mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-03 09:00:21 +00:00
432 lines
11 KiB
C
432 lines
11 KiB
C
/* Generate code from machine description to perform peephole optimizations.
|
||
Copyright (C) 1987, 1989, 1992, 1997, 1998,
|
||
1999, 2000, 2003, 2004 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. */
|
||
|
||
|
||
#include "bconfig.h"
|
||
#include "system.h"
|
||
#include "coretypes.h"
|
||
#include "tm.h"
|
||
#include "rtl.h"
|
||
#include "errors.h"
|
||
#include "gensupport.h"
|
||
|
||
|
||
/* While tree-walking an instruction pattern, we keep a chain
|
||
of these `struct link's to record how to get down to the
|
||
current position. In each one, POS is the operand number,
|
||
and if the operand is a vector VEC is the element number.
|
||
VEC is -1 if the operand is not a vector. */
|
||
|
||
struct link
|
||
{
|
||
struct link *next;
|
||
int pos;
|
||
int vecelt;
|
||
};
|
||
|
||
static int max_opno;
|
||
|
||
/* Number of operands used in current peephole definition. */
|
||
|
||
static int n_operands;
|
||
|
||
/* Peephole optimizations get insn codes just like insn patterns.
|
||
Count them so we know the code of the define_peephole we are handling. */
|
||
|
||
static int insn_code_number = 0;
|
||
|
||
static void gen_peephole (rtx);
|
||
static void match_rtx (rtx, struct link *, int);
|
||
static void print_path (struct link *);
|
||
static void print_code (RTX_CODE);
|
||
|
||
static void
|
||
gen_peephole (rtx peep)
|
||
{
|
||
int ninsns = XVECLEN (peep, 0);
|
||
int i;
|
||
|
||
n_operands = 0;
|
||
|
||
printf (" insn = ins1;\n");
|
||
|
||
for (i = 0; i < ninsns; i++)
|
||
{
|
||
if (i > 0)
|
||
{
|
||
printf (" do { insn = NEXT_INSN (insn);\n");
|
||
printf (" if (insn == 0) goto L%d; }\n",
|
||
insn_code_number);
|
||
printf (" while (NOTE_P (insn)\n");
|
||
printf ("\t || (NONJUMP_INSN_P (insn)\n");
|
||
printf ("\t && (GET_CODE (PATTERN (insn)) == USE\n");
|
||
printf ("\t\t || GET_CODE (PATTERN (insn)) == CLOBBER)));\n");
|
||
|
||
printf (" if (LABEL_P (insn)\n\
|
||
|| BARRIER_P (insn))\n goto L%d;\n",
|
||
insn_code_number);
|
||
}
|
||
|
||
printf (" pat = PATTERN (insn);\n");
|
||
|
||
/* Walk the insn's pattern, remembering at all times the path
|
||
down to the walking point. */
|
||
|
||
match_rtx (XVECEXP (peep, 0, i), NULL, insn_code_number);
|
||
}
|
||
|
||
/* We get this far if the pattern matches.
|
||
Now test the extra condition. */
|
||
|
||
if (XSTR (peep, 1) && XSTR (peep, 1)[0])
|
||
printf (" if (! (%s)) goto L%d;\n",
|
||
XSTR (peep, 1), insn_code_number);
|
||
|
||
/* If that matches, construct new pattern and put it in the first insn.
|
||
This new pattern will never be matched.
|
||
It exists only so that insn-extract can get the operands back.
