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// Dependency fusion reordering pass.
// Copyright (C) 2025 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/>.
//
// This pass uses the RTL-SSA representation to detect def-use pairs that are
// macro-op-fusible in the current microarchitecture (using the
// macro_fusion_pair_p () target hook) and place them next to one another, if
// possible.
#define INCLUDE_ALGORITHM
#define INCLUDE_FUNCTIONAL
#define INCLUDE_MEMORY
#define INCLUDE_ARRAY
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "rtl.h"
#include "df.h"
#include "rtl-ssa.h"
#include "print-rtl.h"
#include "tree-pass.h"
#include "cfgcleanup.h"
#include "target.h"
#include "dbgcnt.h"
namespace {
const pass_data pass_data_dep_fusion =
{
RTL_PASS, // type
"dep_fusion", // name
OPTGROUP_NONE, // optinfo_flags
TV_NONE, // tv_id
0, // properties_required
0, // properties_provided
0, // properties_destroyed
0, // todo_flags_start
TODO_df_finish, // todo_flags_finish
};
class pass_dep_fusion : public rtl_opt_pass
{
public:
pass_dep_fusion (gcc::context *ctxt)
: rtl_opt_pass (pass_data_dep_fusion, ctxt)
{}
// opt_pass methods:
opt_pass *clone () final override { return new pass_dep_fusion (m_ctxt); }
bool gate (function *) final override;
unsigned int execute (function *) final override;
};
bool
pass_dep_fusion::gate (function *)
{
return optimize > 0 && flag_dep_fusion;
}
unsigned int
pass_dep_fusion::execute (function *fn)
{
// If the target has no macro fusion, there is nothing to be done.
if (!targetm.sched.macro_fusion_pair_p)
return 0;
// Initialization.
calculate_dominance_info (CDI_DOMINATORS);
df_analyze ();
crtl->ssa = new rtl_ssa::function_info (fn);
init_recog_no_volatile ();
for (rtl_ssa::insn_info *insn = *crtl->ssa->nondebug_insns ().begin ();
insn;
insn = insn->next_nondebug_insn ())
{
if (!insn->can_be_optimized () || insn->num_defs () != 1)
continue;
rtl_ssa::set_info *def = single_set_info (insn);
if (!def)
continue;
rtl_ssa::use_info *use_insn = def->single_nondebug_insn_use ();
if (!use_insn
|| !use_insn->insn ()->can_be_optimized ()
|| !targetm.sched.macro_fusion_pair_p (insn->rtl (),
use_insn->insn ()->rtl ()))
continue;
auto attempt = crtl->ssa->new_change_attempt ();
rtl_ssa::insn_change change (use_insn->insn ());
if (use_insn->insn () != insn->next_any_insn ())
{
if (!can_move_insn_p (use_insn->insn ()))
continue;
change.move_range = insn;
if (!rtl_ssa::restrict_movement (change))
continue;
if (dump_file && (dump_flags & TDF_DETAILS))
{
fprintf (dump_file, "Moved a single-use instruction:\n");
dump_insn_slim (dump_file, use_insn->insn ()->rtl ());
fprintf (dump_file, "right after its definition:\n");
dump_insn_slim (dump_file, insn->rtl ());
}
}
SCHED_GROUP_P (use_insn->insn ()->rtl ()) = 1;
confirm_change_group ();
crtl->ssa->change_insn (change);
}
// Finalization.
if (crtl->ssa->perform_pending_updates ())
cleanup_cfg (0);
delete crtl->ssa;
init_recog ();
free_dominance_info (CDI_DOMINATORS);
return 0;
}
} // end namespace
// Create a new dep fusion pass instance.
rtl_opt_pass *
make_pass_dep_fusion (gcc::context *ctxt)
{
return new pass_dep_fusion (ctxt);
}
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