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1 : : /* Instruction scheduling pass. This file contains definitions used
2 : : internally in the scheduler.
3 : : Copyright (C) 1992-2024 Free Software Foundation, Inc.
4 : :
5 : : This file is part of GCC.
6 : :
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 3, or (at your option) any later
10 : : version.
11 : :
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
15 : : for more details.
16 : :
17 : : You should have received a copy of the GNU General Public License
18 : : along with GCC; see the file COPYING3. If not see
19 : : <http://www.gnu.org/licenses/>. */
20 : :
21 : : #ifndef GCC_SCHED_INT_H
22 : : #define GCC_SCHED_INT_H
23 : :
24 : : #ifdef INSN_SCHEDULING
25 : :
26 : : /* Identificator of a scheduler pass. */
27 : : enum sched_pass_id_t { SCHED_PASS_UNKNOWN, SCHED_RGN_PASS, SCHED_EBB_PASS,
28 : : SCHED_SMS_PASS, SCHED_SEL_PASS };
29 : :
30 : : /* The algorithm used to implement -fsched-pressure. */
31 : : enum sched_pressure_algorithm
32 : : {
33 : : SCHED_PRESSURE_NONE,
34 : : SCHED_PRESSURE_WEIGHTED,
35 : : SCHED_PRESSURE_MODEL
36 : : };
37 : :
38 : : typedef vec<basic_block> bb_vec_t;
39 : : typedef vec<rtx_insn *> insn_vec_t;
40 : : typedef vec<rtx_insn *> rtx_vec_t;
41 : :
42 : : extern void sched_init_bbs (void);
43 : :
44 : : extern void sched_extend_luids (void);
45 : : extern void sched_init_insn_luid (rtx_insn *);
46 : : extern void sched_init_luids (const bb_vec_t &);
47 : : extern void sched_finish_luids (void);
48 : :
49 : : extern void sched_extend_target (void);
50 : :
51 : : extern void haifa_init_h_i_d (const bb_vec_t &);
52 : : extern void haifa_finish_h_i_d (void);
53 : :
54 : : /* Hooks that are common to all the schedulers. */
55 : : struct common_sched_info_def
56 : : {
57 : : /* Called after blocks were rearranged due to movement of jump instruction.
58 : : The first parameter - index of basic block, in which jump currently is.
59 : : The second parameter - index of basic block, in which jump used
60 : : to be.
61 : : The third parameter - index of basic block, that follows the second
62 : : parameter. */
63 : : void (*fix_recovery_cfg) (int, int, int);
64 : :
65 : : /* Called to notify frontend, that new basic block is being added.
66 : : The first parameter - new basic block.
67 : : The second parameter - block, after which new basic block is being added,
68 : : or the exit block, if recovery block is being added,
69 : : or NULL, if standalone block is being added. */
70 : : void (*add_block) (basic_block, basic_block);
71 : :
72 : : /* Estimate number of insns in the basic block. */
73 : : int (*estimate_number_of_insns) (basic_block);
74 : :
75 : : /* Given a non-insn (!INSN_P (x)) return
76 : : -1 - if this rtx don't need a luid.
77 : : 0 - if it should have the same luid as the previous insn.
78 : : 1 - if it needs a separate luid. */
79 : : int (*luid_for_non_insn) (rtx);
80 : :
81 : : /* Scheduler pass identifier. It is preferably used in assertions. */
82 : : enum sched_pass_id_t sched_pass_id;
83 : : };
84 : :
85 : : extern struct common_sched_info_def *common_sched_info;
86 : :
87 : : extern const struct common_sched_info_def haifa_common_sched_info;
88 : :
89 : : /* Return true if selective scheduling pass is working. */
90 : : inline bool
91 : 345119659 : sel_sched_p (void)
92 : : {
93 : 345119659 : return common_sched_info->sched_pass_id == SCHED_SEL_PASS;
94 : : }
95 : :
96 : : /* Returns maximum priority that an insn was assigned to. */
97 : : extern int get_rgn_sched_max_insns_priority (void);
98 : :
99 : : /* Increases effective priority for INSN by AMOUNT. */
100 : : extern void sel_add_to_insn_priority (rtx, int);
101 : :
102 : : /* True if during selective scheduling we need to emulate some of haifa
103 : : scheduler behavior. */
104 : : extern int sched_emulate_haifa_p;
105 : :
106 : : /* Mapping from INSN_UID to INSN_LUID. In the end all other per insn data
107 : : structures should be indexed by luid. */
108 : : extern vec<int> sched_luids;
109 : : #define INSN_LUID(INSN) (sched_luids[INSN_UID (INSN)])
110 : : #define LUID_BY_UID(UID) (sched_luids[UID])
111 : :
112 : : #define SET_INSN_LUID(INSN, LUID) \
113 : : (sched_luids[INSN_UID (INSN)] = (LUID))
114 : :
115 : : /* The highest INSN_LUID. */
116 : : extern int sched_max_luid;
117 : :
118 : : extern int insn_luid (rtx);
119 : :
120 : : /* This list holds ripped off notes from the current block. These notes will
121 : : be attached to the beginning of the block when its scheduling is
122 : : finished. */
123 : : extern rtx_insn *note_list;
124 : :
125 : : extern void remove_notes (rtx_insn *, rtx_insn *);
126 : : extern rtx_insn *restore_other_notes (rtx_insn *, basic_block);
127 : : extern void sched_insns_init (rtx);
128 : : extern void sched_insns_finish (void);
129 : :
130 : : extern void *xrecalloc (void *, size_t, size_t, size_t);
131 : :
132 : : extern void reemit_notes (rtx_insn *);
133 : :
134 : : /* Functions in haifa-sched.cc. */
135 : : extern int haifa_classify_insn (const_rtx);
136 : :
137 : : /* Functions in sel-sched-ir.cc. */
138 : : extern void sel_find_rgns (void);
139 : : extern void sel_mark_hard_insn (rtx);
140 : :
141 : : extern size_t dfa_state_size;
142 : :
143 : : extern void advance_state (state_t);
144 : :
145 : : extern void setup_sched_dump (void);
146 : : extern void sched_init (void);
147 : : extern void sched_finish (void);
148 : :
149 : : extern bool sel_insn_is_speculation_check (rtx);
150 : :
151 : : /* Describe the ready list of the scheduler.
152 : : VEC holds space enough for all insns in the current region. VECLEN
153 : : says how many exactly.
154 : : FIRST is the index of the element with the highest priority; i.e. the
155 : : last one in the ready list, since elements are ordered by ascending
156 : : priority.
157 : : N_READY determines how many insns are on the ready list.
158 : : N_DEBUG determines how many debug insns are on the ready list. */
159 : : struct ready_list
160 : : {
161 : : rtx_insn **vec;
162 : : int veclen;
163 : : int first;
164 : : int n_ready;
165 : : int n_debug;
166 : : };
167 : :
168 : : extern signed char *ready_try;
169 : : extern struct ready_list ready;
170 : :
171 : : extern int max_issue (struct ready_list *, int, state_t, bool, int *);
172 : :
173 : : extern void ebb_compute_jump_reg_dependencies (rtx, regset);
174 : :
175 : : extern edge find_fallthru_edge_from (basic_block);
176 : :
177 : : extern void (* sched_init_only_bb) (basic_block, basic_block);
178 : : extern basic_block (* sched_split_block) (basic_block, rtx);
179 : : extern basic_block sched_split_block_1 (basic_block, rtx);
180 : : extern basic_block (* sched_create_empty_bb) (basic_block);
181 : : extern basic_block sched_create_empty_bb_1 (basic_block);
182 : :
183 : : extern basic_block sched_create_recovery_block (basic_block *);
184 : : extern void sched_create_recovery_edges (basic_block, basic_block,
185 : : basic_block);
186 : :
187 : : /* Pointer to data describing the current DFA state. */
188 : : extern state_t curr_state;
189 : :
190 : : /* Type to represent status of a dependence. */
191 : : typedef unsigned int ds_t;
192 : : #define BITS_PER_DEP_STATUS HOST_BITS_PER_INT
193 : :
194 : : /* Type to represent weakness of speculative dependence. */
195 : : typedef unsigned int dw_t;
196 : :
197 : : extern enum reg_note ds_to_dk (ds_t);
198 : : extern ds_t dk_to_ds (enum reg_note);
199 : :
200 : : /* Describe a dependency that can be broken by making a replacement
201 : : in one of the patterns. LOC is the location, ORIG and NEWVAL the
202 : : two alternative contents, and INSN the instruction that must be
203 : : changed. */
204 : : struct dep_replacement
205 : : {
206 : : rtx *loc;
207 : : rtx orig;
208 : : rtx newval;
209 : : rtx_insn *insn;
210 : : };
211 : :
212 : : /* Information about the dependency. */
213 : : struct _dep
214 : : {
215 : : /* Producer. */
216 : : rtx_insn *pro;
217 : :
218 : : /* Consumer. */
219 : : rtx_insn *con;
220 : :
221 : : /* If nonnull, holds a pointer to information about how to break the
222 : : dependency by making a replacement in one of the insns. There is
223 : : only one such dependency for each insn that must be modified in
224 : : order to break such a dependency. */
225 : : struct dep_replacement *replace;
226 : :
227 : : /* Dependency status. This field holds all dependency types and additional
228 : : information for speculative dependencies. */
229 : : ds_t status;
230 : :
231 : : /* Dependency major type. This field is superseded by STATUS above.
