419 lines
11 KiB
C
419 lines
11 KiB
C
/* Generate code from machine description to perform peephole optimizations.
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Copyright (C) 1987-2020 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "bconfig.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "rtl.h"
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#include "errors.h"
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#include "gensupport.h"
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/* While tree-walking an instruction pattern, we keep a chain
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of these `struct link's to record how to get down to the
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current position. In each one, POS is the operand number,
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and if the operand is a vector VEC is the element number.
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VEC is -1 if the operand is not a vector. */
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struct link
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{
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struct link *next;
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int pos;
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int vecelt;
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};
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static int max_opno;
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/* Number of operands used in current peephole definition. */
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static int n_operands;
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static void match_rtx (rtx, struct link *, int);
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static void print_path (struct link *);
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static void print_code (RTX_CODE);
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static void
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gen_peephole (md_rtx_info *info)
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{
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rtx peep = info->def;
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int ninsns = XVECLEN (peep, 0);
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int i;
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n_operands = 0;
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printf (" insn = ins1;\n");
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for (i = 0; i < ninsns; i++)
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{
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if (i > 0)
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{
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printf (" do { insn = NEXT_INSN (insn);\n");
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printf (" if (insn == 0) goto L%d; }\n", info->index);
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printf (" while (NOTE_P (insn)\n");
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printf ("\t || (NONJUMP_INSN_P (insn)\n");
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printf ("\t && (GET_CODE (PATTERN (insn)) == USE\n");
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printf ("\t\t || GET_CODE (PATTERN (insn)) == CLOBBER)));\n");
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printf (" if (LABEL_P (insn)\n\
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|| BARRIER_P (insn))\n goto L%d;\n", info->index);
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}
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printf (" pat = PATTERN (insn);\n");
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/* Walk the insn's pattern, remembering at all times the path
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down to the walking point. */
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match_rtx (XVECEXP (peep, 0, i), NULL, info->index);
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}
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/* We get this far if the pattern matches.
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Now test the extra condition. */
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if (XSTR (peep, 1) && XSTR (peep, 1)[0])
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printf (" if (! (%s)) goto L%d;\n",
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XSTR (peep, 1), info->index);
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/* If that matches, construct new pattern and put it in the first insn.
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This new pattern will never be matched.
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It exists only so that insn-extract can get the operands back.
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So use a simple regular form: a PARALLEL containing a vector
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of all the operands. */
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printf (" PATTERN (ins1) = gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (%d, operands));\n", n_operands);
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/* Record this define_peephole's insn code in the insn,
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as if it had been recognized to match this. */
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printf (" INSN_CODE (ins1) = %d;\n", info->index);
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/* Delete the remaining insns. */
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if (ninsns > 1)
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printf (" delete_for_peephole (NEXT_INSN (ins1), insn);\n");
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/* See reload1.c for insertion of NOTE which guarantees that this
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cannot be zero. */
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printf (" return NEXT_INSN (insn);\n");
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printf (" L%d:\n\n", info->index);
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}
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static void
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match_rtx (rtx x, struct link *path, int fail_label)
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{
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RTX_CODE code;
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int i;
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int len;
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const char *fmt;
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struct link link;
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if (x == 0)
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return;
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code = GET_CODE (x);
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switch (code)
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{
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case MATCH_OPERAND:
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if (XINT (x, 0) > max_opno)
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max_opno = XINT (x, 0);
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if (XINT (x, 0) >= n_operands)
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n_operands = 1 + XINT (x, 0);
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printf (" x = ");
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print_path (path);
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printf (";\n");
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printf (" operands[%d] = x;\n", XINT (x, 0));
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if (XSTR (x, 1) && XSTR (x, 1)[0])
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printf (" if (! %s (x, %smode)) goto L%d;\n",
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XSTR (x, 1), GET_MODE_NAME (GET_MODE (x)), fail_label);
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return;
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case MATCH_DUP:
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case MATCH_PAR_DUP:
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printf (" x = ");
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print_path (path);
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printf (";\n");
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printf (" if (!rtx_equal_p (operands[%d], x)) goto L%d;\n",
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XINT (x, 0), fail_label);
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return;
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case MATCH_OP_DUP:
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printf (" x = ");
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print_path (path);
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printf (";\n");
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printf (" if (GET_CODE (operands[%d]) != GET_CODE (x)\n", XINT (x, 0));
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printf (" || GET_MODE (operands[%d]) != GET_MODE (x)) goto L%d;\n",
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XINT (x, 0), fail_label);
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printf (" operands[%d] = x;\n", XINT (x, 0));
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link.next = path;
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link.vecelt = -1;
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for (i = 0; i < XVECLEN (x, 1); i++)
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{
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link.pos = i;
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match_rtx (XVECEXP (x, 1, i), &link, fail_label);
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}
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return;
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case MATCH_OPERATOR:
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if (XINT (x, 0) > max_opno)
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max_opno = XINT (x, 0);
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if (XINT (x, 0) >= n_operands)
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n_operands = 1 + XINT (x, 0);
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printf (" x = ");
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print_path (path);
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printf (";\n");
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printf (" operands[%d] = x;\n", XINT (x, 0));
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if (XSTR (x, 1) && XSTR (x, 1)[0])
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printf (" if (! %s (x, %smode)) goto L%d;\n",
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XSTR (x, 1), GET_MODE_NAME (GET_MODE (x)), fail_label);
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link.next = path;
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link.vecelt = -1;
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for (i = 0; i < XVECLEN (x, 2); i++)
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{
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link.pos = i;
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match_rtx (XVECEXP (x, 2, i), &link, fail_label);
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}
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return;
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case MATCH_PARALLEL:
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if (XINT (x, 0) > max_opno)
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max_opno = XINT (x, 0);
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if (XINT (x, 0) >= n_operands)
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n_operands = 1 + XINT (x, 0);
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printf (" x = ");
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print_path (path);
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printf (";\n");
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printf (" if (GET_CODE (x) != PARALLEL) goto L%d;\n", fail_label);
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printf (" operands[%d] = x;\n", XINT (x, 0));
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if (XSTR (x, 1) && XSTR (x, 1)[0])
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printf (" if (! %s (x, %smode)) goto L%d;\n",
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XSTR (x, 1), GET_MODE_NAME (GET_MODE (x)), fail_label);
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link.next = path;
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link.pos = 0;
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for (i = 0; i < XVECLEN (x, 2); i++)
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{
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link.vecelt = i;
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match_rtx (XVECEXP (x, 2, i), &link, fail_label);
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}
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return;
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default:
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break;
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}
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printf (" x = ");
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print_path (path);
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printf (";\n");
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printf (" if (GET_CODE (x) != ");
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print_code (code);
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printf (") goto L%d;\n", fail_label);
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if (GET_MODE (x) != VOIDmode)
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{
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printf (" if (GET_MODE (x) != %smode) goto L%d;\n",
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GET_MODE_NAME (GET_MODE (x)), fail_label);
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}
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link.next = path;
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link.vecelt = -1;
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fmt = GET_RTX_FORMAT (code);
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len = GET_RTX_LENGTH (code);
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for (i = 0; i < len; i++)
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{
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link.pos = i;
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if (fmt[i] == 'e' || fmt[i] == 'u')
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match_rtx (XEXP (x, i), &link, fail_label);
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else if (fmt[i] == 'E')
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{
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int j;
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printf (" if (XVECLEN (x, %d) != %d) goto L%d;\n",
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i, XVECLEN (x, i), fail_label);
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for (j = 0; j < XVECLEN (x, i); j++)
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{
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link.vecelt = j;
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match_rtx (XVECEXP (x, i, j), &link, fail_label);
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}
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}
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else if (fmt[i] == 'i')
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{
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/* Make sure that at run time `x' is the RTX we want to test. */
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if (i != 0)
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{
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printf (" x = ");
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print_path (path);
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printf (";\n");
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}
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printf (" if (XINT (x, %d) != %d) goto L%d;\n",
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i, XINT (x, i), fail_label);
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}
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else if (fmt[i] == 'r')
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{
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gcc_assert (i == 0);
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printf (" if (REGNO (x) != %d) goto L%d;\n",
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REGNO (x), fail_label);
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}
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else if (fmt[i] == 'w')
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{
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/* Make sure that at run time `x' is the RTX we want to test. */
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if (i != 0)
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{
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printf (" x = ");
