1 /* Generate attribute information (insn-attr.h) from machine description.
2 Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
3 Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
27 #include "gensupport.h"
30 /* A range of values. */
38 /* Record information about each function unit mentioned in a
39 DEFINE_FUNCTION_UNIT. */
43 char *name; /* Function unit name. */
44 struct function_unit *next; /* Next function unit. */
45 int multiplicity; /* Number of units of this type. */
46 int simultaneity; /* Maximum number of simultaneous insns
47 on this function unit or 0 if unlimited. */
48 struct range ready_cost; /* Range of ready cost values. */
49 struct range issue_delay; /* Range of issue delay values. */
52 static void extend_range PARAMS ((struct range *, int, int));
53 static void init_range PARAMS ((struct range *));
54 static void write_upcase PARAMS ((const char *));
55 static void gen_attr PARAMS ((rtx));
56 static void write_units PARAMS ((int, struct range *, struct range *,
57 struct range *, struct range *,
60 extend_range (range, min, max)
65 if (range->min > min) range->min = min;
66 if (range->max < max) range->max = max;
82 putchar (TOUPPER(*str));
90 int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
92 printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
94 /* If numeric attribute, don't need to write an enum. */
97 printf ("extern int get_attr_%s PARAMS ((%s));\n", XSTR (attr, 0),
98 (is_const ? "void" : "rtx"));
101 printf ("enum attr_%s {", XSTR (attr, 0));
103 while ((tag = scan_comma_elt (&p)) != 0)
105 write_upcase (XSTR (attr, 0));
108 putchar (TOUPPER (*tag++));
109 fputs (", ", stdout);
112 fputs ("};\n", stdout);
113 printf ("extern enum attr_%s get_attr_%s PARAMS ((%s));\n\n",
114 XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
117 /* If `length' attribute, write additional function definitions and define
118 variables used by `insn_current_length'. */
119 if (! strcmp (XSTR (attr, 0), "length"))
122 extern void shorten_branches PARAMS ((rtx));\n\
123 extern int insn_default_length PARAMS ((rtx));\n\
124 extern int insn_variable_length_p PARAMS ((rtx));\n\
125 extern int insn_current_length PARAMS ((rtx));\n\n\
126 #include \"insn-addr.h\"\n");
131 write_units (num_units, multiplicity, simultaneity,
132 ready_cost, issue_delay, blockage)
134 struct range *multiplicity;
135 struct range *simultaneity;
136 struct range *ready_cost;
137 struct range *issue_delay;
138 struct range *blockage;
142 printf ("#define INSN_SCHEDULING\n\n");
143 printf ("extern int result_ready_cost PARAMS ((rtx));\n");
144 printf ("extern int function_units_used PARAMS ((rtx));\n\n");
145 printf ("extern const struct function_unit_desc\n");
147 printf (" const char *const name;\n");
148 printf (" const int bitmask;\n");
149 printf (" const int multiplicity;\n");
150 printf (" const int simultaneity;\n");
151 printf (" const int default_cost;\n");
152 printf (" const int max_issue_delay;\n");
153 printf (" int (*const ready_cost_function) PARAMS ((rtx));\n");
154 printf (" int (*const conflict_cost_function) PARAMS ((rtx, rtx));\n");
155 printf (" const int max_blockage;\n");
156 printf (" unsigned int (*const blockage_range_function) PARAMS ((rtx));\n");
157 printf (" int (*const blockage_function) PARAMS ((rtx, rtx));\n");
158 printf ("} function_units[];\n\n");
159 printf ("#define FUNCTION_UNITS_SIZE %d\n", num_units);
160 printf ("#define MIN_MULTIPLICITY %d\n", multiplicity->min);
161 printf ("#define MAX_MULTIPLICITY %d\n", multiplicity->max);
162 printf ("#define MIN_SIMULTANEITY %d\n", simultaneity->min);
163 printf ("#define MAX_SIMULTANEITY %d\n", simultaneity->max);
164 printf ("#define MIN_READY_COST %d\n", ready_cost->min);
165 printf ("#define MAX_READY_COST %d\n", ready_cost->max);