232 : : Though, it is still in place because some targets use it. */
233 : : ENUM_BITFIELD(reg_note) type:6;
234 : :
235 : : unsigned nonreg:1;
236 : : unsigned multiple:1;
237 : :
238 : : /* Cached cost of the dependency. Make sure to update UNKNOWN_DEP_COST
239 : : when changing the size of this field. */
240 : : int cost:20;
241 : :
242 : : unsigned unused:4;
243 : : };
244 : :
245 : : #define UNKNOWN_DEP_COST ((int) ((unsigned int) -1 << 19))
246 : :
247 : : typedef struct _dep dep_def;
248 : : typedef dep_def *dep_t;
249 : :
250 : : #define DEP_PRO(D) ((D)->pro)
251 : : #define DEP_CON(D) ((D)->con)
252 : : #define DEP_TYPE(D) ((D)->type)
253 : : #define DEP_STATUS(D) ((D)->status)
254 : : #define DEP_COST(D) ((D)->cost)
255 : : #define DEP_NONREG(D) ((D)->nonreg)
256 : : #define DEP_MULTIPLE(D) ((D)->multiple)
257 : : #define DEP_REPLACE(D) ((D)->replace)
258 : :
259 : : /* Functions to work with dep. */
260 : :
261 : : extern void init_dep_1 (dep_t, rtx_insn *, rtx_insn *, enum reg_note, ds_t);
262 : : extern void init_dep (dep_t, rtx_insn *, rtx_insn *, enum reg_note);
263 : :
264 : : extern void sd_debug_dep (dep_t);
265 : :
266 : : /* Definition of this struct resides below. */
267 : : struct _dep_node;
268 : : typedef struct _dep_node *dep_node_t;
269 : :
270 : : /* A link in the dependency list. This is essentially an equivalent of a
271 : : single {INSN, DEPS}_LIST rtx. */
272 : : struct _dep_link
273 : : {
274 : : /* Dep node with all the data. */
275 : : dep_node_t node;
276 : :
277 : : /* Next link in the list. For the last one it is NULL. */
278 : : struct _dep_link *next;
279 : :
280 : : /* Pointer to the next field of the previous link in the list.
281 : : For the first link this points to the deps_list->first.
282 : :
283 : : With help of this field it is easy to remove and insert links to the
284 : : list. */
285 : : struct _dep_link **prev_nextp;
286 : : };
287 : : typedef struct _dep_link *dep_link_t;
288 : :
289 : : #define DEP_LINK_NODE(N) ((N)->node)
290 : : #define DEP_LINK_NEXT(N) ((N)->next)
291 : : #define DEP_LINK_PREV_NEXTP(N) ((N)->prev_nextp)
292 : :
293 : : /* Macros to work dep_link. For most usecases only part of the dependency
294 : : information is need. These macros conveniently provide that piece of
295 : : information. */
296 : :
297 : : #define DEP_LINK_DEP(N) (DEP_NODE_DEP (DEP_LINK_NODE (N)))
298 : : #define DEP_LINK_PRO(N) (DEP_PRO (DEP_LINK_DEP (N)))
299 : : #define DEP_LINK_CON(N) (DEP_CON (DEP_LINK_DEP (N)))
300 : : #define DEP_LINK_TYPE(N) (DEP_TYPE (DEP_LINK_DEP (N)))
301 : : #define DEP_LINK_STATUS(N) (DEP_STATUS (DEP_LINK_DEP (N)))
302 : :
303 : : /* A list of dep_links. */
304 : : struct _deps_list
305 : : {
306 : : /* First element. */
307 : : dep_link_t first;
308 : :
309 : : /* Total number of elements in the list. */
310 : : int n_links;
311 : : };
312 : : typedef struct _deps_list *deps_list_t;
313 : :
314 : : #define DEPS_LIST_FIRST(L) ((L)->first)
315 : : #define DEPS_LIST_N_LINKS(L) ((L)->n_links)
316 : :
317 : : /* Suppose we have a dependence Y between insn pro1 and con1, where pro1 has
318 : : additional dependents con0 and con2, and con1 is dependent on additional
319 : : insns pro0 and pro1:
320 : :
321 : : .con0 pro0
322 : : . ^ |
323 : : . | |
324 : : . | |
325 : : . X A
326 : : . | |
327 : : . | |
328 : : . | V
329 : : .pro1--Y-->con1
330 : : . | ^
331 : : . | |
332 : : . | |
333 : : . Z B
334 : : . | |
335 : : . | |
336 : : . V |
337 : : .con2 pro2
338 : :
339 : : This is represented using a "dep_node" for each dependence arc, which are
340 : : connected as follows (diagram is centered around Y which is fully shown;
341 : : other dep_nodes shown partially):
342 : :
343 : : . +------------+ +--------------+ +------------+
344 : : . : dep_node X : | dep_node Y | : dep_node Z :
345 : : . : : | | : :
346 : : . : : | | : :
347 : : . : forw : | forw | : forw :
348 : : . : +--------+ : | +--------+ | : +--------+ :
349 : : forw_deps : |dep_link| : | |dep_link| | : |dep_link| :
350 : : +-----+ : | +----+ | : | | +----+ | | : | +----+ | :
351 : : |first|----->| |next|-+------+->| |next|-+--+----->| |next|-+--->NULL
352 : : +-----+ : | +----+ | : | | +----+ | | : | +----+ | :
353 : : . ^ ^ : | ^ | : | | ^ | | : | | :
354 : : . | | : | | | : | | | | | : | | :
355 : : . | +--<----+--+ +--+---<--+--+--+ +--+--+--<---+--+ | :
356 : : . | : | | | : | | | | | : | | | :
357 : : . | : | +----+ | : | | +----+ | | : | +----+ | :
358 : : . | : | |prev| | : | | |prev| | | : | |prev| | :
359 : : . | : | |next| | : | | |next| | | : | |next| | :
360 : : . | : | +----+ | : | | +----+ | | : | +----+ | :
361 : : . | : | | :<-+ | | | |<-+ : | | :<-+
362 : : . | : | +----+ | : | | | +----+ | | | : | +----+ | : |
363 : : . | : | |node|-+----+ | | |node|-+--+--+ : | |node|-+----+
364 : : . | : | +----+ | : | | +----+ | | : | +----+ | :
365 : : . | : | | : | | | | : | | :
366 : : . | : +--------+ : | +--------+ | : +--------+ :
367 : : . | : : | | : :
368 : : . | : SAME pro1 : | +--------+ | : SAME pro1 :
369 : : . | : DIFF con0 : | |dep | | : DIFF con2 :
370 : : . | : : | | | | : :
371 : : . | | | +----+ | |
372 : : .RTX<------------------------+--+-|pro1| | |
373 : : .pro1 | | +----+ | |
374 : : . | | | |
375 : : . | | +----+ | |
376 : : .RTX<------------------------+--+-|con1| | |
377 : : .con1 | | +----+ | |
378 : : . | | | | |
379 : : . | | | +----+ | |
380 : : . | | | |kind| | |
381 : : . | | | +----+ | |
382 : : . | : : | | |stat| | | : :
383 : : . | : DIFF pro0 : | | +----+ | | : DIFF pro2 :
384 : : . | : SAME con1 : | | | | : SAME con1 :
385 : : . | : : | +--------+ | : :
386 : : . | : : | | : :
387 : : . | : back : | back | : back :
388 : : . v : +--------+ : | +--------+ | : +--------+ :
389 : : back_deps : |dep_link| : | |dep_link| | : |dep_link| :
390 : : +-----+ : | +----+ | : | | +----+ | | : | +----+ | :
391 : : |first|----->| |next|-+------+->| |next|-+--+----->| |next|-+--->NULL
392 : : +-----+ : | +----+ | : | | +----+ | | : | +----+ | :
393 : : . ^ : | ^ | : | | ^ | | : | | :
394 : : . | : | | | : | | | | | : | | :
395 : : . +--<----+--+ +--+---<--+--+--+ +--+--+--<---+--+ | :
396 : : . : | | | : | | | | | : | | | :
397 : : . : | +----+ | : | | +----+ | | : | +----+ | :
398 : : . : | |prev| | : | | |prev| | | : | |prev| | :
399 : : . : | |next| | : | | |next| | | : | |next| | :
400 : : . : | +----+ | : | | +----+ | | : | +----+ | :
401 : : . : | | :<-+ | | | |<-+ : | | :<-+
402 : : . : | +----+ | : | | | +----+ | | | : | +----+ | : |
403 : : . : | |node|-+----+ | | |node|-+--+--+ : | |node|-+----+
404 : : . : | +----+ | : | | +----+ | | : | +----+ | :
405 : : . : | | : | | | | : | | :
406 : : . : +--------+ : | +--------+ | : +--------+ :
407 : : . : : | | : :
408 : : . : dep_node A : | dep_node Y | : dep_node B :
409 : : . +------------+ +--------------+ +------------+
410 : : */
411 : :
412 : : struct _dep_node
413 : : {
414 : : /* Backward link. */
415 : : struct _dep_link back;
416 : :
417 : : /* The dep. */
418 : : struct _dep dep;
419 : :
420 : : /* Forward link. */
421 : : struct _dep_link forw;
422 : : };
423 : :
424 : : #define DEP_NODE_BACK(N) (&(N)->back)
425 : : #define DEP_NODE_DEP(N) (&(N)->dep)
426 : : #define DEP_NODE_FORW(N) (&(N)->forw)
427 : :
428 : : /* The following enumeration values tell us what dependencies we
429 : : should use to implement the barrier. We use true-dependencies for
430 : : TRUE_BARRIER and anti-dependencies for MOVE_BARRIER. */
431 : : enum reg_pending_barrier_mode
432 : : {
433 : : NOT_A_BARRIER = 0,
434 : : MOVE_BARRIER,
435 : : TRUE_BARRIER
436 : : };
437 : :
438 : : /* Whether a register movement is associated with a call. */
439 : : enum post_call_group
440 : : {
441 : : not_post_call,
442 : : post_call,
443 : : post_call_initial
444 : : };
445 : :
446 : : /* Insns which affect pseudo-registers. */
447 : : struct deps_reg
448 : : {
449 : : rtx_insn_list *uses;
450 : : rtx_insn_list *sets;
451 : : rtx_insn_list *implicit_sets;
452 : : rtx_insn_list *control_uses;
453 : : rtx_insn_list *clobbers;
454 : : int uses_length;
455 : : int clobbers_length;
456 : : };
457 : :
458 : : /* Describe state of dependencies used during sched_analyze phase. */
459 : 9516100 : class deps_desc
460 : : {
461 : : public:
462 : : /* The *_insns and *_mems are paired lists. Each pending memory operation
463 : : will have a pointer to the MEM rtx on one list and a pointer to the
464 : : containing insn on the other list in the same place in the list. */
465 : :
466 : : /* We can't use add_dependence like the old code did, because a single insn
467 : : may have multiple memory accesses, and hence needs to be on the list
468 : : once for each memory access. Add_dependence won't let you add an insn
469 : : to a list more than once. */
470 : :
471 : : /* An INSN_LIST containing all insns with pending read operations. */
472 : : rtx_insn_list *pending_read_insns;
473 : :
474 : : /* An EXPR_LIST containing all MEM rtx's which are pending reads. The list
475 : : can contain stack pointer instead of memory. This is a special case (see
476 : : sched-deps.cc::sched_analyze_1). */
477 : : rtx_expr_list *pending_read_mems;
478 : :
479 : : /* An INSN_LIST containing all insns with pending write operations. */
480 : : rtx_insn_list *pending_write_insns;
481 : :
482 : : /* An EXPR_LIST containing all MEM rtx's which are pending writes. */
483 : : rtx_expr_list *pending_write_mems;
484 : :
485 : : /* An INSN_LIST containing all jump insns. */
486 : : rtx_insn_list *pending_jump_insns;
487 : :
488 : : /* We must prevent the above lists from ever growing too large since
489 : : the number of dependencies produced is at least O(N*N),
490 : : and execution time is at least O(4*N*N), as a function of the
491 : : length of these pending lists. */
492 : :
493 : : /* Indicates the length of the pending_read list. */
494 : : int pending_read_list_length;
495 : :
496 : : /* Indicates the length of the pending_write list. */
497 : : int pending_write_list_length;
498 : :
499 : : /* Length of the pending memory flush list plus the length of the pending
500 : : jump insn list. Large functions with no calls may build up extremely
501 : : large lists. */
502 : : int pending_flush_length;
503 : :
504 : : /* The last insn upon which all memory references must depend.
