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/* Subroutines for manipulating rtx's in semantically interesting ways.
   Copyright (C) 1987, 1991, 1994, 1995, 1996, 1997, 1998,
   1999, 2000, 2001, 2002, 2003 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 2, 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 COPYING.  If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */


#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "toplev.h"
#include "rtl.h"
#include "tree.h"
#include "tm_p.h"
#include "flags.h"
#include "function.h"
#include "expr.h"
#include "optabs.h"
#include "hard-reg-set.h"
#include "insn-config.h"
#include "ggc.h"
#include "recog.h"
#include "langhooks.h"

static rtx break_out_memory_refs (rtx);
static void emit_stack_probe (rtx);


/* Truncate and perhaps sign-extend C as appropriate for MODE.  */

HOST_WIDE_INT
trunc_int_for_mode (HOST_WIDE_INT c, enum machine_mode mode)
{
  int width = GET_MODE_BITSIZE (mode);

  /* You want to truncate to a _what_?  */
  if (! SCALAR_INT_MODE_P (mode))
    abort ();

  /* Canonicalize BImode to 0 and STORE_FLAG_VALUE.  */
  if (mode == BImode)
    return c & 1 ? STORE_FLAG_VALUE : 0;

  /* Sign-extend for the requested mode.  */

  if (width < HOST_BITS_PER_WIDE_INT)
    {
      HOST_WIDE_INT sign = 1;
      sign <<= width - 1;
      c &= (sign << 1) - 1;
      c ^= sign;
      c -= sign;
    }

  return c;
}

/* Return an rtx for the sum of X and the integer C.

   This function should be used via the `plus_constant' macro.  */

rtx
plus_constant_wide (rtx x, HOST_WIDE_INT c)
{
  RTX_CODE code;
  rtx y;
  enum machine_mode mode;
  rtx tem;
  int all_constant = 0;

  if (c == 0)
    return x;

 restart:

  code = GET_CODE (x);
  mode = GET_MODE (x);
  y = x;

  switch (code)
    {
    case CONST_INT:
      return GEN_INT (INTVAL (x) + c);

    case CONST_DOUBLE:
      {
	unsigned HOST_WIDE_INT l1 = CONST_DOUBLE_LOW (x);
	HOST_WIDE_INT h1 = CONST_DOUBLE_HIGH (x);
	unsigned HOST_WIDE_INT l2 = c;
	HOST_WIDE_INT h2 = c < 0 ? ~0 : 0;
	unsigned HOST_WIDE_INT lv;
	HOST_WIDE_INT hv;

	add_double (l1, h1, l2, h2, &lv, &hv);

	return immed_double_const (lv, hv, VOIDmode);
      }

    case MEM:
      /* If this is a reference to the constant pool, try replacing it with
	 a reference to a new constant.  If the resulting address isn't
	 valid, don't return it because we have no way to validize it.  */
      if (GET_CODE (XEXP (x, 0)) == SYMBOL_REF
	  && CONSTANT_POOL_ADDRESS_P (XEXP (x, 0)))
	{
	  tem
	    = force_const_mem (GET_MODE (x),
			       plus_constant (get_pool_constant (XEXP (x, 0)),
					      c));
	  if (memory_address_p (GET_MODE (tem), XEXP (tem, 0)))
	    return tem;
	}
      break;

    case CONST:
      /* If adding to something entirely constant, set a flag
	 so that we can add a CONST around the result.  */
      x = XEXP (x, 0);
      all_constant = 1;
      goto restart;

    case SYMBOL_REF:
    case LABEL_REF:
      all_constant = 1;
      break;

    case PLUS:
      /* The interesting case is adding the integer to a sum.
	 Look for constant term in the sum and combine
	 with C.  For an integer constant term, we make a combined
	 integer.  For a constant term that is not an explicit integer,
	 we cannot really combine, but group them together anyway.

	 Restart or use a recursive call in case the remaining operand is
	 something that we handle specially, such as a SYMBOL_REF.

