0);
      /* Detect unterminated path.  */
      if (!check_read_access (exp, path))
	return NULL_RTX;

      /* Also detect unterminated first argument.  */
      switch (DECL_FUNCTION_CODE (fn))
	{
	case BUILT_IN_EXECL:
	case BUILT_IN_EXECLE:
	case BUILT_IN_EXECLP:
	  if (!check_read_access (exp, path))
	    return NULL_RTX;
	default:
	  break;
	}
    }


  /* If we are not profiling, just call the function.  */
  if (!profile_arc_flag)
    return NULL_RTX;

  /* Otherwise call the wrapper.  This should be equivalent for the rest of
     compiler, so the code does not diverge, and the wrapper may run the
     code necessary for keeping the profiling sane.  */

  switch (DECL_FUNCTION_CODE (fn))
    {
    case BUILT_IN_FORK:
      id = get_identifier ("__gcov_fork");
      break;

    case BUILT_IN_EXECL:
      id = get_identifier ("__gcov_execl");
      break;

    case BUILT_IN_EXECV:
      id = get_identifier ("__gcov_execv");
      break;

    case BUILT_IN_EXECLP:
      id = get_identifier ("__gcov_execlp");
      break;

    case BUILT_IN_EXECLE:
      id = get_identifier ("__gcov_execle");
      break;

    case BUILT_IN_EXECVP:
      id = get_identifier ("__gcov_execvp");
      break;

    case BUILT_IN_EXECVE:
      id = get_identifier ("__gcov_execve");
      break;

    default:
      gcc_unreachable ();
    }

  decl = build_decl (DECL_SOURCE_LOCATION (fn),
		     FUNCTION_DECL, id, TREE_TYPE (fn));
  DECL_EXTERNAL (decl) = 1;
  TREE_PUBLIC (decl) = 1;
  DECL_ARTIFICIAL (decl) = 1;
  TREE_NOTHROW (decl) = 1;
  DECL_VISIBILITY (decl) = VISIBILITY_DEFAULT;
  DECL_VISIBILITY_SPECIFIED (decl) = 1;
  call = rewrite_call_expr (EXPR_LOCATION (exp), exp, 0, decl, 0);
  return expand_call (call, target, ignore);
 }



/* Reconstitute a mode for a __sync intrinsic operation.  Since the type of
   the pointer in these functions is void*, the tree optimizers may remove
   casts.  The mode computed in expand_builtin isn't reliable either, due
   to __sync_bool_compare_and_swap.

   FCODE_DIFF should be fcode - base, where base is the FOO_1 code for the
   group of builtins.  This gives us log2 of the mode size.  */

static inline machine_mode
get_builtin_sync_mode (int fcode_diff)
{
  /* The size is not negotiable, so ask not to get BLKmode in return
     if the target indicates that a smaller size would be better.  */
  return int_mode_for_size (BITS_PER_UNIT << fcode_diff, 0).require ();
}

/* Expand the memory expression LOC and return the appropriate memory operand
   for the builtin_sync operations.  */

static rtx
get_builtin_sync_mem (tree loc, machine_mode mode)
{
  rtx addr, mem;
  int addr_space = TYPE_ADDR_SPACE (POINTER_TYPE_P (TREE_TYPE (loc))
				    ? TREE_TYPE (TREE_TYPE (loc))
				    : TREE_TYPE (loc));
  scalar_int_mode addr_mode = targetm.addr_space.address_mode (addr_space);

  addr = expand_expr (loc, NULL_RTX, addr_mode, EXPAND_SUM);
  addr = convert_memory_address (addr_mode, addr);

  /* Note that we explicitly do not want any alias information for this
     memory, so that we kill all other live memories.  Otherwise we don't
     satisfy the full barrier semantics of the intrinsic.  */
  mem = gen_rtx_MEM (mode, addr);

  set_mem_addr_space (mem, addr_space);

  mem = validize_mem (mem);

  /* The alignment needs to be at least according to that of the mode.  */
  set_mem_align (mem, MAX (GET_MODE_ALIGNMENT (mode),
			   get_pointer_alignment (loc)));
  set_mem_alias_set (mem, ALIAS_SET_MEMORY_BARRIER);
  MEM_VOLATILE_P (mem) = 1;

  return mem;
}

/* Make sure an argument is in the right mode.
   EXP is the tree argument. 
   MODE is the mode it should be in.  */

static rtx
expand_expr_force_mode (tree exp, machine_mode mode)
{
  rtx val;
  machine_mode old_mode;

  if (TREE_CODE (exp) == SSA_NAME
      && TYPE_MODE (TREE_TYPE (exp)) != mode)
    {
      /* Undo argument promotion if possible, as combine might not
	 be able to do it later due to MEM_VOLATILE_P uses in the
	 patterns.  */
      gimple *g = get_gimple_for_ssa_name (exp);
      if (g && gimple_assign_cast_p (g))
	{
	  tree rhs = gimple_assign_rhs1 (g);
	  tree_code code = gimple_assign_rhs_code (g);
	  if (CONVERT_EXPR_CODE_P (code)
	      && TYPE_MODE (TREE_TYPE (rhs)) == mode
	      && INTEGRAL_TYPE_P (TREE_TYPE (exp))
	      && INTEGRAL_TYPE_P (TREE_TYPE (rhs))
	      && (TYPE_PRECISION (TREE_TYPE (exp))
		  > TYPE_PRECISION (TREE_TYPE (rhs))))
	    exp = rhs;
	}
    }

  val = expand_expr (exp, NULL_RTX, mode, EXPAND_NORMAL);
  /* If VAL is promoted to a wider mode, convert it back to MODE.  Take care
     of CONST_INTs, where we know the old_mode only from the call argument.  */

  old_mode = GET_MODE (val);
  if (old_mode == VOIDmode)
    old_mode = TYPE_MODE (TREE_TYPE (exp));
  val = convert_modes (mode, old_mode, val, 1);
  return val;
}