505 : : This is an insn which flushed the pending lists, creating a dependency
506 : : between it and all previously pending memory references. This creates
507 : : a barrier (or a checkpoint) which no memory reference is allowed to cross.
508 : :
509 : : This includes all non constant CALL_INSNs. When we do interprocedural
510 : : alias analysis, this restriction can be relaxed.
511 : : This may also be an INSN that writes memory if the pending lists grow
512 : : too large. */
513 : : rtx_insn_list *last_pending_memory_flush;
514 : :
515 : : /* A list of the last function calls we have seen. We use a list to
516 : : represent last function calls from multiple predecessor blocks.
517 : : Used to prevent register lifetimes from expanding unnecessarily. */
518 : : rtx_insn_list *last_function_call;
519 : :
520 : : /* A list of the last function calls that may not return normally
521 : : we have seen. We use a list to represent last function calls from
522 : : multiple predecessor blocks. Used to prevent moving trapping insns
523 : : across such calls. */
524 : : rtx_insn_list *last_function_call_may_noreturn;
525 : :
526 : : /* A list of insns which use a pseudo register that does not already
527 : : cross a call. We create dependencies between each of those insn
528 : : and the next call insn, to ensure that they won't cross a call after
529 : : scheduling is done. */
530 : : rtx_insn_list *sched_before_next_call;
531 : :
532 : : /* Similarly, a list of insns which should not cross a branch. */
533 : : rtx_insn_list *sched_before_next_jump;
534 : :
535 : : /* Used to keep post-call pseudo/hard reg movements together with
536 : : the call. */
537 : : enum post_call_group in_post_call_group_p;
538 : :
539 : : /* The last debug insn we've seen. */
540 : : rtx_insn *last_debug_insn;
541 : :
542 : : /* The last insn bearing REG_ARGS_SIZE that we've seen. */
543 : : rtx_insn *last_args_size;
544 : :
545 : : /* A list of all prologue insns we have seen without intervening epilogue
546 : : insns, and one of all epilogue insns we have seen without intervening
547 : : prologue insns. This is used to prevent mixing prologue and epilogue
548 : : insns. See PR78029. */
549 : : rtx_insn_list *last_prologue;
550 : : rtx_insn_list *last_epilogue;
551 : :
552 : : /* Whether the last *logue insn was an epilogue insn or a prologue insn
553 : : instead. */
554 : : bool last_logue_was_epilogue;
555 : :
556 : : /* The maximum register number for the following arrays. Before reload
557 : : this is max_reg_num; after reload it is FIRST_PSEUDO_REGISTER. */
558 : : int max_reg;
559 : :
560 : : /* Element N is the next insn that sets (hard or pseudo) register
561 : : N within the current basic block; or zero, if there is no
562 : : such insn. Needed for new registers which may be introduced
563 : : by splitting insns. */
564 : : struct deps_reg *reg_last;
565 : :
566 : : /* Element N is set for each register that has any nonzero element
567 : : in reg_last[N].{uses,sets,clobbers}. */
568 : : regset_head reg_last_in_use;
569 : :
570 : : /* Shows the last value of reg_pending_barrier associated with the insn. */
571 : : enum reg_pending_barrier_mode last_reg_pending_barrier;
572 : :
573 : : /* True when this context should be treated as a readonly by
574 : : the analysis. */
575 : : BOOL_BITFIELD readonly : 1;
576 : : };
577 : :
578 : : typedef class deps_desc *deps_t;
579 : :
580 : : /* This structure holds some state of the current scheduling pass, and
581 : : contains some function pointers that abstract out some of the non-generic
582 : : functionality from functions such as schedule_block or schedule_insn.
583 : : There is one global variable, current_sched_info, which points to the
584 : : sched_info structure currently in use. */
585 : : struct haifa_sched_info
586 : : {
587 : : /* Add all insns that are initially ready to the ready list. Called once
588 : : before scheduling a set of insns. */
589 : : void (*init_ready_list) (void);
590 : : /* Called after taking an insn from the ready list. Returns true if
591 : : this insn can be scheduled, false if we should silently discard it. */
592 : : bool (*can_schedule_ready_p) (rtx_insn *);
593 : : /* Return true if there are more insns that should be scheduled. */
594 : : bool (*schedule_more_p) (void);
595 : : /* Called after an insn has all its hard dependencies resolved.
596 : : Adjusts status of instruction (which is passed through second parameter)
597 : : to indicate if instruction should be moved to the ready list or the
598 : : queue, or if it should silently discard it (until next resolved
599 : : dependence). */
600 : : ds_t (*new_ready) (rtx_insn *, ds_t);
601 : : /* Compare priority of two insns. Return a positive number if the second
602 : : insn is to be preferred for scheduling, and a negative one if the first
603 : : is to be preferred. Zero if they are equally good. */
604 : : int (*rank) (rtx_insn *, rtx_insn *);
605 : : /* Return a string that contains the insn uid and optionally anything else
606 : : necessary to identify this insn in an output. It's valid to use a
607 : : static buffer for this. The ALIGNED parameter should cause the string
608 : : to be formatted so that multiple output lines will line up nicely. */
609 : : const char *(*print_insn) (const rtx_insn *, int);
610 : : /* Return true if an insn should be included in priority
611 : : calculations. */
612 : : bool (*contributes_to_priority) (rtx_insn *, rtx_insn *);
613 : :
614 : : /* Return true if scheduling insn (passed as the parameter) will trigger
615 : : finish of scheduling current block. */
616 : : bool (*insn_finishes_block_p) (rtx_insn *);
617 : :
618 : : /* The boundaries of the set of insns to be scheduled. */
619 : : rtx_insn *prev_head, *next_tail;
620 : :
621 : : /* Filled in after the schedule is finished; the first and last scheduled
622 : : insns. */
623 : : rtx_insn *head, *tail;
624 : :
625 : : /* If nonzero, enables an additional sanity check in schedule_block. */
626 : : unsigned int queue_must_finish_empty:1;
627 : :
628 : : /* Maximum priority that has been assigned to an insn. */
629 : : int sched_max_insns_priority;
630 : :
631 : : /* Hooks to support speculative scheduling. */
632 : :
633 : : /* Called to notify frontend that instruction is being added (second
634 : : parameter == 0) or removed (second parameter == 1). */
635 : : void (*add_remove_insn) (rtx_insn *, int);
636 : :
637 : : /* Called to notify the frontend that instruction INSN is being
638 : : scheduled. */
639 : : void (*begin_schedule_ready) (rtx_insn *insn);
640 : :
641 : : /* Called to notify the frontend that an instruction INSN is about to be
642 : : moved to its correct place in the final schedule. This is done for all
643 : : insns in order of the schedule. LAST indicates the last scheduled
644 : : instruction. */
645 : : void (*begin_move_insn) (rtx_insn *insn, rtx_insn *last);
646 : :
647 : : /* If the second parameter is not NULL, return nonnull value, if the
648 : : basic block should be advanced.
649 : : If the second parameter is NULL, return the next basic block in EBB.
650 : : The first parameter is the current basic block in EBB. */
651 : : basic_block (*advance_target_bb) (basic_block, rtx_insn *);
652 : :
653 : : /* Allocate memory, store the frontend scheduler state in it, and
654 : : return it. */
655 : : void *(*save_state) (void);
656 : : /* Restore frontend scheduler state from the argument, and free the
657 : : memory. */
658 : : void (*restore_state) (void *);
659 : :
660 : : /* ??? FIXME: should use straight bitfields inside sched_info instead of
661 : : this flag field. */
662 : : unsigned int flags;
663 : : };
664 : :
665 : : /* This structure holds description of the properties for speculative
666 : : scheduling. */
667 : : struct spec_info_def
668 : : {
669 : : /* Holds types of allowed speculations: BEGIN_{DATA|CONTROL},
670 : : BE_IN_{DATA_CONTROL}. */
671 : : int mask;
672 : :
673 : : /* A dump file for additional information on speculative scheduling. */
674 : : FILE *dump;
675 : :
676 : : /* Minimal cumulative weakness of speculative instruction's
677 : : dependencies, so that insn will be scheduled. */
678 : : dw_t data_weakness_cutoff;
679 : :
680 : : /* Minimal usefulness of speculative instruction to be considered for
681 : : scheduling. */
682 : : int control_weakness_cutoff;
683 : :
684 : : /* Flags from the enum SPEC_SCHED_FLAGS. */
685 : : int flags;
686 : : };
687 : : typedef struct spec_info_def *spec_info_t;
688 : :
689 : : extern spec_info_t spec_info;
690 : :
691 : : extern struct haifa_sched_info *current_sched_info;
692 : :
693 : : /* Do register pressure sensitive insn scheduling if the flag is set
694 : : up. */
695 : : extern enum sched_pressure_algorithm sched_pressure;
696 : :
697 : : /* Map regno -> its pressure class. The map defined only when
698 : : SCHED_PRESSURE_P is true. */
699 : : extern enum reg_class *sched_regno_pressure_class;
700 : :
701 : : /* Indexed by INSN_UID, the collection of all data associated with
702 : : a single instruction. */
703 : :
704 : : struct _haifa_deps_insn_data
705 : : {
706 : : /* The number of incoming edges in the forward dependency graph.
