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096ab9ea | 1 | /* Functions to support general ended bitmaps. |
a945c346 | 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
096ab9ea | 3 | |
1322177d | 4 | This file is part of GCC. |
096ab9ea | 5 | |
1322177d LB |
6 | GCC is free software; you can redistribute it and/or modify it under |
7 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 8 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 9 | version. |
096ab9ea | 10 | |
1322177d LB |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
096ab9ea RK |
15 | |
16 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
096ab9ea | 19 | |
096ab9ea | 20 | #include "config.h" |
670ee920 | 21 | #include "system.h" |
4977bab6 | 22 | #include "coretypes.h" |
efc9bd41 | 23 | #include "bitmap.h" |
d9b950dd | 24 | #include "selftest.h" |
f75709c6 | 25 | |
2d44c7de ML |
26 | /* Memory allocation statistics purpose instance. */ |
27 | mem_alloc_description<bitmap_usage> bitmap_mem_desc; | |
f75709c6 | 28 | |
1c252ef3 RB |
29 | /* Static zero-initialized bitmap obstack used for default initialization |
30 | of bitmap_head. */ | |
31 | bitmap_obstack bitmap_head::crashme; | |
32 | ||
d1e14d97 SB |
33 | static bitmap_element *bitmap_tree_listify_from (bitmap, bitmap_element *); |
34 | ||
f75709c6 JH |
35 | /* Register new bitmap. */ |
36 | void | |
37 | bitmap_register (bitmap b MEM_STAT_DECL) | |
38 | { | |
7664eeb7 ML |
39 | static unsigned alloc_descriptor_max_uid = 1; |
40 | gcc_assert (b->alloc_descriptor == 0); | |
41 | b->alloc_descriptor = alloc_descriptor_max_uid++; | |
42 | ||
43 | bitmap_mem_desc.register_descriptor (b->get_descriptor (), BITMAP_ORIGIN, | |
44 | false FINAL_PASS_MEM_STAT); | |
f75709c6 JH |
45 | } |
46 | ||
47 | /* Account the overhead. */ | |
48 | static void | |
43331dfb | 49 | register_overhead (bitmap b, size_t amount) |
f75709c6 | 50 | { |
7664eeb7 ML |
51 | unsigned *d = b->get_descriptor (); |
52 | if (bitmap_mem_desc.contains_descriptor_for_instance (d)) | |
53 | bitmap_mem_desc.register_instance_overhead (amount, d); | |
54 | } | |
55 | ||
56 | /* Release the overhead. */ | |
57 | static void | |
58 | release_overhead (bitmap b, size_t amount, bool remove_from_map) | |
59 | { | |
60 | unsigned *d = b->get_descriptor (); | |
61 | if (bitmap_mem_desc.contains_descriptor_for_instance (d)) | |
62 | bitmap_mem_desc.release_instance_overhead (d, amount, remove_from_map); | |
f75709c6 | 63 | } |
096ab9ea | 64 | |
7664eeb7 | 65 | |
096ab9ea | 66 | /* Global data */ |
7932a3db NS |
67 | bitmap_element bitmap_zero_bits; /* An element of all zero bits. */ |
68 | bitmap_obstack bitmap_default_obstack; /* The default bitmap obstack. */ | |
a68ab351 | 69 | static int bitmap_default_obstack_depth; |
7932a3db NS |
70 | static GTY((deletable)) bitmap_element *bitmap_ggc_free; /* Freelist of |
71 | GC'd elements. */ | |
096ab9ea | 72 | |
096ab9ea | 73 | \f |
d1e14d97 | 74 | /* Bitmap memory management. */ |
88c4f655 | 75 | |
d1e14d97 | 76 | /* Add ELT to the appropriate freelist. */ |
47c321d4 | 77 | static inline void |
4682ae04 | 78 | bitmap_elem_to_freelist (bitmap head, bitmap_element *elt) |
e2500fed | 79 | { |
7932a3db | 80 | bitmap_obstack *bit_obstack = head->obstack; |
c22cacf3 | 81 | |
d1e14d97 | 82 | if (GATHER_STATISTICS) |
7664eeb7 | 83 | release_overhead (head, sizeof (bitmap_element), false); |
d1e14d97 | 84 | |
5765e552 | 85 | elt->next = NULL; |
a30fe4b6 | 86 | elt->indx = -1; |
7932a3db | 87 | if (bit_obstack) |
e2500fed | 88 | { |
5765e552 | 89 | elt->prev = bit_obstack->elements; |
7932a3db | 90 | bit_obstack->elements = elt; |
e2500fed GK |
91 | } |
92 | else | |
93 | { | |
5765e552 | 94 | elt->prev = bitmap_ggc_free; |
e2500fed GK |
95 | bitmap_ggc_free = elt; |
96 | } | |
97 | } | |
98 | ||
096ab9ea RK |
99 | /* Allocate a bitmap element. The bits are cleared, but nothing else is. */ |
100 | ||
47c321d4 | 101 | static inline bitmap_element * |
4682ae04 | 102 | bitmap_element_allocate (bitmap head) |
096ab9ea RK |
103 | { |
104 | bitmap_element *element; | |
7932a3db | 105 | bitmap_obstack *bit_obstack = head->obstack; |
c22cacf3 | 106 | |
7932a3db | 107 | if (bit_obstack) |
22fa5b8a | 108 | { |
7932a3db | 109 | element = bit_obstack->elements; |
c22cacf3 | 110 | |
7932a3db | 111 | if (element) |
5765e552 KZ |
112 | /* Use up the inner list first before looking at the next |
113 | element of the outer list. */ | |
114 | if (element->next) | |
115 | { | |
116 | bit_obstack->elements = element->next; | |
117 | bit_obstack->elements->prev = element->prev; | |
118 | } | |
119 | else | |
120 | /* Inner list was just a singleton. */ | |
121 | bit_obstack->elements = element->prev; | |
e2500fed | 122 | else |
7932a3db | 123 | element = XOBNEW (&bit_obstack->obstack, bitmap_element); |
e2500fed GK |
124 | } |
125 | else | |
126 | { | |
7932a3db NS |
127 | element = bitmap_ggc_free; |
128 | if (element) | |
5765e552 KZ |
129 | /* Use up the inner list first before looking at the next |
130 | element of the outer list. */ | |
131 | if (element->next) | |
132 | { | |
133 | bitmap_ggc_free = element->next; | |
134 | bitmap_ggc_free->prev = element->prev; | |
135 | } | |
136 | else | |
137 | /* Inner list was just a singleton. */ | |
138 | bitmap_ggc_free = element->prev; | |
e2500fed | 139 | else |
766090c2 | 140 | element = ggc_alloc<bitmap_element> (); |
22fa5b8a | 141 | } |
096ab9ea | 142 | |
7aa6d18a SB |
143 | if (GATHER_STATISTICS) |
144 | register_overhead (head, sizeof (bitmap_element)); | |
145 | ||
a615c28a | 146 | memset (element->bits, 0, sizeof (element->bits)); |
096ab9ea RK |
147 | |
148 | return element; | |
149 | } | |
150 | ||
d1e14d97 SB |
151 | /* Remove ELT and all following elements from bitmap HEAD. |
152 | Put the released elements in the freelist for HEAD. */ | |
87e08c69 RH |
153 | |
154 | void | |
7932a3db NS |
155 | bitmap_elt_clear_from (bitmap head, bitmap_element *elt) |
156 | { | |
5765e552 KZ |
157 | bitmap_element *prev; |
158 | bitmap_obstack *bit_obstack = head->obstack; | |
159 | ||
d1e14d97 SB |
160 | if (!elt) |
161 | return; | |
162 | ||
163 | if (head->tree_form) | |
164 | elt = bitmap_tree_listify_from (head, elt); | |