166 printf ("#define MIN_ISSUE_DELAY %d\n", issue_delay->min);
167 printf ("#define MAX_ISSUE_DELAY %d\n", issue_delay->max);
168 printf ("#define MIN_BLOCKAGE %d\n", blockage->min);
169 printf ("#define MAX_BLOCKAGE %d\n", blockage->max);
170 for (i = 0; (1 << i) < blockage->max; i++)
172 printf ("#define BLOCKAGE_BITS %d\n", i + 1);
174 /* INSN_QUEUE_SIZE is a power of two larger than MAX_BLOCKAGE and
175 MAX_READY_COST. This is the longest time an isnsn may be queued. */
176 i = MAX (blockage->max, ready_cost->max);
177 for (q_size = 1; q_size <= i; q_size <<= 1)
179 printf ("#define INSN_QUEUE_SIZE %d\n", q_size);
182 extern int main PARAMS ((int, char **));
191 int have_annul_true = 0;
192 int have_annul_false = 0;
193 int num_insn_reservations = 0;
195 struct range all_simultaneity, all_multiplicity;
196 struct range all_ready_cost, all_issue_delay, all_blockage;
197 struct function_unit *units = 0, *unit;
200 init_range (&all_multiplicity);
201 init_range (&all_simultaneity);
202 init_range (&all_ready_cost);
203 init_range (&all_issue_delay);
204 init_range (&all_blockage);
206 progname = "genattr";
209 fatal ("no input file name");
211 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
212 return (FATAL_EXIT_CODE);
214 puts ("/* Generated automatically by the program `genattr'");
215 puts (" from the machine description file `md'. */\n");
216 puts ("#ifndef GCC_INSN_ATTR_H");
217 puts ("#define GCC_INSN_ATTR_H\n");
219 /* For compatibility, define the attribute `alternative', which is just
220 a reference to the variable `which_alternative'. */
222 puts ("#define HAVE_ATTR_alternative");
223 puts ("#define get_attr_alternative(insn) which_alternative");
225 /* Read the machine description. */
229 int line_no, insn_code_number;
231 desc = read_md_rtx (&line_no, &insn_code_number);
235 if (GET_CODE (desc) == DEFINE_ATTR)
238 else if (GET_CODE (desc) == DEFINE_DELAY)
242 printf ("#define DELAY_SLOTS\n");
243 printf ("extern int num_delay_slots PARAMS ((rtx));\n");
244 printf ("extern int eligible_for_delay PARAMS ((rtx, int, rtx, int));\n\n");
245 printf ("extern int const_num_delay_slots PARAMS ((rtx));\n\n");
249 for (i = 0; i < XVECLEN (desc, 1); i += 3)
251 if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
253 printf ("#define ANNUL_IFTRUE_SLOTS\n");
254 printf ("extern int eligible_for_annul_true PARAMS ((rtx, int, rtx, int));\n");
258 if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
260 printf ("#define ANNUL_IFFALSE_SLOTS\n");
261 printf ("extern int eligible_for_annul_false PARAMS ((rtx, int, rtx, int));\n");
262 have_annul_false = 1;
267 else if (GET_CODE (desc) == DEFINE_FUNCTION_UNIT)
269 const char *name = XSTR (desc, 0);
270 int multiplicity = XINT (desc, 1);
271 int simultaneity = XINT (desc, 2);
272 int ready_cost = MAX (XINT (desc, 4), 1);
273 int issue_delay = MAX (XINT (desc, 5), 1);
274 int issueexp_p = (XVEC (desc, 6) != 0);
276 for (unit = units; unit; unit = unit->next)
277 if (strcmp (unit->name, name) == 0)
282 unit = (struct function_unit *)
283 xmalloc (sizeof (struct function_unit));
284 unit->name = xstrdup (name);
285 unit->multiplicity = multiplicity;
286 unit->simultaneity = simultaneity;
287 unit->ready_cost.min = unit->ready_cost.max = ready_cost;
288 unit->issue_delay.min = unit->issue_delay.max = issue_delay;
293 extend_range (&all_multiplicity, multiplicity, multiplicity);
294 extend_range (&all_simultaneity, simultaneity, simultaneity);
296 else if (unit->multiplicity != multiplicity
297 || unit->simultaneity != simultaneity)
298 fatal ("Differing specifications given for `%s' function unit",
301 extend_range (&unit->ready_cost, ready_cost, ready_cost);
302 extend_range (&unit->issue_delay,
303 issueexp_p ? 1 : issue_delay, issue_delay);
304 extend_range (&all_ready_cost,
305 unit->ready_cost.min, unit->ready_cost.max);
