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/* This pass applies a few simple peephole optimizations.
Copyright (C) 2006-2009 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, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.
Authors:
Andrea Ornstein
Erven Rohou
Gabriele Svelto
Contact information at STMicroelectronics:
Andrea C. Ornstein <andrea.ornstein@st.com>
Contact information at INRIA:
Erven Rohou <erven.rohou@inria.fr>
*/
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "flags.h"
#include "timevar.h"
#include "tree.h"
#include "tree-pass.h"
#include "cil-stmt.h"
#include "cil-types.h"
/******************************************************************************
* Local functions prototypes *
******************************************************************************/
static unsigned int cil_peephole (void);
static bool cil_peephole_gate (void);
/******************************************************************************
* Pass implementation *
******************************************************************************/
/* Main function of this pass, do some peephole optimizations:
LDLOCA/LDIND -> LDLOC
LDARGA/LDIND -> LDARG
LDLOCA/<instr>/STIND -> <instr>/STLOC
LDARGA/<instr>/STIND -> <instr>/STLOC */
static unsigned int
cil_peephole (void)
{
basic_block bb;
cil_stmt_iterator csi;
cil_stmt stmt;
enum cil_opcode opcode;
tree var;
bool loc;
FOR_EACH_BB (bb)
{
csi = csi_start_bb (bb);
while (!csi_end_p (csi))
{
stmt = csi_stmt (csi);
opcode = cil_opcode (stmt);
if (((opcode == CIL_LDLOCA) || (opcode == CIL_LDARGA))
&& !csi_one_before_end_p (csi))
{
var = cil_var (stmt);
loc = (opcode == CIL_LDLOCA);
csi_next (&csi);
stmt = csi_stmt (csi);
if (cil_ldind_p (stmt) && !cil_prefix_volatile (stmt))
{
csi_prev (&csi);
csi_remove (&csi);
opcode = loc ? CIL_LDLOC : CIL_LDARG;
csi_replace (&csi, cil_build_stmt_arg (opcode, var));
}
else if (cil_push_p (stmt) && !csi_one_before_end_p (csi))
{
csi_next (&csi);
stmt = csi_stmt (csi);
if (cil_stind_p (stmt) && !cil_prefix_volatile (stmt))
{
csi_prev (&csi);
csi_prev (&csi);
csi_remove (&csi);
csi_next (&csi);
opcode = loc ? CIL_STLOC : CIL_STARG;
csi_replace (&csi, cil_build_stmt_arg (opcode, var));
}
}
}
else
csi_next (&csi);
}
}
return 0;
}
/* Gate function of the peephole-optimizations pass. */
static bool
cil_peephole_gate (void)
{
return true;
}
/* Define the parameters of the peephole-optimizations pass. */
struct gimple_opt_pass pass_cil_peephole =
{
{
GIMPLE_PASS, /* type */
"cil_peephole", /* name */
cil_peephole_gate, /* gate */
cil_peephole, /* execute */
NULL, /* sub */
NULL, /* next */
0, /* static_pass_number */
TV_CIL_PEEPHOLE, /* tv_id */
PROP_cfg, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
TODO_ggc_collect /* todo_flags_finish */
}
};
/*
* Local variables:
* eval: (c-set-style "gnu")
* End:
*/
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