7aa6d18a SB |
165 | |
166 | if (GATHER_STATISTICS) | |
167 | { | |
168 | int n = 0; | |
169 | for (prev = elt; prev; prev = prev->next) | |
170 | n++; | |
7664eeb7 | 171 | release_overhead (head, sizeof (bitmap_element) * n, false); |
7aa6d18a | 172 | } |
7932a3db | 173 | |
5765e552 KZ |
174 | prev = elt->prev; |
175 | if (prev) | |
176 | { | |
177 | prev->next = NULL; | |
178 | if (head->current->indx > prev->indx) | |
179 | { | |
180 | head->current = prev; | |
181 | head->indx = prev->indx; | |
182 | } | |
c22cacf3 | 183 | } |
5765e552 KZ |
184 | else |
185 | { | |
186 | head->first = NULL; | |
187 | head->current = NULL; | |
188 | head->indx = 0; | |
189 | } | |
190 | ||
d1e14d97 | 191 | /* Put the entire list onto the freelist in one operation. */ |
5765e552 | 192 | if (bit_obstack) |
7932a3db | 193 | { |
c22cacf3 | 194 | elt->prev = bit_obstack->elements; |
5765e552 KZ |
195 | bit_obstack->elements = elt; |
196 | } | |
197 | else | |
198 | { | |
d1e14d97 SB |
199 | elt->prev = bitmap_ggc_free; |
200 | bitmap_ggc_free = elt; | |
201 | } | |
202 | } | |
203 | \f | |
204 | /* Linked-list view of bitmaps. | |
205 | ||
206 | In this representation, the bitmap elements form a double-linked list | |
207 | with elements sorted by increasing index. */ | |
208 | ||
209 | /* Link the bitmap element into the current bitmap linked list. */ | |
210 | ||
211 | static inline void | |
212 | bitmap_list_link_element (bitmap head, bitmap_element *element) | |
213 | { | |
214 | unsigned int indx = element->indx; | |
215 | bitmap_element *ptr; | |
216 | ||
217 | gcc_checking_assert (!head->tree_form); | |
218 | ||
219 | /* If this is the first and only element, set it in. */ | |
220 | if (head->first == 0) | |
221 | { | |
222 | element->next = element->prev = 0; | |
223 | head->first = element; | |
224 | } | |
225 | ||
226 | /* If this index is less than that of the current element, it goes someplace | |
227 | before the current element. */ | |
228 | else if (indx < head->indx) | |
229 | { | |
230 | for (ptr = head->current; | |
231 | ptr->prev != 0 && ptr->prev->indx > indx; | |
232 | ptr = ptr->prev) | |
233 | ; | |
234 | ||
235 | if (ptr->prev) | |
236 | ptr->prev->next = element; | |
237 | else | |
238 | head->first = element; | |
239 | ||
240 | element->prev = ptr->prev; | |
241 | element->next = ptr; | |
242 | ptr->prev = element; | |
243 | } | |
244 | ||
245 | /* Otherwise, it must go someplace after the current element. */ | |
246 | else | |
247 | { | |
248 | for (ptr = head->current; | |
249 | ptr->next != 0 && ptr->next->indx < indx; | |
250 | ptr = ptr->next) | |
251 | ; | |
252 | ||
253 | if (ptr->next) | |
254 | ptr->next->prev = element; | |
255 | ||
256 | element->next = ptr->next; | |
257 | element->prev = ptr; | |
258 | ptr->next = element; | |
259 | } | |
260 | ||
261 | /* Set up so this is the first element searched. */ | |
262 | head->current = element; | |
263 | head->indx = indx; | |
264 | } | |
265 | ||
266 | /* Unlink the bitmap element from the current bitmap linked list, | |
267 | and return it to the freelist. */ | |
268 | ||
269 | static inline void | |
029ca388 RB |
270 | bitmap_list_unlink_element (bitmap head, bitmap_element *element, |
271 | bool to_freelist = true) | |
d1e14d97 SB |
272 | { |
273 | bitmap_element *next = element->next; | |
274 | bitmap_element *prev = element->prev; | |
275 | ||
276 | gcc_checking_assert (!head->tree_form); | |
277 | ||
278 | if (prev) | |
279 | prev->next = next; | |
280 | ||
281 | if (next) | |
282 | next->prev = prev; | |
283 | ||
284 | if (head->first == element) | |
285 | head->first = next; | |
286 | ||
287 | /* Since the first thing we try is to insert before current, | |
288 | make current the next entry in preference to the previous. */ | |
289 | if (head->current == element) | |
290 | { | |
291 | head->current = next != 0 ? next : prev; | |
292 | if (head->current) | |
293 | head->indx = head->current->indx; | |
294 | else | |
295 | head->indx = 0; | |
296 | } | |
297 | ||
029ca388 RB |
298 | if (to_freelist) |
299 | bitmap_elem_to_freelist (head, element); | |
d1e14d97 SB |
300 | } |
301 | ||
029ca388 RB |
302 | /* Insert a new uninitialized element (or NODE if not NULL) into bitmap |
303 | HEAD after element ELT. If ELT is NULL, insert the element at the start. | |
304 | Return the new element. */ | |
d1e14d97 SB |
305 | |
306 | static bitmap_element * | |
307 | bitmap_list_insert_element_after (bitmap head, | |
029ca388 RB |
308 | bitmap_element *elt, unsigned int indx, |
309 | bitmap_element *node = NULL) | |
d1e14d97 | 310 | { |
029ca388 RB |
311 | if (!node) |
312 | node = bitmap_element_allocate (head); | |
d1e14d97 SB |
313 | node->indx = indx; |
314 | ||
315 | gcc_checking_assert (!head->tree_form); | |
316 | ||
317 | if (!elt) | |
318 | { | |
319 | if (!head->current) | |
320 | { | |
321 | head->current = node; | |
322 | head->indx = indx; | |
323 | } | |
324 | node->next = head->first; | |
325 | if (node->next) | |
326 | node->next->prev = node; | |
327 | head->first = node; | |
328 | node->prev = NULL; | |
329 | } | |
330 | else | |
331 | { | |
332 | gcc_checking_assert (head->current); | |
333 | node->next = elt->next; | |
334 | if (node->next) | |
335 | node->next->prev = node; | |
336 | elt->next = node; | |
337 | node->prev = elt; | |
338 | } | |
339 | return node; | |
340 | } | |
341 | ||
342 | /* Return the element for INDX, or NULL if the element doesn't exist. | |
343 | Update the `current' field even if we can't find an element that | |
344 | would hold the bitmap's bit to make eventual allocation | |
345 | faster. */ | |
346 | ||
347 | static inline bitmap_element * | |
348 | bitmap_list_find_element (bitmap head, unsigned int indx) | |
349 | { | |
350 | bitmap_element *element; | |
351 | ||
352 | if (head->current == NULL | |
353 | || head->indx == indx) | |
354 | return head->current; | |
355 | ||
356 | if (head->current == head->first | |
357 | && head->first->next == NULL) | |
358 | return NULL; | |
359 | ||
360 | /* Usage can be NULL due to allocated bitmaps for which we do not | |
361 | call initialize function. */ | |
362 | bitmap_usage *usage = NULL; | |
363 | if (GATHER_STATISTICS) | |