/* Expand the __sync_xxx_and_fetch and __sync_fetch_and_xxx intrinsics.
   EXP is the CALL_EXPR.  CODE is the rtx code
   that corresponds to the arithmetic or logical operation from the name;
   an exception here is that NOT actually means NAND.  TARGET is an optional
   place for us to store the results; AFTER is true if this is the
   fetch_and_xxx form.  */

static rtx
expand_builtin_sync_operation (machine_mode mode, tree exp,
			       enum rtx_code code, bool after,
			       rtx target)
{
  rtx val, mem;
  location_t loc = EXPR_LOCATION (exp);

  if (code == NOT && warn_sync_nand)
    {
      tree fndecl = get_callee_fndecl (exp);
      enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);

      static bool warned_f_a_n, warned_n_a_f;

      switch (fcode)
	{
	case BUILT_IN_SYNC_FETCH_AND_NAND_1:
	case BUILT_IN_SYNC_FETCH_AND_NAND_2:
	case BUILT_IN_SYNC_FETCH_AND_NAND_4:
	case BUILT_IN_SYNC_FETCH_AND_NAND_8:
	case BUILT_IN_SYNC_FETCH_AND_NAND_16:
	  if (warned_f_a_n)
	    break;

	  fndecl = builtin_decl_implicit (BUILT_IN_SYNC_FETCH_AND_NAND_N);
	  inform (loc, "%qD changed semantics in GCC 4.4", fndecl);
	  warned_f_a_n = true;
	  break;

	case BUILT_IN_SYNC_NAND_AND_FETCH_1:
	case BUILT_IN_SYNC_NAND_AND_FETCH_2:
	case BUILT_IN_SYNC_NAND_AND_FETCH_4:
	case BUILT_IN_SYNC_NAND_AND_FETCH_8:
	case BUILT_IN_SYNC_NAND_AND_FETCH_16:
	  if (warned_n_a_f)
	    break;

	 fndecl = builtin_decl_implicit (BUILT_IN_SYNC_NAND_AND_FETCH_N);
	  inform (loc, "%qD changed semantics in GCC 4.4", fndecl);
	  warned_n_a_f = true;
	  break;

	default:
	  gcc_unreachable ();
	}
    }

  /* Expand the operands.  */
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
  val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);

  return expand_atomic_fetch_op (target, mem, val, code, MEMMODEL_SYNC_SEQ_CST,
				 after);
}

/* Expand the __sync_val_compare_and_swap and __sync_bool_compare_and_swap
   intrinsics. EXP is the CALL_EXPR.  IS_BOOL is
   true if this is the boolean form.  TARGET is a place for us to store the
   results; this is NOT optional if IS_BOOL is true.  */

static rtx
expand_builtin_compare_and_swap (machine_mode mode, tree exp,
				 bool is_bool, rtx target)
{
  rtx old_val, new_val, mem;
  rtx *pbool, *poval;

  /* Expand the operands.  */
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
  old_val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);
  new_val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 2), mode);

  pbool = poval = NULL;
  if (target != const0_rtx)
    {
      if (is_bool)
	pbool = &target;
      else
	poval = &target;
    }
  if (!expand_atomic_compare_and_swap (pbool, poval, mem, old_val, new_val,
				       false, MEMMODEL_SYNC_SEQ_CST,
				       MEMMODEL_SYNC_SEQ_CST))
    return NULL_RTX;

  return target;
}

/* Expand the __sync_lock_test_and_set intrinsic.  Note that the most
   general form is actually an atomic exchange, and some targets only
   support a reduced form with the second argument being a constant 1.
   EXP is the CALL_EXPR; TARGET is an optional place for us to store
   the results.  */

static rtx
expand_builtin_sync_lock_test_and_set (machine_mode mode, tree exp,
				       rtx target)
{
  rtx val, mem;

  /* Expand the operands.  */
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
  val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);

  return expand_sync_lock_test_and_set (target, mem, val);
}

/* Expand the __sync_lock_release intrinsic.  EXP is the CALL_EXPR.  */

static void
expand_builtin_sync_lock_release (machine_mode mode, tree exp)
{
  rtx mem;

  /* Expand the operands.  */
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);

  expand_atomic_store (mem, const0_rtx, MEMMODEL_SYNC_RELEASE, true);
}

/* Given an integer representing an ``enum memmodel'', verify its
   correctness and return the memory model enum.  */

static enum memmodel
get_memmodel (tree exp)
{
  rtx op;
  unsigned HOST_WIDE_INT val;
  location_t loc
    = expansion_point_location_if_in_system_header (input_location);

  /* If the parameter is not a constant, it's a run time value so we'll just
     convert it to MEMMODEL_SEQ_CST to avoid annoying runtime checking.  */
  if (TREE_CODE (exp) != INTEGER_CST)
    return MEMMODEL_SEQ_CST;

  op = expand_normal (exp);

  val = INTVAL (op);
  if (targetm.memmodel_check)
    val = targetm.memmodel_check (val);
  else if (val & ~MEMMODEL_MASK)
    {
      warning_at (loc, OPT_Winvalid_memory_model,
		  "unknown architecture specifier in memory model to builtin");
      return MEMMODEL_SEQ_CST;
    }

  /* Should never see a user explicit SYNC memodel model, so >= LAST works. */
  if (memmodel_base (val) >= MEMMODEL_LAST)
    {
      warning_at (loc, OPT_Winvalid_memory_model,
		  "invalid memory model argument to builtin");
      return MEMMODEL_SEQ_CST;
    }

  /* Workaround for Bugzilla 59448. GCC doesn't track consume properly, so
     be conservative and promote consume to acquire.  */
  if (val == MEMMODEL_CONSUME)
    val = MEMMODEL_ACQUIRE;

  return (enum memmodel) val;
}

/* Expand the __atomic_exchange intrinsic:
   	TYPE __atomic_exchange (TYPE *object, TYPE desired, enum memmodel)
   EXP is the CALL_EXPR.
   TARGET is an optional place for us to store the results.  */

static rtx
expand_builtin_atomic_exchange (machine_mode mode, tree exp, rtx target)
{
  rtx val, mem;
  enum memmodel model;

  model = get_memmodel (CALL_EXPR_ARG (exp, 2));

  if (!flag_inline_atomics)
    return NULL_RTX;

  /* Expand the operands.  */
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
  val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);

  return expand_atomic_exchange (target, mem, val, model);
}

/* Expand the __atomic_compare_exchange intrinsic:
   	bool __atomic_compare_exchange (TYPE *object, TYPE *expect, 
					TYPE desired, BOOL weak, 
					enum memmodel success,
					enum memmodel failure)
   EXP is the CALL_EXPR.
   TARGET is an optional place for us to store the results.  */

static rtx
expand_builtin_atomic_compare_exchange (machine_mode mode, tree exp, 
					rtx target)
{
  rtx expect, desired, mem, oldval;
  rtx_code_label *label;
  enum memmodel success, failure;
  tree weak;
  bool is_weak;
  location_t loc
    = expansion_point_location_if_in_system_header (input_location);

  success = get_memmodel (CALL_EXPR_ARG (exp, 4));
  failure = get_memmodel (CALL_EXPR_ARG (exp, 5));

  if (failure > success)
    {
      warning_at (loc, OPT_Winvalid_memory_model,
		  "failure memory model cannot be stronger than success "
		  "memory model for %<__atomic_compare_exchange%>");
      success = MEMMODEL_SEQ_CST;
    }
 
  if (is_mm_release (failure) || is_mm_acq_rel (failure))
    {
      warning_at (loc, OPT_Winvalid_memory_model,
		  "invalid failure memory model for "
		  "%<__atomic_compare_exchange%>");
      failure = MEMMODEL_SEQ_CST;
      success = MEMMODEL_SEQ_CST;
    }

 
  if (!flag_inline_atomics)
    return NULL_RTX;