	 We may not immediately return from the recursive call here, lest
	 all_constant gets lost.  */

      if (GET_CODE (XEXP (x, 1)) == CONST_INT)
	{
	  c += INTVAL (XEXP (x, 1));

	  if (GET_MODE (x) != VOIDmode)
	    c = trunc_int_for_mode (c, GET_MODE (x));

	  x = XEXP (x, 0);
	  goto restart;
	}
      else if (CONSTANT_P (XEXP (x, 1)))
	{
	  x = gen_rtx_PLUS (mode, XEXP (x, 0), plus_constant (XEXP (x, 1), c));
	  c = 0;
	}
      else if (find_constant_term_loc (&y))
	{
	  /* We need to be careful since X may be shared and we can't
	     modify it in place.  */
	  rtx copy = copy_rtx (x);
	  rtx *const_loc = find_constant_term_loc (&copy);

	  *const_loc = plus_constant (*const_loc, c);
	  x = copy;
	  c = 0;
	}
      break;

    default:
      break;
    }

  if (c != 0)
    x = gen_rtx_PLUS (mode, x, GEN_INT (c));

  if (GET_CODE (x) == SYMBOL_REF || GET_CODE (x) == LABEL_REF)
    return x;
  else if (all_constant)
    return gen_rtx_CONST (mode, x);
  else
    return x;
}

/* If X is a sum, return a new sum like X but lacking any constant terms.
   Add all the removed constant terms into *CONSTPTR.
   X itself is not altered.  The result != X if and only if
   it is not isomorphic to X.  */

rtx
eliminate_constant_term (rtx x, rtx *constptr)
{
  rtx x0, x1;
  rtx tem;

  if (GET_CODE (x) != PLUS)
    return x;

  /* First handle constants appearing at this level explicitly.  */
  if (GET_CODE (XEXP (x, 1)) == CONST_INT
      && 0 != (tem = simplify_binary_operation (PLUS, GET_MODE (x), *constptr,
						XEXP (x, 1)))
      && GET_CODE (tem) == CONST_INT)
    {
      *constptr = tem;
      return eliminate_constant_term (XEXP (x, 0), constptr);
    }

  tem = const0_rtx;
  x0 = eliminate_constant_term (XEXP (x, 0), &tem);
  x1 = eliminate_constant_term (XEXP (x, 1), &tem);
  if ((x1 != XEXP (x, 1) || x0 != XEXP (x, 0))
      && 0 != (tem = simplify_binary_operation (PLUS, GET_MODE (x),
						*constptr, tem))
      && GET_CODE (tem) == CONST_INT)
    {
      *constptr = tem;
      return gen_rtx_PLUS (GET_MODE (x), x0, x1);
    }

  return x;
}

/* Return an rtx for the size in bytes of the value of EXP.  */

rtx
expr_size (tree exp)
{
  tree size = (*lang_hooks.expr_size) (exp);

  if (CONTAINS_PLACEHOLDER_P (size))
    size = build (WITH_RECORD_EXPR, sizetype, size, exp);

  return expand_expr (size, NULL_RTX, TYPE_MODE (sizetype), 0);
}

/* Return a wide integer for the size in bytes of the value of EXP, or -1
   if the size can vary or is larger than an integer.  */

HOST_WIDE_INT
int_expr_size (tree exp)
{
  tree t = (*lang_hooks.expr_size) (exp);

  if (t == 0
      || TREE_CODE (t) != INTEGER_CST
      || TREE_OVERFLOW (t)
      || TREE_INT_CST_HIGH (t) != 0
      /* If the result would appear negative, it's too big to represent.  */
      || (HOST_WIDE_INT) TREE_INT_CST_LOW (t) < 0)
    return -1;

  return TREE_INT_CST_LOW (t);
}

/* Return a copy of X in which all memory references
   and all constants that involve symbol refs
   have been replaced with new temporary registers.
   Also emit code to load the memory locations and constants
   into those registers.

   If X contains no such constants or memory references,
   X itself (not a copy) is returned.

   If a constant is found in the address that is not a legitimate constant
   in an insn, it is left alone in the hope that it might be valid in the
   address.

