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gcc.gnu.org Git - gcc.git/blob - gcc/genattr.c
1 /* Generate attribute information (insn-attr.h) from machine description.
2 Copyright (C) 1991, 1994 Free Software Foundation, Inc.
3 Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
28 static struct obstack obstack
;
29 struct obstack
*rtl_obstack
= &obstack
;
31 #define obstack_chunk_alloc xmalloc
32 #define obstack_chunk_free free
34 extern void free
PROTO((void *));
35 extern rtx read_rtx
PROTO((FILE *));
37 char *xmalloc
PROTO((unsigned));
39 void fancy_abort
PROTO((void));
41 /* A range of values. */
49 /* Record information about each function unit mentioned in a
50 DEFINE_FUNCTION_UNIT. */
54 char *name
; /* Function unit name. */
55 struct function_unit
*next
; /* Next function unit. */
56 int multiplicity
; /* Number of units of this type. */
57 int simultaneity
; /* Maximum number of simultaneous insns
58 on this function unit or 0 if unlimited. */
59 struct range ready_cost
; /* Range of ready cost values. */
60 struct range issue_delay
; /* Range of issue delay values. */
64 extend_range (range
, min
, max
)
69 if (range
->min
> min
) range
->min
= min
;
70 if (range
->max
< max
) range
->max
= max
;
86 if (*str
>= 'a' && *str
<= 'z')
87 printf ("%c", *str
- 'a' + 'A');
98 printf ("#define HAVE_ATTR_%s\n", XSTR (attr
, 0));
100 /* If numeric attribute, don't need to write an enum. */
101 if (*XSTR (attr
, 1) == '\0')
102 printf ("extern int get_attr_%s ();\n", XSTR (attr
, 0));
105 printf ("enum attr_%s {", XSTR (attr
, 0));
106 write_upcase (XSTR (attr
, 0));
109 for (p
= XSTR (attr
, 1); *p
!= '\0'; p
++)
114 write_upcase (XSTR (attr
, 0));
117 else if (*p
>= 'a' && *p
<= 'z')
118 printf ("%c", *p
- 'a' + 'A');
124 printf ("extern enum attr_%s get_attr_%s ();\n\n",
125 XSTR (attr
, 0), XSTR (attr
, 0));
128 /* If `length' attribute, write additional function definitions and define
129 variables used by `insn_current_length'. */
130 if (! strcmp (XSTR (attr
, 0), "length"))
132 printf ("extern void init_lengths ();\n");
133 printf ("extern void shorten_branches PROTO((rtx));\n");
134 printf ("extern int insn_default_length PROTO((rtx));\n");
135 printf ("extern int insn_variable_length_p PROTO((rtx));\n");
136 printf ("extern int insn_current_length PROTO((rtx));\n\n");
137 printf ("extern int *insn_addresses;\n");
138 printf ("extern int insn_current_address;\n\n");
143 write_units (num_units
, multiplicity
, simultaneity
,
144 ready_cost
, issue_delay
, blockage
)
146 struct range
*multiplicity
;
147 struct range
*simultaneity
;
148 struct range
*ready_cost
;
149 struct range
*issue_delay
;
150 struct range
*blockage
;
154 printf ("#define INSN_SCHEDULING\n\n");
155 printf ("extern int result_ready_cost PROTO((rtx));\n");
156 printf ("extern int function_units_used PROTO((rtx));\n\n");
157 printf ("extern struct function_unit_desc\n");
159 printf (" char *name;\n");
160 printf (" int bitmask;\n");
161 printf (" int multiplicity;\n");
162 printf (" int simultaneity;\n");
163 printf (" int default_cost;\n");
164 printf (" int max_issue_delay;\n");
165 printf (" int (*ready_cost_function) ();\n");
166 printf (" int (*conflict_cost_function) ();\n");
167 printf (" int max_blockage;\n");
168 printf (" unsigned int (*blockage_range_function) ();\n");
