aboutsummaryrefslogtreecommitdiff
path: root/gcc/genpeep.c
blob: 80ce3f120cdf0d7a93a87acb8b77c1478997cd9f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
/* 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 \"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);
}