   X may contain no arithmetic except addition, subtraction and multiplication.
   Values returned by expand_expr with 1 for sum_ok fit this constraint.  */

static rtx
break_out_memory_refs (rtx x)
{
  if (GET_CODE (x) == MEM
      || (CONSTANT_P (x) && CONSTANT_ADDRESS_P (x)
	  && GET_MODE (x) != VOIDmode))
    x = force_reg (GET_MODE (x), x);
  else if (GET_CODE (x) == PLUS || GET_CODE (x) == MINUS
	   || GET_CODE (x) == MULT)
    {
      rtx op0 = break_out_memory_refs (XEXP (x, 0));
      rtx op1 = break_out_memory_refs (XEXP (x, 1));

      if (op0 != XEXP (x, 0) || op1 != XEXP (x, 1))
	x = gen_rtx_fmt_ee (GET_CODE (x), Pmode, op0, op1);
    }

  return x;
}

/* Given X, a memory address in ptr_mode, convert it to an address
   in Pmode, or vice versa (TO_MODE says which way).  We take advantage of
   the fact that pointers are not allowed to overflow by commuting arithmetic
   operations over conversions so that address arithmetic insns can be
   used.  */

rtx
convert_memory_address (enum machine_mode to_mode ATTRIBUTE_UNUSED, 
			rtx x)
{
#ifndef POINTERS_EXTEND_UNSIGNED
  return x;
#else /* defined(POINTERS_EXTEND_UNSIGNED) */
  enum machine_mode from_mode;
  rtx temp;
  enum rtx_code code;

  /* If X already has the right mode, just return it.  */
  if (GET_MODE (x) == to_mode)
    return x;

  from_mode = to_mode == ptr_mode ? Pmode : ptr_mode;

  /* Here we handle some special cases.  If none of them apply, fall through
     to the default case.  */
  switch (GET_CODE (x))
    {
    case CONST_INT:
    case CONST_DOUBLE:
      if (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (from_mode))
	code = TRUNCATE;
      else if (POINTERS_EXTEND_UNSIGNED < 0)
	break;
      else if (POINTERS_EXTEND_UNSIGNED > 0)
	code = ZERO_EXTEND;
      else
	code = SIGN_EXTEND;
      temp = simplify_unary_operation (code, to_mode, x, from_mode);
      if (temp)
	return temp;
      break;

    case SUBREG:
      if ((SUBREG_PROMOTED_VAR_P (x) || REG_POINTER (SUBREG_REG (x)))
	  && GET_MODE (SUBREG_REG (x)) == to_mode)
	return SUBREG_REG (x);
      break;

    case LABEL_REF:
      temp = gen_rtx_LABEL_REF (to_mode, XEXP (x, 0));
      LABEL_REF_NONLOCAL_P (temp) = LABEL_REF_NONLOCAL_P (x);
      return temp;
      break;

    case SYMBOL_REF:
      temp = shallow_copy_rtx (x);
      PUT_MODE (temp, to_mode);
      return temp;
      break;

    case CONST:
      return gen_rtx_CONST (to_mode,
			    convert_memory_address (to_mode, XEXP (x, 0)));
      break;

    case PLUS:
    case MULT:
      /* For addition we can safely permute the conversion and addition
	 operation if one operand is a constant and converting the constant
	 does not change it.  We can always safely permute them if we are
	 making the address narrower.  */
      if (GET_MODE_SIZE (to_mode) < GET_MODE_SIZE (from_mode)
	  || (GET_CODE (x) == PLUS
	      && GET_CODE (XEXP (x, 1)) == CONST_INT
	      && XEXP (x, 1) == convert_memory_address (to_mode, XEXP (x, 1))))
	return gen_rtx_fmt_ee (GET_CODE (x), to_mode,
			       convert_memory_address (to_mode, XEXP (x, 0)),
			       XEXP (x, 1));
      break;

    default:
      break;
    }

  return convert_modes (to_mode, from_mode,
			x, POINTERS_EXTEND_UNSIGNED);
#endif /* defined(POINTERS_EXTEND_UNSIGNED) */
}

/* Given a memory address or facsimile X, construct a new address,
   currently equivalent, that is stable: future stores won't change it.