|
||
So use a simple regular form: a PARALLEL containing a vector
|
||
of all the operands. */
|
||
|
||
printf (" PATTERN (ins1) = gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (%d, operands));\n", n_operands);
|
||
|
||
/* Record this define_peephole's insn code in the insn,
|
||
as if it had been recognized to match this. */
|
||
printf (" INSN_CODE (ins1) = %d;\n",
|
||
insn_code_number);
|
||
|
||
/* Delete the remaining insns. */
|
||
if (ninsns > 1)
|
||
printf (" delete_for_peephole (NEXT_INSN (ins1), insn);\n");
|
||
|
||
/* See reload1.c for insertion of NOTE which guarantees that this
|
||
cannot be zero. */
|
||
printf (" return NEXT_INSN (insn);\n");
|
||
|
||
printf (" L%d:\n\n", insn_code_number);
|
||
}
|
||
|
||
static void
|
||
match_rtx (rtx x, struct link *path, int fail_label)
|
||
{
|
||
RTX_CODE code;
|
||
int i;
|
||
int len;
|
||
const char *fmt;
|
||
struct link link;
|
||
|
||
if (x == 0)
|
||
return;
|
||
|
||
|
||
code = GET_CODE (x);
|
||
|
||
switch (code)
|
||
{
|
||
case MATCH_OPERAND:
|
||
if (XINT (x, 0) > max_opno)
|
||
max_opno = XINT (x, 0);
|
||
if (XINT (x, 0) >= n_operands)
|
||
n_operands = 1 + XINT (x, 0);
|
||
|
||
printf (" x = ");
|
||
print_path (path);
|
||
printf (";\n");
|
||
|
||
printf (" operands[%d] = x;\n", XINT (x, 0));
|
||
if (XSTR (x, 1) && XSTR (x, 1)[0])
|
||
printf (" if (! %s (x, %smode)) goto L%d;\n",
|
||
XSTR (x, 1), GET_MODE_NAME (GET_MODE (x)), fail_label);
|
||
return;
|
||
|
||
case MATCH_DUP:
|
||
case MATCH_PAR_DUP:
|
||
printf (" x = ");
|
||
print_path (path);
|
||
printf (";\n");
|
||
|
||
printf (" if (!rtx_equal_p (operands[%d], x)) goto L%d;\n",
|
||
XINT (x, 0), fail_label);
|
||
return;
|
||
|
||
case MATCH_OP_DUP:
|
||
printf (" x = ");
|
||
print_path (path);
|
||
printf (";\n");
|
||
|
||
printf (" if (GET_CODE (operands[%d]) != GET_CODE (x)\n", XINT (x, 0));
|
||
printf (" || GET_MODE (operands[%d]) != GET_MODE (x)) goto L%d;\n",
|
||
XINT (x, 0), fail_label);
|
||
printf (" operands[%d] = x;\n", XINT (x, 0));
|
||
link.next = path;
|
||
link.vecelt = -1;
|
||
for (i = 0; i < XVECLEN (x, 1); i++)
|
||
{
|
||
link.pos = i;
|
||
match_rtx (XVECEXP (x, 1, i), &link, fail_label);
|
||
}
|
||
return;
|
||
|
||
case MATCH_OPERATOR:
|
||
if (XINT (x, 0) > max_opno)
|
||
max_opno = XINT (x, 0);
|
||
if (XINT (x, 0) >= n_operands)
|
||
n_operands = 1 + XINT (x, 0);
|
||
|
||
printf (" x = ");
|
||
print_path (path);
|
||
printf (";\n");
|
||
|
||
printf (" operands[%d] = x;\n", XINT (x, 0));
|
||
if (XSTR (x, 1) && XSTR (x, 1)[0])
|
||
printf (" if (! %s (x, %smode)) goto L%d;\n",
|
||
XSTR (x, 1), GET_MODE_NAME (GET_MODE (x)), fail_label);
|
||
link.next = path;
|
||
link.vecelt = -1;
|
||
for (i = 0; i < XVECLEN (x, 2); i++)
|
||
{
|
||
link.pos = i;
|
||
match_rtx (XVECEXP (x, 2, i), &link, fail_label);
|
||
}
|
||
return;
|
||
|
||
case MATCH_PARALLEL:
|
||
if (XINT (x, 0) > max_opno)
|
||
max_opno = XINT (x, 0);
|
||
if (XINT (x, 0) >= n_operands)
|
||
n_operands = 1 + XINT (x, 0);
|
||
|
||
printf (" x = ");
|
||
print_path (path);
|
||
printf (";\n");
|
||
|
||
printf (" if (GET_CODE (x) != PARALLEL) goto L%d;\n", fail_label);
|
||
printf (" operands[%d] = x;\n", XINT (x, 0));
|
||
if (XSTR (x, 1) && XSTR (x, 1)[0])
|
||
printf (" if (! %s (x, %smode)) goto L%d;\n",
|
||
XSTR (x, 1), GET_MODE_NAME (GET_MODE (x)), fail_label);
|
||
link.next = path;
|
||
link.pos = 0;
|
||
for (i = 0; i < XVECLEN (x, 2); i++)
|
||
{
|
||
link.vecelt = i;
|
||
match_rtx (XVECEXP (x, 2, i), &link, fail_label);
|
||
}
|
||
return;
|
||
|
||
case ADDRESS:
|
||
match_rtx (XEXP (x, 0), path, fail_label);
|
||
return;
|
||
|
||
default:
|
||
break;
|
||
}
|
||
|
||
printf (" x = ");
|
||
print_path (path);
|
||
printf (";\n");
|
||
|
||
printf (" if (GET_CODE (x) != ");
|
||
print_code (code);
|
||
printf (") goto L%d;\n", fail_label);
|
||
|
||
if (GET_MODE (x) != VOIDmode)
|
||
{
|
||
printf (" if (GET_MODE (x) != %smode) goto L%d;\n",
|
||
GET_MODE_NAME (GET_MODE (x)), fail_label);
|
||
}
|
||
|
||
link.next = path;
|
||
link.vecelt = -1;
|
||
fmt = GET_RTX_FORMAT (code);
|
||
len = GET_RTX_LENGTH (code);
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
link.pos = i;
|
||
if (fmt[i] == 'e' || fmt[i] == 'u')
|
||
match_rtx (XEXP (x, i), &link, fail_label);
|
||
else if (fmt[i] == 'E')
|
||
{
|
||
int j;
|
||
printf (" if (XVECLEN (x, %d) != %d) goto L%d;\n",
|
||
i, XVECLEN (x, i), fail_label);
|
||
for (j = 0; j < XVECLEN (x, i); j++)
|
||
{
|
||
link.vecelt = j;
|
||
match_rtx (XVECEXP (x, i, j), &link, fail_label);
|
||
}
|
||
}
|
||
else if (fmt[i] == 'i')
|
||
{
|
||
/* Make sure that at run time `x' is the RTX we want to test. */
|
||
if (i != 0)
|
||
{
|
||
printf (" x = ");
|
||
print_path (path);
|
||
printf (";\n");
|
||
}
|
||
|
||
printf (" if (XINT (x, %d) != %d) goto L%d;\n",
|
||
i, XINT (x, i), fail_label);
|
||
}
|
||
else if (fmt[i] == 'w')
|
||
{
|
||
/* Make sure that at run time `x' is the RTX we want to test. */
|
||
if (i != 0)
|
||
{
|
||
printf (" x = ");
|
||
print_path (path);
|
||
printf (";\n");
|
||
}
|
||
|
||
printf (" if (XWINT (x, %d) != ", i);
|
||
printf (HOST_WIDE_INT_PRINT_DEC, XWINT (x, i));
|
||
printf (") goto L%d;\n", fail_label);
|
||
}
|
||
else if (fmt[i] == 's')
|
||
{
|
||
/* Make sure that at run time `x' is the RTX we want to test. */
|
||
if (i != 0)
|
||
{
|
||
printf (" x = ");
|
||
print_path (path);
|
||
printf (";\n");
|
||
}
|
||
|
||
printf (" if (strcmp (XSTR (x, %d), \"%s\")) goto L%d;\n",
|
||
i, XSTR (x, i), fail_label);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Given a PATH, representing a path down the instruction's
|
||
pattern from the root to a certain point, output code to
|
||
evaluate to the rtx at that point. */
