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basic-block.h (110611) basic-block.h (117395)
1/* Define control and data flow tables, and regsets.
2 Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free

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21
22#ifndef GCC_BASIC_BLOCK_H
23#define GCC_BASIC_BLOCK_H
24
25#include "bitmap.h"
26#include "sbitmap.h"
27#include "varray.h"
28#include "partition.h"
1/* Define control and data flow tables, and regsets.
2 Copyright (C) 1987, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 Free Software Foundation, Inc.
4
5This file is part of GCC.
6
7GCC is free software; you can redistribute it and/or modify it under
8the terms of the GNU General Public License as published by the Free

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21
22#ifndef GCC_BASIC_BLOCK_H
23#define GCC_BASIC_BLOCK_H
24
25#include "bitmap.h"
26#include "sbitmap.h"
27#include "varray.h"
28#include "partition.h"
29#include "hard-reg-set.h"
29
30/* Head of register set linked list. */
31typedef bitmap_head regset_head;
32/* A pointer to a regset_head. */
33typedef bitmap regset;
34
35/* Initialize a new regset. */
30
31/* Head of register set linked list. */
32typedef bitmap_head regset_head;
33/* A pointer to a regset_head. */
34typedef bitmap regset;
35
36/* Initialize a new regset. */
36#define INIT_REG_SET(HEAD) bitmap_initialize (HEAD)
37#define INIT_REG_SET(HEAD) bitmap_initialize (HEAD, 1)
37
38/* Clear a register set by freeing up the linked list. */
39#define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD)
40
41/* Copy a register set to another register set. */
42#define COPY_REG_SET(TO, FROM) bitmap_copy (TO, FROM)
43
44/* Compare two register sets. */

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94 set in both regsets. */
95#define EXECUTE_IF_AND_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
96 EXECUTE_IF_AND_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
97
98/* Allocate a register set with oballoc. */
99#define OBSTACK_ALLOC_REG_SET(OBSTACK) BITMAP_OBSTACK_ALLOC (OBSTACK)
100
101/* Initialize a register set. Returns the new register set. */
38
39/* Clear a register set by freeing up the linked list. */
40#define CLEAR_REG_SET(HEAD) bitmap_clear (HEAD)
41
42/* Copy a register set to another register set. */
43#define COPY_REG_SET(TO, FROM) bitmap_copy (TO, FROM)
44
45/* Compare two register sets. */

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95 set in both regsets. */
96#define EXECUTE_IF_AND_IN_REG_SET(REGSET1, REGSET2, MIN, REGNUM, CODE) \
97 EXECUTE_IF_AND_IN_BITMAP (REGSET1, REGSET2, MIN, REGNUM, CODE)
98
99/* Allocate a register set with oballoc. */
100#define OBSTACK_ALLOC_REG_SET(OBSTACK) BITMAP_OBSTACK_ALLOC (OBSTACK)
101
102/* Initialize a register set. Returns the new register set. */
102#define INITIALIZE_REG_SET(HEAD) bitmap_initialize (&HEAD)
103#define INITIALIZE_REG_SET(HEAD) bitmap_initialize (&HEAD, 1)
103
104/* Do any cleanup needed on a regset when it is no longer used. */
105#define FREE_REG_SET(REGSET) BITMAP_FREE(REGSET)
106
107/* Do any one-time initializations needed for regsets. */
108#define INIT_ONCE_REG_SET() BITMAP_INIT_ONCE ()
109
110/* Grow any tables needed when the number of registers is calculated

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130 void *aux;
131
132 int flags; /* see EDGE_* below */
133 int probability; /* biased by REG_BR_PROB_BASE */
134 gcov_type count; /* Expected number of executions calculated
135 in profile.c */
136} *edge;
137
104
105/* Do any cleanup needed on a regset when it is no longer used. */
106#define FREE_REG_SET(REGSET) BITMAP_FREE(REGSET)
107
108/* Do any one-time initializations needed for regsets. */
109#define INIT_ONCE_REG_SET() BITMAP_INIT_ONCE ()
110
111/* Grow any tables needed when the number of registers is calculated

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131 void *aux;
132
133 int flags; /* see EDGE_* below */
134 int probability; /* biased by REG_BR_PROB_BASE */
135 gcov_type count; /* Expected number of executions calculated
136 in profile.c */
137} *edge;
138
138#define EDGE_FALLTHRU 1
139#define EDGE_ABNORMAL 2
140#define EDGE_ABNORMAL_CALL 4
141#define EDGE_EH 8
142#define EDGE_FAKE 16
143#define EDGE_DFS_BACK 32
139#define EDGE_FALLTHRU 1 /* 'Straight line' flow */
140#define EDGE_ABNORMAL 2 /* Strange flow, like computed
141 label, or eh */
142#define EDGE_ABNORMAL_CALL 4 /* Call with abnormal exit
143 like an exception, or sibcall */
144#define EDGE_EH 8 /* Exception throw */
145#define EDGE_FAKE 16 /* Not a real edge (profile.c) */
146#define EDGE_DFS_BACK 32 /* A backwards edge */
147#define EDGE_CAN_FALLTHRU 64 /* Candidate for straight line
148 flow. */
144
145#define EDGE_COMPLEX (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_EH)
146
147
148/* A basic block is a sequence of instructions with only entry and
149 only one exit. If any one of the instructions are executed, they
150 will all be executed, and in sequence from first to last.
151