707 : : As scheduling proceeds, counts are decreased. An insn moves to
708 : : the ready queue when its counter reaches zero. */
709 : : int dep_count;
710 : :
711 : : /* Nonzero if instruction has internal dependence
712 : : (e.g. add_dependence was invoked with (insn == elem)). */
713 : : unsigned int has_internal_dep;
714 : :
715 : : /* NB: We can't place 'struct _deps_list' here instead of deps_list_t into
716 : : h_i_d because when h_i_d extends, addresses of the deps_list->first
717 : : change without updating deps_list->first->next->prev_nextp. Thus
718 : : BACK_DEPS and RESOLVED_BACK_DEPS are allocated on the heap and FORW_DEPS
719 : : list is allocated on the obstack. */
720 : :
721 : : /* A list of hard backward dependencies. The insn is a consumer of all the
722 : : deps mentioned here. */
723 : : deps_list_t hard_back_deps;
724 : :
725 : : /* A list of speculative (weak) dependencies. The insn is a consumer of all
726 : : the deps mentioned here. */
727 : : deps_list_t spec_back_deps;
728 : :
729 : : /* A list of insns which depend on the instruction. Unlike 'back_deps',
730 : : it represents forward dependencies. */
731 : : deps_list_t forw_deps;
732 : :
733 : : /* A list of scheduled producers of the instruction. Links are being moved
734 : : from 'back_deps' to 'resolved_back_deps' while scheduling. */
735 : : deps_list_t resolved_back_deps;
736 : :
737 : : /* A list of scheduled consumers of the instruction. Links are being moved
738 : : from 'forw_deps' to 'resolved_forw_deps' while scheduling to fasten the
739 : : search in 'forw_deps'. */
740 : : deps_list_t resolved_forw_deps;
741 : :
742 : : /* If the insn is conditional (either through COND_EXEC, or because
743 : : it is a conditional branch), this records the condition. NULL
744 : : for insns that haven't been seen yet or don't have a condition;
745 : : const_true_rtx to mark an insn without a condition, or with a
746 : : condition that has been clobbered by a subsequent insn. */
747 : : rtx cond;
748 : :
749 : : /* For a conditional insn, a list of insns that could set the condition
750 : : register. Used when generating control dependencies. */
751 : : rtx_insn_list *cond_deps;
752 : :
753 : : /* True if the condition in 'cond' should be reversed to get the actual
754 : : condition. */
755 : : unsigned int reverse_cond : 1;
756 : :
757 : : /* Some insns (e.g. call) are not allowed to move across blocks. */
758 : : unsigned int cant_move : 1;
759 : : };
760 : :
761 : :
762 : : /* Bits used for storing values of the fields in the following
763 : : structure. */
764 : : #define INCREASE_BITS 8
765 : :
766 : : /* The structure describes how the corresponding insn increases the
767 : : register pressure for each pressure class. */
768 : : struct reg_pressure_data
769 : : {
770 : : /* Pressure increase for given class because of clobber. */
771 : : unsigned int clobber_increase : INCREASE_BITS;
772 : : /* Increase in register pressure for given class because of register
773 : : sets. */
774 : : unsigned int set_increase : INCREASE_BITS;
775 : : /* Pressure increase for given class because of unused register
776 : : set. */
777 : : unsigned int unused_set_increase : INCREASE_BITS;
778 : : /* Pressure change: #sets - #deaths. */
779 : : int change : INCREASE_BITS;
780 : : };
781 : :
782 : : /* The following structure describes usage of registers by insns. */
783 : : struct reg_use_data
784 : : {
785 : : /* Regno used in the insn. */
786 : : int regno;
787 : : /* Insn using the regno. */
788 : : rtx_insn *insn;
789 : : /* Cyclic list of elements with the same regno. */
790 : : struct reg_use_data *next_regno_use;
791 : : /* List of elements with the same insn. */
792 : : struct reg_use_data *next_insn_use;
793 : : };
794 : :
795 : : /* The following structure describes used sets of registers by insns.
796 : : Registers are pseudos whose pressure class is not NO_REGS or hard
797 : : registers available for allocations. */
798 : : struct reg_set_data
799 : : {
800 : : /* Regno used in the insn. */
801 : : int regno;
802 : : /* Insn setting the regno. */
803 : : rtx insn;
804 : : /* List of elements with the same insn. */
805 : : struct reg_set_data *next_insn_set;
806 : : };
807 : :
808 : : enum autopref_multipass_data_status {
809 : : /* Entry is irrelevant for auto-prefetcher. */
810 : : AUTOPREF_MULTIPASS_DATA_IRRELEVANT = -2,
811 : : /* Entry is uninitialized. */
812 : : AUTOPREF_MULTIPASS_DATA_UNINITIALIZED = -1,
813 : : /* Entry is relevant for auto-prefetcher and insn can be delayed
814 : : to allow another insn through. */
815 : : AUTOPREF_MULTIPASS_DATA_NORMAL = 0,
816 : : /* Entry is relevant for auto-prefetcher, but insn should not be
817 : : delayed as that will break scheduling. */
818 : : AUTOPREF_MULTIPASS_DATA_DONT_DELAY = 1
819 : : };
820 : :
821 : : /* Data for modeling cache auto-prefetcher. */
822 : : struct autopref_multipass_data_
823 : : {
824 : : /* Base part of memory address. */
825 : : rtx base;
826 : :
827 : : /* Memory offsets from the base. */
828 : : int offset;
829 : :
830 : : /* Entry status. */
831 : : enum autopref_multipass_data_status status;
832 : : };
833 : : typedef struct autopref_multipass_data_ autopref_multipass_data_def;
834 : : typedef autopref_multipass_data_def *autopref_multipass_data_t;
835 : :
836 : : struct _haifa_insn_data
837 : : {
838 : : /* We can't place 'struct _deps_list' into h_i_d instead of deps_list_t
839 : : because when h_i_d extends, addresses of the deps_list->first
840 : : change without updating deps_list->first->next->prev_nextp. */
841 : :
842 : : /* Logical uid gives the original ordering of the insns. */
843 : : int luid;
844 : :
845 : : /* A priority for each insn. */
846 : : int priority;
847 : :
848 : : /* The fusion priority for each insn. */
849 : : int fusion_priority;
850 : :
851 : : /* The minimum clock tick at which the insn becomes ready. This is
852 : : used to note timing constraints for the insns in the pending list. */
853 : : int tick;
854 : :
855 : : /* For insns that are scheduled at a fixed difference from another,
856 : : this records the tick in which they must be ready. */
857 : : int exact_tick;
858 : :
859 : : /* INTER_TICK is used to adjust INSN_TICKs of instructions from the
860 : : subsequent blocks in a region. */
861 : : int inter_tick;
862 : :
863 : : /* Used temporarily to estimate an INSN_TICK value for an insn given
864 : : current knowledge. */
865 : : int tick_estimate;
866 : :
867 : : /* See comment on QUEUE_INDEX macro in haifa-sched.cc. */
868 : : int queue_index;
869 : :
870 : : short cost;
871 : :
872 : : /* '> 0' if priority is valid,
873 : : '== 0' if priority was not yet computed,
874 : : '< 0' if priority in invalid and should be recomputed. */
875 : : signed char priority_status;
876 : :
877 : : /* Set if there's DEF-USE dependence between some speculatively
878 : : moved load insn and this one. */
879 : : unsigned int fed_by_spec_load : 1;
880 : : unsigned int is_load_insn : 1;
881 : : /* Nonzero if this insn has negative-cost forward dependencies against
882 : : an already scheduled insn. */
883 : : unsigned int feeds_backtrack_insn : 1;
884 : :
885 : : /* Nonzero if this insn is a shadow of another, scheduled after a fixed
886 : : delay. We only emit shadows at the end of a cycle, with no other
887 : : real insns following them. */
888 : : unsigned int shadow_p : 1;
889 : :
890 : : /* Used internally in unschedule_insns_until to mark insns that must have
891 : : their TODO_SPEC recomputed. */
892 : : unsigned int must_recompute_spec : 1;
893 : :
894 : : /* What speculations are necessary to apply to schedule the instruction. */
895 : : ds_t todo_spec;
896 : :
897 : : /* What speculations were already applied. */
898 : : ds_t done_spec;
899 : :
900 : : /* What speculations are checked by this instruction. */
901 : : ds_t check_spec;
902 : :
903 : : /* Recovery block for speculation checks. */
904 : : basic_block recovery_block;
905 : :
906 : : /* Original pattern of the instruction. */
907 : : rtx orig_pat;
908 : :
909 : : /* For insns with DEP_CONTROL dependencies, the predicated pattern if it
910 : : was ever successfully constructed. */
911 : : rtx predicated_pat;
912 : :
913 : : /* The following array contains info how the insn increases register
914 : : pressure. There is an element for each cover class of pseudos
915 : : referenced in insns. */
916 : : struct reg_pressure_data *reg_pressure;
917 : : /* The following array contains maximal reg pressure between last
918 : : scheduled insn and given insn. There is an element for each
919 : : pressure class of pseudos referenced in insns. This info updated
920 : : after scheduling each insn for each insn between the two
921 : : mentioned insns. */
922 : : int *max_reg_pressure;
923 : : /* The following list contains info about used pseudos and hard
924 : : registers available for allocation. */
925 : : struct reg_use_data *reg_use_list;
926 : : /* The following list contains info about set pseudos and hard