364 | usage = bitmap_mem_desc.get_descriptor_for_instance (head); | |
365 | ||
366 | /* This bitmap has more than one element, and we're going to look | |
367 | through the elements list. Count that as a search. */ | |
368 | if (GATHER_STATISTICS && usage) | |
369 | usage->m_nsearches++; | |
370 | ||
371 | if (head->indx < indx) | |
372 | /* INDX is beyond head->indx. Search from head->current | |
373 | forward. */ | |
374 | for (element = head->current; | |
375 | element->next != 0 && element->indx < indx; | |
376 | element = element->next) | |
377 | { | |
378 | if (GATHER_STATISTICS && usage) | |
379 | usage->m_search_iter++; | |
380 | } | |
381 | ||
382 | else if (head->indx / 2 < indx) | |
383 | /* INDX is less than head->indx and closer to head->indx than to | |
384 | 0. Search from head->current backward. */ | |
385 | for (element = head->current; | |
386 | element->prev != 0 && element->indx > indx; | |
387 | element = element->prev) | |
388 | { | |
389 | if (GATHER_STATISTICS && usage) | |
390 | usage->m_search_iter++; | |
391 | } | |
392 | ||
393 | else | |
394 | /* INDX is less than head->indx and closer to 0 than to | |
395 | head->indx. Search from head->first forward. */ | |
396 | for (element = head->first; | |
397 | element->next != 0 && element->indx < indx; | |
398 | element = element->next) | |
399 | { | |
400 | if (GATHER_STATISTICS && usage) | |
401 | usage->m_search_iter++; | |
402 | } | |
403 | ||
404 | /* `element' is the nearest to the one we want. If it's not the one we | |
405 | want, the one we want doesn't exist. */ | |
406 | gcc_checking_assert (element != NULL); | |
407 | head->current = element; | |
408 | head->indx = element->indx; | |
409 | if (element->indx != indx) | |
410 | element = 0; | |
411 | return element; | |
412 | } | |
413 | ||
414 | \f | |
415 | /* Splay-tree view of bitmaps. | |
416 | ||
417 | This is an almost one-to-one the implementatin of the simple top-down | |
418 | splay tree in Sleator and Tarjan's "Self-adjusting Binary Search Trees". | |
419 | It is probably not the most efficient form of splay trees, but it should | |
420 | be good enough to experiment with this idea of bitmaps-as-trees. | |
421 | ||
422 | For all functions below, the variable or function argument "t" is a node | |
423 | in the tree, and "e" is a temporary or new node in the tree. The rest | |
424 | is sufficiently straigh-forward (and very well explained in the paper) | |
425 | that comment would only clutter things. */ | |
426 | ||
427 | static inline void | |
428 | bitmap_tree_link_left (bitmap_element * &t, bitmap_element * &l) | |
429 | { | |
430 | l->next = t; | |
431 | l = t; | |
432 | t = t->next; | |
433 | } | |
434 | ||
435 | static inline void | |
436 | bitmap_tree_link_right (bitmap_element * &t, bitmap_element * &r) | |
437 | { | |
438 | r->prev = t; | |
439 | r = t; | |
440 | t = t->prev; | |
441 | } | |
442 | ||
443 | static inline void | |
444 | bitmap_tree_rotate_left (bitmap_element * &t) | |
445 | { | |
446 | bitmap_element *e = t->next; | |
447 | t->next = t->next->prev; | |
448 | e->prev = t; | |
449 | t = e; | |
450 | } | |
451 | ||
452 | static inline void | |
453 | bitmap_tree_rotate_right (bitmap_element * &t) | |
454 | { | |
455 | bitmap_element *e = t->prev; | |
456 | t->prev = t->prev->next; | |
457 | e->next = t; | |
458 | t = e; | |
459 | } | |
460 | ||
461 | static bitmap_element * | |
462 | bitmap_tree_splay (bitmap head, bitmap_element *t, unsigned int indx) | |
463 | { | |
464 | bitmap_element N, *l, *r; | |
465 | ||
466 | if (t == NULL) | |
467 | return NULL; | |
468 | ||
469 | bitmap_usage *usage = NULL; | |
470 | if (GATHER_STATISTICS) | |
471 | usage = bitmap_mem_desc.get_descriptor_for_instance (head); | |
472 | ||
473 | N.prev = N.next = NULL; | |
474 | l = r = &N; | |
475 | ||
476 | while (indx != t->indx) | |
477 | { | |
478 | if (GATHER_STATISTICS && usage) | |
479 | usage->m_search_iter++; | |
480 | ||
481 | if (indx < t->indx) | |
482 | { | |
483 | if (t->prev != NULL && indx < t->prev->indx) | |
484 | bitmap_tree_rotate_right (t); | |
485 | if (t->prev == NULL) | |
486 | break; | |
487 | bitmap_tree_link_right (t, r); | |
488 | } | |
489 | else if (indx > t->indx) | |
490 | { | |
491 | if (t->next != NULL && indx > t->next->indx) | |
492 | bitmap_tree_rotate_left (t); | |
493 | if (t->next == NULL) | |
494 | break; | |
495 | bitmap_tree_link_left (t, l); | |
496 | } | |
497 | } | |
498 | ||
499 | l->next = t->prev; | |
500 | r->prev = t->next; | |
501 | t->prev = N.next; | |
502 | t->next = N.prev; | |
503 | return t; | |
504 | } | |
505 | ||
506 | /* Link bitmap element E into the current bitmap splay tree. */ | |
507 | ||
508 | static inline void | |
509 | bitmap_tree_link_element (bitmap head, bitmap_element *e) | |
510 | { | |
511 | if (head->first == NULL) | |
512 | e->prev = e->next = NULL; | |
513 | else | |
514 | { | |
515 | bitmap_element *t = bitmap_tree_splay (head, head->first, e->indx); | |
516 | if (e->indx < t->indx) | |
517 | { | |
518 | e->prev = t->prev; | |
519 | e->next = t; | |
520 | t->prev = NULL; | |
521 | } | |
522 | else if (e->indx > t->indx) | |
523 | { | |
524 | e->next = t->next; | |
525 | e->prev = t; | |
526 | t->next = NULL; | |
527 | } | |
528 | else | |
529 | gcc_unreachable (); | |
530 | } | |
531 | head->first = e; | |
532 | head->current = e; | |
533 | head->indx = e->indx; | |
534 | } | |
535 | ||
536 | /* Unlink bitmap element E from the current bitmap splay tree, | |
537 | and return it to the freelist. */ | |
538 | ||
539 | static void | |
540 | bitmap_tree_unlink_element (bitmap head, bitmap_element *e) | |
541 | { | |
542 | bitmap_element *t = bitmap_tree_splay (head, head->first, e->indx); | |
543 | ||
544 | gcc_checking_assert (t == e); | |
545 | ||
546 | if (e->prev == NULL) | |
547 | t = e->next; | |
548 | else | |
549 | { | |
550 | t = bitmap_tree_splay (head, e->prev, e->indx); | |
551 | t->next = e->next; | |
552 | } | |
553 | head->first = t; | |
554 | head->current = t; | |
555 | head->indx = (t != NULL) ? t->indx : 0; | |
556 | ||
557 | bitmap_elem_to_freelist (head, e); | |
558 | } | |
559 | ||
560 | /* Return the element for INDX, or NULL if the element doesn't exist. */ | |
561 | ||