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200 regset global_live_at_end;
201
202 /* Auxiliary info specific to a pass. */
203 void *aux;
204
205 /* The index of this block. */
206 int index;
207
149
150#define EDGE_COMPLEX (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_EH)
151
152
153/* A basic block is a sequence of instructions with only entry and
154 only one exit. If any one of the instructions are executed, they
155 will all be executed, and in sequence from first to last.
156

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205 regset global_live_at_end;
206
207 /* Auxiliary info specific to a pass. */
208 void *aux;
209
210 /* The index of this block. */
211 int index;
212
213 /* Previous and next blocks in the chain. */
214 struct basic_block_def *prev_bb, *next_bb;
215
208 /* The loop depth of this block. */
209 int loop_depth;
210
216 /* The loop depth of this block. */
217 int loop_depth;
218
219 /* Outermost loop containing the block. */
220 struct loop *loop_father;
221
211 /* Expected number of executions: calculated in profile.c. */
212 gcov_type count;
213
214 /* Expected frequency. Normalized to be in range 0 to BB_FREQ_MAX. */
215 int frequency;
216
217 /* Various flags. See BB_* below. */
218 int flags;
219} *basic_block;
220
221#define BB_FREQ_MAX 10000
222
223/* Masks for basic_block.flags. */
222 /* Expected number of executions: calculated in profile.c. */
223 gcov_type count;
224
225 /* Expected frequency. Normalized to be in range 0 to BB_FREQ_MAX. */
226 int frequency;
227
228 /* Various flags. See BB_* below. */
229 int flags;
230} *basic_block;
231
232#define BB_FREQ_MAX 10000
233
234/* Masks for basic_block.flags. */
224#define BB_REACHABLE 1
235#define BB_DIRTY 1
236#define BB_NEW 2
237#define BB_REACHABLE 4
238#define BB_VISITED 8
225
226/* Number of basic blocks in the current function. */
227
228extern int n_basic_blocks;
229
239
240/* Number of basic blocks in the current function. */
241
242extern int n_basic_blocks;
243
244/* First free basic block number. */
245
246extern int last_basic_block;
247
230/* Number of edges in the current function. */
231
232extern int n_edges;
233
234/* Index by basic block number, get basic block struct info. */
235
236extern varray_type basic_block_info;
237
238#define BASIC_BLOCK(N) (VARRAY_BB (basic_block_info, (N)))
239
248/* Number of edges in the current function. */
249
250extern int n_edges;
251
252/* Index by basic block number, get basic block struct info. */
253
254extern varray_type basic_block_info;
255
256#define BASIC_BLOCK(N) (VARRAY_BB (basic_block_info, (N)))
257
258/* For iterating over basic blocks. */
259#define FOR_BB_BETWEEN(BB, FROM, TO, DIR) \
260 for (BB = FROM; BB != TO; BB = BB->DIR)
261
262#define FOR_EACH_BB(BB) \
263 FOR_BB_BETWEEN (BB, ENTRY_BLOCK_PTR->next_bb, EXIT_BLOCK_PTR, next_bb)
264
265#define FOR_EACH_BB_REVERSE(BB) \
266 FOR_BB_BETWEEN (BB, EXIT_BLOCK_PTR->prev_bb, ENTRY_BLOCK_PTR, prev_bb)
267
268/* Cycles through _all_ basic blocks, even the fake ones (entry and
269 exit block). */
270
271#define FOR_ALL_BB(BB) \
272 for (BB = ENTRY_BLOCK_PTR; BB; BB = BB->next_bb)
273
240/* What registers are live at the setjmp call. */
241
242extern regset regs_live_at_setjmp;
243
244/* Special labels found during CFG build. */
245
274/* What registers are live at the setjmp call. */
275
276extern regset regs_live_at_setjmp;
277
278/* Special labels found during CFG build. */
279
246extern rtx label_value_list, tail_recursion_label_list;
280extern GTY(()) rtx label_value_list;
281extern GTY(()) rtx tail_recursion_label_list;
247
248extern struct obstack flow_obstack;
249
250/* Indexed by n, gives number of basic block that (REG n) is used in.
251 If the value is REG_BLOCK_GLOBAL (-2),
252 it means (REG n) is used in more than one basic block.
253 REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
254 This information remains valid for the rest of the compilation

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274/* Special block number not valid for any block. */
275#define INVALID_BLOCK (-3)
276
277/* Similarly, block pointers for the edge list. */
278extern struct basic_block_def entry_exit_blocks[2];
279#define ENTRY_BLOCK_PTR (&entry_exit_blocks[0])
280#define EXIT_BLOCK_PTR (&entry_exit_blocks[1])
281
282
283extern struct obstack flow_obstack;
284
285/* Indexed by n, gives number of basic block that (REG n) is used in.
286 If the value is REG_BLOCK_GLOBAL (-2),
287 it means (REG n) is used in more than one basic block.
288 REG_BLOCK_UNKNOWN (-1) means it hasn't been seen yet so we don't know.
289 This information remains valid for the rest of the compilation