|
||
|
||
static void
|
||
print_path (struct link *path)
|
||
{
|
||
if (path == 0)
|
||
printf ("pat");
|
||
else if (path->vecelt >= 0)
|
||
{
|
||
printf ("XVECEXP (");
|
||
print_path (path->next);
|
||
printf (", %d, %d)", path->pos, path->vecelt);
|
||
}
|
||
else
|
||
{
|
||
printf ("XEXP (");
|
||
print_path (path->next);
|
||
printf (", %d)", path->pos);
|
||
}
|
||
}
|
||
|
||
static void
|
||
print_code (RTX_CODE code)
|
||
{
|
||
const char *p1;
|
||
for (p1 = GET_RTX_NAME (code); *p1; p1++)
|
||
putchar (TOUPPER(*p1));
|
||
}
|
||
|
||
extern int main (int, char **);
|
||
|
||
int
|
||
main (int argc, char **argv)
|
||
{
|
||
rtx desc;
|
||
|
||
max_opno = -1;
|
||
|
||
progname = "genpeep";
|
||
|
||
if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
|
||
return (FATAL_EXIT_CODE);
|
||
|
||
printf ("/* Generated automatically by the program `genpeep'\n\
|
||
from the machine description file `md'. */\n\n");
|
||
|
||
printf ("#include \"config.h\"\n");
|
||
printf ("#include \"system.h\"\n");
|
||
printf ("#include \"coretypes.h\"\n");
|
||
printf ("#include \"tm.h\"\n");
|
||
printf ("#include \"insn-config.h\"\n");
|
||
printf ("#include \"rtl.h\"\n");
|
||
printf ("#include \"tm_p.h\"\n");
|
||
printf ("#include \"regs.h\"\n");
|
||
printf ("#include \"output.h\"\n");
|
||
printf ("#include \"real.h\"\n");
|
||
printf ("#include \"recog.h\"\n");
|
||
printf ("#include \"except.h\"\n");
|
||
printf ("#include \"function.h\"\n");
|
||
printf ("#include \"toplev.h\"\n");
|
||
printf ("#include \"flags.h\"\n");
|
||
printf ("#include \"tm-constrs.h\"\n\n");
|
||
|
||
printf ("#ifdef HAVE_peephole\n");
|
||
printf ("extern rtx peep_operand[];\n\n");
|
||
printf ("#define operands peep_operand\n\n");
|
||
|
||
printf ("rtx\npeephole (rtx ins1)\n{\n");
|
||
printf (" rtx insn ATTRIBUTE_UNUSED, x ATTRIBUTE_UNUSED, pat ATTRIBUTE_UNUSED;\n\n");
|
||
|
||
/* Early out: no peepholes for insns followed by barriers. */
|
||
printf (" if (NEXT_INSN (ins1)\n");
|
||
printf (" && BARRIER_P (NEXT_INSN (ins1)))\n");
|
||
printf (" return 0;\n\n");
|
||
|
||
/* Read the machine description. */
|
||
|
||
while (1)
|
||
{
|
||
int line_no, rtx_number = 0;
|
||
|
||
desc = read_md_rtx (&line_no, &rtx_number);
|
||
if (desc == NULL)
|
||
break;
|
||
|
||
if (GET_CODE (desc) == DEFINE_PEEPHOLE)
|
||
{
|
||
gen_peephole (desc);
|
||
insn_code_number++;
|
||
}
|
||
if (GET_CODE (desc) == DEFINE_INSN
|
||
|| GET_CODE (desc) == DEFINE_EXPAND
|
||
|| GET_CODE (desc) == DEFINE_SPLIT
|
||
|| GET_CODE (desc) == DEFINE_PEEPHOLE2)
|
||
{
|
||
insn_code_number++;
|
||
}
|
||
}
|
||
|
||
printf (" return 0;\n}\n\n");
|
||
|
||
if (max_opno == -1)
|
||
max_opno = 1;
|
||
|
||
printf ("rtx peep_operand[%d];\n", max_opno + 1);
|
||
printf ("#endif\n");
|
||
|
||
fflush (stdout);
|
||
return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
|
||
}
|