927 : : registers available for allocation. */
928 : : struct reg_set_data *reg_set_list;
929 : : /* Info about how scheduling the insn changes cost of register
930 : : pressure excess (between source and target). */
931 : : int reg_pressure_excess_cost_change;
932 : : int model_index;
933 : :
934 : : /* Original order of insns in the ready list. */
935 : : int rfs_debug_orig_order;
936 : :
937 : : /* The deciding reason for INSN's place in the ready list. */
938 : : int last_rfs_win;
939 : :
940 : : /* Two entries for cache auto-prefetcher model: one for mem reads,
941 : : and one for mem writes. */
942 : : autopref_multipass_data_def autopref_multipass_data[2];
943 : : };
944 : :
945 : : typedef struct _haifa_insn_data haifa_insn_data_def;
946 : : typedef haifa_insn_data_def *haifa_insn_data_t;
947 : :
948 : :
949 : : extern vec<haifa_insn_data_def> h_i_d;
950 : :
951 : : #define HID(INSN) (&h_i_d[INSN_UID (INSN)])
952 : :
953 : : /* Accessor macros for h_i_d. There are more in haifa-sched.cc and
954 : : sched-rgn.cc. */
955 : : #define INSN_PRIORITY(INSN) (HID (INSN)->priority)
956 : : #define INSN_FUSION_PRIORITY(INSN) (HID (INSN)->fusion_priority)
957 : : #define INSN_REG_PRESSURE(INSN) (HID (INSN)->reg_pressure)
958 : : #define INSN_MAX_REG_PRESSURE(INSN) (HID (INSN)->max_reg_pressure)
959 : : #define INSN_REG_USE_LIST(INSN) (HID (INSN)->reg_use_list)
960 : : #define INSN_REG_SET_LIST(INSN) (HID (INSN)->reg_set_list)
961 : : #define INSN_REG_PRESSURE_EXCESS_COST_CHANGE(INSN) \
962 : : (HID (INSN)->reg_pressure_excess_cost_change)
963 : : #define INSN_PRIORITY_STATUS(INSN) (HID (INSN)->priority_status)
964 : : #define INSN_MODEL_INDEX(INSN) (HID (INSN)->model_index)
965 : : #define INSN_AUTOPREF_MULTIPASS_DATA(INSN) \
966 : : (HID (INSN)->autopref_multipass_data)
967 : :
968 : : typedef struct _haifa_deps_insn_data haifa_deps_insn_data_def;
969 : : typedef haifa_deps_insn_data_def *haifa_deps_insn_data_t;
970 : :
971 : :
972 : : extern vec<haifa_deps_insn_data_def> h_d_i_d;
973 : :
974 : : #define HDID(INSN) (&h_d_i_d[INSN_LUID (INSN)])
975 : : #define INSN_DEP_COUNT(INSN) (HDID (INSN)->dep_count)
976 : : #define HAS_INTERNAL_DEP(INSN) (HDID (INSN)->has_internal_dep)
977 : : #define INSN_FORW_DEPS(INSN) (HDID (INSN)->forw_deps)
978 : : #define INSN_RESOLVED_BACK_DEPS(INSN) (HDID (INSN)->resolved_back_deps)
979 : : #define INSN_RESOLVED_FORW_DEPS(INSN) (HDID (INSN)->resolved_forw_deps)
980 : : #define INSN_HARD_BACK_DEPS(INSN) (HDID (INSN)->hard_back_deps)
981 : : #define INSN_SPEC_BACK_DEPS(INSN) (HDID (INSN)->spec_back_deps)
982 : : #define INSN_CACHED_COND(INSN) (HDID (INSN)->cond)
983 : : #define INSN_REVERSE_COND(INSN) (HDID (INSN)->reverse_cond)
984 : : #define INSN_COND_DEPS(INSN) (HDID (INSN)->cond_deps)
985 : : #define CANT_MOVE(INSN) (HDID (INSN)->cant_move)
986 : : #define CANT_MOVE_BY_LUID(LUID) (h_d_i_d[LUID].cant_move)
987 : :
988 : :
989 : : #define INSN_PRIORITY(INSN) (HID (INSN)->priority)
990 : : #define INSN_PRIORITY_STATUS(INSN) (HID (INSN)->priority_status)
991 : : #define INSN_PRIORITY_KNOWN(INSN) (INSN_PRIORITY_STATUS (INSN) > 0)
992 : : #define TODO_SPEC(INSN) (HID (INSN)->todo_spec)
993 : : #define DONE_SPEC(INSN) (HID (INSN)->done_spec)
994 : : #define CHECK_SPEC(INSN) (HID (INSN)->check_spec)
995 : : #define RECOVERY_BLOCK(INSN) (HID (INSN)->recovery_block)
996 : : #define ORIG_PAT(INSN) (HID (INSN)->orig_pat)
997 : : #define PREDICATED_PAT(INSN) (HID (INSN)->predicated_pat)
998 : :
999 : : /* INSN is either a simple or a branchy speculation check. */
1000 : : #define IS_SPECULATION_CHECK_P(INSN) \
1001 : : (sel_sched_p () ? sel_insn_is_speculation_check (INSN) : RECOVERY_BLOCK (INSN) != NULL)
1002 : :
1003 : : /* INSN is a speculation check that will simply reexecute the speculatively
1004 : : scheduled instruction if the speculation fails. */
1005 : : #define IS_SPECULATION_SIMPLE_CHECK_P(INSN) \
1006 : : (RECOVERY_BLOCK (INSN) == EXIT_BLOCK_PTR_FOR_FN (cfun))
1007 : :
1008 : : /* INSN is a speculation check that will branch to RECOVERY_BLOCK if the
1009 : : speculation fails. Insns in that block will reexecute the speculatively
1010 : : scheduled code and then will return immediately after INSN thus preserving
1011 : : semantics of the program. */
1012 : : #define IS_SPECULATION_BRANCHY_CHECK_P(INSN) \
1013 : : (RECOVERY_BLOCK (INSN) != NULL \
1014 : : && RECOVERY_BLOCK (INSN) != EXIT_BLOCK_PTR_FOR_FN (cfun))
1015 : :
1016 : :
1017 : : /* Dep status (aka ds_t) of the link encapsulates all information for a given
1018 : : dependency, including everything that is needed for speculative scheduling.
1019 : :
1020 : : The lay-out of a ds_t is as follows:
1021 : :
1022 : : 1. Integers corresponding to the probability of the dependence to *not*
1023 : : exist. This is the probability that overcoming this dependence will
1024 : : not be followed by execution of the recovery code. Note that however
1025 : : high this probability is, the recovery code should still always be
1026 : : generated to preserve semantics of the program.
1027 : :
1028 : : The probability values can be set or retrieved using the functions
1029 : : the set_dep_weak() and get_dep_weak() in sched-deps.cc. The values
1030 : : are always in the range [0, MAX_DEP_WEAK].
1031 : :
1032 : : BEGIN_DATA : BITS_PER_DEP_WEAK
1033 : : BE_IN_DATA : BITS_PER_DEP_WEAK
1034 : : BEGIN_CONTROL : BITS_PER_DEP_WEAK
1035 : : BE_IN_CONTROL : BITS_PER_DEP_WEAK
1036 : :
1037 : : The basic type of DS_T is a host int. For a 32-bits int, the values
1038 : : will each take 6 bits.
1039 : :
1040 : : 2. The type of dependence. This supercedes the old-style REG_NOTE_KIND
1041 : : values. TODO: Use this field instead of DEP_TYPE, or make DEP_TYPE
1042 : : extract the dependence type from here.
1043 : :
1044 : : dep_type : 4 => DEP_{TRUE|OUTPUT|ANTI|CONTROL}
1045 : :
1046 : : 3. Various flags:
1047 : :
1048 : : HARD_DEP : 1 => Set if an instruction has a non-speculative
1049 : : dependence. This is an instruction property
1050 : : so this bit can only appear in the TODO_SPEC
1051 : : field of an instruction.
1052 : : DEP_POSTPONED : 1 => Like HARD_DEP, but the hard dependence may
1053 : : still be broken by adjusting the instruction.
1054 : : DEP_CANCELLED : 1 => Set if a dependency has been broken using
1055 : : some form of speculation.
1056 : : RESERVED : 1 => Reserved for use in the delay slot scheduler.
1057 : :
1058 : : See also: check_dep_status () in sched-deps.cc . */
1059 : :
1060 : : /* The number of bits per weakness probability. There are 4 weakness types
1061 : : and we need 8 bits for other data in a DS_T. */
1062 : : #define BITS_PER_DEP_WEAK ((BITS_PER_DEP_STATUS - 8) / 4)
1063 : :
1064 : : /* Mask of speculative weakness in dep_status. */
1065 : : #define DEP_WEAK_MASK ((1 << BITS_PER_DEP_WEAK) - 1)
1066 : :
1067 : : /* This constant means that dependence is fake with 99.999...% probability.
1068 : : This is the maximum value, that can appear in dep_status.
1069 : : Note, that we don't want MAX_DEP_WEAK to be the same as DEP_WEAK_MASK for
1070 : : debugging reasons. Though, it can be set to DEP_WEAK_MASK, and, when
1071 : : done so, we'll get fast (mul for)/(div by) NO_DEP_WEAK. */
1072 : : #define MAX_DEP_WEAK (DEP_WEAK_MASK - 1)
1073 : :
1074 : : /* This constant means that dependence is 99.999...% real and it is a really
1075 : : bad idea to overcome it (though this can be done, preserving program
1076 : : semantics). */
1077 : : #define MIN_DEP_WEAK 1
1078 : :
1079 : : /* This constant represents 100% probability.
1080 : : E.g. it is used to represent weakness of dependence, that doesn't exist.
1081 : : This value never appears in a ds_t, it is only used for computing the
1082 : : weakness of a dependence. */
1083 : : #define NO_DEP_WEAK (MAX_DEP_WEAK + MIN_DEP_WEAK)
1084 : :
1085 : : /* Default weakness of speculative dependence. Used when we can't say
1086 : : neither bad nor good about the dependence. */
1087 : : #define UNCERTAIN_DEP_WEAK (MAX_DEP_WEAK - MAX_DEP_WEAK / 4)
1088 : :
1089 : : /* Offset for speculative weaknesses in dep_status. */
1090 : : enum SPEC_TYPES_OFFSETS {
1091 : : BEGIN_DATA_BITS_OFFSET = 0,
1092 : : BE_IN_DATA_BITS_OFFSET = BEGIN_DATA_BITS_OFFSET + BITS_PER_DEP_WEAK,
1093 : : BEGIN_CONTROL_BITS_OFFSET = BE_IN_DATA_BITS_OFFSET + BITS_PER_DEP_WEAK,
1094 : : BE_IN_CONTROL_BITS_OFFSET = BEGIN_CONTROL_BITS_OFFSET + BITS_PER_DEP_WEAK
1095 : : };
1096 : :
1097 : : /* The following defines provide numerous constants used to distinguish
1098 : : between different types of speculative dependencies. They are also
1099 : : used as masks to clear/preserve the bits corresponding to the type
1100 : : of dependency weakness. */
1101 : :
1102 : : /* Dependence can be overcome with generation of new data speculative
1103 : : instruction. */
1104 : : #define BEGIN_DATA (((ds_t) DEP_WEAK_MASK) << BEGIN_DATA_BITS_OFFSET)
1105 : :
1106 : : /* This dependence is to the instruction in the recovery block, that was
1107 : : formed to recover after data-speculation failure.