   X must be composed of constants, register and memory references
   combined with addition, subtraction and multiplication:
   in other words, just what you can get from expand_expr if sum_ok is 1.

   Works by making copies of all regs and memory locations used
   by X and combining them the same way X does.
   You could also stabilize the reference to this address
   by copying the address to a register with copy_to_reg;
   but then you wouldn't get indexed addressing in the reference.  */

rtx
copy_all_regs (rtx x)
{
  if (GET_CODE (x) == REG)
    {
      if (REGNO (x) != FRAME_POINTER_REGNUM
#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
	  && REGNO (x) != HARD_FRAME_POINTER_REGNUM
#endif
	  )
	x = copy_to_reg (x);
    }
  else if (GET_CODE (x) == MEM)
    x = copy_to_reg (x);
  else if (GET_CODE (x) == PLUS || GET_CODE (x) == MINUS
	   || GET_CODE (x) == MULT)
    {
      rtx op0 = copy_all_regs (XEXP (x, 0));
      rtx op1 = copy_all_regs (XEXP (x, 1));
      if (op0 != XEXP (x, 0) || op1 != XEXP (x, 1))
	x = gen_rtx_fmt_ee (GET_CODE (x), Pmode, op0, op1);
    }
  return x;
}

/* Return something equivalent to X but valid as a memory address
   for something of mode MODE.  When X is not itself valid, this
   works by copying X or subexpressions of it into registers.  */

rtx
memory_address (enum machine_mode mode, rtx x)
{
  rtx oldx = x;

  if (GET_CODE (x) == ADDRESSOF)
    return x;

  x = convert_memory_address (Pmode, x);

  /* By passing constant addresses thru registers
     we get a chance to cse them.  */
  if (! cse_not_expected && CONSTANT_P (x) && CONSTANT_ADDRESS_P (x))
    x = force_reg (Pmode, x);

  /* Accept a QUEUED that refers to a REG
     even though that isn't a valid address.
     On attempting to put this in an insn we will call protect_from_queue
     which will turn it into a REG, which is valid.  */
  else if (GET_CODE (x) == QUEUED
      && GET_CODE (QUEUED_VAR (x)) == REG)
    ;

  /* We get better cse by rejecting indirect addressing at this stage.
     Let the combiner create indirect addresses where appropriate.
     For now, generate the code so that the subexpressions useful to share
     are visible.  But not if cse won't be done!  */
  else
    {
      if (! cse_not_expected && GET_CODE (x) != REG)
	x = break_out_memory_refs (x);

      /* At this point, any valid address is accepted.  */
      GO_IF_LEGITIMATE_ADDRESS (mode, x, win);

      /* If it was valid before but breaking out memory refs invalidated it,
	 use it the old way.  */
      if (memory_address_p (mode, oldx))
	goto win2;

      /* Perform machine-dependent transformations on X
	 in certain cases.  This is not necessary since the code
	 below can handle all possible cases, but machine-dependent
	 transformations can make better code.  */
      LEGITIMIZE_ADDRESS (x, oldx, mode, win);

      /* PLUS and MULT can appear in special ways
	 as the result of attempts to make an address usable for indexing.
	 Usually they are dealt with by calling force_operand, below.
	 But a sum containing constant terms is special
	 if removing them makes the sum a valid address:
	 then we generate that address in a register
	 and index off of it.  We do this because it often makes
	 shorter code, and because the addresses thus generated
	 in registers often become common subexpressions.  */
      if (GET_CODE (x) == PLUS)
	{
	  rtx constant_term = const0_rtx;
	  rtx y = eliminate_constant_term (x, &constant_term);
	  if (constant_term == const0_rtx
	      || ! memory_address_p (mode, y))
	    x = force_operand (x, NULL_RTX);
	  else
	    {
	      y = gen_rtx_PLUS (GET_MODE (x), copy_to_reg (y), constant_term);
	      if (! memory_address_p (mode, y))
		x = force_operand (x, NULL_RTX);
	      else
		x = y;
	    }
	}

      else if (GET_CODE (x) == MULT || GET_CODE (x) == MINUS)
	x = force_operand (x, NULL_RTX);

