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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [genattr.c] - Blame information for rev 751

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1 684 jeremybenn
/* Generate attribute information (insn-attr.h) from machine description.
2
   Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004, 2007, 2008,
3
   2010, 2011  Free Software Foundation, Inc.
4
   Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
5
 
6
This file is part of GCC.
7
 
8
GCC is free software; you can redistribute it and/or modify it under
9
the terms of the GNU General Public License as published by the Free
10
Software Foundation; either version 3, or (at your option) any later
11
version.
12
 
13
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14
WARRANTY; without even the implied warranty of MERCHANTABILITY or
15
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
16
for more details.
17
 
18
You should have received a copy of the GNU General Public License
19
along with GCC; see the file COPYING3.  If not see
20
<http://www.gnu.org/licenses/>.  */
21
 
22
 
23
#include "bconfig.h"
24
#include "system.h"
25
#include "coretypes.h"
26
#include "tm.h"
27
#include "rtl.h"
28
#include "errors.h"
29
#include "read-md.h"
30
#include "gensupport.h"
31
 
32
 
33
static void gen_attr (rtx);
34
 
35
static VEC (rtx, heap) *const_attrs, *reservations;
36
 
37
 
38
static void
39
gen_attr (rtx attr)
40
{
41
  const char *p;
42
  int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
43
 
44
  if (is_const)
45
    VEC_safe_push (rtx, heap, const_attrs, attr);
46
 
47
  printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
48
 
49
  /* If numeric attribute, don't need to write an enum.  */
50
  if (GET_CODE (attr) == DEFINE_ENUM_ATTR)
51
    printf ("extern enum %s get_attr_%s (%s);\n\n",
52
            XSTR (attr, 1), XSTR (attr, 0), (is_const ? "void" : "rtx"));
53
  else
54
    {
55
      p = XSTR (attr, 1);
56
      if (*p == '\0')
57
        printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0),
58
                (is_const ? "void" : "rtx"));
59
      else
60
        printf ("extern enum attr_%s get_attr_%s (%s);\n\n",
61
                XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
62
    }
63
 
64
  /* If `length' attribute, write additional function definitions and define
65
     variables used by `insn_current_length'.  */
66
  if (! strcmp (XSTR (attr, 0), "length"))
67
    {
68
      puts ("\
69
extern void shorten_branches (rtx);\n\
70
extern int insn_default_length (rtx);\n\
71
extern int insn_min_length (rtx);\n\
72
extern int insn_variable_length_p (rtx);\n\
73
extern int insn_current_length (rtx);\n\n\
74
#include \"insn-addr.h\"\n");
75
    }
76
}
77
 
78
/* Check that attribute NAME is used in define_insn_reservation condition
79
   EXP.  Return true if it is.  */
80
static bool
81
check_tune_attr (const char *name, rtx exp)
82
{
83
  switch (GET_CODE (exp))
84
    {
85
    case AND:
86
      if (check_tune_attr (name, XEXP (exp, 0)))
87
        return true;
88
      return check_tune_attr (name, XEXP (exp, 1));
89
 
90
    case IOR:
91
      return (check_tune_attr (name, XEXP (exp, 0))
92
              && check_tune_attr (name, XEXP (exp, 1)));
93
 
94
    case EQ_ATTR:
95
      return strcmp (XSTR (exp, 0), name) == 0;
96
 
97
    default:
98
      return false;
99
    }
100
}
101
 
102
/* Try to find a const attribute (usually cpu or tune) that is used
103
   in all define_insn_reservation conditions.  */
104
static bool
105
find_tune_attr (rtx exp)
106
{
107
  unsigned int i;
108
  rtx attr;
109
 
110
  switch (GET_CODE (exp))
111
    {
112
    case AND:
113
    case IOR:
114
      if (find_tune_attr (XEXP (exp, 0)))
115
        return true;
116
      return find_tune_attr (XEXP (exp, 1));
117
 
118
    case EQ_ATTR:
119
      if (strcmp (XSTR (exp, 0), "alternative") == 0)
120
        return false;
121
 