1108 : : Thus, this dependence can overcome with generating of the copy of
1109 : : this instruction in the recovery block. */
1110 : : #define BE_IN_DATA (((ds_t) DEP_WEAK_MASK) << BE_IN_DATA_BITS_OFFSET)
1111 : :
1112 : : /* Dependence can be overcome with generation of new control speculative
1113 : : instruction. */
1114 : : #define BEGIN_CONTROL (((ds_t) DEP_WEAK_MASK) << BEGIN_CONTROL_BITS_OFFSET)
1115 : :
1116 : : /* This dependence is to the instruction in the recovery block, that was
1117 : : formed to recover after control-speculation failure.
1118 : : Thus, this dependence can be overcome with generating of the copy of
1119 : : this instruction in the recovery block. */
1120 : : #define BE_IN_CONTROL (((ds_t) DEP_WEAK_MASK) << BE_IN_CONTROL_BITS_OFFSET)
1121 : :
1122 : : /* A few convenient combinations. */
1123 : : #define BEGIN_SPEC (BEGIN_DATA | BEGIN_CONTROL)
1124 : : #define DATA_SPEC (BEGIN_DATA | BE_IN_DATA)
1125 : : #define CONTROL_SPEC (BEGIN_CONTROL | BE_IN_CONTROL)
1126 : : #define SPECULATIVE (DATA_SPEC | CONTROL_SPEC)
1127 : : #define BE_IN_SPEC (BE_IN_DATA | BE_IN_CONTROL)
1128 : :
1129 : : /* Constants, that are helpful in iterating through dep_status. */
1130 : : #define FIRST_SPEC_TYPE BEGIN_DATA
1131 : : #define LAST_SPEC_TYPE BE_IN_CONTROL
1132 : : #define SPEC_TYPE_SHIFT BITS_PER_DEP_WEAK
1133 : :
1134 : : /* Dependence on instruction can be of multiple types
1135 : : (e.g. true and output). This fields enhance REG_NOTE_KIND information
1136 : : of the dependence. */
1137 : : #define DEP_TRUE (((ds_t) 1) << (BE_IN_CONTROL_BITS_OFFSET + BITS_PER_DEP_WEAK))
1138 : : #define DEP_OUTPUT (DEP_TRUE << 1)
1139 : : #define DEP_ANTI (DEP_OUTPUT << 1)
1140 : : #define DEP_CONTROL (DEP_ANTI << 1)
1141 : :
1142 : : #define DEP_TYPES (DEP_TRUE | DEP_OUTPUT | DEP_ANTI | DEP_CONTROL)
1143 : :
1144 : : /* Instruction has non-speculative dependence. This bit represents the
1145 : : property of an instruction - not the one of a dependence.
1146 : : Therefore, it can appear only in the TODO_SPEC field of an instruction. */
1147 : : #define HARD_DEP (DEP_CONTROL << 1)
1148 : :
1149 : : /* Like HARD_DEP, but dependencies can perhaps be broken by modifying
1150 : : the instructions. This is used for example to change:
1151 : :
1152 : : rn++ => rm=[rn + 4]
1153 : : rm=[rn] rn++
1154 : :
1155 : : For instructions that have this bit set, one of the dependencies of
1156 : : the instructions will have a non-NULL REPLACE field in its DEP_T.
1157 : : Just like HARD_DEP, this bit is only ever set in TODO_SPEC. */
1158 : : #define DEP_POSTPONED (HARD_DEP << 1)
1159 : :
1160 : : /* Set if a dependency is cancelled via speculation. */
1161 : : #define DEP_CANCELLED (DEP_POSTPONED << 1)
1162 : :
1163 : :
1164 : : /* This represents the results of calling sched-deps.cc functions,
1165 : : which modify dependencies. */
1166 : : enum DEPS_ADJUST_RESULT {
1167 : : /* No dependence needed (e.g. producer == consumer). */
1168 : : DEP_NODEP,
1169 : : /* Dependence is already present and wasn't modified. */
1170 : : DEP_PRESENT,
1171 : : /* Existing dependence was modified to include additional information. */
1172 : : DEP_CHANGED,
1173 : : /* New dependence has been created. */
1174 : : DEP_CREATED
1175 : : };
1176 : :
1177 : : /* Represents the bits that can be set in the flags field of the
1178 : : sched_info structure. */
1179 : : enum SCHED_FLAGS {
1180 : : /* If set, generate links between instruction as DEPS_LIST.
1181 : : Otherwise, generate usual INSN_LIST links. */
1182 : : USE_DEPS_LIST = 1,
1183 : : /* Perform data or control (or both) speculation.
1184 : : Results in generation of data and control speculative dependencies.
1185 : : Requires USE_DEPS_LIST set. */
1186 : : DO_SPECULATION = USE_DEPS_LIST << 1,
1187 : : DO_BACKTRACKING = DO_SPECULATION << 1,
1188 : : DO_PREDICATION = DO_BACKTRACKING << 1,
1189 : : DONT_BREAK_DEPENDENCIES = DO_PREDICATION << 1,
1190 : : SCHED_RGN = DONT_BREAK_DEPENDENCIES << 1,
1191 : : SCHED_EBB = SCHED_RGN << 1,
1192 : : /* Scheduler can possibly create new basic blocks. Used for assertions. */
1193 : : NEW_BBS = SCHED_EBB << 1,
1194 : : SEL_SCHED = NEW_BBS << 1
1195 : : };
1196 : :
1197 : : enum SPEC_SCHED_FLAGS {
1198 : : COUNT_SPEC_IN_CRITICAL_PATH = 1,
1199 : : SEL_SCHED_SPEC_DONT_CHECK_CONTROL = COUNT_SPEC_IN_CRITICAL_PATH << 1
1200 : : };
1201 : :
1202 : : #define NOTE_NOT_BB_P(NOTE) (NOTE_P (NOTE) && (NOTE_KIND (NOTE) \
1203 : : != NOTE_INSN_BASIC_BLOCK))
1204 : :
1205 : : extern FILE *sched_dump;
1206 : : extern int sched_verbose;
1207 : :
1208 : : extern spec_info_t spec_info;
1209 : : extern bool haifa_recovery_bb_ever_added_p;
1210 : :
1211 : : /* Exception Free Loads:
1212 : :
1213 : : We define five classes of speculative loads: IFREE, IRISKY,
1214 : : PFREE, PRISKY, and MFREE.
1215 : :
1216 : : IFREE loads are loads that are proved to be exception-free, just
1217 : : by examining the load insn. Examples for such loads are loads
1218 : : from TOC and loads of global data.
1219 : :
1220 : : IRISKY loads are loads that are proved to be exception-risky,
1221 : : just by examining the load insn. Examples for such loads are
1222 : : volatile loads and loads from shared memory.
1223 : :
1224 : : PFREE loads are loads for which we can prove, by examining other
1225 : : insns, that they are exception-free. Currently, this class consists
1226 : : of loads for which we are able to find a "similar load", either in
1227 : : the target block, or, if only one split-block exists, in that split
1228 : : block. Load2 is similar to load1 if both have same single base
1229 : : register. We identify only part of the similar loads, by finding
1230 : : an insn upon which both load1 and load2 have a DEF-USE dependence.
1231 : :
1232 : : PRISKY loads are loads for which we can prove, by examining other
1233 : : insns, that they are exception-risky. Currently we have two proofs for
1234 : : such loads. The first proof detects loads that are probably guarded by a
1235 : : test on the memory address. This proof is based on the
1236 : : backward and forward data dependence information for the region.
1237 : : Let load-insn be the examined load.
1238 : : Load-insn is PRISKY iff ALL the following hold:
1239 : :
1240 : : - insn1 is not in the same block as load-insn
1241 : : - there is a DEF-USE dependence chain (insn1, ..., load-insn)
1242 : : - test-insn is either a compare or a branch, not in the same block
1243 : : as load-insn
1244 : : - load-insn is reachable from test-insn
1245 : : - there is a DEF-USE dependence chain (insn1, ..., test-insn)
1246 : :
1247 : : This proof might fail when the compare and the load are fed
1248 : : by an insn not in the region. To solve this, we will add to this
1249 : : group all loads that have no input DEF-USE dependence.
1250 : :
1251 : : The second proof detects loads that are directly or indirectly
1252 : : fed by a speculative load. This proof is affected by the
1253 : : scheduling process. We will use the flag fed_by_spec_load.
1254 : : Initially, all insns have this flag reset. After a speculative
1255 : : motion of an insn, if insn is either a load, or marked as
1256 : : fed_by_spec_load, we will also mark as fed_by_spec_load every
1257 : : insn1 for which a DEF-USE dependence (insn, insn1) exists. A
1258 : : load which is fed_by_spec_load is also PRISKY.
1259 : :
1260 : : MFREE (maybe-free) loads are all the remaining loads. They may be
1261 : : exception-free, but we cannot prove it.