      /* If we have a register that's an invalid address,
	 it must be a hard reg of the wrong class.  Copy it to a pseudo.  */
      else if (GET_CODE (x) == REG)
	x = copy_to_reg (x);

      /* Last resort: copy the value to a register, since
	 the register is a valid address.  */
      else
	x = force_reg (Pmode, x);

      goto done;

    win2:
      x = oldx;
    win:
      if (flag_force_addr && ! cse_not_expected && GET_CODE (x) != REG
	  /* Don't copy an addr via a reg if it is one of our stack slots.  */
	  && ! (GET_CODE (x) == PLUS
		&& (XEXP (x, 0) == virtual_stack_vars_rtx
		    || XEXP (x, 0) == virtual_incoming_args_rtx)))
	{
	  if (general_operand (x, Pmode))
	    x = force_reg (Pmode, x);
	  else
	    x = force_operand (x, NULL_RTX);
	}
    }

 done:

  /* If we didn't change the address, we are done.  Otherwise, mark
     a reg as a pointer if we have REG or REG + CONST_INT.  */
  if (oldx == x)
    return x;
  else if (GET_CODE (x) == REG)
    mark_reg_pointer (x, BITS_PER_UNIT);
  else if (GET_CODE (x) == PLUS
	   && GET_CODE (XEXP (x, 0)) == REG
	   && GET_CODE (XEXP (x, 1)) == CONST_INT)
    mark_reg_pointer (XEXP (x, 0), BITS_PER_UNIT);

  /* OLDX may have been the address on a temporary.  Update the address
     to indicate that X is now used.  */
  update_temp_slot_address (oldx, x);

  return x;
}

/* Like `memory_address' but pretend `flag_force_addr' is 0.  */

rtx
memory_address_noforce (enum machine_mode mode, rtx x)
{
  int ambient_force_addr = flag_force_addr;
  rtx val;

  flag_force_addr = 0;
  val = memory_address (mode, x);
  flag_force_addr = ambient_force_addr;
  return val;
}

/* Convert a mem ref into one with a valid memory address.
   Pass through anything else unchanged.  */

rtx
validize_mem (rtx ref)
{
  if (GET_CODE (ref) != MEM)
    return ref;
  if (! (flag_force_addr && CONSTANT_ADDRESS_P (XEXP (ref, 0)))
      && memory_address_p (GET_MODE (ref), XEXP (ref, 0)))
    return ref;

  /* Don't alter REF itself, since that is probably a stack slot.  */
  return replace_equiv_address (ref, XEXP (ref, 0));
}

/* Given REF, either a MEM or a REG, and T, either the type of X or
   the expression corresponding to REF, set RTX_UNCHANGING_P if
   appropriate.  */

void
maybe_set_unchanging (rtx ref, tree t)
{
  /* We can set RTX_UNCHANGING_P from TREE_READONLY for decls whose
     initialization is only executed once, or whose initializer always
     has the same value.  Currently we simplify this to PARM_DECLs in the
     first case, and decls with TREE_CONSTANT initializers in the second.

     We cannot do this for non-static aggregates, because of the double
     writes that can be generated by store_constructor, depending on the
     contents of the initializer.  Yes, this does eliminate a good fraction
     of the number of uses of RTX_UNCHANGING_P for a language like Ada.
     It also eliminates a good quantity of bugs.  Let this be incentive to
     eliminate RTX_UNCHANGING_P entirely in favor of a more reliable
     solution, perhaps based on alias sets.  */

  if ((TREE_READONLY (t) && DECL_P (t)
       && (TREE_STATIC (t) || ! AGGREGATE_TYPE_P (TREE_TYPE (t)))
       && (TREE_CODE (t) == PARM_DECL
	   || (DECL_INITIAL (t) && TREE_CONSTANT (DECL_INITIAL (t)))))
      || TREE_CODE_CLASS (TREE_CODE (t)) == 'c')
    RTX_UNCHANGING_P (ref) = 1;
}