562 | static inline bitmap_element * | |
563 | bitmap_tree_find_element (bitmap head, unsigned int indx) | |
564 | { | |
565 | if (head->current == NULL | |
566 | || head->indx == indx) | |
567 | return head->current; | |
568 | ||
569 | /* Usage can be NULL due to allocated bitmaps for which we do not | |
570 | call initialize function. */ | |
571 | bitmap_usage *usage = NULL; | |
572 | if (GATHER_STATISTICS) | |
573 | usage = bitmap_mem_desc.get_descriptor_for_instance (head); | |
574 | ||
575 | /* This bitmap has more than one element, and we're going to look | |
576 | through the elements list. Count that as a search. */ | |
577 | if (GATHER_STATISTICS && usage) | |
578 | usage->m_nsearches++; | |
579 | ||
580 | bitmap_element *element = bitmap_tree_splay (head, head->first, indx); | |
581 | gcc_checking_assert (element != NULL); | |
582 | head->first = element; | |
583 | head->current = element; | |
584 | head->indx = element->indx; | |
585 | if (element->indx != indx) | |
586 | element = 0; | |
587 | return element; | |
588 | } | |
589 | \f | |
590 | /* Converting bitmap views from linked-list to tree and vice versa. */ | |
591 | ||
592 | /* Splice element E and all elements with a larger index from | |
593 | bitmap HEAD, convert the spliced elements to the linked-list | |
594 | view, and return the head of the list (which should be E again), */ | |
595 | ||
596 | static bitmap_element * | |
597 | bitmap_tree_listify_from (bitmap head, bitmap_element *e) | |
598 | { | |
599 | bitmap_element *t, *erb; | |
600 | ||
601 | /* Detach the right branch from E (all elements with indx > E->indx), | |
602 | and splay E to the root. */ | |
603 | erb = e->next; | |
604 | e->next = NULL; | |
605 | t = bitmap_tree_splay (head, head->first, e->indx); | |
606 | gcc_checking_assert (t == e); | |
607 | ||
608 | /* Because E has no right branch, and we rotated it to the root, | |
609 | the left branch is the new root. */ | |
610 | t = e->prev; | |
611 | head->first = t; | |
612 | head->current = t; | |
613 | head->indx = (t != NULL) ? t->indx : 0; | |
614 | ||
615 | /* Detach the tree from E, and re-attach the right branch of E. */ | |
616 | e->prev = NULL; | |
617 | e->next = erb; | |
618 | ||
619 | /* The tree is now valid again. Now we need to "un-tree" E. | |
620 | It is imperative that a non-recursive implementation is used | |
621 | for this, because splay trees have a worst case depth of O(N) | |
622 | for a tree with N nodes. A recursive implementation could | |
623 | result in a stack overflow for a sufficiently large, unbalanced | |
624 | bitmap tree. */ | |
625 | ||
626 | auto_vec<bitmap_element *, 32> stack; | |
627 | auto_vec<bitmap_element *, 32> sorted_elements; | |
628 | bitmap_element *n = e; | |
629 | ||
630 | while (true) | |
631 | { | |
632 | while (n != NULL) | |
633 | { | |
634 | stack.safe_push (n); | |
635 | n = n->prev; | |
636 | } | |
637 | ||
638 | if (stack.is_empty ()) | |
639 | break; | |
640 | ||
641 | n = stack.pop (); | |
642 | sorted_elements.safe_push (n); | |
643 | n = n->next; | |
644 | } | |
645 | ||
646 | gcc_assert (sorted_elements[0] == e); | |
647 | ||
648 | bitmap_element *prev = NULL; | |
649 | unsigned ix; | |
650 | FOR_EACH_VEC_ELT (sorted_elements, ix, n) | |
651 | { | |
652 | if (prev != NULL) | |
653 | prev->next = n; | |
654 | n->prev = prev; | |
655 | n->next = NULL; | |
656 | prev = n; | |
657 | } | |
658 | ||
659 | return e; | |
660 | } | |
661 | ||
662 | /* Convert bitmap HEAD from splay-tree view to linked-list view. */ | |
663 | ||
664 | void | |
665 | bitmap_list_view (bitmap head) | |
666 | { | |
667 | bitmap_element *ptr; | |
668 | ||
669 | gcc_assert (head->tree_form); | |
670 | ||
671 | ptr = head->first; | |
672 | if (ptr) | |
673 | { | |
674 | while (ptr->prev) | |
675 | bitmap_tree_rotate_right (ptr); | |
676 | head->first = ptr; | |
677 | head->first = bitmap_tree_listify_from (head, ptr); | |
7932a3db | 678 | } |
d1e14d97 SB |
679 | |
680 | head->tree_form = false; | |
896db49a RB |
681 | if (!head->current) |
682 | { | |
683 | head->current = head->first; | |
684 | head->indx = head->current ? head->current->indx : 0; | |
685 | } | |
7932a3db NS |
686 | } |
687 | ||
d1e14d97 SB |
688 | /* Convert bitmap HEAD from linked-list view to splay-tree view. |
689 | This is simply a matter of dropping the prev or next pointers | |
690 | and setting the tree_form flag. The tree will balance itself | |
691 | if and when it is used. */ | |
692 | ||
693 | void | |
694 | bitmap_tree_view (bitmap head) | |
695 | { | |
696 | bitmap_element *ptr; | |
697 | ||
698 | gcc_assert (! head->tree_form); | |
699 | ||
700 | ptr = head->first; | |
701 | while (ptr) | |
702 | { | |
703 | ptr->prev = NULL; | |
704 | ptr = ptr->next; | |
705 | } | |
706 | ||
707 | head->tree_form = true; | |
708 | } | |
709 | \f | |
710 | /* Clear a bitmap by freeing all its elements. */ | |
7932a3db | 711 | |
5fd8300b | 712 | void |
7932a3db | 713 | bitmap_clear (bitmap head) |
87e08c69 | 714 | { |
d1e14d97 SB |
715 | if (head->first == NULL) |
716 | return; | |
717 | if (head->tree_form) | |
718 | { | |
719 | bitmap_element *e, *t; | |
720 | for (e = head->first; e->prev; e = e->prev) | |
721 | /* Loop to find the element with the smallest index. */ ; | |
722 | t = bitmap_tree_splay (head, head->first, e->indx); | |
723 | gcc_checking_assert (t == e); | |
724 | head->first = t; | |
725 | } | |
726 | bitmap_elt_clear_from (head, head->first); | |
7932a3db NS |
727 | } |
728 | \f | |
729 | /* Initialize a bitmap obstack. If BIT_OBSTACK is NULL, initialize | |
730 | the default bitmap obstack. */ | |
731 | ||
732 | void | |
733 | bitmap_obstack_initialize (bitmap_obstack *bit_obstack) | |
734 | { | |
735 | if (!bit_obstack) | |
a68ab351 JJ |
736 | { |
737 | if (bitmap_default_obstack_depth++) | |
738 | return; | |
739 | bit_obstack = &bitmap_default_obstack; | |
740 | } | |
7932a3db NS |
741 | |
742 | #if !defined(__GNUC__) || (__GNUC__ < 2) | |
743 | #define __alignof__(type) 0 | |
744 | #endif | |
745 | ||
746 | bit_obstack->elements = NULL; | |
747 | bit_obstack->heads = NULL; | |
748 | obstack_specify_allocation (&bit_obstack->obstack, OBSTACK_CHUNK_SIZE, | |