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309/* Special block number not valid for any block. */
310#define INVALID_BLOCK (-3)
311
312/* Similarly, block pointers for the edge list. */
313extern struct basic_block_def entry_exit_blocks[2];
314#define ENTRY_BLOCK_PTR (&entry_exit_blocks[0])
315#define EXIT_BLOCK_PTR (&entry_exit_blocks[1])
316
282extern varray_type basic_block_for_insn;
283#define BLOCK_FOR_INSN(INSN) VARRAY_BB (basic_block_for_insn, INSN_UID (INSN))
284#define BLOCK_NUM(INSN) (BLOCK_FOR_INSN (INSN)->index + 0)
317#define BLOCK_NUM(INSN) (BLOCK_FOR_INSN (INSN)->index + 0)
318#define set_block_for_insn(INSN, BB) (BLOCK_FOR_INSN (INSN) = BB)
285
319
286extern void compute_bb_for_insn PARAMS ((int));
320extern void compute_bb_for_insn PARAMS ((void));
287extern void free_bb_for_insn PARAMS ((void));
288extern void update_bb_for_insn PARAMS ((basic_block));
321extern void free_bb_for_insn PARAMS ((void));
322extern void update_bb_for_insn PARAMS ((basic_block));
289extern void set_block_for_insn PARAMS ((rtx, basic_block));
290
291extern void free_basic_block_vars PARAMS ((int));
292
293extern edge split_block PARAMS ((basic_block, rtx));
294extern basic_block split_edge PARAMS ((edge));
295extern void insert_insn_on_edge PARAMS ((rtx, edge));
323
324extern void free_basic_block_vars PARAMS ((int));
325
326extern edge split_block PARAMS ((basic_block, rtx));
327extern basic_block split_edge PARAMS ((edge));
328extern void insert_insn_on_edge PARAMS ((rtx, edge));
329
296extern void commit_edge_insertions PARAMS ((void));
330extern void commit_edge_insertions PARAMS ((void));
331extern void commit_edge_insertions_watch_calls PARAMS ((void));
332
297extern void remove_fake_edges PARAMS ((void));
298extern void add_noreturn_fake_exit_edges PARAMS ((void));
299extern void connect_infinite_loops_to_exit PARAMS ((void));
300extern int flow_call_edges_add PARAMS ((sbitmap));
301extern edge cached_make_edge PARAMS ((sbitmap *, basic_block,
302 basic_block, int));
333extern void remove_fake_edges PARAMS ((void));
334extern void add_noreturn_fake_exit_edges PARAMS ((void));
335extern void connect_infinite_loops_to_exit PARAMS ((void));
336extern int flow_call_edges_add PARAMS ((sbitmap));
337extern edge cached_make_edge PARAMS ((sbitmap *, basic_block,
338 basic_block, int));
339extern edge unchecked_make_edge PARAMS ((basic_block,
340 basic_block, int));
303extern edge make_edge PARAMS ((basic_block,
304 basic_block, int));
305extern edge make_single_succ_edge PARAMS ((basic_block,
306 basic_block, int));
307extern void remove_edge PARAMS ((edge));
308extern void redirect_edge_succ PARAMS ((edge, basic_block));
309extern edge redirect_edge_succ_nodup PARAMS ((edge, basic_block));
310extern void redirect_edge_pred PARAMS ((edge, basic_block));
341extern edge make_edge PARAMS ((basic_block,
342 basic_block, int));
343extern edge make_single_succ_edge PARAMS ((basic_block,
344 basic_block, int));
345extern void remove_edge PARAMS ((edge));
346extern void redirect_edge_succ PARAMS ((edge, basic_block));
347extern edge redirect_edge_succ_nodup PARAMS ((edge, basic_block));
348extern void redirect_edge_pred PARAMS ((edge, basic_block));
311extern basic_block create_basic_block_structure PARAMS ((int, rtx, rtx, rtx));
312extern basic_block create_basic_block PARAMS ((int, rtx, rtx));
349extern basic_block create_basic_block_structure PARAMS ((rtx, rtx, rtx, basic_block));
350extern basic_block create_basic_block PARAMS ((rtx, rtx, basic_block));
313extern int flow_delete_block PARAMS ((basic_block));
314extern int flow_delete_block_noexpunge PARAMS ((basic_block));
351extern int flow_delete_block PARAMS ((basic_block));
352extern int flow_delete_block_noexpunge PARAMS ((basic_block));
353extern void clear_bb_flags PARAMS ((void));
315extern void merge_blocks_nomove PARAMS ((basic_block, basic_block));
316extern void tidy_fallthru_edge PARAMS ((edge, basic_block,
317 basic_block));
318extern void tidy_fallthru_edges PARAMS ((void));
319extern void flow_reverse_top_sort_order_compute PARAMS ((int *));
320extern int flow_depth_first_order_compute PARAMS ((int *, int *));
321extern void flow_preorder_transversal_compute PARAMS ((int *));
322extern void dump_edge_info PARAMS ((FILE *, edge, int));
323extern void clear_edges PARAMS ((void));
324extern void mark_critical_edges PARAMS ((void));
325extern rtx first_insn_after_basic_block_note PARAMS ((basic_block));
326
354extern void merge_blocks_nomove PARAMS ((basic_block, basic_block));
355extern void tidy_fallthru_edge PARAMS ((edge, basic_block,
356 basic_block));
357extern void tidy_fallthru_edges PARAMS ((void));
358extern void flow_reverse_top_sort_order_compute PARAMS ((int *));
359extern int flow_depth_first_order_compute PARAMS ((int *, int *));
360extern void flow_preorder_transversal_compute PARAMS ((int *));
361extern void dump_edge_info PARAMS ((FILE *, edge, int));
362extern void clear_edges PARAMS ((void));
363extern void mark_critical_edges PARAMS ((void));
364extern rtx first_insn_after_basic_block_note PARAMS ((basic_block));
365
366/* Dominator information for basic blocks. */
367
368typedef struct dominance_info *dominance_info;
369
327/* Structure to hold information for each natural loop. */
328struct loop
329{
330 /* Index into loops array. */
331 int num;
332
333 /* Basic block of loop header. */
334 basic_block header;