/* Return a modified copy of X with its memory address copied
   into a temporary register to protect it from side effects.
   If X is not a MEM, it is returned unchanged (and not copied).
   Perhaps even if it is a MEM, if there is no need to change it.  */

rtx
stabilize (rtx x)
{
  if (GET_CODE (x) != MEM
      || ! rtx_unstable_p (XEXP (x, 0)))
    return x;

  return
    replace_equiv_address (x, force_reg (Pmode, copy_all_regs (XEXP (x, 0))));
}

/* Copy the value or contents of X to a new temp reg and return that reg.  */

rtx
copy_to_reg (rtx x)
{
  rtx temp = gen_reg_rtx (GET_MODE (x));

  /* If not an operand, must be an address with PLUS and MULT so
     do the computation.  */
  if (! general_operand (x, VOIDmode))
    x = force_operand (x, temp);

  if (x != temp)
    emit_move_insn (temp, x);

  return temp;
}

/* Like copy_to_reg but always give the new register mode Pmode
   in case X is a constant.  */

rtx
copy_addr_to_reg (rtx x)
{
  return copy_to_mode_reg (Pmode, x);
}

/* Like copy_to_reg but always give the new register mode MODE
   in case X is a constant.  */

rtx
copy_to_mode_reg (enum machine_mode mode, rtx x)
{
  rtx temp = gen_reg_rtx (mode);

  /* If not an operand, must be an address with PLUS and MULT so
     do the computation.  */
  if (! general_operand (x, VOIDmode))
    x = force_operand (x, temp);

  if (GET_MODE (x) != mode && GET_MODE (x) != VOIDmode)
    abort ();
  if (x != temp)
    emit_move_insn (temp, x);
  return temp;
}

/* Load X into a register if it is not already one.
   Use mode MODE for the register.
   X should be valid for mode MODE, but it may be a constant which
   is valid for all integer modes; that's why caller must specify MODE.

   The caller must not alter the value in the register we return,
   since we mark it as a "constant" register.  */

rtx
force_reg (enum machine_mode mode, rtx x)
{
  rtx temp, insn, set;

  if (GET_CODE (x) == REG)
    return x;

  if (general_operand (x, mode))
    {
      temp = gen_reg_rtx (mode);
      insn = emit_move_insn (temp, x);
    }
  else
    {
      temp = force_operand (x, NULL_RTX);
      if (GET_CODE (temp) == REG)
	insn = get_last_insn ();
      else
	{
	  rtx temp2 = gen_reg_rtx (mode);
	  insn = emit_move_insn (temp2, temp);
	  temp = temp2;
	}
    }

  /* Let optimizers know that TEMP's value never changes
     and that X can be substituted for it.  Don't get confused
     if INSN set something else (such as a SUBREG of TEMP).  */
  if (CONSTANT_P (x)
      && (set = single_set (insn)) != 0
      && SET_DEST (set) == temp
      && ! rtx_equal_p (x, SET_SRC (set)))
    set_unique_reg_note (insn, REG_EQUAL, x);

  return temp;
}

/* If X is a memory ref, copy its contents to a new temp reg and return
   that reg.  Otherwise, return X.  */

rtx
force_not_mem (rtx x)
{
  rtx temp;

  if (GET_CODE (x) != MEM || GET_MODE (x) == BLKmode)
    return x;

  temp = gen_reg_rtx (GET_MODE (x));
  emit_move_insn (temp, x);
  return temp;
}

/* Copy X to TARGET (if it's nonzero and a reg)
   or to a new temp reg and return that reg.
   MODE is the mode to use for X in case it is a constant.  */

rtx
copy_to_suggested_reg (rtx x, rtx target, enum machine_mode mode)
{
  rtx temp;

  if (target && GET_CODE (target) == REG)
    temp = target;
  else
    temp = gen_reg_rtx (mode);

  emit_move_insn (temp, x);
  return temp;
}

/* Return the mode to use to store a scalar of TYPE and MODE.
   PUNSIGNEDP points to the signedness of the type and may be adjusted
   to show what signedness to use on extension operations.

