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/* Generate code from machine description to perform peephole optimizations.
Copyright (C) 1987-2019 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 "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;
static void match_rtx (rtx, struct link *, int);
static void print_path (struct link *);
static void print_code (RTX_CODE);
static void
gen_peephole (md_rtx_info *info)
{
rtx peep = info->def;
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", info->index);
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", info->index);
}
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, info->index);
}
/* 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), info->index);
/* 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", info->index);
/* 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", info->index);
}
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;
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] == 'r')
{
gcc_assert (i == 0);
printf (" if (REGNO (x) != %d) goto L%d;\n",
REGNO (x), 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);
}
else if (fmt[i] == 'p')
/* Not going to support subregs for legacy define_peeholes. */
gcc_unreachable ();
}
}
/* 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, const char **);
int
main (int argc, const char **argv)
{
max_opno = -1;
progname = "genpeep";
if (!init_rtx_reader_args (argc, argv))
return (FATAL_EXIT_CODE);
printf ("/* Generated automatically by the program `genpeep'\n\
from the machine description file `md'. */\n\n");
printf ("#define IN_TARGET_CODE 1\n");
printf ("#include \"config.h\"\n");
printf ("#include \"system.h\"\n");
printf ("#include \"coretypes.h\"\n");
printf ("#include \"backend.h\"\n");
printf ("#include \"tree.h\"\n");
printf ("#include \"rtl.h\"\n");
printf ("#include \"insn-config.h\"\n");
printf ("#include \"alias.h\"\n");
printf ("#include \"varasm.h\"\n");
printf ("#include \"stor-layout.h\"\n");
printf ("#include \"calls.h\"\n");
printf ("#include \"memmodel.h\"\n");
printf ("#include \"tm_p.h\"\n");
printf ("#include \"regs.h\"\n");
printf ("#include \"output.h\"\n");
printf ("#include \"recog.h\"\n");
printf ("#include \"except.h\"\n");
printf ("#include \"diagnostic-core.h\"\n");
printf ("#include \"flags.h\"\n");
printf ("#include \"tm-constrs.h\"\n\n");
printf ("extern rtx peep_operand[];\n\n");
printf ("#define operands peep_operand\n\n");
printf ("rtx_insn *\npeephole (rtx_insn *ins1)\n{\n");
printf (" rtx_insn *insn ATTRIBUTE_UNUSED;\n");
printf (" rtx 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. */
md_rtx_info info;
while (read_md_rtx (&info))
switch (GET_CODE (info.def))
{
case DEFINE_PEEPHOLE:
gen_peephole (&info);
break;
default:
break;
}
printf (" return 0;\n}\n\n");
if (max_opno == -1)
max_opno = 1;
printf ("rtx peep_operand[%d];\n", max_opno + 1);
fflush (stdout);
return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
}