306 extend_range (&all_issue_delay,
307 unit->issue_delay.min, unit->issue_delay.max);
309 else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
310 num_insn_reservations++;
313 if (num_units > 0 || num_insn_reservations > 0)
316 printf ("#define TRADITIONAL_PIPELINE_INTERFACE 1\n");
318 if (num_insn_reservations > 0)
319 printf ("#define DFA_PIPELINE_INTERFACE 1\n");
321 /* Compute the range of blockage cost values. See genattrtab.c
322 for the derivation. BLOCKAGE (E,C) when SIMULTANEITY is zero is
324 MAX (ISSUE-DELAY (E,C),
325 READY-COST (E) - (READY-COST (C) - 1))
329 MAX (ISSUE-DELAY (E,C),
330 READY-COST (E) - (READY-COST (C) - 1),
331 READY-COST (E) - FILL-TIME) */
333 for (unit = units; unit; unit = unit->next)
335 struct range blockage;
337 blockage = unit->issue_delay;
338 blockage.max = MAX (unit->ready_cost.max
339 - (unit->ready_cost.min - 1),
341 blockage.min = MAX (1, blockage.min);
343 if (unit->simultaneity != 0)
345 int fill_time = ((unit->simultaneity - 1)
346 * unit->issue_delay.min);
347 blockage.min = MAX (unit->ready_cost.min - fill_time,
349 blockage.max = MAX (unit->ready_cost.max - fill_time,
352 extend_range (&all_blockage, blockage.min, blockage.max);
355 write_units (num_units, &all_multiplicity, &all_simultaneity,
356 &all_ready_cost, &all_issue_delay, &all_blockage);
358 /* Output interface for pipeline hazards recognition based on
359 DFA (deterministic finite state automata. */
360 printf ("\n/* DFA based pipeline interface. */");
361 printf ("\n#ifndef AUTOMATON_STATE_ALTS\n");
362 printf ("#define AUTOMATON_STATE_ALTS 0\n");
363 printf ("#endif\n\n");
364 printf ("#ifndef CPU_UNITS_QUERY\n");
365 printf ("#define CPU_UNITS_QUERY 0\n");
366 printf ("#endif\n\n");
367 /* Interface itself: */
368 printf ("extern int max_dfa_issue_rate;\n\n");
369 printf ("/* The following macro value is calculated from the\n");
370 printf (" automaton based pipeline description and is equal to\n");
371 printf (" maximal number of all insns described in constructions\n");
372 printf (" `define_insn_reservation' which can be issued on the\n");
373 printf (" same processor cycle. */\n");
374 printf ("#define MAX_DFA_ISSUE_RATE max_dfa_issue_rate\n\n");
375 printf ("/* Insn latency time defined in define_insn_reservation. */\n");
376 printf ("extern int insn_default_latency PARAMS ((rtx));\n\n");
377 printf ("/* Return nonzero if there is a bypass for given insn\n");
378 printf (" which is a data producer. */\n");
379 printf ("extern int bypass_p PARAMS ((rtx));\n\n");
380 printf ("/* Insn latency time on data consumed by the 2nd insn.\n");
381 printf (" Use the function if bypass_p returns nonzero for\n");
382 printf (" the 1st insn. */\n");
383 printf ("extern int insn_latency PARAMS ((rtx, rtx));\n\n");
384 printf ("/* The following function returns number of alternative\n");
385 printf (" reservations of given insn. It may be used for better\n");
386 printf (" insns scheduling heuristics. */\n");
387 printf ("extern int insn_alts PARAMS ((rtx));\n\n");
388 printf ("/* Maximal possible number of insns waiting results being\n");
389 printf (" produced by insns whose execution is not finished. */\n");
390 printf ("extern int max_insn_queue_index;\n\n");
391 printf ("/* Pointer to data describing current state of DFA. */\n");
392 printf ("typedef void *state_t;\n\n");
393 printf ("/* Size of the data in bytes. */\n");
394 printf ("extern int state_size PARAMS ((void));\n\n");
395 printf ("/* Initiate given DFA state, i.e. Set up the state\n");
396 printf (" as all functional units were not reserved. */\n");
397 printf ("extern void state_reset PARAMS ((state_t));\n");
398 printf ("/* The following function returns negative value if given\n");
399 printf (" insn can be issued in processor state described by given\n");
