summaryrefslogtreecommitdiff
path: root/gcc/genattr.c
blob: 44ba0e00714ed662df8b0f385b123847b76c829c (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
/* Generate attribute information (insn-attr.h) from machine description.
   Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004
   Free Software Foundation, Inc.
   Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)

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, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.  */


#include "bconfig.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "errors.h"
#include "gensupport.h"


static void write_upcase (const char *);
static void gen_attr (rtx);

static void
write_upcase (const char *str)
{
  for (; *str; str++)
    putchar (TOUPPER(*str));
}

static void
gen_attr (rtx attr)
{
  const char *p, *tag;
  int is_const = GET_CODE (XEXP (attr, 2)) == CONST;

  printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));

  /* If numeric attribute, don't need to write an enum.  */
  p = XSTR (attr, 1);
  if (*p == '\0')
    printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0),
	    (is_const ? "void" : "rtx"));
  else
    {
      printf ("enum attr_%s {", XSTR (attr, 0));

      while ((tag = scan_comma_elt (&p)) != 0)
	{
	  write_upcase (XSTR (attr, 0));
	  putchar ('_');
	  while (tag != p)
	    putchar (TOUPPER (*tag++));
	  if (*p == ',')
	    fputs (", ", stdout);
	}

      fputs ("};\n", stdout);
      printf ("extern enum attr_%s get_attr_%s (%s);\n\n",
	      XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
    }

  /* If `length' attribute, write additional function definitions and define
     variables used by `insn_current_length'.  */
  if (! strcmp (XSTR (attr, 0), "length"))
    {
      puts ("\
extern void shorten_branches (rtx);\n\
extern int insn_default_length (rtx);\n\
extern int insn_variable_length_p (rtx);\n\
extern int insn_current_length (rtx);\n\n\
#include \"insn-addr.h\"\n");
    }
}

int
main (int argc, char **argv)
{
  rtx desc;
  int have_delay = 0;
  int have_annul_true = 0;
  int have_annul_false = 0;
  int num_insn_reservations = 0;
  int i;

  progname = "genattr";

  if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
    return (FATAL_EXIT_CODE);

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

  /* For compatibility, define the attribute `alternative', which is just
     a reference to the variable `which_alternative'.  */

  puts ("#define HAVE_ATTR_alternative");
  puts ("#define get_attr_alternative(insn) which_alternative");

  /* Read the machine description.  */

  while (1)
    {
      int line_no, insn_code_number;

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

      if (GET_CODE (desc) == DEFINE_ATTR)
	gen_attr (desc);

      else if (GET_CODE (desc) == DEFINE_DELAY)
        {
	  if (! have_delay)
	    {
	      printf ("#define DELAY_SLOTS\n");
	      printf ("extern int num_delay_slots (rtx);\n");
	      printf ("extern int eligible_for_delay (rtx, int, rtx, int);\n\n");
	      printf ("extern int const_num_delay_slots (rtx);\n\n");
	      have_delay = 1;
	    }

	  for (i = 0; i < XVECLEN (desc, 1); i += 3)
	    {
	      if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
		{
		  printf ("#define ANNUL_IFTRUE_SLOTS\n");
		  printf ("extern int eligible_for_annul_true (rtx, int, rtx, int);\n");
		  have_annul_true = 1;
		}

	      if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
		{
		  printf ("#define ANNUL_IFFALSE_SLOTS\n");
		  printf ("extern int eligible_for_annul_false (rtx, int, rtx, int);\n");
		  have_annul_false = 1;
		}
	    }
        }

      else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
	num_insn_reservations++;
    }