122
      FOR_EACH_VEC_ELT (rtx, const_attrs, i, attr)
123
        if (strcmp (XSTR (attr, 0), XSTR (exp, 0)) == 0)
124
          {
125
            unsigned int j;
126
            rtx resv;
127
 
128
            FOR_EACH_VEC_ELT (rtx, reservations, j, resv)
129
              if (! check_tune_attr (XSTR (attr, 0), XEXP (resv, 2)))
130
                return false;
131
            return true;
132
          }
133
      return false;
134
 
135
    default:
136
      return false;
137
    }
138
}
139
 
140
int
141
main (int argc, char **argv)
142
{
143
  rtx desc;
144
  int have_delay = 0;
145
  int have_annul_true = 0;
146
  int have_annul_false = 0;
147
  int num_insn_reservations = 0;
148
  int i;
149
 
150
  progname = "genattr";
151
 
152
  if (!init_rtx_reader_args (argc, argv))
153
    return (FATAL_EXIT_CODE);
154
 
155
  puts ("/* Generated automatically by the program `genattr'");
156
  puts ("   from the machine description file `md'.  */\n");
157
  puts ("#ifndef GCC_INSN_ATTR_H");
158
  puts ("#define GCC_INSN_ATTR_H\n");
159
 
160
  puts ("#include \"insn-attr-common.h\"\n");
161
 
162
  /* For compatibility, define the attribute `alternative', which is just
163
     a reference to the variable `which_alternative'.  */
164
 
165
  puts ("#define HAVE_ATTR_alternative");
166
  puts ("#define get_attr_alternative(insn) which_alternative");
167
 
168
  /* Read the machine description.  */
169
 
170
  while (1)
171
    {
172
      int line_no, insn_code_number;
173
 
174
      desc = read_md_rtx (&line_no, &insn_code_number);
175
      if (desc == NULL)
176
        break;
177
 
178
      if (GET_CODE (desc) == DEFINE_ATTR
179
          || GET_CODE (desc) == DEFINE_ENUM_ATTR)
180
        gen_attr (desc);
181
 
182
      else if (GET_CODE (desc) == DEFINE_DELAY)
183
        {
184
          if (! have_delay)
185
            {
186
              printf ("extern int num_delay_slots (rtx);\n");
187
              printf ("extern int eligible_for_delay (rtx, int, rtx, int);\n\n");
188
              printf ("extern int const_num_delay_slots (rtx);\n\n");
189
              have_delay = 1;
190
            }
191
 
192
          for (i = 0; i < XVECLEN (desc, 1); i += 3)
193
            {
194
              if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
195
                {
196
                  printf ("#define ANNUL_IFTRUE_SLOTS\n");
197
                  printf ("extern int eligible_for_annul_true (rtx, int, rtx, int);\n");
198
                  have_annul_true = 1;
199
                }
200
 
201
              if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
202
                {
203
                  printf ("#define ANNUL_IFFALSE_SLOTS\n");
204
                  printf ("extern int eligible_for_annul_false (rtx, int, rtx, int);\n");
205
                  have_annul_false = 1;
206
                }
207
            }
208
        }
209
 
210
      else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
211
        {
212
          num_insn_reservations++;
213
          VEC_safe_push (rtx, heap, reservations, desc);
214
        }
215
    }
216
 
