aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.9/gcc/genconfig.c
blob: cafa8d3040ab8bc036711479871814357dafa802 (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
/* Generate from machine description:
   - some #define configuration flags.
   Copyright (C) 1987-2014 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"


/* flags to determine output of machine description dependent #define's.  */
static int max_recog_operands;  /* Largest operand number seen.  */
static int max_dup_operands;    /* Largest number of match_dup in any insn.  */
static int max_clobbers_per_insn;
static int have_cc0_flag;
static int have_cmove_flag;
static int have_cond_exec_flag;
static int have_lo_sum_flag;
static int have_peephole_flag;
static int have_peephole2_flag;

/* Maximum number of insns seen in a split.  */
static int max_insns_per_split = 1;

/* Maximum number of input insns for peephole2.  */
static int max_insns_per_peep2;

static int clobbers_seen_this_insn;
static int dup_operands_seen_this_insn;

static void walk_insn_part (rtx, int, int);
static void gen_insn (rtx);
static void gen_expand (rtx);
static void gen_split (rtx);
static void gen_peephole (rtx);
static void gen_peephole2 (rtx);

/* RECOG_P will be nonzero if this pattern was seen in a context where it will
   be used to recognize, rather than just generate an insn.

   NON_PC_SET_SRC will be nonzero if this pattern was seen in a SET_SRC
   of a SET whose destination is not (pc).  */

static void
walk_insn_part (rtx part, int recog_p, int non_pc_set_src)
{
  int i, j;
  RTX_CODE code;
  const char *format_ptr;

  if (part == 0)
    return;

  code = GET_CODE (part);
  switch (code)
    {
    case CLOBBER:
      clobbers_seen_this_insn++;
      break;

    case MATCH_OPERAND:
      if (XINT (part, 0) > max_recog_operands)
	max_recog_operands = XINT (part, 0);
      return;

    case MATCH_OP_DUP:
    case MATCH_PAR_DUP:
      ++dup_operands_seen_this_insn;
    case MATCH_SCRATCH:
    case MATCH_PARALLEL:
    case MATCH_OPERATOR:
      if (XINT (part, 0) > max_recog_operands)
	max_recog_operands = XINT (part, 0);
      /* Now scan the rtl's in the vector inside the MATCH_OPERATOR or
	 MATCH_PARALLEL.  */
      break;

    case LABEL_REF:
      if (GET_CODE (XEXP (part, 0)) == MATCH_OPERAND
	  || GET_CODE (XEXP (part, 0)) == MATCH_DUP)
	break;
      return;

    case MATCH_DUP:
      ++dup_operands_seen_this_insn;
      if (XINT (part, 0) > max_recog_operands)
	max_recog_operands = XINT (part, 0);
      return;

    case CC0:
      if (recog_p)
	have_cc0_flag = 1;
      return;

    case LO_SUM:
      if (recog_p)
	have_lo_sum_flag = 1;
      return;

    case SET:
      walk_insn_part (SET_DEST (part), 0, recog_p);
      walk_insn_part (SET_SRC (part), recog_p,
		      GET_CODE (SET_DEST (part)) != PC);
      return;

    case IF_THEN_ELSE:
      /* Only consider this machine as having a conditional move if the
	 two arms of the IF_THEN_ELSE are both MATCH_OPERAND.  Otherwise,
	 we have some specific IF_THEN_ELSE construct (like the doz
	 instruction on the RS/6000) that can't be used in the general
	 context we want it for.  */

      if (recog_p && non_pc_set_src
	  && GET_CODE (XEXP (part, 1)) == MATCH_OPERAND
	  && GET_CODE (XEXP (part, 2)) == MATCH_OPERAND)
	have_cmove_flag = 1;
      break;

    case COND_EXEC:
      if (recog_p)
	have_cond_exec_flag = 1;
      break;

    case REG: case CONST_INT: case SYMBOL_REF:
    case PC:
      return;

    default:
      break;
    }

  format_ptr = GET_RTX_FORMAT (GET_CODE (part));

  for (i = 0; i < GET_RTX_LENGTH (GET_CODE (part)); i++)
    switch (*format_ptr++)
      {
      case 'e':
      case 'u':
	walk_insn_part (XEXP (part, i), recog_p, non_pc_set_src);
	break;
      case 'E':
	if (XVEC (part, i) != NULL)
	  for (j = 0; j < XVECLEN (part, i); j++)
	    walk_insn_part (XVECEXP (part, i, j), recog_p, non_pc_set_src);
	break;
      }
}

static void
gen_insn (rtx insn)
{
  int i;

  /* Walk the insn pattern to gather the #define's status.  */
  clobbers_seen_this_insn = 0;
  dup_operands_seen_this_insn = 0;
  if (XVEC (insn, 1) != 0)
    for (i = 0; i < XVECLEN (insn, 1); i++)
      walk_insn_part (XVECEXP (insn, 1, i), 1, 0);

  if (clobbers_seen_this_insn > max_clobbers_per_insn)
    max_clobbers_per_insn = clobbers_seen_this_insn;
  if (dup_operands_seen_this_insn > max_dup_operands)
    max_dup_operands = dup_operands_seen_this_insn;
}

/* Similar but scan a define_expand.  */

static void
gen_expand (rtx insn)
{
  int i;