169 printf (" int (*blockage_function) ();\n");
170 printf ("} function_units[];\n\n");
171 printf ("#define FUNCTION_UNITS_SIZE %d\n", num_units
);
172 printf ("#define MIN_MULTIPLICITY %d\n", multiplicity
->min
);
173 printf ("#define MAX_MULTIPLICITY %d\n", multiplicity
->max
);
174 printf ("#define MIN_SIMULTANEITY %d\n", simultaneity
->min
);
175 printf ("#define MAX_SIMULTANEITY %d\n", simultaneity
->max
);
176 printf ("#define MIN_READY_COST %d\n", ready_cost
->min
);
177 printf ("#define MAX_READY_COST %d\n", ready_cost
->max
);
178 printf ("#define MIN_ISSUE_DELAY %d\n", issue_delay
->min
);
179 printf ("#define MAX_ISSUE_DELAY %d\n", issue_delay
->max
);
180 printf ("#define MIN_BLOCKAGE %d\n", blockage
->min
);
181 printf ("#define MAX_BLOCKAGE %d\n", blockage
->max
);
182 for (i
= 0; (1 << i
) < blockage
->max
; i
++)
184 printf ("#define BLOCKAGE_BITS %d\n", i
+ 1);
186 /* INSN_QUEUE_SIZE is a power of two larger than MAX_BLOCKAGE and
187 MAX_READY_COST. This is the longest time an isnsn may be queued. */
188 i
= MAX (blockage
->max
, ready_cost
->max
);
189 for (q_size
= 1; q_size
<= i
; q_size
<<= 1)
191 printf ("#define INSN_QUEUE_SIZE %d\n", q_size
);
198 register char *val
= (char *) malloc (size
);
201 fatal ("virtual memory exhausted");
210 char * result
= (char *) realloc (ptr
, size
);
212 fatal ("virtual memory exhausted");
220 fprintf (stderr
, "genattr: ");
221 fprintf (stderr
, s
, a1
, a2
);
222 fprintf (stderr
, "\n");
223 exit (FATAL_EXIT_CODE
);
226 /* More 'friendly' abort that prints the line and file.
227 config.h can #define abort fancy_abort if you like that sort of thing. */
232 fatal ("Internal gcc abort.");
244 int have_annul_true
= 0;
245 int have_annul_false
= 0;
247 struct range all_simultaneity
, all_multiplicity
;
248 struct range all_ready_cost
, all_issue_delay
, all_blockage
;
249 struct function_unit
*units
= 0, *unit
;
252 init_range (&all_multiplicity
);
253 init_range (&all_simultaneity
);
254 init_range (&all_ready_cost
);
255 init_range (&all_issue_delay
);
256 init_range (&all_blockage
);
258 obstack_init (rtl_obstack
);
261 fatal ("No input file name.");
263 infile
= fopen (argv
[1], "r");
267 exit (FATAL_EXIT_CODE
);
272 printf ("/* Generated automatically by the program `genattr'\n\
273 from the machine description file `md'. */\n\n");
275 /* For compatibility, define the attribute `alternative', which is just
276 a reference to the variable `which_alternative'. */
278 printf("#ifndef PROTO\n");
279 printf("#if defined (USE_PROTOTYPES) ? USE_PROTOTYPES : defined (__STDC__)\n");
280 printf("#define PROTO(ARGS) ARGS\n");
282 printf("#define PROTO(ARGS) ()\n");
286 printf ("#define HAVE_ATTR_alternative\n");
287 printf ("#define get_attr_alternative(insn) which_alternative\n");
289 /* Read the machine description. */
293 c
= read_skip_spaces (infile
);
298 desc
= read_rtx (infile
);
299 if (GET_CODE (desc
) == DEFINE_ATTR
)
302 else if (GET_CODE (desc
) == DEFINE_DELAY
)
306 printf ("#define DELAY_SLOTS\n");
307 printf ("extern int num_delay_slots PROTO((rtx));\n");
308 printf ("extern int eligible_for_delay PROTO((rtx, int, rtx, int));\n\n");
309 printf ("extern int const_num_delay_slots PROTO((rtx));\n\n");
313 for (i
= 0; i
< XVECLEN (desc
, 1); i
+= 3)
315 if (XVECEXP (desc
, 1, i
+ 1) && ! have_annul_true
)