  if (num_insn_reservations > 0)
    {
      /* Output interface for pipeline hazards recognition based on
	 DFA (deterministic finite state automata.  */
      printf ("\n#define INSN_SCHEDULING\n");
      printf ("\n/* DFA based pipeline interface.  */");
      printf ("\n#ifndef AUTOMATON_ALTS\n");
      printf ("#define AUTOMATON_ALTS 0\n");
      printf ("#endif\n\n");
      printf ("\n#ifndef AUTOMATON_STATE_ALTS\n");
      printf ("#define AUTOMATON_STATE_ALTS 0\n");
      printf ("#endif\n\n");
      printf ("#ifndef CPU_UNITS_QUERY\n");
      printf ("#define CPU_UNITS_QUERY 0\n");
      printf ("#endif\n\n");
      /* Interface itself: */
      printf ("extern int max_dfa_issue_rate;\n\n");
      printf ("/* The following macro value is calculated from the\n");
      printf ("   automaton based pipeline description and is equal to\n");
      printf ("   maximal number of all insns described in constructions\n");
      printf ("   `define_insn_reservation' which can be issued on the\n");
      printf ("   same processor cycle. */\n");
      printf ("#define MAX_DFA_ISSUE_RATE max_dfa_issue_rate\n\n");
      printf ("/* Insn latency time defined in define_insn_reservation. */\n");
      printf ("extern int insn_default_latency (rtx);\n\n");
      printf ("/* Return nonzero if there is a bypass for given insn\n");
      printf ("   which is a data producer.  */\n");
      printf ("extern int bypass_p (rtx);\n\n");
      printf ("/* Insn latency time on data consumed by the 2nd insn.\n");
      printf ("   Use the function if bypass_p returns nonzero for\n");
      printf ("   the 1st insn. */\n");
      printf ("extern int insn_latency (rtx, rtx);\n\n");
      printf ("\n#if AUTOMATON_ALTS\n");
      printf ("/* The following function returns number of alternative\n");
      printf ("   reservations of given insn.  It may be used for better\n");
      printf ("   insns scheduling heuristics. */\n");
      printf ("extern int insn_alts (rtx);\n\n");
      printf ("#endif\n\n");
      printf ("/* Maximal possible number of insns waiting results being\n");
      printf ("   produced by insns whose execution is not finished. */\n");
      printf ("extern int max_insn_queue_index;\n\n");
      printf ("/* Pointer to data describing current state of DFA.  */\n");
      printf ("typedef void *state_t;\n\n");
      printf ("/* Size of the data in bytes.  */\n");
      printf ("extern int state_size (void);\n\n");
      printf ("/* Initiate given DFA state, i.e. Set up the state\n");
      printf ("   as all functional units were not reserved.  */\n");
      printf ("extern void state_reset (state_t);\n");
      printf ("/* The following function returns negative value if given\n");
      printf ("   insn can be issued in processor state described by given\n");
      printf ("   DFA state.  In this case, the DFA state is changed to\n");
      printf ("   reflect the current and future reservations by given\n");
      printf ("   insn.  Otherwise the function returns minimal time\n");
      printf ("   delay to issue the insn.  This delay may be zero\n");
      printf ("   for superscalar or VLIW processors.  If the second\n");
      printf ("   parameter is NULL the function changes given DFA state\n");
      printf ("   as new processor cycle started.  */\n");
      printf ("extern int state_transition (state_t, rtx);\n");
      printf ("\n#if AUTOMATON_STATE_ALTS\n");
      printf ("/* The following function returns number of possible\n");
      printf ("   alternative reservations of given insn in given\n");
      printf ("   DFA state.  It may be used for better insns scheduling\n");
      printf ("   heuristics.  By default the function is defined if\n");
      printf ("   macro AUTOMATON_STATE_ALTS is defined because its\n");
      printf ("   implementation may require much memory.  */\n");
      printf ("extern int state_alts (state_t, rtx);\n");
      printf ("#endif\n\n");
      printf ("extern int min_issue_delay (state_t, rtx);\n");
      printf ("/* The following function returns nonzero if no one insn\n");
      printf ("   can be issued in current DFA state. */\n");
      printf ("extern int state_dead_lock_p (state_t);\n");
      printf ("/* The function returns minimal delay of issue of the 2nd\n");
      printf ("   insn after issuing the 1st insn in given DFA state.\n");
      printf ("   The 1st insn should be issued in given state (i.e.\n");
      printf ("    state_transition should return negative value for\n");
      printf ("    the insn and the state).  Data dependencies between\n");
      printf ("    the insns are ignored by the function.  */\n");
      printf
	("extern int min_insn_conflict_delay (state_t, rtx, rtx);\n");
      printf ("/* The following function outputs reservations for given\n");
      printf ("   insn as they are described in the corresponding\n");
      printf ("   define_insn_reservation.  */\n");
      printf ("extern void print_reservation (FILE *, rtx);\n");
      printf ("\n#if CPU_UNITS_QUERY\n");
      printf ("/* The following function returns code of functional unit\n");
      printf ("   with given name (see define_cpu_unit). */\n");
      printf ("extern int get_cpu_unit_code (const char *);\n");
      printf ("/* The following function returns nonzero if functional\n");
      printf ("   unit with given code is currently reserved in given\n");
      printf ("   DFA state.  */\n");
      printf ("extern int cpu_unit_reservation_p (state_t, int);\n");
      printf ("#endif\n\n");
      printf ("/* Clean insn code cache.  It should be called if there\n");
      printf ("   is a chance that condition value in a\n");
      printf ("   define_insn_reservation will be changed after\n");
      printf ("   last call of dfa_start.  */\n");
      printf ("extern void dfa_clean_insn_cache (void);\n\n");
      printf ("/* Initiate and finish work with DFA.  They should be\n");
      printf ("   called as the first and the last interface\n");
      printf ("   functions.  */\n");
      printf ("extern void dfa_start (void);\n");
      printf ("extern void dfa_finish (void);\n");
    }
  else
    {
      /* Otherwise we do no scheduling, but we need these typedefs
	 in order to avoid uglifying other code with more ifdefs.  */
      printf ("typedef void *state_t;\n\n");
    }

  /* Output flag masks for use by reorg.

     Flags are used to hold branch direction and prediction information
     for use by eligible_for_...  */
  printf("\n#define ATTR_FLAG_forward\t0x1\n");
  printf("#define ATTR_FLAG_backward\t0x2\n");
  printf("#define ATTR_FLAG_likely\t0x4\n");
  printf("#define ATTR_FLAG_very_likely\t0x8\n");
  printf("#define ATTR_FLAG_unlikely\t0x10\n");
  printf("#define ATTR_FLAG_very_unlikely\t0x20\n");

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

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

  return SUCCESS_EXIT_CODE;
}

/* Define this so we can link with print-rtl.o to get debug_rtx function.  */
const char *
get_insn_name (int code ATTRIBUTE_UNUSED)
{
  return NULL;
}