217
  if (num_insn_reservations > 0)
218
    {
219
      bool has_tune_attr
220
        = find_tune_attr (XEXP (VEC_index (rtx, reservations, 0), 2));
221
      /* Output interface for pipeline hazards recognition based on
222
         DFA (deterministic finite state automata.  */
223
      printf ("\n/* DFA based pipeline interface.  */");
224
      printf ("\n#ifndef AUTOMATON_ALTS\n");
225
      printf ("#define AUTOMATON_ALTS 0\n");
226
      printf ("#endif\n\n");
227
      printf ("\n#ifndef AUTOMATON_STATE_ALTS\n");
228
      printf ("#define AUTOMATON_STATE_ALTS 0\n");
229
      printf ("#endif\n\n");
230
      printf ("#ifndef CPU_UNITS_QUERY\n");
231
      printf ("#define CPU_UNITS_QUERY 0\n");
232
      printf ("#endif\n\n");
233
      /* Interface itself: */
234
      if (has_tune_attr)
235
        {
236
          printf ("/* Initialize fn pointers for internal_dfa_insn_code\n");
237
          printf ("   and insn_default_latency.  */\n");
238
          printf ("extern void init_sched_attrs (void);\n\n");
239
          printf ("/* Internal insn code number used by automata.  */\n");
240
          printf ("extern int (*internal_dfa_insn_code) (rtx);\n\n");
241
          printf ("/* Insn latency time defined in define_insn_reservation. */\n");
242
          printf ("extern int (*insn_default_latency) (rtx);\n\n");
243
        }
244
      else
245
        {
246
          printf ("#define init_sched_attrs() do { } while (0)\n\n");
247
          printf ("/* Internal insn code number used by automata.  */\n");
248
          printf ("extern int internal_dfa_insn_code (rtx);\n\n");
249
          printf ("/* Insn latency time defined in define_insn_reservation. */\n");
250
          printf ("extern int insn_default_latency (rtx);\n\n");
251
        }
252
      printf ("/* Return nonzero if there is a bypass for given insn\n");
253
      printf ("   which is a data producer.  */\n");
254
      printf ("extern int bypass_p (rtx);\n\n");
255
      printf ("/* Insn latency time on data consumed by the 2nd insn.\n");
256
      printf ("   Use the function if bypass_p returns nonzero for\n");
257
      printf ("   the 1st insn. */\n");
258
      printf ("extern int insn_latency (rtx, rtx);\n\n");
259
      printf ("/* Maximal insn latency time possible of all bypasses for this insn.\n");
260
      printf ("   Use the function if bypass_p returns nonzero for\n");
261
      printf ("   the 1st insn. */\n");
262
      printf ("extern int maximal_insn_latency (rtx);\n\n");
263
      printf ("\n#if AUTOMATON_ALTS\n");
264
      printf ("/* The following function returns number of alternative\n");
265
      printf ("   reservations of given insn.  It may be used for better\n");
266
      printf ("   insns scheduling heuristics. */\n");
267
      printf ("extern int insn_alts (rtx);\n\n");
268
      printf ("#endif\n\n");
269
      printf ("/* Maximal possible number of insns waiting results being\n");
270
      printf ("   produced by insns whose execution is not finished. */\n");
271
      printf ("extern const int max_insn_queue_index;\n\n");
272
      printf ("/* Pointer to data describing current state of DFA.  */\n");
273
      printf ("typedef void *state_t;\n\n");
274
      printf ("/* Size of the data in bytes.  */\n");
275
      printf ("extern int state_size (void);\n\n");
276
      printf ("/* Initiate given DFA state, i.e. Set up the state\n");
277
      printf ("   as all functional units were not reserved.  */\n");
278
      printf ("extern void state_reset (state_t);\n");
279
      printf ("/* The following function returns negative value if given\n");
280
      printf ("   insn can be issued in processor state described by given\n");
281
      printf ("   DFA state.  In this case, the DFA state is changed to\n");
282
      printf ("   reflect the current and future reservations by given\n");
283
      printf ("   insn.  Otherwise the function returns minimal time\n");
284
      printf ("   delay to issue the insn.  This delay may be zero\n");
285
      printf ("   for superscalar or VLIW processors.  If the second\n");
286
      printf ("   parameter is NULL the function changes given DFA state\n");
287
      printf ("   as new processor cycle started.  */\n");
288