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374 int num_exits;
375
376 /* Bitmap of blocks that dominate all exits of the loop. */
377 sbitmap exits_doms;
378
379 /* The loop nesting depth. */
380 int depth;
381
370/* Structure to hold information for each natural loop. */
371struct loop
372{
373 /* Index into loops array. */
374 int num;
375
376 /* Basic block of loop header. */
377 basic_block header;

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417 int num_exits;
418
419 /* Bitmap of blocks that dominate all exits of the loop. */
420 sbitmap exits_doms;
421
422 /* The loop nesting depth. */
423 int depth;
424
425 /* Superloops of the loop. */
426 struct loop **pred;
427
382 /* The height of the loop (enclosed loop levels) within the loop
383 hierarchy tree. */
384 int level;
385
386 /* The outer (parent) loop or NULL if outermost loop. */
387 struct loop *outer;
388
389 /* The first inner (child) loop or NULL if innermost loop. */
390 struct loop *inner;
391
392 /* Link to the next (sibling) loop. */
393 struct loop *next;
394
428 /* The height of the loop (enclosed loop levels) within the loop
429 hierarchy tree. */
430 int level;
431
432 /* The outer (parent) loop or NULL if outermost loop. */
433 struct loop *outer;
434
435 /* The first inner (child) loop or NULL if innermost loop. */
436 struct loop *inner;
437
438 /* Link to the next (sibling) loop. */
439 struct loop *next;
440
395 /* Non-zero if the loop shares a header with another loop. */
396 int shared;
397
398 /* Non-zero if the loop is invalid (e.g., contains setjmp.). */
441 /* Nonzero if the loop is invalid (e.g., contains setjmp.). */
399 int invalid;
400
401 /* Auxiliary info specific to a pass. */
402 void *aux;
403
404 /* The following are currently used by loop.c but they are likely to
405 disappear as loop.c is converted to use the CFG. */
406
442 int invalid;
443
444 /* Auxiliary info specific to a pass. */
445 void *aux;
446
447 /* The following are currently used by loop.c but they are likely to
448 disappear as loop.c is converted to use the CFG. */
449
407 /* Non-zero if the loop has a NOTE_INSN_LOOP_VTOP. */
450 /* Nonzero if the loop has a NOTE_INSN_LOOP_VTOP. */
408 rtx vtop;
409
451 rtx vtop;
452
410 /* Non-zero if the loop has a NOTE_INSN_LOOP_CONT.
453 /* Nonzero if the loop has a NOTE_INSN_LOOP_CONT.
411 A continue statement will generate a branch to NEXT_INSN (cont). */
412 rtx cont;
413
454 A continue statement will generate a branch to NEXT_INSN (cont). */
455 rtx cont;
456
414 /* The dominator of cont. */
415 rtx cont_dominator;
416
417 /* The NOTE_INSN_LOOP_BEG. */
418 rtx start;
419
420 /* The NOTE_INSN_LOOP_END. */
421 rtx end;
422
423 /* For a rotated loop that is entered near the bottom,
424 this is the label at the top. Otherwise it is zero. */

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455
456 /* Maxium nested loop level in the function. */
457 int levels;
458
459 /* Array of natural loop descriptors (scanning this array in reverse order
460 will find the inner loops before their enclosing outer loops). */
461 struct loop *array;
462
457 /* The NOTE_INSN_LOOP_BEG. */
458 rtx start;
459
460 /* The NOTE_INSN_LOOP_END. */
461 rtx end;
462
463 /* For a rotated loop that is entered near the bottom,
464 this is the label at the top. Otherwise it is zero. */