  /* Expand the operands.  */
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);

  expect = expand_normal (CALL_EXPR_ARG (exp, 1));
  expect = convert_memory_address (Pmode, expect);
  expect = gen_rtx_MEM (mode, expect);
  desired = expand_expr_force_mode (CALL_EXPR_ARG (exp, 2), mode);

  weak = CALL_EXPR_ARG (exp, 3);
  is_weak = false;
  if (tree_fits_shwi_p (weak) && tree_to_shwi (weak) != 0)
    is_weak = true;

  if (target == const0_rtx)
    target = NULL;

  /* Lest the rtl backend create a race condition with an imporoper store
     to memory, always create a new pseudo for OLDVAL.  */
  oldval = NULL;

  if (!expand_atomic_compare_and_swap (&target, &oldval, mem, expect, desired,
				       is_weak, success, failure))
    return NULL_RTX;

  /* Conditionally store back to EXPECT, lest we create a race condition
     with an improper store to memory.  */
  /* ??? With a rearrangement of atomics at the gimple level, we can handle
     the normal case where EXPECT is totally private, i.e. a register.  At
     which point the store can be unconditional.  */
  label = gen_label_rtx ();
  emit_cmp_and_jump_insns (target, const0_rtx, NE, NULL,
			   GET_MODE (target), 1, label);
  emit_move_insn (expect, oldval);
  emit_label (label);

  return target;
}

/* Helper function for expand_ifn_atomic_compare_exchange - expand
   internal ATOMIC_COMPARE_EXCHANGE call into __atomic_compare_exchange_N
   call.  The weak parameter must be dropped to match the expected parameter
   list and the expected argument changed from value to pointer to memory
   slot.  */

static void
expand_ifn_atomic_compare_exchange_into_call (gcall *call, machine_mode mode)
{
  unsigned int z;
  vec<tree, va_gc> *vec;

  vec_alloc (vec, 5);
  vec->quick_push (gimple_call_arg (call, 0));
  tree expected = gimple_call_arg (call, 1);
  rtx x = assign_stack_temp_for_type (mode, GET_MODE_SIZE (mode),
				      TREE_TYPE (expected));
  rtx expd = expand_expr (expected, x, mode, EXPAND_NORMAL);
  if (expd != x)
    emit_move_insn (x, expd);
  tree v = make_tree (TREE_TYPE (expected), x);
  vec->quick_push (build1 (ADDR_EXPR,
			   build_pointer_type (TREE_TYPE (expected)), v));
  vec->quick_push (gimple_call_arg (call, 2));
  /* Skip the boolean weak parameter.  */
  for (z = 4; z < 6; z++)
    vec->quick_push (gimple_call_arg (call, z));
  /* At present we only have BUILT_IN_ATOMIC_COMPARE_EXCHANGE_{1,2,4,8,16}.  */
  unsigned int bytes_log2 = exact_log2 (GET_MODE_SIZE (mode).to_constant ());
  gcc_assert (bytes_log2 < 5);
  built_in_function fncode
    = (built_in_function) ((int) BUILT_IN_ATOMIC_COMPARE_EXCHANGE_1
			   + bytes_log2);
  tree fndecl = builtin_decl_explicit (fncode);
  tree fn = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fndecl)),
		    fndecl);
  tree exp = build_call_vec (boolean_type_node, fn, vec);
  tree lhs = gimple_call_lhs (call);
  rtx boolret = expand_call (exp, NULL_RTX, lhs == NULL_TREE);
  if (lhs)
    {
      rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
      if (GET_MODE (boolret) != mode)
	boolret = convert_modes (mode, GET_MODE (boolret), boolret, 1);
      x = force_reg (mode, x);
      write_complex_part (target, boolret, true);
      write_complex_part (target, x, false);
    }
}

/* Expand IFN_ATOMIC_COMPARE_EXCHANGE internal function.  */

void
expand_ifn_atomic_compare_exchange (gcall *call)
{
  int size = tree_to_shwi (gimple_call_arg (call, 3)) & 255;
  gcc_assert (size == 1 || size == 2 || size == 4 || size == 8 || size == 16);
  machine_mode mode = int_mode_for_size (BITS_PER_UNIT * size, 0).require ();
  rtx expect, desired, mem, oldval, boolret;
  enum memmodel success, failure;
  tree lhs;
  bool is_weak;
  location_t loc
    = expansion_point_location_if_in_system_header (gimple_location (call));

  success = get_memmodel (gimple_call_arg (call, 4));
  failure = get_memmodel (gimple_call_arg (call, 5));

  if (failure > success)
    {
      warning_at (loc, OPT_Winvalid_memory_model,
		  "failure memory model cannot be stronger than success "
		  "memory model for %<__atomic_compare_exchange%>");
      success = MEMMODEL_SEQ_CST;
    }

  if (is_mm_release (failure) || is_mm_acq_rel (failure))
    {
      warning_at (loc, OPT_Winvalid_memory_model,
		  "invalid failure memory model for "
		  "%<__atomic_compare_exchange%>");
      failure = MEMMODEL_SEQ_CST;
      success = MEMMODEL_SEQ_CST;
    }

  if (!flag_inline_atomics)
    {
      expand_ifn_atomic_compare_exchange_into_call (call, mode);
      return;
    }

  /* Expand the operands.  */
  mem = get_builtin_sync_mem (gimple_call_arg (call, 0), mode);

  expect = expand_expr_force_mode (gimple_call_arg (call, 1), mode);
  desired = expand_expr_force_mode (gimple_call_arg (call, 2), mode);

  is_weak = (tree_to_shwi (gimple_call_arg (call, 3)) & 256) != 0;

  boolret = NULL;
  oldval = NULL;

  if (!expand_atomic_compare_and_swap (&boolret, &oldval, mem, expect, desired,
				       is_weak, success, failure))
    {
      expand_ifn_atomic_compare_exchange_into_call (call, mode);
      return;
    }

  lhs = gimple_call_lhs (call);
  if (lhs)
    {
      rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
      if (GET_MODE (boolret) != mode)
	boolret = convert_modes (mode, GET_MODE (boolret), boolret, 1);
      write_complex_part (target, boolret, true);
      write_complex_part (target, oldval, false);
    }
}

