freebsd-dev/contrib/gcc/genpeep.c

439 lines
11 KiB
C
Raw Normal View History

/* Generate code from machine description to perform peephole optimizations.
Copyright (C) 1987, 1989, 1992, 1997, 1998,
2004-07-28 03:11:36 +00:00
1999, 2000, 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. */
2004-07-28 03:11:36 +00:00
#include "bconfig.h"
1999-08-26 09:30:50 +00:00
#include "system.h"
2004-07-28 03:11:36 +00:00
#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;
2004-07-28 03:11:36 +00:00
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
2004-07-28 03:11:36 +00:00
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 (GET_CODE (insn) == NOTE\n");
printf ("\t || (GET_CODE (insn) == INSN\n");
printf ("\t && (GET_CODE (PATTERN (insn)) == USE\n");
printf ("\t\t || GET_CODE (PATTERN (insn)) == CLOBBER)));\n");
printf (" if (GET_CODE (insn) == CODE_LABEL\n\
|| GET_CODE (insn) == BARRIER)\n goto L%d;\n",
2004-07-28 03:11:36 +00:00
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. */
1999-08-26 09:30:50 +00:00
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
2004-07-28 03:11:36 +00:00
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;
2004-07-28 03:11:36 +00:00
1999-08-26 09:30:50 +00:00
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");
}
1999-08-26 09:30:50 +00:00
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
2004-07-28 03:11:36 +00:00
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
2004-07-28 03:11:36 +00:00
print_code (RTX_CODE code)
{
const char *p1;
for (p1 = GET_RTX_NAME (code); *p1; p1++)
putchar (TOUPPER(*p1));
}
2004-07-28 03:11:36 +00:00
extern int main (int, char **);
int
2004-07-28 03:11:36 +00:00
main (int argc, char **argv)
{
rtx desc;
max_opno = -1;
progname = "genpeep";
if (argc <= 1)
fatal ("no input file name");
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");
1999-08-26 09:30:50 +00:00
printf ("#include \"system.h\"\n");
2004-07-28 03:11:36 +00:00
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");
1999-08-26 09:30:50 +00:00
printf ("#include \"real.h\"\n");
printf ("#include \"recog.h\"\n");
1999-08-26 09:30:50 +00:00
printf ("#include \"except.h\"\n\n");
printf ("#include \"function.h\"\n\n");
printf ("#ifdef HAVE_peephole\n");
printf ("extern rtx peep_operand[];\n\n");
printf ("#define operands peep_operand\n\n");
2004-07-28 03:11:36 +00:00
printf ("rtx\npeephole (rtx ins1)\n{\n");
1999-08-26 09:30:50 +00:00
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 (" && GET_CODE (NEXT_INSN (ins1)) == BARRIER)\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);
}
/* Define this so we can link with print-rtl.o to get debug_rtx function. */
const char *
2004-07-28 03:11:36 +00:00
get_insn_name (int code ATTRIBUTE_UNUSED)
{
return NULL;
}