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495
496 /* Maxium nested loop level in the function. */
497 int levels;
498
499 /* Array of natural loop descriptors (scanning this array in reverse order
500 will find the inner loops before their enclosing outer loops). */
501 struct loop *array;
502
503 /* The above array is unused in new loop infrastructure and is kept only for
504 purposes of the old loop optimizer. Instead we store just pointers to
505 loops here. */
506 struct loop **parray;
507
463 /* Pointer to root of loop heirachy tree. */
464 struct loop *tree_root;
465
466 /* Information derived from the CFG. */
467 struct cfg
468 {
469 /* The bitmap vector of dominators or NULL if not computed. */
508 /* Pointer to root of loop heirachy tree. */
509 struct loop *tree_root;
510
511 /* Information derived from the CFG. */
512 struct cfg
513 {
514 /* The bitmap vector of dominators or NULL if not computed. */
470 sbitmap *dom;
515 dominance_info dom;
471
472 /* The ordering of the basic blocks in a depth first search. */
473 int *dfs_order;
474
475 /* The reverse completion ordering of the basic blocks found in a
476 depth first search. */
477 int *rc_order;
478 } cfg;
479
480 /* Headers shared by multiple loops that should be merged. */
481 sbitmap shared_headers;
482};
483
516
517 /* The ordering of the basic blocks in a depth first search. */
518 int *dfs_order;
519
520 /* The reverse completion ordering of the basic blocks found in a
521 depth first search. */
522 int *rc_order;
523 } cfg;
524
525 /* Headers shared by multiple loops that should be merged. */
526 sbitmap shared_headers;
527};
528
529/* Structure to group all of the information to process IF-THEN and
530 IF-THEN-ELSE blocks for the conditional execution support. This
531 needs to be in a public file in case the IFCVT macros call
532 functions passing the ce_if_block data structure. */
533
534typedef struct ce_if_block
535{
536 basic_block test_bb; /* First test block. */
537 basic_block then_bb; /* THEN block. */
538 basic_block else_bb; /* ELSE block or NULL. */
539 basic_block join_bb; /* Join THEN/ELSE blocks. */
540 basic_block last_test_bb; /* Last bb to hold && or || tests. */
541 int num_multiple_test_blocks; /* # of && and || basic blocks. */
542 int num_and_and_blocks; /* # of && blocks. */
543 int num_or_or_blocks; /* # of || blocks. */
544 int num_multiple_test_insns; /* # of insns in && and || blocks. */
545 int and_and_p; /* Complex test is &&. */
546 int num_then_insns; /* # of insns in THEN block. */
547 int num_else_insns; /* # of insns in ELSE block. */
548 int pass; /* Pass number. */
549
550#ifdef IFCVT_EXTRA_FIELDS
551 IFCVT_EXTRA_FIELDS /* Any machine dependent fields. */
552#endif
553
554} ce_if_block_t;
555
484extern int flow_loops_find PARAMS ((struct loops *, int flags));
485extern int flow_loops_update PARAMS ((struct loops *, int flags));
486extern void flow_loops_free PARAMS ((struct loops *));
487extern void flow_loops_dump PARAMS ((const struct loops *, FILE *,
488 void (*)(const struct loop *,
489 FILE *, int), int));
490extern void flow_loop_dump PARAMS ((const struct loop *, FILE *,
491 void (*)(const struct loop *,
492 FILE *, int), int));
493extern int flow_loop_scan PARAMS ((struct loops *, struct loop *, int));
556extern int flow_loops_find PARAMS ((struct loops *, int flags));
557extern int flow_loops_update PARAMS ((struct loops *, int flags));
558extern void flow_loops_free PARAMS ((struct loops *));
559extern void flow_loops_dump PARAMS ((const struct loops *, FILE *,
560 void (*)(const struct loop *,
561 FILE *, int), int));
562extern void flow_loop_dump PARAMS ((const struct loop *, FILE *,
563 void (*)(const struct loop *,
564 FILE *, int), int));
565extern int flow_loop_scan PARAMS ((struct loops *, struct loop *, int));
566extern void flow_loop_tree_node_add PARAMS ((struct loop *, struct loop *));
567extern void flow_loop_tree_node_remove PARAMS ((struct loop *));
494
495/* This structure maintains an edge list vector. */
496struct edge_list
497{
498 int num_blocks;
499 int num_edges;
500 edge *index_to_edge;
501};

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557#define PROP_LOG_LINKS 2 /* Create LOG_LINKS. */
558#define PROP_REG_INFO 4 /* Update regs_ever_live et al. */
559#define PROP_KILL_DEAD_CODE 8 /* Remove dead code. */
560#define PROP_SCAN_DEAD_CODE 16 /* Scan for dead code. */
561#define PROP_ALLOW_CFG_CHANGES 32 /* Allow the CFG to be changed
562 by dead code removal. */
563#define PROP_AUTOINC 64 /* Create autoinc mem references. */
564#define PROP_EQUAL_NOTES 128 /* Take into account REG_EQUAL notes. */
568
569/* This structure maintains an edge list vector. */
570struct edge_list
571{
572 int num_blocks;
573 int num_edges;
574 edge *index_to_edge;
575};