/* Expand the __atomic_load intrinsic:
   	TYPE __atomic_load (TYPE *object, enum memmodel)
   EXP is the CALL_EXPR.
   TARGET is an optional place for us to store the results.  */

static rtx
expand_builtin_atomic_load (machine_mode mode, tree exp, rtx target)
{
  rtx mem;
  enum memmodel model;

  model = get_memmodel (CALL_EXPR_ARG (exp, 1));
  if (is_mm_release (model) || is_mm_acq_rel (model))
    {
      location_t loc
	= expansion_point_location_if_in_system_header (input_location);
      warning_at (loc, OPT_Winvalid_memory_model,
		  "invalid memory model for %<__atomic_load%>");
      model = MEMMODEL_SEQ_CST;
    }

  if (!flag_inline_atomics)
    return NULL_RTX;

  /* Expand the operand.  */
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);

  return expand_atomic_load (target, mem, model);
}


/* Expand the __atomic_store intrinsic:
   	void __atomic_store (TYPE *object, TYPE desired, enum memmodel)
   EXP is the CALL_EXPR.
   TARGET is an optional place for us to store the results.  */

static rtx
expand_builtin_atomic_store (machine_mode mode, tree exp)
{
  rtx mem, val;
  enum memmodel model;

  model = get_memmodel (CALL_EXPR_ARG (exp, 2));
  if (!(is_mm_relaxed (model) || is_mm_seq_cst (model)
	|| is_mm_release (model)))
    {
      location_t loc
	= expansion_point_location_if_in_system_header (input_location);
      warning_at (loc, OPT_Winvalid_memory_model,
		  "invalid memory model for %<__atomic_store%>");
      model = MEMMODEL_SEQ_CST;
    }

  if (!flag_inline_atomics)
    return NULL_RTX;

  /* Expand the operands.  */
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
  val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);

  return expand_atomic_store (mem, val, model, false);
}

/* Expand the __atomic_fetch_XXX intrinsic:
   	TYPE __atomic_fetch_XXX (TYPE *object, TYPE val, enum memmodel)
   EXP is the CALL_EXPR.
   TARGET is an optional place for us to store the results.
   CODE is the operation, PLUS, MINUS, ADD, XOR, or IOR.
   FETCH_AFTER is true if returning the result of the operation.
   FETCH_AFTER is false if returning the value before the operation.
   IGNORE is true if the result is not used.
   EXT_CALL is the correct builtin for an external call if this cannot be
   resolved to an instruction sequence.  */

static rtx
expand_builtin_atomic_fetch_op (machine_mode mode, tree exp, rtx target,
				enum rtx_code code, bool fetch_after,
				bool ignore, enum built_in_function ext_call)
{
  rtx val, mem, ret;
  enum memmodel model;
  tree fndecl;
  tree addr;

  model = get_memmodel (CALL_EXPR_ARG (exp, 2));

  /* Expand the operands.  */
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
  val = expand_expr_force_mode (CALL_EXPR_ARG (exp, 1), mode);

  /* Only try generating instructions if inlining is turned on.  */
  if (flag_inline_atomics)
    {
      ret = expand_atomic_fetch_op (target, mem, val, code, model, fetch_after);
      if (ret)
	return ret;
    }

  /* Return if a different routine isn't needed for the library call.  */
  if (ext_call == BUILT_IN_NONE)
    return NULL_RTX;

  /* Change the call to the specified function.  */
  fndecl = get_callee_fndecl (exp);
  addr = CALL_EXPR_FN (exp);
  STRIP_NOPS (addr);

  gcc_assert (TREE_OPERAND (addr, 0) == fndecl);
  TREE_OPERAND (addr, 0) = builtin_decl_explicit (ext_call);

  /* If we will emit code after the call, the call cannot be a tail call.
     If it is emitted as a tail call, a barrier is emitted after it, and
     then all trailing code is removed.  */
  if (!ignore)
    CALL_EXPR_TAILCALL (exp) = 0;

  /* Expand the call here so we can emit trailing code.  */
  ret = expand_call (exp, target, ignore);

  /* Replace the original function just in case it matters.  */
  TREE_OPERAND (addr, 0) = fndecl;

  /* Then issue the arithmetic correction to return the right result.  */
  if (!ignore)
    {
      if (code == NOT)
	{
	  ret = expand_simple_binop (mode, AND, ret, val, NULL_RTX, true,
				     OPTAB_LIB_WIDEN);
	  ret = expand_simple_unop (mode, NOT, ret, target, true);
	}
      else
	ret = expand_simple_binop (mode, code, ret, val, target, true,
				   OPTAB_LIB_WIDEN);
    }
  return ret;
}

/* Expand IFN_ATOMIC_BIT_TEST_AND_* internal function.  */

void
expand_ifn_atomic_bit_test_and (gcall *call)
{
  tree ptr = gimple_call_arg (call, 0);
  tree bit = gimple_call_arg (call, 1);
  tree flag = gimple_call_arg (call, 2);
  tree lhs = gimple_call_lhs (call);
  enum memmodel model = MEMMODEL_SYNC_SEQ_CST;
  machine_mode mode = TYPE_MODE (TREE_TYPE (flag));
  enum rtx_code code;
  optab optab;
  class expand_operand ops[5];

  gcc_assert (flag_inline_atomics);

  if (gimple_call_num_args (call) == 4)
    model = get_memmodel (gimple_call_arg (call, 3));

  rtx mem = get_builtin_sync_mem (ptr, mode);
  rtx val = expand_expr_force_mode (bit, mode);

  switch (gimple_call_internal_fn (call))
    {
    case IFN_ATOMIC_BIT_TEST_AND_SET:
      code = IOR;
      optab = atomic_bit_test_and_set_optab;
      break;
    case IFN_ATOMIC_BIT_TEST_AND_COMPLEMENT:
      code = XOR;
      optab = atomic_bit_test_and_complement_optab;
      break;
    case IFN_ATOMIC_BIT_TEST_AND_RESET:
      code = AND;
      optab = atomic_bit_test_and_reset_optab;
      break;
    default:
      gcc_unreachable ();
    }

  if (lhs == NULL_TREE)
    {
      val = expand_simple_binop (mode, ASHIFT, const1_rtx,
				 val, NULL_RTX, true, OPTAB_DIRECT);
      if (code == AND)
	val = expand_simple_unop (mode, NOT, val, NULL_RTX, true);
      expand_atomic_fetch_op (const0_rtx, mem, val, code, model, false);
      return;
    }

  rtx target = expand_expr (lhs, NULL_RTX, VOIDmode, EXPAND_WRITE);
  enum insn_code icode = direct_optab_handler (optab, mode);
  gcc_assert (icode != CODE_FOR_nothing);
  create_output_operand (&ops[0], target, mode);
  create_fixed_operand (&ops[1], mem);
  create_convert_operand_to (&ops[2], val, mode, true);
  create_integer_operand (&ops[3], model);
  create_integer_operand (&ops[4], integer_onep (flag));
  if (maybe_expand_insn (icode, 5, ops))
    return;

  rtx bitval = val;
  val = expand_simple_binop (mode, ASHIFT, const1_rtx,
			     val, NULL_RTX, true, OPTAB_DIRECT);
  rtx maskval = val;
  if (code == AND)
    val = expand_simple_unop (mode, NOT, val, NULL_RTX, true);
  rtx result = expand_atomic_fetch_op (gen_reg_rtx (mode), mem, val,
				       code, model, false);
  if (integer_onep (flag))
    {
      result = expand_simple_binop (mode, ASHIFTRT, result, bitval,
				    NULL_RTX, true, OPTAB_DIRECT);
      result = expand_simple_binop (mode, AND, result, const1_rtx, target,
				    true, OPTAB_DIRECT);
    }
  else
    result = expand_simple_binop (mode, AND, result, maskval, target, true,
				  OPTAB_DIRECT);
  if (result != target)
    emit_move_insn (target, result);
}