749 | __alignof__ (bitmap_element), | |
750 | obstack_chunk_alloc, | |
751 | obstack_chunk_free); | |
87e08c69 RH |
752 | } |
753 | ||
7932a3db NS |
754 | /* Release the memory from a bitmap obstack. If BIT_OBSTACK is NULL, |
755 | release the default bitmap obstack. */ | |
756 | ||
757 | void | |
758 | bitmap_obstack_release (bitmap_obstack *bit_obstack) | |
759 | { | |
760 | if (!bit_obstack) | |
a68ab351 JJ |
761 | { |
762 | if (--bitmap_default_obstack_depth) | |
763 | { | |
764 | gcc_assert (bitmap_default_obstack_depth > 0); | |
765 | return; | |
766 | } | |
767 | bit_obstack = &bitmap_default_obstack; | |
768 | } | |
c22cacf3 | 769 | |
7932a3db NS |
770 | bit_obstack->elements = NULL; |
771 | bit_obstack->heads = NULL; | |
772 | obstack_free (&bit_obstack->obstack, NULL); | |
773 | } | |
774 | ||
775 | /* Create a new bitmap on an obstack. If BIT_OBSTACK is NULL, create | |
776 | it on the default bitmap obstack. */ | |
777 | ||
778 | bitmap | |
3fe793df | 779 | bitmap_alloc (bitmap_obstack *bit_obstack MEM_STAT_DECL) |
7932a3db NS |
780 | { |
781 | bitmap map; | |
782 | ||
783 | if (!bit_obstack) | |
a2e9032d RB |
784 | { |
785 | gcc_assert (bitmap_default_obstack_depth > 0); | |
786 | bit_obstack = &bitmap_default_obstack; | |
787 | } | |
7932a3db NS |
788 | map = bit_obstack->heads; |
789 | if (map) | |
99b1c316 | 790 | bit_obstack->heads = (class bitmap_head *) map->first; |
7932a3db NS |
791 | else |
792 | map = XOBNEW (&bit_obstack->obstack, bitmap_head); | |
2a1a5f30 | 793 | bitmap_initialize (map, bit_obstack PASS_MEM_STAT); |
7aa6d18a SB |
794 | |
795 | if (GATHER_STATISTICS) | |
796 | register_overhead (map, sizeof (bitmap_head)); | |
7932a3db NS |
797 | |
798 | return map; | |
799 | } | |
800 | ||
801 | /* Create a new GCd bitmap. */ | |
802 | ||
803 | bitmap | |
3fe793df | 804 | bitmap_gc_alloc (ALONE_MEM_STAT_DECL) |
7932a3db NS |
805 | { |
806 | bitmap map; | |
807 | ||
766090c2 | 808 | map = ggc_alloc<bitmap_head> (); |
2a1a5f30 | 809 | bitmap_initialize (map, NULL PASS_MEM_STAT); |
7aa6d18a SB |
810 | |
811 | if (GATHER_STATISTICS) | |
812 | register_overhead (map, sizeof (bitmap_head)); | |
7932a3db NS |
813 | |
814 | return map; | |
815 | } | |
816 | ||
7932a3db NS |
817 | /* Release an obstack allocated bitmap. */ |
818 | ||
819 | void | |
820 | bitmap_obstack_free (bitmap map) | |
821 | { | |
cc175e7c NS |
822 | if (map) |
823 | { | |
824 | bitmap_clear (map); | |
dba2cc0c | 825 | map->first = (bitmap_element *) map->obstack->heads; |
7aa6d18a SB |
826 | |
827 | if (GATHER_STATISTICS) | |
7664eeb7 | 828 | release_overhead (map, sizeof (bitmap_head), true); |
7aa6d18a | 829 | |
cc175e7c NS |
830 | map->obstack->heads = map; |
831 | } | |
7932a3db NS |
832 | } |
833 | ||
7932a3db | 834 | \f |
096ab9ea RK |
835 | /* Return nonzero if all bits in an element are zero. */ |
836 | ||
47c321d4 | 837 | static inline int |
e326eeb5 | 838 | bitmap_element_zerop (const bitmap_element *element) |
096ab9ea RK |
839 | { |
840 | #if BITMAP_ELEMENT_WORDS == 2 | |
841 | return (element->bits[0] | element->bits[1]) == 0; | |
842 | #else | |
65a6f342 | 843 | unsigned i; |
096ab9ea RK |
844 | |
845 | for (i = 0; i < BITMAP_ELEMENT_WORDS; i++) | |
846 | if (element->bits[i] != 0) | |
847 | return 0; | |
848 | ||
849 | return 1; | |
850 | #endif | |
851 | } | |
852 | \f | |
a615c28a | 853 | /* Copy a bitmap to another bitmap. */ |
096ab9ea RK |
854 | |
855 | void | |
e326eeb5 | 856 | bitmap_copy (bitmap to, const_bitmap from) |
096ab9ea | 857 | { |
e326eeb5 KG |
858 | const bitmap_element *from_ptr; |
859 | bitmap_element *to_ptr = 0; | |
096ab9ea | 860 | |
d1e14d97 SB |
861 | gcc_checking_assert (!to->tree_form && !from->tree_form); |
862 | ||
096ab9ea RK |
863 | bitmap_clear (to); |
864 | ||
f9da5064 | 865 | /* Copy elements in forward direction one at a time. */ |
096ab9ea RK |
866 | for (from_ptr = from->first; from_ptr; from_ptr = from_ptr->next) |
867 | { | |
e2500fed | 868 | bitmap_element *to_elt = bitmap_element_allocate (to); |
096ab9ea RK |
869 | |
870 | to_elt->indx = from_ptr->indx; | |
fd6132db | 871 | memcpy (to_elt->bits, from_ptr->bits, sizeof (to_elt->bits)); |
096ab9ea | 872 | |
d1e14d97 SB |
873 | /* Here we have a special case of bitmap_list_link_element, |
874 | for the case where we know the links are being entered | |
875 | in sequence. */ | |
096ab9ea RK |
876 | if (to_ptr == 0) |
877 | { | |
878 | to->first = to->current = to_elt; | |
879 | to->indx = from_ptr->indx; | |
880 | to_elt->next = to_elt->prev = 0; | |
881 | } | |
882 | else | |
883 | { | |
884 | to_elt->prev = to_ptr; | |
885 | to_elt->next = 0; | |
886 | to_ptr->next = to_elt; | |
887 | } | |
888 | ||
889 | to_ptr = to_elt; | |
890 | } | |
891 | } | |
43331dfb RB |
892 | |
893 | /* Move a bitmap to another bitmap. */ | |
894 | ||
895 | void | |
896 | bitmap_move (bitmap to, bitmap from) | |
897 | { | |
898 | gcc_assert (to->obstack == from->obstack); | |
899 | ||
900 | bitmap_clear (to); | |
901 | ||
7664eeb7 | 902 | size_t sz = 0; |
43331dfb RB |
903 | if (GATHER_STATISTICS) |
904 | { | |
43331dfb RB |
905 | for (bitmap_element *e = to->first; e; e = e->next) |
906 | sz += sizeof (bitmap_element); | |
907 | register_overhead (to, sz); | |
43331dfb | 908 | } |
7664eeb7 ML |
909 | |
910 | *to = *from; | |
911 | ||
912 | if (GATHER_STATISTICS) | |
913 | release_overhead (from, sz, false); | |
43331dfb | 914 | } |
096ab9ea | 915 | \f |
5f0d975b | 916 | /* Clear a single bit in a bitmap. Return true if the bit changed. */ |
096ab9ea | 917 | |
5f0d975b | 918 | bool |
4682ae04 | 919 | bitmap_clear_bit (bitmap head, int bit) |
096ab9ea | 920 | { |
d1e14d97 SB |
921 | unsigned int indx = bit / BITMAP_ELEMENT_ALL_BITS; |
922 | bitmap_element *ptr; | |
096ab9ea | 923 | |
d1e14d97 SB |
924 | if (!head->tree_form) |
925 | ptr = bitmap_list_find_element (head, indx); | |
926 | else | |
927 | ptr = bitmap_tree_find_element (head, indx); | |
096ab9ea RK |
928 | if (ptr != 0) |
929 | { | |
72e42e26 SB |
930 | unsigned bit_num = bit % BITMAP_WORD_BITS; |
931 | unsigned word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; | |
5f0d975b RG |
932 | BITMAP_WORD bit_val = ((BITMAP_WORD) 1) << bit_num; |