317 printf ("#define ANNUL_IFTRUE_SLOTS\n");
318 printf ("extern int eligible_for_annul_true ();\n");
322 if (XVECEXP (desc
, 1, i
+ 2) && ! have_annul_false
)
324 printf ("#define ANNUL_IFFALSE_SLOTS\n");
325 printf ("extern int eligible_for_annul_false ();\n");
326 have_annul_false
= 1;
331 else if (GET_CODE (desc
) == DEFINE_FUNCTION_UNIT
)
333 char *name
= XSTR (desc
, 0);
334 int multiplicity
= XINT (desc
, 1);
335 int simultaneity
= XINT (desc
, 2);
336 int ready_cost
= MAX (XINT (desc
, 4), 1);
337 int issue_delay
= MAX (XINT (desc
, 5), 1);
338 int issueexp_p
= (XVEC (desc
, 6) != 0);
340 for (unit
= units
; unit
; unit
= unit
->next
)
341 if (strcmp (unit
->name
, name
) == 0)
346 int len
= strlen (name
) + 1;
347 unit
= (struct function_unit
*)
348 alloca (sizeof (struct function_unit
));
349 unit
->name
= (char *) alloca (len
);
350 bcopy (name
, unit
->name
, len
);
351 unit
->multiplicity
= multiplicity
;
352 unit
->simultaneity
= simultaneity
;
353 unit
->ready_cost
.min
= unit
->ready_cost
.max
= ready_cost
;
354 unit
->issue_delay
.min
= unit
->issue_delay
.max
= issue_delay
;
359 extend_range (&all_multiplicity
, multiplicity
, multiplicity
);
360 extend_range (&all_simultaneity
, simultaneity
, simultaneity
);
362 else if (unit
->multiplicity
!= multiplicity
363 || unit
->simultaneity
!= simultaneity
)
364 fatal ("Differing specifications given for `%s' function unit.",
367 extend_range (&unit
->ready_cost
, ready_cost
, ready_cost
);
368 extend_range (&unit
->issue_delay
,
369 issueexp_p
? 1 : issue_delay
, issue_delay
);
370 extend_range (&all_ready_cost
,
371 unit
->ready_cost
.min
, unit
->ready_cost
.max
);
372 extend_range (&all_issue_delay
,
373 unit
->issue_delay
.min
, unit
->issue_delay
.max
);
379 /* Compute the range of blockage cost values. See genattrtab.c
380 for the derivation. BLOCKAGE (E,C) when SIMULTANEITY is zero is
382 MAX (ISSUE-DELAY (E,C),
383 READY-COST (E) - (READY-COST (C) - 1))
387 MAX (ISSUE-DELAY (E,C),
388 READY-COST (E) - (READY-COST (C) - 1),
389 READY-COST (E) - FILL-TIME) */
391 for (unit
= units
; unit
; unit
= unit
->next
)
393 struct range blockage
;
395 blockage
= unit
->issue_delay
;
396 blockage
.max
= MAX (unit
->ready_cost
.max
397 - (unit
->ready_cost
.min
- 1),
399 blockage
.min
= MAX (1, blockage
.min
);
401 if (unit
->simultaneity
!= 0)
403 int fill_time
= ((unit
->simultaneity
- 1)
404 * unit
->issue_delay
.min
);
405 blockage
.min
= MAX (unit
->ready_cost
.min
- fill_time
,
407 blockage
.max
= MAX (unit
->ready_cost
.max
- fill_time
,
410 extend_range (&all_blockage
, blockage
.min
, blockage
.max
);
413 write_units (num_units
, &all_multiplicity
, &all_simultaneity
,
414 &all_ready_cost
, &all_issue_delay
, &all_blockage
);
417 /* Output flag masks for use by reorg.
419 Flags are used to hold branch direction and prediction information
420 for use by eligible_for_... */
421 printf("\n#define ATTR_FLAG_forward\t0x1\n");
422 printf("#define ATTR_FLAG_backward\t0x2\n");
423 printf("#define ATTR_FLAG_likely\t0x4\n");
424 printf("#define ATTR_FLAG_very_likely\t0x8\n");
425 printf("#define ATTR_FLAG_unlikely\t0x10\n");
426 printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
429 exit (ferror (stdout
) != 0 ? FATAL_EXIT_CODE
: SUCCESS_EXIT_CODE
);
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