/* Expand an atomic clear operation.
	void _atomic_clear (BOOL *obj, enum memmodel)
   EXP is the call expression.  */

static rtx
expand_builtin_atomic_clear (tree exp) 
{
  machine_mode mode;
  rtx mem, ret;
  enum memmodel model;

  mode = int_mode_for_size (BOOL_TYPE_SIZE, 0).require ();
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
  model = get_memmodel (CALL_EXPR_ARG (exp, 1));

  if (is_mm_consume (model) || is_mm_acquire (model) || is_mm_acq_rel (model))
    {
      location_t loc
	= expansion_point_location_if_in_system_header (input_location);
      warning_at (loc, OPT_Winvalid_memory_model,
		  "invalid memory model for %<__atomic_store%>");
      model = MEMMODEL_SEQ_CST;
    }

  /* Try issuing an __atomic_store, and allow fallback to __sync_lock_release.
     Failing that, a store is issued by __atomic_store.  The only way this can
     fail is if the bool type is larger than a word size.  Unlikely, but
     handle it anyway for completeness.  Assume a single threaded model since
     there is no atomic support in this case, and no barriers are required.  */
  ret = expand_atomic_store (mem, const0_rtx, model, true);
  if (!ret)
    emit_move_insn (mem, const0_rtx);
  return const0_rtx;
}

/* Expand an atomic test_and_set operation.
	bool _atomic_test_and_set (BOOL *obj, enum memmodel)
   EXP is the call expression.  */

static rtx
expand_builtin_atomic_test_and_set (tree exp, rtx target)
{
  rtx mem;
  enum memmodel model;
  machine_mode mode;

  mode = int_mode_for_size (BOOL_TYPE_SIZE, 0).require ();
  mem = get_builtin_sync_mem (CALL_EXPR_ARG (exp, 0), mode);
  model = get_memmodel (CALL_EXPR_ARG (exp, 1));

  return expand_atomic_test_and_set (target, mem, model);
}


/* Return true if (optional) argument ARG1 of size ARG0 is always lock free on
   this architecture.  If ARG1 is NULL, use typical alignment for size ARG0.  */

static tree
fold_builtin_atomic_always_lock_free (tree arg0, tree arg1)
{
  int size;
  machine_mode mode;
  unsigned int mode_align, type_align;

  if (TREE_CODE (arg0) != INTEGER_CST)
    return NULL_TREE;

  /* We need a corresponding integer mode for the access to be lock-free.  */
  size = INTVAL (expand_normal (arg0)) * BITS_PER_UNIT;
  if (!int_mode_for_size (size, 0).exists (&mode))
    return boolean_false_node;

  mode_align = GET_MODE_ALIGNMENT (mode);

  if (TREE_CODE (arg1) == INTEGER_CST)
    {
      unsigned HOST_WIDE_INT val = UINTVAL (expand_normal (arg1));

      /* Either this argument is null, or it's a fake pointer encoding
         the alignment of the object.  */
      val = least_bit_hwi (val);
      val *= BITS_PER_UNIT;

      if (val == 0 || mode_align < val)
        type_align = mode_align;
      else
        type_align = val;
    }
  else
    {
      tree ttype = TREE_TYPE (arg1);

      /* This function is usually invoked and folded immediately by the front
	 end before anything else has a chance to look at it.  The pointer
	 parameter at this point is usually cast to a void *, so check for that
	 and look past the cast.  */
      if (CONVERT_EXPR_P (arg1)
	  && POINTER_TYPE_P (ttype)
	  && VOID_TYPE_P (TREE_TYPE (ttype))
	  && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (arg1, 0))))
	arg1 = TREE_OPERAND (arg1, 0);

      ttype = TREE_TYPE (arg1);
      gcc_assert (POINTER_TYPE_P (ttype));

      /* Get the underlying type of the object.  */
      ttype = TREE_TYPE (ttype);
      type_align = TYPE_ALIGN (ttype);
    }

  /* If the object has smaller alignment, the lock free routines cannot
     be used.  */
  if (type_align < mode_align)
    return boolean_false_node;

  /* Check if a compare_and_swap pattern exists for the mode which represents
     the required size.  The pattern is not allowed to fail, so the existence
     of the pattern indicates support is present.  Also require that an
     atomic load exists for the required size.  */
  if (can_compare_and_swap_p (mode, true) && can_atomic_load_p (mode))
    return boolean_true_node;
  else
    return boolean_false_node;
}

/* Return true if the parameters to call EXP represent an object which will
   always generate lock free instructions.  The first argument represents the
   size of the object, and the second parameter is a pointer to the object 
   itself.  If NULL is passed for the object, then the result is based on 
   typical alignment for an object of the specified size.  Otherwise return 
   false.  */

static rtx
expand_builtin_atomic_always_lock_free (tree exp)
{
  tree size;
  tree arg0 = CALL_EXPR_ARG (exp, 0);
  tree arg1 = CALL_EXPR_ARG (exp, 1);

  if (TREE_CODE (arg0) != INTEGER_CST)
    {
      error ("non-constant argument 1 to %qs", "__atomic_always_lock_free");
      return const0_rtx;
    }

  size = fold_builtin_atomic_always_lock_free (arg0, arg1);
  if (size == boolean_true_node)
    return const1_rtx;
  return const0_rtx;
}

/* Return a one or zero if it can be determined that object ARG1 of size ARG 
   is lock free on this architecture.  */

static tree
fold_builtin_atomic_is_lock_free (tree arg0, tree arg1)
{
  if (!flag_inline_atomics)
    return NULL_TREE;
  
