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/* Schedule GIMPLE vector statements.
Copyright (C) 2020 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/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "rtl.h"
#include "tree.h"
#include "gimple.h"
#include "tree-pass.h"
#include "ssa.h"
#include "expmed.h"
#include "optabs-tree.h"
#include "tree-eh.h"
#include "gimple-iterator.h"
#include "gimplify-me.h"
#include "gimplify.h"
#include "tree-cfg.h"
#include "bitmap.h"
#include "tree-ssa-dce.h"
/* Expand all VEC_COND_EXPR gimple assignments into calls to internal
function based on type of selected expansion. */
static gimple *
gimple_expand_vec_cond_expr (gimple_stmt_iterator *gsi,
hash_map<tree, unsigned int> *vec_cond_ssa_name_uses)
{
tree lhs, op0a = NULL_TREE, op0b = NULL_TREE;
enum tree_code code;
enum tree_code tcode;
machine_mode cmp_op_mode;
bool unsignedp;
enum insn_code icode;
imm_use_iterator imm_iter;
/* Only consider code == GIMPLE_ASSIGN. */
gassign *stmt = dyn_cast<gassign *> (gsi_stmt (*gsi));
if (!stmt)
return NULL;
code = gimple_assign_rhs_code (stmt);
if (code != VEC_COND_EXPR)
return NULL;
tree op0 = gimple_assign_rhs1 (stmt);
tree op1 = gimple_assign_rhs2 (stmt);
tree op2 = gimple_assign_rhs3 (stmt);
lhs = gimple_assign_lhs (stmt);
machine_mode mode = TYPE_MODE (TREE_TYPE (lhs));
gcc_assert (!COMPARISON_CLASS_P (op0));
if (TREE_CODE (op0) == SSA_NAME)
{
unsigned int used_vec_cond_exprs = 0;
unsigned int *slot = vec_cond_ssa_name_uses->get (op0);
if (slot)
used_vec_cond_exprs = *slot;
else
{
gimple *use_stmt;
FOR_EACH_IMM_USE_STMT (use_stmt, imm_iter, op0)
{
gassign *assign = dyn_cast<gassign *> (use_stmt);
if (assign != NULL
&& gimple_assign_rhs_code (assign) == VEC_COND_EXPR
&& gimple_assign_rhs1 (assign) == op0)
used_vec_cond_exprs++;
}
vec_cond_ssa_name_uses->put (op0, used_vec_cond_exprs);
}
gassign *def_stmt = dyn_cast<gassign *> (SSA_NAME_DEF_STMT (op0));
if (def_stmt)
{
tcode = gimple_assign_rhs_code (def_stmt);
op0a = gimple_assign_rhs1 (def_stmt);
op0b = gimple_assign_rhs2 (def_stmt);
tree op0a_type = TREE_TYPE (op0a);
if (used_vec_cond_exprs >= 2
&& (get_vcond_mask_icode (mode, TYPE_MODE (op0a_type))
!= CODE_FOR_nothing)
&& expand_vec_cmp_expr_p (op0a_type, TREE_TYPE (lhs), tcode))
{
/* Keep the SSA name and use vcond_mask. */
tcode = TREE_CODE (op0);
}
}
else
tcode = TREE_CODE (op0);
}
else
tcode = TREE_CODE (op0);
if (TREE_CODE_CLASS (tcode) != tcc_comparison)
{
gcc_assert (VECTOR_BOOLEAN_TYPE_P (TREE_TYPE (op0)));
if (get_vcond_mask_icode (mode, TYPE_MODE (TREE_TYPE (op0)))
!= CODE_FOR_nothing)
return gimple_build_call_internal (IFN_VCOND_MASK, 3, op0, op1, op2);
/* Fake op0 < 0. */
else
{
gcc_assert (GET_MODE_CLASS (TYPE_MODE (TREE_TYPE (op0)))
== MODE_VECTOR_INT);
op0a = op0;
op0b = build_zero_cst (TREE_TYPE (op0));
tcode = LT_EXPR;
}
}
cmp_op_mode = TYPE_MODE (TREE_TYPE (op0a));
unsignedp = TYPE_UNSIGNED (TREE_TYPE (op0a));
gcc_assert (known_eq (GET_MODE_SIZE (mode), GET_MODE_SIZE (cmp_op_mode))
&& known_eq (GET_MODE_NUNITS (mode),
GET_MODE_NUNITS (cmp_op_mode)));
icode = get_vcond_icode (mode, cmp_op_mode, unsignedp);
if (icode == CODE_FOR_nothing)
{
if (tcode == LT_EXPR
&& op0a == op0)
{
/* A VEC_COND_EXPR condition could be folded from EQ_EXPR/NE_EXPR
into a constant when only get_vcond_eq_icode is supported.
Try changing it to NE_EXPR. */
tcode = NE_EXPR;
}
if (tcode == EQ_EXPR || tcode == NE_EXPR)
{
tree tcode_tree = build_int_cst (integer_type_node, tcode);
return gimple_build_call_internal (IFN_VCONDEQ, 5, op0a, op0b, op1,
op2, tcode_tree);
}
}
gcc_assert (icode != CODE_FOR_nothing);
tree tcode_tree = build_int_cst (integer_type_node, tcode);
return gimple_build_call_internal (unsignedp ? IFN_VCONDU : IFN_VCOND,
5, op0a, op0b, op1, op2, tcode_tree);
}
/* Iterate all gimple statements and try to expand
VEC_COND_EXPR assignments. */
static unsigned int
gimple_expand_vec_cond_exprs (void)
{
gimple_stmt_iterator gsi;
basic_block bb;
hash_map<tree, unsigned int> vec_cond_ssa_name_uses;
auto_bitmap dce_ssa_names;
FOR_EACH_BB_FN (bb, cfun)
{
for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
{
gimple *g = gimple_expand_vec_cond_expr (&gsi,
&vec_cond_ssa_name_uses);
if (g != NULL)
{
tree lhs = gimple_assign_lhs (gsi_stmt (gsi));
gimple_set_lhs (g, lhs);
gsi_replace (&gsi, g, false);
}
}
}
for (hash_map<tree, unsigned int>::iterator it = vec_cond_ssa_name_uses.begin ();
it != vec_cond_ssa_name_uses.end (); ++it)
bitmap_set_bit (dce_ssa_names, SSA_NAME_VERSION ((*it).first));
simple_dce_from_worklist (dce_ssa_names);
return 0;
}
namespace {
const pass_data pass_data_gimple_isel =
{
GIMPLE_PASS, /* type */
"isel", /* name */
OPTGROUP_VEC, /* optinfo_flags */
TV_NONE, /* tv_id */
PROP_cfg, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_update_ssa, /* todo_flags_finish */
};
class pass_gimple_isel : public gimple_opt_pass
{
public:
pass_gimple_isel (gcc::context *ctxt)
: gimple_opt_pass (pass_data_gimple_isel, ctxt)
{}
/* opt_pass methods: */
virtual bool gate (function *)
{
return true;
}
virtual unsigned int execute (function *)
{
return gimple_expand_vec_cond_exprs ();
}
}; // class pass_gimple_isel
} // anon namespace
gimple_opt_pass *
make_pass_gimple_isel (gcc::context *ctxt)
{
return new pass_gimple_isel (ctxt);
}
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