400 printf (" DFA state. In this case, the DFA state is changed to\n");
401 printf (" reflect the current and future reservations by given\n");
402 printf (" insn. Otherwise the function returns minimal time\n");
403 printf (" delay to issue the insn. This delay may be zero\n");
404 printf (" for superscalar or VLIW processors. If the second\n");
405 printf (" parameter is NULL the function changes given DFA state\n");
406 printf (" as new processor cycle started. */\n");
407 printf ("extern int state_transition PARAMS ((state_t, rtx));\n");
408 printf ("\n#if AUTOMATON_STATE_ALTS\n");
409 printf ("/* The following function returns number of possible\n");
410 printf (" alternative reservations of given insn in given\n");
411 printf (" DFA state. It may be used for better insns scheduling\n");
412 printf (" heuristics. By default the function is defined if\n");
413 printf (" macro AUTOMATON_STATE_ALTS is defined because its\n");
414 printf (" implementation may require much memory. */\n");
415 printf ("extern int state_alts PARAMS ((state_t, rtx));\n");
416 printf ("#endif\n\n");
417 printf ("extern int min_issue_delay PARAMS ((state_t, rtx));\n");
418 printf ("/* The following function returns nonzero if no one insn\n");
419 printf (" can be issued in current DFA state. */\n");
420 printf ("extern int state_dead_lock_p PARAMS ((state_t));\n");
421 printf ("/* The function returns minimal delay of issue of the 2nd\n");
422 printf (" insn after issuing the 1st insn in given DFA state.\n");
423 printf (" The 1st insn should be issued in given state (i.e.\n");
424 printf (" state_transition should return negative value for\n");
425 printf (" the insn and the state). Data dependencies between\n");
426 printf (" the insns are ignored by the function. */\n");
428 ("extern int min_insn_conflict_delay PARAMS ((state_t, rtx, rtx));\n");
429 printf ("/* The following function outputs reservations for given\n");
430 printf (" insn as they are described in the corresponding\n");
431 printf (" define_insn_reservation. */\n");
432 printf ("extern void print_reservation PARAMS ((FILE *, rtx));\n");
433 printf ("\n#if CPU_UNITS_QUERY\n");
434 printf ("/* The following function returns code of functional unit\n");
435 printf (" with given name (see define_cpu_unit). */\n");
436 printf ("extern int get_cpu_unit_code PARAMS ((const char *));\n");
437 printf ("/* The following function returns nonzero if functional\n");
438 printf (" unit with given code is currently reserved in given\n");
439 printf (" DFA state. */\n");
440 printf ("extern int cpu_unit_reservation_p PARAMS ((state_t, int));\n");
441 printf ("#endif\n\n");
442 printf ("/* Initiate and finish work with DFA. They should be\n");
443 printf (" called as the first and the last interface\n");
444 printf (" functions. */\n");
445 printf ("extern void dfa_start PARAMS ((void));\n");
446 printf ("extern void dfa_finish PARAMS ((void));\n");
450 /* Otherwise we do no scheduling, but we need these typedefs
451 in order to avoid uglifying other code with more ifdefs. */
452 printf ("typedef void *state_t;\n\n");
455 /* Output flag masks for use by reorg.
457 Flags are used to hold branch direction and prediction information
458 for use by eligible_for_... */
459 printf("\n#define ATTR_FLAG_forward\t0x1\n");
460 printf("#define ATTR_FLAG_backward\t0x2\n");
461 printf("#define ATTR_FLAG_likely\t0x4\n");
462 printf("#define ATTR_FLAG_very_likely\t0x8\n");
463 printf("#define ATTR_FLAG_unlikely\t0x10\n");
464 printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
466 puts("\n#endif /* GCC_INSN_ATTR_H */");
468 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
469 return FATAL_EXIT_CODE;
471 return SUCCESS_EXIT_CODE;
474 /* Define this so we can link with print-rtl.o to get debug_rtx function. */
477 int code ATTRIBUTE_UNUSED;