1 /* Generate code from machine description to perform peephole optimizations.
2 Copyright (C) 1987-2018 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
27 #include "gensupport.h"
30 /* While tree-walking an instruction pattern, we keep a chain
31 of these `struct link's to record how to get down to the
32 current position. In each one, POS is the operand number,
33 and if the operand is a vector VEC is the element number.
34 VEC is -1 if the operand is not a vector. */
45 /* Number of operands used in current peephole definition. */
47 static int n_operands
;
49 static void match_rtx (rtx
, struct link
*, int);
50 static void print_path (struct link
*);
51 static void print_code (RTX_CODE
);
54 gen_peephole (md_rtx_info
*info
)
57 int ninsns
= XVECLEN (peep
, 0);
62 printf (" insn = ins1;\n");
64 for (i
= 0; i
< ninsns
; i
++)
68 printf (" do { insn = NEXT_INSN (insn);\n");
69 printf (" if (insn == 0) goto L%d; }\n", info
->index
);
70 printf (" while (NOTE_P (insn)\n");
71 printf ("\t || (NONJUMP_INSN_P (insn)\n");
72 printf ("\t && (GET_CODE (PATTERN (insn)) == USE\n");
73 printf ("\t\t || GET_CODE (PATTERN (insn)) == CLOBBER)));\n");
75 printf (" if (LABEL_P (insn)\n\
76 || BARRIER_P (insn))\n goto L%d;\n", info
->index
);
79 printf (" pat = PATTERN (insn);\n");
81 /* Walk the insn's pattern, remembering at all times the path
82 down to the walking point. */
84 match_rtx (XVECEXP (peep
, 0, i
), NULL
, info
->index
);
87 /* We get this far if the pattern matches.
88 Now test the extra condition. */
90 if (XSTR (peep
, 1) && XSTR (peep
, 1)[0])
91 printf (" if (! (%s)) goto L%d;\n",
92 XSTR (peep
, 1), info
->index
);
94 /* If that matches, construct new pattern and put it in the first insn.
95 This new pattern will never be matched.
96 It exists only so that insn-extract can get the operands back.
97 So use a simple regular form: a PARALLEL containing a vector
98 of all the operands. */
100 printf (" PATTERN (ins1) = gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (%d, operands));\n", n_operands
);
102 /* Record this define_peephole's insn code in the insn,
103 as if it had been recognized to match this. */
104 printf (" INSN_CODE (ins1) = %d;\n", info
->index
);
106 /* Delete the remaining insns. */
108 printf (" delete_for_peephole (NEXT_INSN (ins1), insn);\n");
110 /* See reload1.c for insertion of NOTE which guarantees that this
112 printf (" return NEXT_INSN (insn);\n");
114 printf (" L%d:\n\n", info
->index
);
118 match_rtx (rtx x
, struct link
*path
, int fail_label
)
135 if (XINT (x
, 0) > max_opno
)
136 max_opno
= XINT (x
, 0);
137 if (XINT (x
, 0) >= n_operands
)
138 n_operands
= 1 + XINT (x
, 0);
144 printf (" operands[%d] = x;\n", XINT (x
, 0));
145 if (XSTR (x
, 1) && XSTR (x
, 1)[0])
146 printf (" if (! %s (x, %smode)) goto L%d;\n",
147 XSTR (x
, 1), GET_MODE_NAME (GET_MODE (x
)), fail_label
);
156 printf (" if (!rtx_equal_p (operands[%d], x)) goto L%d;\n",
157 XINT (x
, 0), fail_label
);
165 printf (" if (GET_CODE (operands[%d]) != GET_CODE (x)\n", XINT (x
, 0));
166 printf (" || GET_MODE (operands[%d]) != GET_MODE (x)) goto L%d;\n",
167 XINT (x
, 0), fail_label
);
168 printf (" operands[%d] = x;\n", XINT (x
, 0));
171 for (i
= 0; i
< XVECLEN (x
, 1); i
++)
174 match_rtx (XVECEXP (x
, 1, i
), &link
, fail_label
);
179 if (XINT (x
, 0) > max_opno
)
180 max_opno
= XINT (x
, 0);
181 if (XINT (x
, 0) >= n_operands
)
182 n_operands
= 1 + XINT (x
, 0);
188 printf (" operands[%d] = x;\n", XINT (x
, 0));
189 if (XSTR (x
, 1) && XSTR (x
, 1)[0])
190 printf (" if (! %s (x, %smode)) goto L%d;\n",
191 XSTR (x
, 1), GET_MODE_NAME (GET_MODE (x
)), fail_label
);
194 for (i
= 0; i
< XVECLEN (x
, 2); i
++)
197 match_rtx (XVECEXP (x
, 2, i
), &link
, fail_label
);
202 if (XINT (x
, 0) > max_opno
)
203 max_opno
= XINT (x
, 0);
204 if (XINT (x
, 0) >= n_operands
)
205 n_operands
= 1 + XINT (x
, 0);
211 printf (" if (GET_CODE (x) != PARALLEL) goto L%d;\n", fail_label
);
212 printf (" operands[%d] = x;\n", XINT (x
, 0));
213 if (XSTR (x
, 1) && XSTR (x
, 1)[0])
214 printf (" if (! %s (x, %smode)) goto L%d;\n",
215 XSTR (x