   FOR_CALL is nonzero if this call is promoting args for a call.  */

enum machine_mode
promote_mode (tree type, enum machine_mode mode, int *punsignedp,
	      int for_call ATTRIBUTE_UNUSED)
{
  enum tree_code code = TREE_CODE (type);
  int unsignedp = *punsignedp;

#ifdef PROMOTE_FOR_CALL_ONLY
  if (! for_call)
    return mode;
#endif

  switch (code)
    {
#ifdef PROMOTE_MODE
    case INTEGER_TYPE:   case ENUMERAL_TYPE:   case BOOLEAN_TYPE:
    case CHAR_TYPE:      case REAL_TYPE:       case OFFSET_TYPE:
      PROMOTE_MODE (mode, unsignedp, type);
      break;
#endif

#ifdef POINTERS_EXTEND_UNSIGNED
    case REFERENCE_TYPE:
    case POINTER_TYPE:
      mode = Pmode;
      unsignedp = POINTERS_EXTEND_UNSIGNED;
      break;
#endif

    default:
      break;
    }

  *punsignedp = unsignedp;
  return mode;
}

/* Adjust the stack pointer by ADJUST (an rtx for a number of bytes).
   This pops when ADJUST is positive.  ADJUST need not be constant.  */

void
adjust_stack (rtx adjust)
{
  rtx temp;
  adjust = protect_from_queue (adjust, 0);

  if (adjust == const0_rtx)
    return;

  /* We expect all variable sized adjustments to be multiple of
     PREFERRED_STACK_BOUNDARY.  */
  if (GET_CODE (adjust) == CONST_INT)
    stack_pointer_delta -= INTVAL (adjust);

  temp = expand_binop (Pmode,
#ifdef STACK_GROWS_DOWNWARD
		       add_optab,
#else
		       sub_optab,
#endif
		       stack_pointer_rtx, adjust, stack_pointer_rtx, 0,
		       OPTAB_LIB_WIDEN);

  if (temp != stack_pointer_rtx)
    emit_move_insn (stack_pointer_rtx, temp);
}

/* Adjust the stack pointer by minus ADJUST (an rtx for a number of bytes).
   This pushes when ADJUST is positive.  ADJUST need not be constant.  */

void
anti_adjust_stack (rtx adjust)
{
  rtx temp;
  adjust = protect_from_queue (adjust, 0);

  if (adjust == const0_rtx)
    return;

  /* We expect all variable sized adjustments to be multiple of
     PREFERRED_STACK_BOUNDARY.  */
  if (GET_CODE (adjust) == CONST_INT)
    stack_pointer_delta += INTVAL (adjust);

  temp = expand_binop (Pmode,
#ifdef STACK_GROWS_DOWNWARD
		       sub_optab,
#else
		       add_optab,
#endif
		       stack_pointer_rtx, adjust, stack_pointer_rtx, 0,
		       OPTAB_LIB_WIDEN);

  if (temp != stack_pointer_rtx)
    emit_move_insn (stack_pointer_rtx, temp);
}

/* Round the size of a block to be pushed up to the boundary required
   by this machine.  SIZE is the desired size, which need not be constant.  */

rtx
round_push (rtx size)
{
  int align = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT;

  if (align == 1)
    return size;

  if (GET_CODE (size) == CONST_INT)
    {
      HOST_WIDE_INT new = (INTVAL (size) + align - 1) / align * align;

      if (INTVAL (size) != new)
	size = GEN_INT (new);
    }
  else
    {
      /* CEIL_DIV_EXPR needs to worry about the addition overflowing,
	 but we know it can't.  So add ourselves and then do
	 TRUNC_DIV_EXPR.  */
      size = expand_binop (Pmode, add_optab, size, GEN_INT (align - 1),
			   NULL_RTX, 1, OPTAB_LIB_WIDEN);
      size = expand_divmod (0, TRUNC_DIV_EXPR, Pmode, size, GEN_INT (align),
			    NULL_RTX, 1);
      size = expand_mult (Pmode, size, GEN_INT (align), NULL_RTX, 1);
    }

  return size;
}

/* Save the stack pointer for the purpose in SAVE_LEVEL.  PSAVE is a pointer
   to a previously-created save area.  If no save area has been allocated,
   this function will allocate one.  If a save area is specified, it
   must be of the proper mode.