1262 : :
1263 : : Now, all loads in IFREE and PFREE classes are considered
1264 : : exception-free, while all loads in IRISKY and PRISKY classes are
1265 : : considered exception-risky. As for loads in the MFREE class,
1266 : : these are considered either exception-free or exception-risky,
1267 : : depending on whether we are pessimistic or optimistic. We have
1268 : : to take the pessimistic approach to assure the safety of
1269 : : speculative scheduling, but we can take the optimistic approach
1270 : : by invoking the -fsched_spec_load_dangerous option. */
1271 : :
1272 : : enum INSN_TRAP_CLASS
1273 : : {
1274 : : TRAP_FREE = 0, IFREE = 1, PFREE_CANDIDATE = 2,
1275 : : PRISKY_CANDIDATE = 3, IRISKY = 4, TRAP_RISKY = 5
1276 : : };
1277 : :
1278 : : #define WORST_CLASS(class1, class2) \
1279 : : ((class1 > class2) ? class1 : class2)
1280 : :
1281 : : #ifndef __GNUC__
1282 : : #define __inline
1283 : : #endif
1284 : :
1285 : : #ifndef HAIFA_INLINE
1286 : : #define HAIFA_INLINE __inline
1287 : : #endif
1288 : :
1289 : : struct sched_deps_info_def
1290 : : {
1291 : : /* Called when computing dependencies for a JUMP_INSN. This function
1292 : : should store the set of registers that must be considered as set by
1293 : : the jump in the regset. */
1294 : : void (*compute_jump_reg_dependencies) (rtx, regset);
1295 : :
1296 : : /* Start analyzing insn. */
1297 : : void (*start_insn) (rtx_insn *);
1298 : :
1299 : : /* Finish analyzing insn. */
1300 : : void (*finish_insn) (void);
1301 : :
1302 : : /* Start analyzing insn LHS (Left Hand Side). */
1303 : : void (*start_lhs) (rtx);
1304 : :
1305 : : /* Finish analyzing insn LHS. */
1306 : : void (*finish_lhs) (void);
1307 : :
1308 : : /* Start analyzing insn RHS (Right Hand Side). */
1309 : : void (*start_rhs) (rtx);
1310 : :
1311 : : /* Finish analyzing insn RHS. */
1312 : : void (*finish_rhs) (void);
1313 : :
1314 : : /* Note set of the register. */
1315 : : void (*note_reg_set) (int);
1316 : :
1317 : : /* Note clobber of the register. */
1318 : : void (*note_reg_clobber) (int);
1319 : :
1320 : : /* Note use of the register. */
1321 : : void (*note_reg_use) (int);
1322 : :
1323 : : /* Note memory dependence of type DS between MEM1 and MEM2 (which is
1324 : : in the INSN2). */
1325 : : void (*note_mem_dep) (rtx mem1, rtx mem2, rtx_insn *insn2, ds_t ds);
1326 : :
1327 : : /* Note a dependence of type DS from the INSN. */
1328 : : void (*note_dep) (rtx_insn *, ds_t ds);
1329 : :
1330 : : /* Nonzero if we should use cselib for better alias analysis. This
1331 : : must be 0 if the dependency information is used after sched_analyze
1332 : : has completed, e.g. if we're using it to initialize state for successor
1333 : : blocks in region scheduling. */
1334 : : unsigned int use_cselib : 1;
1335 : :
1336 : : /* If set, generate links between instruction as DEPS_LIST.
1337 : : Otherwise, generate usual INSN_LIST links. */
1338 : : unsigned int use_deps_list : 1;
1339 : :
1340 : : /* Generate data and control speculative dependencies.
1341 : : Requires USE_DEPS_LIST set. */
1342 : : unsigned int generate_spec_deps : 1;
1343 : : };
1344 : :
1345 : : extern struct sched_deps_info_def *sched_deps_info;
1346 : :
1347 : :
1348 : : /* Functions in sched-deps.cc. */
1349 : : extern rtx sched_get_reverse_condition_uncached (const rtx_insn *);
1350 : : extern bool sched_insns_conditions_mutex_p (const rtx_insn *,
1351 : : const rtx_insn *);
1352 : : extern bool sched_insn_is_legitimate_for_speculation_p (const rtx_insn *, ds_t);
1353 : : extern void add_dependence (rtx_insn *, rtx_insn *, enum reg_note);
1354 : : extern void sched_analyze (class deps_desc *, rtx_insn *, rtx_insn *);
1355 : : extern void init_deps (class deps_desc *, bool);
1356 : : extern void init_deps_reg_last (class deps_desc *);
1357 : : extern void free_deps (class deps_desc *);
1358 : : extern void init_deps_global (void);
1359 : : extern void finish_deps_global (void);
1360 : : extern void deps_analyze_insn (class deps_desc *, rtx_insn *);
1361 : : extern void remove_from_deps (class deps_desc *, rtx_insn *);
1362 : : extern void init_insn_reg_pressure_info (rtx_insn *);
1363 : : extern void get_implicit_reg_pending_clobbers (HARD_REG_SET *, rtx_insn *);
1364 : :
1365 : : extern dw_t get_dep_weak (ds_t, ds_t);
1366 : : extern ds_t set_dep_weak (ds_t, ds_t, dw_t);
1367 : : extern dw_t estimate_dep_weak (rtx, rtx);
1368 : : extern ds_t ds_merge (ds_t, ds_t);
1369 : : extern ds_t ds_full_merge (ds_t, ds_t, rtx, rtx);
1370 : : extern ds_t ds_max_merge (ds_t, ds_t);
1371 : : extern dw_t ds_weak (ds_t);
1372 : : extern ds_t ds_get_speculation_types (ds_t);
1373 : : extern ds_t ds_get_max_dep_weak (ds_t);
1374 : :
1375 : : extern void sched_deps_init (bool);
1376 : : extern void sched_deps_finish (void);
1377 : :
1378 : : extern void haifa_note_reg_set (int);
1379 : : extern void haifa_note_reg_clobber (int);
1380 : : extern void haifa_note_reg_use (int);
1381 : :
1382 : : extern void maybe_extend_reg_info_p (void);
1383 : :
1384 : : extern void deps_start_bb (class deps_desc *, rtx_insn *);
1385 : : extern enum reg_note ds_to_dt (ds_t);
1386 : :
1387 : : extern bool deps_pools_are_empty_p (void);
1388 : : extern void sched_free_deps (rtx_insn *, rtx_insn *, bool);
1389 : : extern void extend_dependency_caches (int, bool);
1390 : :
1391 : : extern void debug_ds (ds_t);
1392 : :
1393 : :
1394 : : /* Functions in haifa-sched.cc. */
1395 : : extern void initialize_live_range_shrinkage (void);
1396 : : extern void finish_live_range_shrinkage (void);
1397 : : extern void sched_init_region_reg_pressure_info (void);
1398 : : extern void free_global_sched_pressure_data (void);
1399 : : extern int haifa_classify_insn (const_rtx);
1400 : : extern void get_ebb_head_tail (basic_block, basic_block,
1401 : : rtx_insn **, rtx_insn **);
1402 : : extern bool no_real_insns_p (const rtx_insn *, const rtx_insn *);
1403 : :
1404 : : extern int insn_sched_cost (rtx_insn *);
1405 : : extern int dep_cost_1 (dep_t, dw_t);
1406 : : extern int dep_cost (dep_t);
1407 : : extern int set_priorities (rtx_insn *, rtx_insn *);
1408 : :
1409 : : extern void sched_setup_bb_reg_pressure_info (basic_block, rtx_insn *);
1410 : : extern bool schedule_block (basic_block *, state_t);
1411 : :
1412 : : extern int cycle_issued_insns;
1413 : : extern int issue_rate;
1414 : : extern int dfa_lookahead;
1415 : :
1416 : : extern int autopref_multipass_dfa_lookahead_guard (rtx_insn *, int);
1417 : :
1418 : : extern rtx_insn *ready_element (struct ready_list *, int);
1419 : : extern rtx_insn **ready_lastpos (struct ready_list *);
1420 : :
1421 : : extern int try_ready (rtx_insn *);
1422 : : extern void sched_extend_ready_list (int);
1423 : : extern void sched_finish_ready_list (void);
1424 : : extern void sched_change_pattern (rtx, rtx);
1425 : : extern int sched_speculate_insn (rtx_insn *, ds_t, rtx *);
1426 : : extern void unlink_bb_notes (basic_block, basic_block);
1427 : : extern void add_block (basic_block, basic_block);
1428 : : extern rtx_note *bb_note (basic_block);
1429 : : extern void concat_note_lists (rtx_insn *, rtx_insn **);
1430 : : extern rtx_insn *sched_emit_insn (rtx);
1431 : : extern rtx_insn *get_ready_element (int);
1432 : : extern int number_in_ready (void);
1433 : :
1434 : : /* Types and functions in sched-ebb.cc. */
1435 : :
1436 : : extern basic_block schedule_ebb (rtx_insn *, rtx_insn *, bool);
1437 : : extern void schedule_ebbs_init (void);
1438 : : extern void schedule_ebbs_finish (void);
1439 : :
1440 : : /* Types and functions in sched-rgn.cc. */
1441 : :
1442 : : /* A region is the main entity for interblock scheduling: insns
1443 : : are allowed to move between blocks in the same region, along
1444 : : control flow graph edges, in the 'up' direction. */
1445 : : struct region
1446 : : {
1447 : : /* Number of extended basic blocks in region. */
1448 : : int rgn_nr_blocks;
1449 : : /* cblocks in the region (actually index in rgn_bb_table). */
1450 : : int rgn_blocks;
1451 : : /* Dependencies for this region are already computed. Basically, indicates,
1452 : : that this is a recovery block. */
1453 : : unsigned int dont_calc_deps : 1;
1454 : : /* This region has at least one non-trivial ebb. */
1455 : : unsigned int has_real_ebb : 1;
1456 : : };
1457 : :
1458 : : extern int nr_regions;
1459 : : extern region *rgn_table;
1460 : : extern int *rgn_bb_table;
1461 : : extern int *block_to_bb;
1462 : : extern int *containing_rgn;
1463 : :
1464 : : /* Often used short-hand in the scheduler. The rest of the compiler uses
1465 : : BLOCK_FOR_INSN(INSN) and an indirect reference to get the basic block
1466 : : number ("index"). For historical reasons, the scheduler does not. */
1467 : : #define BLOCK_NUM(INSN) (BLOCK_FOR_INSN (INSN)->index + 0)