  /* If it isn't always lock free, don't generate a result.  */
  if (fold_builtin_atomic_always_lock_free (arg0, arg1) == boolean_true_node)
    return boolean_true_node;

  return NULL_TREE;
}

/* Return true if the parameters to call EXP represent an object which will
   always generate lock free instructions.  The first argument represents the
   size of the object, and the second parameter is a pointer to the object 
   itself.  If NULL is passed for the object, then the result is based on 
   typical alignment for an object of the specified size.  Otherwise return 
   NULL*/

static rtx
expand_builtin_atomic_is_lock_free (tree exp)
{
  tree size;
  tree arg0 = CALL_EXPR_ARG (exp, 0);
  tree arg1 = CALL_EXPR_ARG (exp, 1);

  if (!INTEGRAL_TYPE_P (TREE_TYPE (arg0)))
    {
      error ("non-integer argument 1 to %qs", "__atomic_is_lock_free");
      return NULL_RTX;
    }

  if (!flag_inline_atomics)
    return NULL_RTX; 

  /* If the value is known at compile time, return the RTX for it.  */
  size = fold_builtin_atomic_is_lock_free (arg0, arg1);
  if (size == boolean_true_node)
    return const1_rtx;

  return NULL_RTX;
}

/* Expand the __atomic_thread_fence intrinsic:
   	void __atomic_thread_fence (enum memmodel)
   EXP is the CALL_EXPR.  */

static void
expand_builtin_atomic_thread_fence (tree exp)
{
  enum memmodel model = get_memmodel (CALL_EXPR_ARG (exp, 0));
  expand_mem_thread_fence (model);
}

/* Expand the __atomic_signal_fence intrinsic:
   	void __atomic_signal_fence (enum memmodel)
   EXP is the CALL_EXPR.  */

static void
expand_builtin_atomic_signal_fence (tree exp)
{
  enum memmodel model = get_memmodel (CALL_EXPR_ARG (exp, 0));
  expand_mem_signal_fence (model);
}

/* Expand the __sync_synchronize intrinsic.  */

static void
expand_builtin_sync_synchronize (void)
{
  expand_mem_thread_fence (MEMMODEL_SYNC_SEQ_CST);
}

static rtx
expand_builtin_thread_pointer (tree exp, rtx target)
{
  enum insn_code icode;
  if (!validate_arglist (exp, VOID_TYPE))
    return const0_rtx;
  icode = direct_optab_handler (get_thread_pointer_optab, Pmode);
  if (icode != CODE_FOR_nothing)
    {
      class expand_operand op;
      /* If the target is not sutitable then create a new target. */
      if (target == NULL_RTX
	  || !REG_P (target)
	  || GET_MODE (target) != Pmode)
	target = gen_reg_rtx (Pmode);
      create_output_operand (&op, target, Pmode);
      expand_insn (icode, 1, &op);
      return target;
    }
  error ("%<__builtin_thread_pointer%> is not supported on this target");
  return const0_rtx;
}

static void
expand_builtin_set_thread_pointer (tree exp)
{
  enum insn_code icode;
  if (!validate_arglist (exp, POINTER_TYPE, VOID_TYPE))
    return;
  icode = direct_optab_handler (set_thread_pointer_optab, Pmode);
  if (icode != CODE_FOR_nothing)
    {
      class expand_operand op;
      rtx val = expand_expr (CALL_EXPR_ARG (exp, 0), NULL_RTX,
			     Pmode, EXPAND_NORMAL);      
      create_input_operand (&op, val, Pmode);
      expand_insn (icode, 1, &op);
      return;
    }
  error ("%<__builtin_set_thread_pointer%> is not supported on this target");
}


/* Emit code to restore the current value of stack.  */

static void
expand_stack_restore (tree var)
{
  rtx_insn *prev;
  rtx sa = expand_normal (var);

  sa = convert_memory_address (Pmode, sa);

  prev = get_last_insn ();
  emit_stack_restore (SAVE_BLOCK, sa);

  record_new_stack_level ();

  fixup_args_size_notes (prev, get_last_insn (), 0);
}

/* Emit code to save the current value of stack.  */

static rtx
expand_stack_save (void)
{
  rtx ret = NULL_RTX;

  emit_stack_save (SAVE_BLOCK, &ret);
  return ret;
}

/* Emit code to get the openacc gang, worker or vector id or size.  */

static rtx
expand_builtin_goacc_parlevel_id_size (tree exp, rtx target, int ignore)
{
  const char *name;
  rtx fallback_retval;
  rtx_insn *(*gen_fn) (rtx, rtx);
  switch (DECL_FUNCTION_CODE (get_callee_fndecl (exp)))
    {
    case BUILT_IN_GOACC_PARLEVEL_ID:
      name = "__builtin_goacc_parlevel_id";
      fallback_retval = const0_rtx;
      gen_fn = targetm.gen_oacc_dim_pos;
      break;
    case BUILT_IN_GOACC_PARLEVEL_SIZE:
      name = "__builtin_goacc_parlevel_size";
      fallback_retval = const1_rtx;
      gen_fn = targetm.gen_oacc_dim_size;
      break;
    default:
      gcc_unreachable ();
    }

  if (oacc_get_fn_attrib (current_function_decl) == NULL_TREE)
    {
      error ("%qs only supported in OpenACC code", name);
      return const0_rtx;
    }

  tree arg = CALL_EXPR_ARG (exp, 0);
  if (TREE_CODE (arg) != INTEGER_CST)
    {
      error ("non-constant argument 0 to %qs", name);
      return const0_rtx;
    }

  int dim = TREE_INT_CST_LOW (arg);
  switch (dim)
    {
    case GOMP_DIM_GANG:
    case GOMP_DIM_WORKER:
    case GOMP_DIM_VECTOR:
      break;
    default:
      error ("illegal argument 0 to %qs", name);
      return const0_rtx;
    }

  if (ignore)
    return target;

  if (target == NULL_RTX)
    target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));

  if (!targetm.have_oacc_dim_size ())
    {
      emit_move_insn (target, fallback_retval);
      return target;
    }

  rtx reg = MEM_P (target) ? gen_reg_rtx (GET_MODE (target)) : target;
  emit_insn (gen_fn (reg, GEN_INT (dim)));
  if (reg != target)
    emit_move_insn (target, reg);

  return target;
}

/* Expand a string compare operation using a sequence of char comparison
   to get rid of the calling overhead, with result going to TARGET if
   that's convenient.

