diff options
Diffstat (limited to 'gcc-4.2.1-5666.3/gcc/genpeep.c')
| -rw-r--r-- | gcc-4.2.1-5666.3/gcc/genpeep.c | 431 |
1 files changed, 431 insertions, 0 deletions
diff --git a/gcc-4.2.1-5666.3/gcc/genpeep.c b/gcc-4.2.1-5666.3/gcc/genpeep.c new file mode 100644 index 000000000..c5a7fc292 --- /dev/null +++ b/gcc-4.2.1-5666.3/gcc/genpeep.c @@ -0,0 +1,431 @@ +/* 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); +} |