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631#define PROP_LOG_LINKS 2 /* Create LOG_LINKS. */
632#define PROP_REG_INFO 4 /* Update regs_ever_live et al. */
633#define PROP_KILL_DEAD_CODE 8 /* Remove dead code. */
634#define PROP_SCAN_DEAD_CODE 16 /* Scan for dead code. */
635#define PROP_ALLOW_CFG_CHANGES 32 /* Allow the CFG to be changed
636 by dead code removal. */
637#define PROP_AUTOINC 64 /* Create autoinc mem references. */
638#define PROP_EQUAL_NOTES 128 /* Take into account REG_EQUAL notes. */
565#define PROP_FINAL 127 /* All of the above. */
639#define PROP_SCAN_DEAD_STORES 256 /* Scan for dead code. */
640#define PROP_FINAL (PROP_DEATH_NOTES | PROP_LOG_LINKS \
641 | PROP_REG_INFO | PROP_KILL_DEAD_CODE \
642 | PROP_SCAN_DEAD_CODE | PROP_AUTOINC \
643 | PROP_ALLOW_CFG_CHANGES \
644 | PROP_SCAN_DEAD_STORES)
566
567#define CLEANUP_EXPENSIVE 1 /* Do relativly expensive optimizations
568 except for edge forwarding */
569#define CLEANUP_CROSSJUMP 2 /* Do crossjumping. */
570#define CLEANUP_POST_REGSTACK 4 /* We run after reg-stack and need
571 to care REG_DEAD notes. */
572#define CLEANUP_PRE_SIBCALL 8 /* Do not get confused by code hidden
573 inside call_placeholders.. */
574#define CLEANUP_PRE_LOOP 16 /* Take care to preserve syntactic loop
575 notes. */
576#define CLEANUP_UPDATE_LIFE 32 /* Keep life information up to date. */
577#define CLEANUP_THREADING 64 /* Do jump threading. */
645
646#define CLEANUP_EXPENSIVE 1 /* Do relativly expensive optimizations
647 except for edge forwarding */
648#define CLEANUP_CROSSJUMP 2 /* Do crossjumping. */
649#define CLEANUP_POST_REGSTACK 4 /* We run after reg-stack and need
650 to care REG_DEAD notes. */
651#define CLEANUP_PRE_SIBCALL 8 /* Do not get confused by code hidden
652 inside call_placeholders.. */
653#define CLEANUP_PRE_LOOP 16 /* Take care to preserve syntactic loop
654 notes. */
655#define CLEANUP_UPDATE_LIFE 32 /* Keep life information up to date. */
656#define CLEANUP_THREADING 64 /* Do jump threading. */
657#define CLEANUP_NO_INSN_DEL 128 /* Do not try to delete trivially dead
658 insns. */
578/* Flags for loop discovery. */
579
580#define LOOP_TREE 1 /* Build loop hierarchy tree. */
581#define LOOP_PRE_HEADER 2 /* Analyse loop pre-header. */
582#define LOOP_ENTRY_EDGES 4 /* Find entry edges. */
583#define LOOP_EXIT_EDGES 8 /* Find exit edges. */
584#define LOOP_EDGES (LOOP_ENTRY_EDGES | LOOP_EXIT_EDGES)
659/* Flags for loop discovery. */
660
661#define LOOP_TREE 1 /* Build loop hierarchy tree. */
662#define LOOP_PRE_HEADER 2 /* Analyse loop pre-header. */
663#define LOOP_ENTRY_EDGES 4 /* Find entry edges. */
664#define LOOP_EXIT_EDGES 8 /* Find exit edges. */
665#define LOOP_EDGES (LOOP_ENTRY_EDGES | LOOP_EXIT_EDGES)
585#define LOOP_EXITS_DOMS 16 /* Find nodes that dom. all exits. */
586#define LOOP_ALL 31 /* All of the above */
666#define LOOP_ALL 15 /* All of the above */
587
588extern void life_analysis PARAMS ((rtx, FILE *, int));
667
668extern void life_analysis PARAMS ((rtx, FILE *, int));
589extern void update_life_info PARAMS ((sbitmap, enum update_life_extent,
669extern int update_life_info PARAMS ((sbitmap, enum update_life_extent,
590 int));
670 int));
671extern int update_life_info_in_dirty_blocks PARAMS ((enum update_life_extent,
672 int));
591extern int count_or_remove_death_notes PARAMS ((sbitmap, int));
592extern int propagate_block PARAMS ((basic_block, regset, regset, regset,
593 int));
594
595struct propagate_block_info;
596extern rtx propagate_one_insn PARAMS ((struct propagate_block_info *, rtx));
597extern struct propagate_block_info *init_propagate_block_info
598 PARAMS ((basic_block, regset, regset, regset, int));

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612extern int optimize_mode_switching PARAMS ((FILE *));
613
614/* In emit-rtl.c. */
615extern rtx emit_block_insn_after PARAMS ((rtx, rtx, basic_block));
616extern rtx emit_block_insn_before PARAMS ((rtx, rtx, basic_block));
617
618/* In predict.c */
619extern void estimate_probability PARAMS ((struct loops *));
673extern int count_or_remove_death_notes PARAMS ((sbitmap, int));
674extern int propagate_block PARAMS ((basic_block, regset, regset, regset,
675 int));
676
677struct propagate_block_info;
678extern rtx propagate_one_insn PARAMS ((struct propagate_block_info *, rtx));
679extern struct propagate_block_info *init_propagate_block_info
680 PARAMS ((basic_block, regset, regset, regset, int));