   VAR_STR is the variable string source;
   CONST_STR is the constant string source;
   LENGTH is the number of chars to compare;
   CONST_STR_N indicates which source string is the constant string;
   IS_MEMCMP indicates whether it's a memcmp or strcmp.
  
   to: (assume const_str_n is 2, i.e., arg2 is a constant string)

   target = (int) (unsigned char) var_str[0]
	    - (int) (unsigned char) const_str[0];
   if (target != 0)
     goto ne_label;
     ...
   target = (int) (unsigned char) var_str[length - 2]
	    - (int) (unsigned char) const_str[length - 2];
   if (target != 0)
     goto ne_label;
   target = (int) (unsigned char) var_str[length - 1]
	    - (int) (unsigned char) const_str[length - 1];
   ne_label:
  */

static rtx
inline_string_cmp (rtx target, tree var_str, const char *const_str,
		   unsigned HOST_WIDE_INT length,
		   int const_str_n, machine_mode mode)
{
  HOST_WIDE_INT offset = 0;
  rtx var_rtx_array
    = get_memory_rtx (var_str, build_int_cst (unsigned_type_node,length));
  rtx var_rtx = NULL_RTX;
  rtx const_rtx = NULL_RTX;
  rtx result = target ? target : gen_reg_rtx (mode);
  rtx_code_label *ne_label = gen_label_rtx ();
  tree unit_type_node = unsigned_char_type_node;
  scalar_int_mode unit_mode
    = as_a <scalar_int_mode> TYPE_MODE (unit_type_node);

  start_sequence ();

  for (unsigned HOST_WIDE_INT i = 0; i < length; i++)
    {
      var_rtx
	= adjust_address (var_rtx_array, TYPE_MODE (unit_type_node), offset);
      const_rtx = c_readstr (const_str + offset, unit_mode);
      rtx op0 = (const_str_n == 1) ? const_rtx : var_rtx;
      rtx op1 = (const_str_n == 1) ? var_rtx : const_rtx;

      op0 = convert_modes (mode, unit_mode, op0, 1);
      op1 = convert_modes (mode, unit_mode, op1, 1);
      result = expand_simple_binop (mode, MINUS, op0, op1,
				    result, 1, OPTAB_WIDEN);
      if (i < length - 1)
	emit_cmp_and_jump_insns (result, CONST0_RTX (mode), NE, NULL_RTX,
	    			 mode, true, ne_label);
      offset += GET_MODE_SIZE (unit_mode);
    }

  emit_label (ne_label);
  rtx_insn *insns = get_insns ();
  end_sequence ();
  emit_insn (insns);

  return result;
}

/* Inline expansion of a call to str(n)cmp and memcmp, with result going
   to TARGET if that's convenient.
   If the call is not been inlined, return NULL_RTX.  */

static rtx
inline_expand_builtin_bytecmp (tree exp, rtx target)
{
  tree fndecl = get_callee_fndecl (exp);
  enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
  bool is_ncmp = (fcode == BUILT_IN_STRNCMP || fcode == BUILT_IN_MEMCMP);

  /* Do NOT apply this inlining expansion when optimizing for size or
     optimization level below 2.  */
  if (optimize < 2 || optimize_insn_for_size_p ())
    return NULL_RTX;

  gcc_checking_assert (fcode == BUILT_IN_STRCMP
		       || fcode == BUILT_IN_STRNCMP
		       || fcode == BUILT_IN_MEMCMP);

  /* On a target where the type of the call (int) has same or narrower presicion
     than unsigned char, give up the inlining expansion.  */
  if (TYPE_PRECISION (unsigned_char_type_node)
      >= TYPE_PRECISION (TREE_TYPE (exp)))
    return NULL_RTX;

  tree arg1 = CALL_EXPR_ARG (exp, 0);
  tree arg2 = CALL_EXPR_ARG (exp, 1);
  tree len3_tree = is_ncmp ? CALL_EXPR_ARG (exp, 2) : NULL_TREE;

  unsigned HOST_WIDE_INT len1 = 0;
  unsigned HOST_WIDE_INT len2 = 0;
  unsigned HOST_WIDE_INT len3 = 0;

  /* Get the object representation of the initializers of ARG1 and ARG2
     as strings, provided they refer to constant objects, with their byte
     sizes in LEN1 and LEN2, respectively.  */
  const char *bytes1 = getbyterep (arg1, &len1);
  const char *bytes2 = getbyterep (arg2, &len2);

  /* Fail if neither argument refers to an initialized constant.  */
  if (!bytes1 && !bytes2)
    return NULL_RTX;

  if (is_ncmp)
    {
      /* Fail if the memcmp/strncmp bound is not a constant.  */
      if (!tree_fits_uhwi_p (len3_tree))
	return NULL_RTX;

      len3 = tree_to_uhwi (len3_tree);

      if (fcode == BUILT_IN_MEMCMP)
	{
	  /* Fail if the memcmp bound is greater than the size of either
	     of the two constant objects.  */
	  if ((bytes1 && len1 < len3)
	      || (bytes2 && len2 < len3))
	    return NULL_RTX;
	}
    }

  if (fcode != BUILT_IN_MEMCMP)
    {
      /* For string functions (i.e., strcmp and strncmp) reduce LEN1
	 and LEN2 to the length of the nul-terminated string stored
	 in each.  */
      if (bytes1 != NULL)
	len1 = strnlen (bytes1, len1) + 1;
      if (bytes2 != NULL)
	len2 = strnlen (bytes2, len2) + 1;
    }

  /* See inline_string_cmp.  */
  int const_str_n;
  if (!len1)
    const_str_n = 2;
  else if (!len2)
    const_str_n = 1;
  else if (len2 > len1)
    const_str_n = 1;
  else
    const_str_n = 2;

  /* For strncmp only, compute the new bound as the smallest of
     the lengths of the two strings (plus 1) and the bound provided
     to the function.  */
  unsigned HOST_WIDE_INT bound = (const_str_n == 1) ? len1 : len2;
  if (is_ncmp && len3 < bound)
    bound = len3;

  /* If the bound of the comparison is larger than the threshold,
     do nothing.  */
  if (bound > (unsigned HOST_WIDE_INT) param_builtin_string_cmp_inline_length)
    return NULL_RTX;

  machine_mode mode = TYPE_MODE (TREE_TYPE (exp));

  /* Now, start inline expansion the call.  */
  return inline_string_cmp (target, (const_str_n == 1) ? arg2 : arg1,
			    (const_str_n == 1) ? bytes1 : bytes2, bound,
			    const_str_n, mode);
}

/* Expand a call to __builtin_speculation_safe_value_<N>.  MODE
   represents the size of the first argument to that call, or VOIDmode
   if the argument is a pointer.  IGNORE will be true if the result
   isn't used.  */
static rtx
expand_speculation_safe_value (machine_mode mode, tree exp, rtx target,
			       bool ignore)
{
  rtx val, failsafe;
  unsigned nargs = call_expr_nargs (exp);

  tree arg0 = CALL_EXPR_ARG (exp, 0);

  if (mode == VOIDmode)
    {
      mode = TYPE_MODE (TREE_TYPE (arg0));
      gcc_assert (GET_MODE_CLASS (mode) == MODE_INT);
    }

  val = expand_expr (arg0, NULL_RTX, mode, EXPAND_NORMAL);