   The insns are emitted after insn AFTER, if nonzero, otherwise the insns
   are emitted at the current position.  */

void
emit_stack_save (enum save_level save_level, rtx *psave, rtx after)
{
  rtx sa = *psave;
  /* The default is that we use a move insn and save in a Pmode object.  */
  rtx (*fcn) (rtx, rtx) = gen_move_insn;
  enum machine_mode mode = STACK_SAVEAREA_MODE (save_level);

  /* See if this machine has anything special to do for this kind of save.  */
  switch (save_level)
    {
#ifdef HAVE_save_stack_block
    case SAVE_BLOCK:
      if (HAVE_save_stack_block)
	fcn = gen_save_stack_block;
      break;
#endif
#ifdef HAVE_save_stack_function
    case SAVE_FUNCTION:
      if (HAVE_save_stack_function)
	fcn = gen_save_stack_function;
      break;
#endif
#ifdef HAVE_save_stack_nonlocal
    case SAVE_NONLOCAL:
      if (HAVE_save_stack_nonlocal)
	fcn = gen_save_stack_nonlocal;
      break;
#endif
    default:
      break;
    }

  /* If there is no save area and we have to allocate one, do so.  Otherwise
     verify the save area is the proper mode.  */

  if (sa == 0)
    {
      if (mode != VOIDmode)
	{
	  if (save_level == SAVE_NONLOCAL)
	    *psave = sa = assign_stack_local (mode, GET_MODE_SIZE (mode), 0);
	  else
	    *psave = sa = gen_reg_rtx (mode);
	}
    }
  else
    {
      if (mode == VOIDmode || GET_MODE (sa) != mode)
	abort ();
    }

  if (after)
    {
      rtx seq;

      start_sequence ();
      /* We must validize inside the sequence, to ensure that any instructions
	 created by the validize call also get moved to the right place.  */
      if (sa != 0)
	sa = validize_mem (sa);
      emit_insn (fcn (sa, stack_pointer_rtx));
      seq = get_insns ();
      end_sequence ();
      emit_insn_after (seq, after);
    }
  else
    {
      if (sa != 0)
	sa = validize_mem (sa);
      emit_insn (fcn (sa, stack_pointer_rtx));
    }
}

/* Restore the stack pointer for the purpose in SAVE_LEVEL.  SA is the save
   area made by emit_stack_save.  If it is zero, we have nothing to do.

   Put any emitted insns after insn AFTER, if nonzero, otherwise at
   current position.  */

void
emit_stack_restore (enum save_level save_level, rtx sa, rtx after)
{
  /* The default is that we use a move insn.  */
  rtx (*fcn) (rtx, rtx) = gen_move_insn;

  /* See if this machine has anything special to do for this kind of save.  */
  switch (save_level)
    {
#ifdef HAVE_restore_stack_block
    case SAVE_BLOCK:
      if (HAVE_restore_stack_block)
	fcn = gen_restore_stack_block;
      break;
#endif
#ifdef HAVE_restore_stack_function
    case SAVE_FUNCTION:
      if (HAVE_restore_stack_function)
	fcn = gen_restore_stack_function;
      break;
#endif
#ifdef HAVE_restore_stack_nonlocal
    case SAVE_NONLOCAL:
      if (HAVE_restore_stack_nonlocal)
	fcn = gen_restore_stack_nonlocal;
      break;
#endif
    default:
      break;
    }

  if (sa != 0)
    {
      sa = validize_mem (sa);
      /* These clobbers prevent the scheduler from moving
	 references to variable arrays below the code
	 that deletes (pops) the arrays.  */
      emit_insn (gen_rtx_CLOBBER (VOIDmode,
		    gen_rtx_MEM (BLKmode,
			gen_rtx_SCRATCH (VOIDmode))));
      emit_insn (gen_rtx_CLOBBER (VOIDmode,
		    gen_rtx_MEM (BLKmode, stack_pointer_rtx)));
    }

  if (after)
    {
      rtx seq;

      start_sequence ();
      emit_insn (fcn (stack_pointer_rtx, sa));


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