933 | bool res = (ptr->bits[word_num] & bit_val) != 0; | |
934 | if (res) | |
07309d58 UB |
935 | { |
936 | ptr->bits[word_num] &= ~bit_val; | |
937 | /* If we cleared the entire word, free up the element. */ | |
938 | if (!ptr->bits[word_num] | |
939 | && bitmap_element_zerop (ptr)) | |
d1e14d97 SB |
940 | { |
941 | if (!head->tree_form) | |
942 | bitmap_list_unlink_element (head, ptr); | |
943 | else | |
944 | bitmap_tree_unlink_element (head, ptr); | |
945 | } | |
07309d58 | 946 | } |
5f0d975b RG |
947 | |
948 | return res; | |
096ab9ea | 949 | } |
5f0d975b RG |
950 | |
951 | return false; | |
096ab9ea RK |
952 | } |
953 | ||
5f0d975b | 954 | /* Set a single bit in a bitmap. Return true if the bit changed. */ |
096ab9ea | 955 | |
5f0d975b | 956 | bool |
4682ae04 | 957 | bitmap_set_bit (bitmap head, int bit) |
096ab9ea | 958 | { |
d1e14d97 SB |
959 | unsigned indx = bit / BITMAP_ELEMENT_ALL_BITS; |
960 | bitmap_element *ptr; | |
961 | if (!head->tree_form) | |
962 | ptr = bitmap_list_find_element (head, indx); | |
963 | else | |
964 | ptr = bitmap_tree_find_element (head, indx); | |
72e42e26 SB |
965 | unsigned word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; |
966 | unsigned bit_num = bit % BITMAP_WORD_BITS; | |
967 | BITMAP_WORD bit_val = ((BITMAP_WORD) 1) << bit_num; | |
096ab9ea | 968 | |
d1e14d97 | 969 | if (ptr != 0) |
5f0d975b RG |
970 | { |
971 | bool res = (ptr->bits[word_num] & bit_val) == 0; | |
972 | if (res) | |
973 | ptr->bits[word_num] |= bit_val; | |
974 | return res; | |
975 | } | |
d1e14d97 SB |
976 | |
977 | ptr = bitmap_element_allocate (head); | |
978 | ptr->indx = bit / BITMAP_ELEMENT_ALL_BITS; | |
979 | ptr->bits[word_num] = bit_val; | |
980 | if (!head->tree_form) | |
981 | bitmap_list_link_element (head, ptr); | |
982 | else | |
983 | bitmap_tree_link_element (head, ptr); | |
984 | return true; | |
096ab9ea | 985 | } |
a615c28a | 986 | |
096ab9ea RK |
987 | /* Return whether a bit is set within a bitmap. */ |
988 | ||
73658e70 | 989 | bool |
148909bc | 990 | bitmap_bit_p (const_bitmap head, int bit) |
096ab9ea | 991 | { |
d1e14d97 | 992 | unsigned int indx = bit / BITMAP_ELEMENT_ALL_BITS; |
148909bc | 993 | const bitmap_element *ptr; |
096ab9ea RK |
994 | unsigned bit_num; |
995 | unsigned word_num; | |
996 | ||
d1e14d97 | 997 | if (!head->tree_form) |
148909bc | 998 | ptr = bitmap_list_find_element (const_cast<bitmap> (head), indx); |
d1e14d97 | 999 | else |
148909bc | 1000 | ptr = bitmap_tree_find_element (const_cast<bitmap> (head), indx); |
096ab9ea RK |
1001 | if (ptr == 0) |
1002 | return 0; | |
1003 | ||
72e42e26 SB |
1004 | bit_num = bit % BITMAP_WORD_BITS; |
1005 | word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; | |
096ab9ea | 1006 | |
8229306b | 1007 | return (ptr->bits[word_num] >> bit_num) & 1; |
096ab9ea RK |
1008 | } |
1009 | \f | |
5ad089a3 AM |
1010 | /* Set CHUNK_SIZE bits at a time in bitmap HEAD. |
1011 | Store CHUNK_VALUE starting at bits CHUNK * chunk_size. | |
1012 | This is the set routine for viewing bitmap as a multi-bit sparse array. */ | |
1013 | ||
1014 | void | |
1015 | bitmap_set_aligned_chunk (bitmap head, unsigned int chunk, | |
1016 | unsigned int chunk_size, BITMAP_WORD chunk_value) | |
1017 | { | |
1018 | // Ensure chunk size is a power of 2 and fits in BITMAP_WORD. | |
1019 | gcc_checking_assert (pow2p_hwi (chunk_size)); | |
1020 | gcc_checking_assert (chunk_size < (sizeof (BITMAP_WORD) * CHAR_BIT)); | |
1021 | ||
1022 | // Ensure chunk_value is within range of chunk_size bits. | |
1023 | BITMAP_WORD max_value = (1 << chunk_size) - 1; | |
1024 | gcc_checking_assert (chunk_value <= max_value); | |
1025 | ||
1026 | unsigned bit = chunk * chunk_size; | |
1027 | unsigned indx = bit / BITMAP_ELEMENT_ALL_BITS; | |
1028 | bitmap_element *ptr; | |
1029 | if (!head->tree_form) | |
1030 | ptr = bitmap_list_find_element (head, indx); | |
1031 | else | |
1032 | ptr = bitmap_tree_find_element (head, indx); | |
1033 | unsigned word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; | |
1034 | unsigned bit_num = bit % BITMAP_WORD_BITS; | |
1035 | BITMAP_WORD bit_val = chunk_value << bit_num; | |
1036 | BITMAP_WORD mask = ~(max_value << bit_num); | |
1037 | ||
1038 | if (ptr != 0) | |
1039 | { | |
1040 | ptr->bits[word_num] &= mask; | |
1041 | ptr->bits[word_num] |= bit_val; | |
1042 | return; | |
1043 | } | |
1044 | ||
1045 | ptr = bitmap_element_allocate (head); | |
1046 | ptr->indx = bit / BITMAP_ELEMENT_ALL_BITS; | |
1047 | ptr->bits[word_num] = bit_val; | |
1048 | if (!head->tree_form) | |
1049 | bitmap_list_link_element (head, ptr); | |
1050 | else | |
1051 | bitmap_tree_link_element (head, ptr); | |
1052 | } | |
1053 | ||
1054 | /* This is the get routine for viewing bitmap as a multi-bit sparse array. | |
1055 | Return a set of CHUNK_SIZE consecutive bits from HEAD, starting at bit | |
1056 | CHUNK * chunk_size. */ | |
1057 | ||
1058 | BITMAP_WORD | |
1059 | bitmap_get_aligned_chunk (const_bitmap head, unsigned int chunk, | |
1060 | unsigned int chunk_size) | |
1061 | { | |
1062 | // Ensure chunk size is a power of 2, fits in BITMAP_WORD and is in range. | |
1063 | gcc_checking_assert (pow2p_hwi (chunk_size)); | |
1064 | gcc_checking_assert (chunk_size < (sizeof (BITMAP_WORD) * CHAR_BIT)); | |
1065 | ||
1066 | BITMAP_WORD max_value = (1 << chunk_size) - 1; | |
1067 | unsigned bit = chunk * chunk_size; | |
1068 | unsigned int indx = bit / BITMAP_ELEMENT_ALL_BITS; | |
1069 | const bitmap_element *ptr; | |
1070 | unsigned bit_num; | |
1071 | unsigned word_num; | |
1072 | ||
1073 | if (!head->tree_form) | |
1074 | ptr = bitmap_list_find_element (const_cast<bitmap> (head), indx); | |
1075 | else | |
1076 | ptr = bitmap_tree_find_element (const_cast<bitmap> (head), indx); | |
1077 | if (ptr == 0) | |
1078 | return 0; | |
1079 | ||
1080 | bit_num = bit % BITMAP_WORD_BITS; | |
1081 | word_num = bit / BITMAP_WORD_BITS % BITMAP_ELEMENT_WORDS; | |
1082 | ||
1083 | // Return 4 bits. | |
1084 | return (ptr->bits[word_num] >> bit_num) & max_value; | |
1085 | } | |
1086 | \f | |
1bc40c7e KZ |
1087 | #if GCC_VERSION < 3400 |
1088 | /* Table of number of set bits in a character, indexed by value of char. */ | |
e326eeb5 | 1089 | static const unsigned char popcount_table[] = |