  /* An optional second argument can be used as a failsafe value on
     some machines.  If it isn't present, then the failsafe value is
     assumed to be 0.  */
  if (nargs > 1)
    {
      tree arg1 = CALL_EXPR_ARG (exp, 1);
      failsafe = expand_expr (arg1, NULL_RTX, mode, EXPAND_NORMAL);
    }
  else
    failsafe = const0_rtx;

  /* If the result isn't used, the behavior is undefined.  It would be
     nice to emit a warning here, but path splitting means this might
     happen with legitimate code.  So simply drop the builtin
     expansion in that case; we've handled any side-effects above.  */
  if (ignore)
    return const0_rtx;

  /* If we don't have a suitable target, create one to hold the result.  */
  if (target == NULL || GET_MODE (target) != mode)
    target = gen_reg_rtx (mode);

  if (GET_MODE (val) != mode && GET_MODE (val) != VOIDmode)
    val = convert_modes (mode, VOIDmode, val, false);

  return targetm.speculation_safe_value (mode, target, val, failsafe);
}

/* Expand an expression EXP that calls a built-in function,
   with result going to TARGET if that's convenient
   (and in mode MODE if that's convenient).
   SUBTARGET may be used as the target for computing one of EXP's operands.
   IGNORE is nonzero if the value is to be ignored.  */

rtx
expand_builtin (tree exp, rtx target, rtx subtarget, machine_mode mode,
		int ignore)
{
  tree fndecl = get_callee_fndecl (exp);
  machine_mode target_mode = TYPE_MODE (TREE_TYPE (exp));
  int flags;

  if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
    return targetm.expand_builtin (exp, target, subtarget, mode, ignore);

  /* When ASan is enabled, we don't want to expand some memory/string
     builtins and rely on libsanitizer's hooks.  This allows us to avoid
     redundant checks and be sure, that possible overflow will be detected
     by ASan.  */

  enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
  if ((flag_sanitize & SANITIZE_ADDRESS) && asan_intercepted_p (fcode))
    return expand_call (exp, target, ignore);

  /* When not optimizing, generate calls to library functions for a certain
     set of builtins.  */
  if (!optimize
      && !called_as_built_in (fndecl)
      && fcode != BUILT_IN_FORK
      && fcode != BUILT_IN_EXECL
      && fcode != BUILT_IN_EXECV
      && fcode != BUILT_IN_EXECLP
      && fcode != BUILT_IN_EXECLE
      && fcode != BUILT_IN_EXECVP
      && fcode != BUILT_IN_EXECVE
      && fcode != BUILT_IN_CLEAR_CACHE
      && !ALLOCA_FUNCTION_CODE_P (fcode)
      && fcode != BUILT_IN_FREE)
    return expand_call (exp, target, ignore);

  /* The built-in function expanders test for target == const0_rtx
     to determine whether the function's result will be ignored.  */
  if (ignore)
    target = const0_rtx;

  /* If the result of a pure or const built-in function is ignored, and
     none of its arguments are volatile, we can avoid expanding the
     built-in call and just evaluate the arguments for side-effects.  */
  if (target == const0_rtx
      && ((flags = flags_from_decl_or_type (fndecl)) & (ECF_CONST | ECF_PURE))
      && !(flags & ECF_LOOPING_CONST_OR_PURE))
    {
      bool volatilep = false;
      tree arg;
      call_expr_arg_iterator iter;

      FOR_EACH_CALL_EXPR_ARG (arg, iter, exp)
	if (TREE_THIS_VOLATILE (arg))
	  {
	    volatilep = true;
	    break;
	  }

      if (! volatilep)
	{
	  FOR_EACH_CALL_EXPR_ARG (arg, iter, exp)
	    expand_expr (arg, const0_rtx, VOIDmode, EXPAND_NORMAL);
	  return const0_rtx;
	}
    }

  switch (fcode)
    {
    CASE_FLT_FN (BUILT_IN_FABS):
    CASE_FLT_FN_FLOATN_NX (BUILT_IN_FABS):
    case BUILT_IN_FABSD32:
    case BUILT_IN_FABSD64:
    case BUILT_IN_FABSD128:
      target = expand_builtin_fabs (exp, target, subtarget);
      if (target)
	return target;
      break;

    CASE_FLT_FN (BUILT_IN_COPYSIGN):
    CASE_FLT_FN_FLOATN_NX (BUILT_IN_COPYSIGN):
      target = expand_builtin_copysign (exp, target, subtarget);
      if (target)
	return target;
      break;

      /* Just do a normal library call if we were unable to fold
	 the values.  */
    CASE_FLT_FN (BUILT_IN_CABS):
      break;

    CASE_FLT_FN (BUILT_IN_FMA):
    CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMA):
      target = expand_builtin_mathfn_ternary (exp, target, subtarget);
      if (target)
	return target;
      break;

    CASE_FLT_FN (BUILT_IN_ILOGB):
      if (! flag_unsafe_math_optimizations)
	break;
      gcc_fallthrough ();
    CASE_FLT_FN (BUILT_IN_ISINF):
    CASE_FLT_FN (BUILT_IN_FINITE):
    case BUILT_IN_ISFINITE:
    case BUILT_IN_ISNORMAL:
      target = expand_builtin_interclass_mathfn (exp, target);
      if (target)
	return target;
      break;

    CASE_FLT_FN (BUILT_IN_ICEIL):
    CASE_FLT_FN (BUILT_IN_LCEIL):
    CASE_FLT_FN (BUILT_IN_LLCEIL):
    CASE_FLT_FN (BUILT_IN_LFLOOR):
    CASE_FLT_FN (BUILT_IN_IFLOOR):
    CASE_FLT_FN (BUILT_IN_LLFLOOR):
      target = expand_builtin_int_roundingfn (exp, target);
      if (target)
	return target;
      break;

    CASE_FLT_FN (BUILT_IN_IRINT):
    CASE_FLT_FN (BUILT_IN_LRINT):
    CASE_FLT_FN (BUILT_IN_LLRINT):
    CASE_FLT_FN (BUILT_IN_IROUND):
    CASE_FLT_FN (BUILT_IN_LROUND):
    CASE_FLT_FN (BUILT_IN_LLROUND):
      target = expand_builtin_int_roundingfn_2 (exp, target);
      if (target)
	return target;
      break;

    CASE_FLT_FN (BUILT_IN_POWI):
      target = expand_builtin_powi (exp, target);
      if (target)
	return target;
      break;

    CASE_FLT_FN (BUILT_IN_CEXPI):
      target = expand_builtin_cexpi (exp, target);
      gcc_assert (target);
      return target;

    CASE_FLT_FN (BUILT_IN_SIN):
    CASE_FLT_FN (BUILT_IN_COS):
      if (! flag_unsafe_math_optimizations)
	break;
      target = expand_builtin_mathfn_3 (exp, target, subtarget);