  /* Walk the insn pattern to gather the #define's status.  */

  /* Note that we don't bother recording the number of MATCH_DUPs
     that occur in a gen_expand, because only reload cares about that.  */
  if (XVEC (insn, 1) != 0)
    for (i = 0; i < XVECLEN (insn, 1); i++)
      {
	/* Compute the maximum SETs and CLOBBERS
	   in any one of the sub-insns;
	   don't sum across all of them.  */
	clobbers_seen_this_insn = 0;

	walk_insn_part (XVECEXP (insn, 1, i), 0, 0);

	if (clobbers_seen_this_insn > max_clobbers_per_insn)
	  max_clobbers_per_insn = clobbers_seen_this_insn;
      }
}

/* Similar but scan a define_split.  */

static void
gen_split (rtx split)
{
  int i;

  /* Look through the patterns that are matched
     to compute the maximum operand number.  */
  for (i = 0; i < XVECLEN (split, 0); i++)
    walk_insn_part (XVECEXP (split, 0, i), 1, 0);
  /* Look at the number of insns this insn could split into.  */
  if (XVECLEN (split, 2) > max_insns_per_split)
    max_insns_per_split = XVECLEN (split, 2);
}

static void
gen_peephole (rtx peep)
{
  int i;

  /* Look through the patterns that are matched
     to compute the maximum operand number.  */
  for (i = 0; i < XVECLEN (peep, 0); i++)
    walk_insn_part (XVECEXP (peep, 0, i), 1, 0);
}

static void
gen_peephole2 (rtx peep)
{
  int i, n;

  /* Look through the patterns that are matched
     to compute the maximum operand number.  */
  for (i = XVECLEN (peep, 0) - 1; i >= 0; --i)
    walk_insn_part (XVECEXP (peep, 0, i), 1, 0);

  /* Look at the number of insns this insn can be matched from.  */
  for (i = XVECLEN (peep, 0) - 1, n = 0; i >= 0; --i)
    if (GET_CODE (XVECEXP (peep, 0, i)) != MATCH_DUP
	&& GET_CODE (XVECEXP (peep, 0, i)) != MATCH_SCRATCH)
      n++;
  if (n > max_insns_per_peep2)
    max_insns_per_peep2 = n;
}

int
main (int argc, char **argv)
{
  rtx desc;

  progname = "genconfig";

  if (!init_rtx_reader_args (argc, argv))
    return (FATAL_EXIT_CODE);

  puts ("/* Generated automatically by the program `genconfig'");
  puts ("   from the machine description file `md'.  */\n");
  puts ("#ifndef GCC_INSN_CONFIG_H");
  puts ("#define GCC_INSN_CONFIG_H\n");

  /* Allow at least 30 operands for the sake of asm constructs.  */
  /* ??? We *really* ought to reorganize things such that there
     is no fixed upper bound.  */
  max_recog_operands = 29;  /* We will add 1 later.  */
  max_dup_operands = 1;

  /* Read the machine description.  */

  while (1)
    {
      int line_no, insn_code_number = 0;

      desc = read_md_rtx (&line_no, &insn_code_number);
      if (desc == NULL)
	break;

      switch (GET_CODE (desc))
	{
  	  case DEFINE_INSN:
	    gen_insn (desc);
	    break;

	  case DEFINE_EXPAND:
	    gen_expand (desc);
	    break;

	  case DEFINE_SPLIT:
	    gen_split (desc);
	    break;

	  case DEFINE_PEEPHOLE2:
	    have_peephole2_flag = 1;
	    gen_peephole2 (desc);
	    break;

	  case DEFINE_PEEPHOLE:
	    have_peephole_flag = 1;
	    gen_peephole (desc);
	    break;

	  default:
	    break;
	}
    }

  printf ("#define MAX_RECOG_OPERANDS %d\n", max_recog_operands + 1);
  printf ("#define MAX_DUP_OPERANDS %d\n", max_dup_operands);

  /* This is conditionally defined, in case the user writes code which emits
     more splits than we can readily see (and knows s/he does it).  */
  printf ("#ifndef MAX_INSNS_PER_SPLIT\n");
  printf ("#define MAX_INSNS_PER_SPLIT %d\n", max_insns_per_split);
  printf ("#endif\n");

  if (have_cc0_flag)
    {
      printf ("#define HAVE_cc0 1\n");
      printf ("#define CC0_P(X) ((X) == cc0_rtx)\n");
    }
  else
    {
      /* We output CC0_P this way to make sure that X is declared
	 somewhere.  */
      printf ("#define CC0_P(X) ((X) ? 0 : 0)\n");
    }

  if (have_cmove_flag)
    printf ("#define HAVE_conditional_move 1\n");

  if (have_cond_exec_flag)
    printf ("#define HAVE_conditional_execution 1\n");

  if (have_lo_sum_flag)
    printf ("#define HAVE_lo_sum 1\n");

  if (have_peephole_flag)
    printf ("#define HAVE_peephole 1\n");

  if (have_peephole2_flag)
    {
      printf ("#define HAVE_peephole2 1\n");
      printf ("#define MAX_INSNS_PER_PEEP2 %d\n", max_insns_per_peep2);
    }

  puts ("\n#endif /* GCC_INSN_CONFIG_H */");

  if (ferror (stdout) || fflush (stdout) || fclose (stdout))
    return FATAL_EXIT_CODE;

  return SUCCESS_EXIT_CODE;
}