1bc40c7e KZ |
1090 | { |
1091 | 0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5, | |
1092 | 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, | |
1093 | 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, | |
1094 | 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, | |
1095 | 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6, | |
1096 | 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, | |
1097 | 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7, | |
1098 | 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8, | |
1099 | }; | |
1100 | ||
1101 | static unsigned long | |
1102 | bitmap_popcount (BITMAP_WORD a) | |
1103 | { | |
1104 | unsigned long ret = 0; | |
1105 | unsigned i; | |
1106 | ||
1107 | /* Just do this the table way for now */ | |
1108 | for (i = 0; i < BITMAP_WORD_BITS; i+= 8) | |
1109 | ret += popcount_table[(a >> i) & 0xff]; | |
1110 | return ret; | |
1111 | } | |
1112 | #endif | |
478baf91 JL |
1113 | |
1114 | /* Count and return the number of bits set in the bitmap word BITS. */ | |
1115 | static unsigned long | |
1116 | bitmap_count_bits_in_word (const BITMAP_WORD *bits) | |
1117 | { | |
1118 | unsigned long count = 0; | |
1119 | ||
1120 | for (unsigned ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) | |
1121 | { | |
1122 | #if GCC_VERSION >= 3400 | |
1123 | /* Note that popcountl matches BITMAP_WORD in type, so the actual size | |
1124 | of BITMAP_WORD is not material. */ | |
1125 | count += __builtin_popcountl (bits[ix]); | |
1126 | #else | |
1127 | count += bitmap_popcount (bits[ix]); | |
1128 | #endif | |
1129 | } | |
1130 | return count; | |
1131 | } | |
1132 | ||
1bc40c7e KZ |
1133 | /* Count the number of bits set in the bitmap, and return it. */ |
1134 | ||
1135 | unsigned long | |
e326eeb5 | 1136 | bitmap_count_bits (const_bitmap a) |
1bc40c7e KZ |
1137 | { |
1138 | unsigned long count = 0; | |
e326eeb5 | 1139 | const bitmap_element *elt; |
1bc40c7e | 1140 | |
d1e14d97 | 1141 | gcc_checking_assert (!a->tree_form); |
1bc40c7e | 1142 | for (elt = a->first; elt; elt = elt->next) |
478baf91 JL |
1143 | count += bitmap_count_bits_in_word (elt->bits); |
1144 | ||
1145 | return count; | |
1146 | } | |
1147 | ||
1148 | /* Count the number of unique bits set in A and B and return it. */ | |
1149 | ||
1150 | unsigned long | |
1151 | bitmap_count_unique_bits (const_bitmap a, const_bitmap b) | |
1152 | { | |
1153 | unsigned long count = 0; | |
1154 | const bitmap_element *elt_a, *elt_b; | |
1155 | ||
1156 | for (elt_a = a->first, elt_b = b->first; elt_a && elt_b; ) | |
1bc40c7e | 1157 | { |
478baf91 JL |
1158 | /* If we're at different indices, then count all the bits |
1159 | in the lower element. If we're at the same index, then | |
1160 | count the bits in the IOR of the two elements. */ | |
1161 | if (elt_a->indx < elt_b->indx) | |
1bc40c7e | 1162 | { |
478baf91 JL |
1163 | count += bitmap_count_bits_in_word (elt_a->bits); |
1164 | elt_a = elt_a->next; | |
1165 | } | |
1166 | else if (elt_b->indx < elt_a->indx) | |
1167 | { | |
1168 | count += bitmap_count_bits_in_word (elt_b->bits); | |
1169 | elt_b = elt_b->next; | |
1170 | } | |
1171 | else | |
1172 | { | |
1173 | BITMAP_WORD bits[BITMAP_ELEMENT_WORDS]; | |
1174 | for (unsigned ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) | |
1175 | bits[ix] = elt_a->bits[ix] | elt_b->bits[ix]; | |
1176 | count += bitmap_count_bits_in_word (bits); | |
1177 | elt_a = elt_a->next; | |
1178 | elt_b = elt_b->next; | |
1bc40c7e KZ |
1179 | } |
1180 | } | |
1181 | return count; | |
1182 | } | |
c22cacf3 | 1183 | |
76e910c6 RG |
1184 | /* Return true if the bitmap has a single bit set. Otherwise return |
1185 | false. */ | |
1186 | ||
1187 | bool | |
1188 | bitmap_single_bit_set_p (const_bitmap a) | |
1189 | { | |
1190 | unsigned long count = 0; | |
1191 | const bitmap_element *elt; | |
1192 | unsigned ix; | |
1193 | ||
1194 | if (bitmap_empty_p (a)) | |
1195 | return false; | |
1196 | ||
1197 | elt = a->first; | |
d1e14d97 | 1198 | |
76e910c6 RG |
1199 | /* As there are no completely empty bitmap elements, a second one |
1200 | means we have more than one bit set. */ | |
d1e14d97 SB |
1201 | if (elt->next != NULL |
1202 | && (!a->tree_form || elt->prev != NULL)) | |
76e910c6 RG |
1203 | return false; |
1204 | ||
1205 | for (ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) | |
1206 | { | |
1207 | #if GCC_VERSION >= 3400 | |
1208 | /* Note that popcountl matches BITMAP_WORD in type, so the actual size | |
1209 | of BITMAP_WORD is not material. */ | |
1210 | count += __builtin_popcountl (elt->bits[ix]); | |
1211 | #else | |
1212 | count += bitmap_popcount (elt->bits[ix]); | |
1213 | #endif | |
1214 | if (count > 1) | |
1215 | return false; | |
1216 | } | |
1217 | ||
1218 | return count == 1; | |
1219 | } | |
1bc40c7e KZ |
1220 | |
1221 | ||
65a6f342 | 1222 | /* Return the bit number of the first set bit in the bitmap. The |
f548ece7 | 1223 | bitmap must be non-empty. When CLEAR is true it clears the bit. */ |
87e08c69 | 1224 | |
f548ece7 RB |
1225 | static unsigned |
1226 | bitmap_first_set_bit_worker (bitmap a, bool clear) | |
87e08c69 | 1227 | { |
f548ece7 | 1228 | bitmap_element *elt = a->first; |
65a6f342 | 1229 | unsigned bit_no; |
72e42e26 | 1230 | BITMAP_WORD word; |
65a6f342 | 1231 | unsigned ix; |
c22cacf3 | 1232 | |
377002a9 | 1233 | gcc_checking_assert (elt); |
d1e14d97 SB |
1234 | |
1235 | if (a->tree_form) | |
1236 | while (elt->prev) | |
1237 | elt = elt->prev; | |
1238 | ||
65a6f342 NS |
1239 | bit_no = elt->indx * BITMAP_ELEMENT_ALL_BITS; |
1240 | for (ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) | |
1241 | { | |
1242 | word = elt->bits[ix]; | |
1243 | if (word) | |
1244 | goto found_bit; | |
1245 | } | |
298e6adc | 1246 | gcc_unreachable (); |
65a6f342 NS |
1247 | found_bit: |
1248 | bit_no += ix * BITMAP_WORD_BITS; | |
87e08c69 | 1249 | |
65a6f342 | 1250 | #if GCC_VERSION >= 3004 |
c3284718 | 1251 | gcc_assert (sizeof (long) == sizeof (word)); |
65a6f342 | 1252 | bit_no += __builtin_ctzl (word); |
87e08c69 | 1253 | #else |
65a6f342 NS |
1254 | /* Binary search for the first set bit. */ |
1255 | #if BITMAP_WORD_BITS > 64 | |