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694extern int optimize_mode_switching PARAMS ((FILE *));
695
696/* In emit-rtl.c. */
697extern rtx emit_block_insn_after PARAMS ((rtx, rtx, basic_block));
698extern rtx emit_block_insn_before PARAMS ((rtx, rtx, basic_block));
699
700/* In predict.c */
701extern void estimate_probability PARAMS ((struct loops *));
702extern void note_prediction_to_br_prob PARAMS ((void));
620extern void expected_value_to_br_prob PARAMS ((void));
703extern void expected_value_to_br_prob PARAMS ((void));
704extern void note_prediction_to_br_prob PARAMS ((void));
705extern bool maybe_hot_bb_p PARAMS ((basic_block));
706extern bool probably_cold_bb_p PARAMS ((basic_block));
707extern bool probably_never_executed_bb_p PARAMS ((basic_block));
621
622/* In flow.c */
623extern void init_flow PARAMS ((void));
624extern void reorder_basic_blocks PARAMS ((void));
625extern void dump_bb PARAMS ((basic_block, FILE *));
626extern void debug_bb PARAMS ((basic_block));
627extern void debug_bb_n PARAMS ((int));
628extern void dump_regset PARAMS ((regset, FILE *));
629extern void debug_regset PARAMS ((regset));
630extern void allocate_reg_life_data PARAMS ((void));
631extern void allocate_bb_life_data PARAMS ((void));
632extern void expunge_block PARAMS ((basic_block));
708
709/* In flow.c */
710extern void init_flow PARAMS ((void));
711extern void reorder_basic_blocks PARAMS ((void));
712extern void dump_bb PARAMS ((basic_block, FILE *));
713extern void debug_bb PARAMS ((basic_block));
714extern void debug_bb_n PARAMS ((int));
715extern void dump_regset PARAMS ((regset, FILE *));
716extern void debug_regset PARAMS ((regset));
717extern void allocate_reg_life_data PARAMS ((void));
718extern void allocate_bb_life_data PARAMS ((void));
719extern void expunge_block PARAMS ((basic_block));
633extern void expunge_block_nocompact PARAMS ((basic_block));
720extern void link_block PARAMS ((basic_block, basic_block));
721extern void unlink_block PARAMS ((basic_block));
722extern void compact_blocks PARAMS ((void));
634extern basic_block alloc_block PARAMS ((void));
635extern void find_unreachable_blocks PARAMS ((void));
723extern basic_block alloc_block PARAMS ((void));
724extern void find_unreachable_blocks PARAMS ((void));
636extern void delete_noop_moves PARAMS ((rtx));
725extern int delete_noop_moves PARAMS ((rtx));
637extern basic_block redirect_edge_and_branch_force PARAMS ((edge, basic_block));
638extern basic_block force_nonfallthru PARAMS ((edge));
639extern bool redirect_edge_and_branch PARAMS ((edge, basic_block));
640extern rtx block_label PARAMS ((basic_block));
641extern bool forwarder_block_p PARAMS ((basic_block));
642extern bool purge_all_dead_edges PARAMS ((int));
643extern bool purge_dead_edges PARAMS ((basic_block));
644extern void find_sub_basic_blocks PARAMS ((basic_block));

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656extern void alloc_aux_for_edges PARAMS ((int));
657extern void clear_aux_for_edges PARAMS ((void));
658extern void free_aux_for_edges PARAMS ((void));
659
660/* This function is always defined so it can be called from the
661 debugger, and it is declared extern so we don't get warnings about
662 it being unused. */
663extern void verify_flow_info PARAMS ((void));
726extern basic_block redirect_edge_and_branch_force PARAMS ((edge, basic_block));
727extern basic_block force_nonfallthru PARAMS ((edge));
728extern bool redirect_edge_and_branch PARAMS ((edge, basic_block));
729extern rtx block_label PARAMS ((basic_block));
730extern bool forwarder_block_p PARAMS ((basic_block));
731extern bool purge_all_dead_edges PARAMS ((int));
732extern bool purge_dead_edges PARAMS ((basic_block));
733extern void find_sub_basic_blocks PARAMS ((basic_block));