, 1), GET_MODE_NAME (GET_MODE (x
)), fail_label
);
218 for (i
= 0; i
< XVECLEN (x
, 2); i
++)
221 match_rtx (XVECEXP (x
, 2, i
), &link
, fail_label
);
233 printf (" if (GET_CODE (x) != ");
235 printf (") goto L%d;\n", fail_label
);
237 if (GET_MODE (x
) != VOIDmode
)
239 printf (" if (GET_MODE (x) != %smode) goto L%d;\n",
240 GET_MODE_NAME (GET_MODE (x
)), fail_label
);
245 fmt
= GET_RTX_FORMAT (code
);
246 len
= GET_RTX_LENGTH (code
);
247 for (i
= 0; i
< len
; i
++)
250 if (fmt
[i
] == 'e' || fmt
[i
] == 'u')
251 match_rtx (XEXP (x
, i
), &link
, fail_label
);
252 else if (fmt
[i
] == 'E')
255 printf (" if (XVECLEN (x, %d) != %d) goto L%d;\n",
256 i
, XVECLEN (x
, i
), fail_label
);
257 for (j
= 0; j
< XVECLEN (x
, i
); j
++)
260 match_rtx (XVECEXP (x
, i
, j
), &link
, fail_label
);
263 else if (fmt
[i
] == 'i')
265 /* Make sure that at run time `x' is the RTX we want to test. */
273 printf (" if (XINT (x, %d) != %d) goto L%d;\n",
274 i
, XINT (x
, i
), fail_label
);
276 else if (fmt
[i
] == 'r')
279 printf (" if (REGNO (x) != %d) goto L%d;\n",
280 REGNO (x
), fail_label
);
282 else if (fmt
[i
] == 'w')
284 /* Make sure that at run time `x' is the RTX we want to test. */
292 printf (" if (XWINT (x, %d) != ", i
);
293 printf (HOST_WIDE_INT_PRINT_DEC
, XWINT (x
, i
));
294 printf (") goto L%d;\n", fail_label
);
296 else if (fmt
[i
] == 's')
298 /* Make sure that at run time `x' is the RTX we want to test. */
306 printf (" if (strcmp (XSTR (x, %d), \"%s\")) goto L%d;\n",
307 i
, XSTR (x
, i
), fail_label
);
309 else if (fmt
[i
] == 'p')
310 /* Not going to support subregs for legacy define_peeholes. */
315 /* Given a PATH, representing a path down the instruction's
316 pattern from the root to a certain point, output code to
317 evaluate to the rtx at that point. */
320 print_path (struct link
*path
)
324 else if (path
->vecelt
>= 0)
326 printf ("XVECEXP (");
327 print_path (path
->next
);
328 printf (", %d, %d)", path
->pos
, path
->vecelt
);
333 print_path (path
->next
);
334 printf (", %d)", path
->pos
);
339 print_code (RTX_CODE code
)
342 for (p1
= GET_RTX_NAME (code
); *p1
; p1
++)
343 putchar (TOUPPER (*p1
));
346 extern int main (int, const char **);
349 main (int argc
, const char **argv
)
353 progname
= "genpeep";
355 if (!init_rtx_reader_args (argc
, argv
))
356 return (FATAL_EXIT_CODE
);
358 printf ("/* Generated automatically by the program `genpeep'\n\
359 from the machine description file `md'. */\n\n");
361 printf ("#define IN_TARGET_CODE 1\n");
362 printf ("#include \"config.h\"\n");
363 printf ("#include \"system.h\"\n");
364 printf ("#include \"coretypes.h\"\n");
365 printf ("#include \"backend.h\"\n");
366 printf ("#include \"tree.h\"\n");
367 printf ("#include \"rtl.h\"\n");
368 printf ("#include \"insn-config.h\"\n");
369 printf ("#include \"alias.h\"\n");
370 printf ("#include \"varasm.h\"\n");
371 printf ("#include \"stor-layout.h\"\n");
372 printf ("#include \"calls.h\"\n");
373 printf ("#include \"memmodel.h\"\n");
374 printf ("#include \"tm_p.h\"\n");
375 printf ("#include \"regs.h\"\n");
376 printf ("#include \"output.h\"\n");
377 printf ("#include \"recog.h\"\n");
378 printf ("#include \"except.h\"\n");
379 printf ("#include \"diagnostic-core.h\"\n");
380 printf ("#include \"flags.h\"\n");
381 printf ("#include \"tm-constrs.h\"\n\n");
383 printf ("extern rtx peep_operand[];\n\n");
384 printf ("#define operands peep_operand\n\n");
386 printf ("rtx_insn *\npeephole (rtx_insn *ins1)\n{\n");
387 printf (" rtx_insn *insn ATTRIBUTE_UNUSED;\n");
388 printf (" rtx x ATTRIBUTE_UNUSED, pat ATTRIBUTE_UNUSED;\n\n");
390 /* Early out: no peepholes for insns followed by barriers. */
391 printf (" if (NEXT_INSN (ins1)\n");
392 printf (" && BARRIER_P (NEXT_INSN (ins1)))\n");
393 printf (" return 0;\n\n");
395 /* Read the machine description. */
398 while (read_md_rtx (&info
))
399 switch (GET_CODE (info
.def
))
401 case DEFINE_PEEPHOLE
:
402 gen_peephole (&info
);
409 printf (" return 0;\n}\n\n");
414 printf ("rtx peep_operand[%d];\n", max_opno
+ 1);
417 return (ferror (stdout
) != 0 ? FATAL_EXIT_CODE
: SUCCESS_EXIT_CODE
);