1468 : :
1469 : : #define RGN_NR_BLOCKS(rgn) (rgn_table[rgn].rgn_nr_blocks)
1470 : : #define RGN_BLOCKS(rgn) (rgn_table[rgn].rgn_blocks)
1471 : : #define RGN_DONT_CALC_DEPS(rgn) (rgn_table[rgn].dont_calc_deps)
1472 : : #define RGN_HAS_REAL_EBB(rgn) (rgn_table[rgn].has_real_ebb)
1473 : : #define BLOCK_TO_BB(block) (block_to_bb[block])
1474 : : #define CONTAINING_RGN(block) (containing_rgn[block])
1475 : :
1476 : : /* The mapping from ebb to block. */
1477 : : extern int *ebb_head;
1478 : : #define BB_TO_BLOCK(ebb) (rgn_bb_table[ebb_head[ebb]])
1479 : : #define EBB_FIRST_BB(ebb) BASIC_BLOCK_FOR_FN (cfun, BB_TO_BLOCK (ebb))
1480 : : #define EBB_LAST_BB(ebb) \
1481 : : BASIC_BLOCK_FOR_FN (cfun, rgn_bb_table[ebb_head[ebb + 1] - 1])
1482 : : #define INSN_BB(INSN) (BLOCK_TO_BB (BLOCK_NUM (INSN)))
1483 : :
1484 : : extern int current_nr_blocks;
1485 : : extern int current_blocks;
1486 : : extern int target_bb;
1487 : : extern bool sched_no_dce;
1488 : :
1489 : : extern void set_modulo_params (int, int, int, int);
1490 : : extern void record_delay_slot_pair (rtx_insn *, rtx_insn *, int, int);
1491 : : extern rtx_insn *real_insn_for_shadow (rtx_insn *);
1492 : : extern void discard_delay_pairs_above (int);
1493 : : extern void free_delay_pairs (void);
1494 : : extern void add_delay_dependencies (rtx_insn *);
1495 : : extern bool sched_is_disabled_for_current_region_p (void);
1496 : : extern void sched_rgn_init (bool);
1497 : : extern void sched_rgn_finish (void);
1498 : : extern void rgn_setup_region (int);
1499 : : extern void sched_rgn_compute_dependencies (int);
1500 : : extern void sched_rgn_local_init (int);
1501 : : extern void sched_rgn_local_finish (void);
1502 : : extern void sched_rgn_local_free (void);
1503 : : extern void extend_regions (void);
1504 : : extern void rgn_make_new_region_out_of_new_block (basic_block);
1505 : :
1506 : : extern void compute_priorities (void);
1507 : : extern void increase_insn_priority (rtx_insn *, int);
1508 : : extern void debug_rgn_dependencies (int);
1509 : : extern void debug_dependencies (rtx_insn *, rtx_insn *);
1510 : : extern void dump_rgn_dependencies_dot (FILE *);
1511 : : extern void dump_rgn_dependencies_dot (const char *);
1512 : :
1513 : : extern void free_rgn_deps (void);
1514 : : extern bool contributes_to_priority (rtx_insn *, rtx_insn *);
1515 : : extern void extend_rgns (int *, int *, sbitmap, int *);
1516 : : extern void deps_join (class deps_desc *, class deps_desc *);
1517 : :
1518 : : extern void rgn_setup_common_sched_info (void);
1519 : : extern void rgn_setup_sched_infos (void);
1520 : :
1521 : : extern void debug_regions (void);
1522 : : extern void debug_region (int);
1523 : : extern void dump_region_dot (FILE *, int);
1524 : : extern void dump_region_dot_file (const char *, int);
1525 : :
1526 : : extern void haifa_sched_init (void);
1527 : : extern void haifa_sched_finish (void);
1528 : :
1529 : : extern void find_modifiable_mems (rtx_insn *, rtx_insn *);
1530 : :
1531 : : /* sched-deps.cc interface to walk, add, search, update, resolve, delete
1532 : : and debug instruction dependencies. */
1533 : :
1534 : : /* Constants defining dependences lists. */
1535 : :
1536 : : /* No list. */
1537 : : #define SD_LIST_NONE (0)
1538 : :
1539 : : /* hard_back_deps. */
1540 : : #define SD_LIST_HARD_BACK (1)
1541 : :
1542 : : /* spec_back_deps. */
1543 : : #define SD_LIST_SPEC_BACK (2)
1544 : :
1545 : : /* forw_deps. */
1546 : : #define SD_LIST_FORW (4)
1547 : :
1548 : : /* resolved_back_deps. */
1549 : : #define SD_LIST_RES_BACK (8)
1550 : :
1551 : : /* resolved_forw_deps. */
1552 : : #define SD_LIST_RES_FORW (16)
1553 : :
1554 : : #define SD_LIST_BACK (SD_LIST_HARD_BACK | SD_LIST_SPEC_BACK)
1555 : :
1556 : : /* A type to hold above flags. */
1557 : : typedef int sd_list_types_def;
1558 : :
1559 : : extern void sd_next_list (const_rtx, sd_list_types_def *, deps_list_t *, bool *);
1560 : :
1561 : : /* Iterator to walk through, resolve and delete dependencies. */
1562 : : struct _sd_iterator
1563 : : {
1564 : : /* What lists to walk. Can be any combination of SD_LIST_* flags. */
1565 : : sd_list_types_def types;
1566 : :
1567 : : /* Instruction dependencies lists of which will be walked. */
1568 : : rtx insn;
1569 : :
1570 : : /* Pointer to the next field of the previous element. This is not
1571 : : simply a pointer to the next element to allow easy deletion from the
1572 : : list. When a dep is being removed from the list the iterator
1573 : : will automatically advance because the value in *linkp will start
1574 : : referring to the next element. */
1575 : : dep_link_t *linkp;
1576 : :
1577 : : /* True if the current list is a resolved one. */
1578 : : bool resolved_p;
1579 : : };
1580 : :
1581 : : typedef struct _sd_iterator sd_iterator_def;
1582 : :
1583 : : /* ??? We can move some definitions that are used in below inline functions
1584 : : out of sched-int.h to sched-deps.cc provided that the below functions will
1585 : : become global externals.
1586 : : These definitions include:
1587 : : * struct _deps_list: opaque pointer is needed at global scope.
1588 : : * struct _dep_link: opaque pointer is needed at scope of sd_iterator_def.
1589 : : * struct _dep_node: opaque pointer is needed at scope of
1590 : : struct _deps_link. */
1591 : :
1592 : : /* Return initialized iterator. */
1593 : : inline sd_iterator_def
1594 : 1687110405 : sd_iterator_start (rtx insn, sd_list_types_def types)
1595 : : {
1596 : : /* Some dep_link a pointer to which will return NULL. */
1597 : 1687110405 : static dep_link_t null_link = NULL;
1598 : :
1599 : 1687110405 : sd_iterator_def i;
1600 : :
1601 : 1687110405 : i.types = types;
1602 : 1687110405 : i.insn = insn;
1603 : 1687110405 : i.linkp = &null_link;
1604 : :
1605 : : /* Avoid 'uninitialized warning'. */
1606 : 1687110405 : i.resolved_p = false;
1607 : :
1608 : 1687110405 : return i;
1609 : : }
1610 : :
1611 : : /* Return the current element. */
1612 : : inline bool
1613 : 4242349627 : sd_iterator_cond (sd_iterator_def *it_ptr, dep_t *dep_ptr)
1614 : : {
1615 : 7832740749 : while (true)
1616 : : {
1617 : 6037545188 : dep_link_t link = *it_ptr->linkp;
1618 : :
1619 : 6037545188 : if (link != NULL)
1620 : : {
1621 : 2913228672 : *dep_ptr = DEP_LINK_DEP (link);
1622 : 2913228672 : return true;
1623 : : }
1624 : : else
1625 : : {
1626 : 3124316516 : sd_list_types_def types = it_ptr->types;
1627 : :
1628 : 3124316516 : if (types != SD_LIST_NONE)
1629 : : /* Switch to next list. */
1630 : : {
1631 : 1795195562 : deps_list_t list;
1632 : :
1633 : 1795195562 : sd_next_list (it_ptr->insn,
1634 : : &it_ptr->types, &list, &it_ptr->resolved_p);
1635 : :
1636 : 1795195562 : if (list)
1637 : : {
1638 : 1795195561 : it_ptr->linkp = &DEPS_LIST_FIRST (list);
1639 : 1795195561 : continue;
1640 : : }
1641 : : }
1642 : :
1643 : 1329120955 : *dep_ptr = NULL;
1644 : 1329120955 : return false;
1645 : : }
1646 : : }
1647 : : }
1648 : :
1649 : : /* Advance iterator. */
1650 : : inline void
1651 : 2162949379 : sd_iterator_next (sd_iterator_def *it_ptr)
1652 : : {
1653 : 996173727 : it_ptr->linkp = &DEP_LINK_NEXT (*it_ptr->linkp);
1654 : 2162581406 : }
1655 : :
1656 : : /* A cycle wrapper. */
1657 : : #define FOR_EACH_DEP(INSN, LIST_TYPES, ITER, DEP) \
1658 : : for ((ITER) = sd_iterator_start ((INSN), (LIST_TYPES)); \
1659 : : sd_iterator_cond (&(ITER), &(DEP)); \
1660 : : sd_iterator_next (&(ITER)))
1661 : :
1662 : : #define IS_DISPATCH_ON 1
1663 : : #define IS_CMP 2
1664 : : #define DISPATCH_VIOLATION 3
1665 : : #define FITS_DISPATCH_WINDOW 4
1666 : : #define DISPATCH_INIT 5
1667 : : #define ADD_TO_DISPATCH_WINDOW 6
1668 : :
1669 : : extern int sd_lists_size (const_rtx, sd_list_types_def);
1670 : : extern bool sd_lists_empty_p (const_rtx, sd_list_types_def);
1671 : : extern void sd_init_insn (rtx_insn *);
1672 : : extern void sd_finish_insn (rtx_insn *);
1673 : : extern dep_t sd_find_dep_between (rtx, rtx, bool);
1674 : : extern void sd_add_dep (dep_t, bool);
1675 : : extern enum DEPS_ADJUST_RESULT sd_add_or_update_dep (dep_t, bool);
1676 : : extern void sd_resolve_dep (sd_iterator_def);
1677 : : extern void sd_unresolve_dep (sd_iterator_def);
1678 : : extern void sd_copy_back_deps (rtx_insn *, rtx_insn *, bool);
1679 : : extern void sd_delete_dep (sd_iterator_def);
1680 : : extern void sd_debug_lists (rtx, sd_list_types_def);
1681 : :
1682 : : extern int dep_list_size (rtx_insn *, sd_list_types_def);
1683 : :
1684 : : /* Macros and declarations for scheduling fusion. */
1685 : : #define FUSION_MAX_PRIORITY (INT_MAX)
1686 : : extern bool sched_fusion;
1687 : :
1688 : : #endif /* INSN_SCHEDULING */
1689 : :
1690 : : #endif /* GCC_SCHED_INT_H */
1691 : :
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