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print_path (path);
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printf (";\n");
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}
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printf (" if (XWINT (x, %d) != ", i);
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printf (HOST_WIDE_INT_PRINT_DEC, XWINT (x, i));
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printf (") goto L%d;\n", fail_label);
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}
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else if (fmt[i] == 's')
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{
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/* Make sure that at run time `x' is the RTX we want to test. */
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if (i != 0)
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{
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printf (" x = ");
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print_path (path);
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printf (";\n");
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}
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printf (" if (strcmp (XSTR (x, %d), \"%s\")) goto L%d;\n",
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i, XSTR (x, i), fail_label);
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}
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else if (fmt[i] == 'p')
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/* Not going to support subregs for legacy define_peeholes. */
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gcc_unreachable ();
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}
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}
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/* Given a PATH, representing a path down the instruction's
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pattern from the root to a certain point, output code to
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evaluate to the rtx at that point. */
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static void
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print_path (struct link *path)
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{
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if (path == 0)
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printf ("pat");
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else if (path->vecelt >= 0)
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{
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printf ("XVECEXP (");
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print_path (path->next);
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printf (", %d, %d)", path->pos, path->vecelt);
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}
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else
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{
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printf ("XEXP (");
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print_path (path->next);
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printf (", %d)", path->pos);
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}
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}
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static void
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print_code (RTX_CODE code)
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{
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const char *p1;
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for (p1 = GET_RTX_NAME (code); *p1; p1++)
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putchar (TOUPPER (*p1));
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}
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extern int main (int, const char **);
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int
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main (int argc, const char **argv)
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{
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max_opno = -1;
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progname = "genpeep";
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if (!init_rtx_reader_args (argc, argv))
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return (FATAL_EXIT_CODE);
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printf ("/* Generated automatically by the program `genpeep'\n\
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from the machine description file `md'. */\n\n");
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printf ("#define IN_TARGET_CODE 1\n");
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printf ("#include \"config.h\"\n");
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printf ("#include \"system.h\"\n");
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printf ("#include \"coretypes.h\"\n");
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printf ("#include \"backend.h\"\n");
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printf ("#include \"tree.h\"\n");
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printf ("#include \"rtl.h\"\n");
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printf ("#include \"insn-config.h\"\n");
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printf ("#include \"alias.h\"\n");
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printf ("#include \"varasm.h\"\n");
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printf ("#include \"stor-layout.h\"\n");
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printf ("#include \"calls.h\"\n");
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printf ("#include \"memmodel.h\"\n");
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printf ("#include \"tm_p.h\"\n");
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printf ("#include \"regs.h\"\n");
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printf ("#include \"output.h\"\n");
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printf ("#include \"recog.h\"\n");
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printf ("#include \"except.h\"\n");
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printf ("#include \"diagnostic-core.h\"\n");
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printf ("#include \"flags.h\"\n");
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printf ("#include \"tm-constrs.h\"\n\n");
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printf ("extern rtx peep_operand[];\n\n");
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printf ("#define operands peep_operand\n\n");
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printf ("rtx_insn *\npeephole (rtx_insn *ins1)\n{\n");
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printf (" rtx_insn *insn ATTRIBUTE_UNUSED;\n");
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printf (" rtx x ATTRIBUTE_UNUSED, pat ATTRIBUTE_UNUSED;\n\n");
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/* Early out: no peepholes for insns followed by barriers. */
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printf (" if (NEXT_INSN (ins1)\n");
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printf (" && BARRIER_P (NEXT_INSN (ins1)))\n");
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printf (" return 0;\n\n");
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/* Read the machine description. */
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md_rtx_info info;
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while (read_md_rtx (&info))
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switch (GET_CODE (info.def))
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{
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case DEFINE_PEEPHOLE:
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gen_peephole (&info);
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break;
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default:
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break;
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}
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printf (" return 0;\n}\n\n");
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if (max_opno == -1)
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max_opno = 1;
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printf ("rtx peep_operand[%d];\n", max_opno + 1);
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fflush (stdout);
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return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
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}
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