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745extern void alloc_aux_for_edges PARAMS ((int));
746extern void clear_aux_for_edges PARAMS ((void));
747extern void free_aux_for_edges PARAMS ((void));
748
749/* This function is always defined so it can be called from the
750 debugger, and it is declared extern so we don't get warnings about
751 it being unused. */
752extern void verify_flow_info PARAMS ((void));
664extern int flow_loop_outside_edge_p PARAMS ((const struct loop *, edge));
753extern bool flow_loop_outside_edge_p PARAMS ((const struct loop *, edge));
754extern bool flow_loop_nested_p PARAMS ((const struct loop *,
755 const struct loop *));
756extern bool flow_bb_inside_loop_p PARAMS ((const struct loop *,
757 const basic_block));
758extern basic_block *get_loop_body PARAMS ((const struct loop *));
759extern int dfs_enumerate_from PARAMS ((basic_block, int,
760 bool (*)(basic_block, void *),
761 basic_block *, int, void *));
665
762
763extern edge loop_preheader_edge PARAMS ((struct loop *));
764extern edge loop_latch_edge PARAMS ((struct loop *));
765
766extern void add_bb_to_loop PARAMS ((basic_block, struct loop *));
767extern void remove_bb_from_loops PARAMS ((basic_block));
768extern struct loop * find_common_loop PARAMS ((struct loop *, struct loop *));
769
770extern void verify_loop_structure PARAMS ((struct loops *, int));
771#define VLS_EXPECT_PREHEADERS 1
772#define VLS_EXPECT_SIMPLE_LATCHES 2
773
666typedef struct conflict_graph_def *conflict_graph;
667
668/* Callback function when enumerating conflicts. The arguments are
669 the smaller and larger regno in the conflict. Returns zero if
774typedef struct conflict_graph_def *conflict_graph;
775
776/* Callback function when enumerating conflicts. The arguments are
777 the smaller and larger regno in the conflict. Returns zero if
670 enumeration is to continue, non-zero to halt enumeration. */
778 enumeration is to continue, nonzero to halt enumeration. */
671typedef int (*conflict_graph_enum_fn) PARAMS ((int, int, void *));
672
673
674/* Prototypes of operations on conflict graphs. */
675
676extern conflict_graph conflict_graph_new
677 PARAMS ((int));
678extern void conflict_graph_delete PARAMS ((conflict_graph));

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685 void *));
686extern void conflict_graph_merge_regs PARAMS ((conflict_graph, int,
687 int));
688extern void conflict_graph_print PARAMS ((conflict_graph, FILE*));
689extern conflict_graph conflict_graph_compute
690 PARAMS ((regset,
691 partition));
692extern bool mark_dfs_back_edges PARAMS ((void));
779typedef int (*conflict_graph_enum_fn) PARAMS ((int, int, void *));
780
781
782/* Prototypes of operations on conflict graphs. */
783
784extern conflict_graph conflict_graph_new
785 PARAMS ((int));
786extern void conflict_graph_delete PARAMS ((conflict_graph));

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793 void *));
794extern void conflict_graph_merge_regs PARAMS ((conflict_graph, int,
795 int));
796extern void conflict_graph_print PARAMS ((conflict_graph, FILE*));
797extern conflict_graph conflict_graph_compute
798 PARAMS ((regset,
799 partition));
800extern bool mark_dfs_back_edges PARAMS ((void));
801extern void set_edge_can_fallthru_flag PARAMS ((void));
693extern void update_br_prob_note PARAMS ((basic_block));
694extern void fixup_abnormal_edges PARAMS ((void));
802extern void update_br_prob_note PARAMS ((basic_block));
803extern void fixup_abnormal_edges PARAMS ((void));
804extern bool can_hoist_insn_p PARAMS ((rtx, rtx, regset));
805extern rtx hoist_insn_after PARAMS ((rtx, rtx, rtx, rtx));
806extern rtx hoist_insn_to_edge PARAMS ((rtx, edge, rtx, rtx));
695extern bool control_flow_insn_p PARAMS ((rtx));
696
697/* In dominance.c */
698
699enum cdi_direction
700{
701 CDI_DOMINATORS,
702 CDI_POST_DOMINATORS
703};
704
807extern bool control_flow_insn_p PARAMS ((rtx));
808
809/* In dominance.c */
810
811enum cdi_direction
812{
813 CDI_DOMINATORS,
814 CDI_POST_DOMINATORS
815};
816
705extern void calculate_dominance_info PARAMS ((int *, sbitmap *,
706 enum cdi_direction));
707
817extern dominance_info calculate_dominance_info PARAMS ((enum cdi_direction));
818extern void free_dominance_info PARAMS ((dominance_info));
819extern basic_block nearest_common_dominator PARAMS ((dominance_info,
820 basic_block, basic_block));
821extern void set_immediate_dominator PARAMS ((dominance_info,
822 basic_block, basic_block));
823extern basic_block get_immediate_dominator PARAMS ((dominance_info,
824 basic_block));
825extern bool dominated_by_p PARAMS ((dominance_info, basic_block, basic_block));
826extern int get_dominated_by PARAMS ((dominance_info, basic_block, basic_block **));
827extern void add_to_dominance_info PARAMS ((dominance_info, basic_block));
828extern void delete_from_dominance_info PARAMS ((dominance_info, basic_block));
829basic_block recount_dominator PARAMS ((dominance_info, basic_block));
830extern void redirect_immediate_dominators PARAMS ((dominance_info, basic_block,
831 basic_block));
832void iterate_fix_dominators PARAMS ((dominance_info, basic_block *, int));
833extern void verify_dominators PARAMS ((dominance_info));
708#endif /* GCC_BASIC_BLOCK_H */
834#endif /* GCC_BASIC_BLOCK_H */