      printf ("extern int state_transition (state_t, rtx);\n");
289
      printf ("\n#if AUTOMATON_STATE_ALTS\n");
290
      printf ("/* The following function returns number of possible\n");
291
      printf ("   alternative reservations of given insn in given\n");
292
      printf ("   DFA state.  It may be used for better insns scheduling\n");
293
      printf ("   heuristics.  By default the function is defined if\n");
294
      printf ("   macro AUTOMATON_STATE_ALTS is defined because its\n");
295
      printf ("   implementation may require much memory.  */\n");
296
      printf ("extern int state_alts (state_t, rtx);\n");
297
      printf ("#endif\n\n");
298
      printf ("extern int min_issue_delay (state_t, rtx);\n");
299
      printf ("/* The following function returns nonzero if no one insn\n");
300
      printf ("   can be issued in current DFA state. */\n");
301
      printf ("extern int state_dead_lock_p (state_t);\n");
302
      printf ("/* The function returns minimal delay of issue of the 2nd\n");
303
      printf ("   insn after issuing the 1st insn in given DFA state.\n");
304
      printf ("   The 1st insn should be issued in given state (i.e.\n");
305
      printf ("    state_transition should return negative value for\n");
306
      printf ("    the insn and the state).  Data dependencies between\n");
307
      printf ("    the insns are ignored by the function.  */\n");
308
      printf
309
        ("extern int min_insn_conflict_delay (state_t, rtx, rtx);\n");
310
      printf ("/* The following function outputs reservations for given\n");
311
      printf ("   insn as they are described in the corresponding\n");
312
      printf ("   define_insn_reservation.  */\n");
313
      printf ("extern void print_reservation (FILE *, rtx);\n");
314
      printf ("\n#if CPU_UNITS_QUERY\n");
315
      printf ("/* The following function returns code of functional unit\n");
316
      printf ("   with given name (see define_cpu_unit). */\n");
317
      printf ("extern int get_cpu_unit_code (const char *);\n");
318
      printf ("/* The following function returns nonzero if functional\n");
319
      printf ("   unit with given code is currently reserved in given\n");
320
      printf ("   DFA state.  */\n");
321
      printf ("extern int cpu_unit_reservation_p (state_t, int);\n");
322
      printf ("#endif\n\n");
323
      printf ("/* The following function returns true if insn\n");
324
      printf ("   has a dfa reservation.  */\n");
325
      printf ("extern bool insn_has_dfa_reservation_p (rtx);\n\n");
326
      printf ("/* Clean insn code cache.  It should be called if there\n");
327
      printf ("   is a chance that condition value in a\n");
328
      printf ("   define_insn_reservation will be changed after\n");
329
      printf ("   last call of dfa_start.  */\n");
330
      printf ("extern void dfa_clean_insn_cache (void);\n\n");
331
      printf ("extern void dfa_clear_single_insn_cache (rtx);\n\n");
332
      printf ("/* Initiate and finish work with DFA.  They should be\n");
333
      printf ("   called as the first and the last interface\n");
334
      printf ("   functions.  */\n");
335
      printf ("extern void dfa_start (void);\n");
336
      printf ("extern void dfa_finish (void);\n");
337
    }
338
  else
339
    {
340
      /* Otherwise we do no scheduling, but we need these typedefs
341
         in order to avoid uglifying other code with more ifdefs.  */
342
      printf ("typedef void *state_t;\n\n");
343
    }
344
 
345
  /* Output flag masks for use by reorg.
346
 
347
     Flags are used to hold branch direction and prediction information
348
     for use by eligible_for_...  */
349
  printf("\n#define ATTR_FLAG_forward\t0x1\n");
350
  printf("#define ATTR_FLAG_backward\t0x2\n");
351
  printf("#define ATTR_FLAG_likely\t0x4\n");
352
  printf("#define ATTR_FLAG_very_likely\t0x8\n");
353
  printf("#define ATTR_FLAG_unlikely\t0x10\n");
354
  printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
355
 
356
  puts("\n#endif /* GCC_INSN_ATTR_H */");
357
 
358
  if (ferror (stdout) || fflush (stdout) || fclose (stdout))
359
    return FATAL_EXIT_CODE;
360
 
361
  return SUCCESS_EXIT_CODE;
362
}

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