1256 | #error "Fill out the table." | |
87e08c69 | 1257 | #endif |
65a6f342 NS |
1258 | #if BITMAP_WORD_BITS > 32 |
1259 | if (!(word & 0xffffffff)) | |
1260 | word >>= 32, bit_no += 32; | |
87e08c69 | 1261 | #endif |
65a6f342 NS |
1262 | if (!(word & 0xffff)) |
1263 | word >>= 16, bit_no += 16; | |
1264 | if (!(word & 0xff)) | |
1265 | word >>= 8, bit_no += 8; | |
1266 | if (!(word & 0xf)) | |
1267 | word >>= 4, bit_no += 4; | |
1268 | if (!(word & 0x3)) | |
1269 | word >>= 2, bit_no += 2; | |
1270 | if (!(word & 0x1)) | |
1271 | word >>= 1, bit_no += 1; | |
c22cacf3 | 1272 | |
377002a9 | 1273 | gcc_checking_assert (word & 1); |
87e08c69 | 1274 | #endif |
f548ece7 RB |
1275 | |
1276 | if (clear) | |
1277 | { | |
1278 | elt->bits[ix] &= ~((BITMAP_WORD) 1 << (bit_no % BITMAP_WORD_BITS)); | |
1279 | /* If we cleared the entire word, free up the element. */ | |
1280 | if (!elt->bits[ix] | |
1281 | && bitmap_element_zerop (elt)) | |
1282 | { | |
1283 | if (!a->tree_form) | |
1284 | bitmap_list_unlink_element (a, elt); | |
1285 | else | |
1286 | bitmap_tree_unlink_element (a, elt); | |
1287 | } | |
1288 | } | |
1289 | ||
65a6f342 | 1290 | return bit_no; |
87e08c69 | 1291 | } |
12802c2b | 1292 | |
f548ece7 RB |
1293 | /* Return the bit number of the first set bit in the bitmap. The |
1294 | bitmap must be non-empty. */ | |
1295 | ||
1296 | unsigned | |
1297 | bitmap_first_set_bit (const_bitmap a) | |
1298 | { | |
1299 | return bitmap_first_set_bit_worker (const_cast<bitmap> (a), false); | |
1300 | } | |
1301 | ||
1302 | /* Return and clear the bit number of the first set bit in the bitmap. The | |
1303 | bitmap must be non-empty. */ | |
1304 | ||
1305 | unsigned | |
1306 | bitmap_clear_first_set_bit (bitmap a) | |
1307 | { | |
1308 | return bitmap_first_set_bit_worker (a, true); | |
1309 | } | |
1310 | ||
12802c2b JH |
1311 | /* Return the bit number of the first set bit in the bitmap. The |
1312 | bitmap must be non-empty. */ | |
1313 | ||
1314 | unsigned | |
1315 | bitmap_last_set_bit (const_bitmap a) | |
1316 | { | |
d1e14d97 | 1317 | const bitmap_element *elt; |
12802c2b JH |
1318 | unsigned bit_no; |
1319 | BITMAP_WORD word; | |
1320 | int ix; | |
1321 | ||
d1e14d97 SB |
1322 | if (a->tree_form) |
1323 | elt = a->first; | |
1324 | else | |
1325 | elt = a->current ? a->current : a->first; | |
377002a9 | 1326 | gcc_checking_assert (elt); |
d1e14d97 | 1327 | |
12802c2b JH |
1328 | while (elt->next) |
1329 | elt = elt->next; | |
d1e14d97 | 1330 | |
12802c2b | 1331 | bit_no = elt->indx * BITMAP_ELEMENT_ALL_BITS; |
566422e0 | 1332 | for (ix = BITMAP_ELEMENT_WORDS - 1; ix >= 1; ix--) |
12802c2b JH |
1333 | { |
1334 | word = elt->bits[ix]; | |
1335 | if (word) | |
1336 | goto found_bit; | |
1337 | } | |
566422e0 | 1338 | gcc_assert (elt->bits[ix] != 0); |
12802c2b JH |
1339 | found_bit: |
1340 | bit_no += ix * BITMAP_WORD_BITS; | |
12802c2b | 1341 | #if GCC_VERSION >= 3004 |
c3284718 | 1342 | gcc_assert (sizeof (long) == sizeof (word)); |
d630245f | 1343 | bit_no += BITMAP_WORD_BITS - __builtin_clzl (word) - 1; |
12802c2b | 1344 | #else |
d630245f SB |
1345 | /* Hopefully this is a twos-complement host... */ |
1346 | BITMAP_WORD x = word; | |
1347 | x |= (x >> 1); | |
1348 | x |= (x >> 2); | |
1349 | x |= (x >> 4); | |
1350 | x |= (x >> 8); | |
1351 | x |= (x >> 16); | |
12802c2b | 1352 | #if BITMAP_WORD_BITS > 32 |
d630245f | 1353 | x |= (x >> 32); |
12802c2b | 1354 | #endif |
d630245f | 1355 | bit_no += bitmap_popcount (x) - 1; |
12802c2b JH |
1356 | #endif |
1357 | ||
d630245f | 1358 | return bit_no; |
12802c2b | 1359 | } |
87e08c69 | 1360 | \f |
096ab9ea | 1361 | |
e28d0cfb | 1362 | /* DST = A & B. */ |
88c4f655 NS |
1363 | |
1364 | void | |
e326eeb5 | 1365 | bitmap_and (bitmap dst, const_bitmap a, const_bitmap b) |
096ab9ea | 1366 | { |
88c4f655 | 1367 | bitmap_element *dst_elt = dst->first; |
e326eeb5 KG |
1368 | const bitmap_element *a_elt = a->first; |
1369 | const bitmap_element *b_elt = b->first; | |
88c4f655 | 1370 | bitmap_element *dst_prev = NULL; |
8229306b | 1371 | |
d1e14d97 | 1372 | gcc_checking_assert (!dst->tree_form && !a->tree_form && !b->tree_form); |
08a3c5cd KZ |
1373 | gcc_assert (dst != a && dst != b); |
1374 | ||
1375 | if (a == b) | |
1376 | { | |
1377 | bitmap_copy (dst, a); | |
1378 | return; | |
1379 | } | |
1380 | ||
88c4f655 NS |
1381 | while (a_elt && b_elt) |
1382 | { | |
1383 | if (a_elt->indx < b_elt->indx) | |
1384 | a_elt = a_elt->next; | |
1385 | else if (b_elt->indx < a_elt->indx) | |
1386 | b_elt = b_elt->next; | |
1387 | else | |
1388 | { | |
1389 | /* Matching elts, generate A & B. */ | |
1390 | unsigned ix; | |
1391 | BITMAP_WORD ior = 0; | |
1392 | ||
1393 | if (!dst_elt) | |
d1e14d97 SB |
1394 | dst_elt = bitmap_list_insert_element_after (dst, dst_prev, |
1395 | a_elt->indx); | |
c22cacf3 | 1396 | else |
1bc40c7e | 1397 | dst_elt->indx = a_elt->indx; |
a2b709cc | 1398 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
88c4f655 NS |
1399 | { |
1400 | BITMAP_WORD r = a_elt->bits[ix] & b_elt->bits[ix]; | |
096ab9ea | 1401 | |
88c4f655 NS |
1402 | dst_elt->bits[ix] = r; |
1403 | ior |= r; | |
1404 | } | |
1405 | if (ior) | |
1406 | { | |
1407 | dst_prev = dst_elt; | |
1408 | dst_elt = dst_elt->next; | |
1409 | } | |
1410 | a_elt = a_elt->next; | |
1411 | b_elt = b_elt->next; | |
1412 | } | |
1413 | } | |
5ce02e40 SP |
1414 | /* Ensure that dst->current is valid. */ |
1415 | dst->current = dst->first; | |
88c4f655 | 1416 | bitmap_elt_clear_from (dst, dst_elt); |
7a40b8b1 | 1417 | gcc_checking_assert (!dst->current == !dst->first); |
88c4f655 NS |
1418 | if (dst->current) |
1419 | dst->indx = dst->current->indx; | |
1420 | } | |
1421 | ||
7b19209f | 1422 | /* A &= B. Return true if A changed. */ |
88c4f655 | 1423 | |
7b19209f | 1424 | bool |
e326eeb5 | 1425 | bitmap_and_into (bitmap a, const_bitmap b) |
88c4f655 NS |
1426 | { |
1427 | bitmap_element *a_elt = a->first; | |
e326eeb5 | 1428 | const bitmap_element *b_elt = b->first; |
88c4f655 | 1429 | bitmap_element *next; |
7b19209f | 1430 | bool changed = false; |
096ab9ea | 1431 | |
d1e14d97 SB |
1432 | gcc_checking_assert (!a->tree_form && !b->tree_form); |
1433 | ||
c22cacf3 | 1434 | if (a == b) |
7b19209f | 1435 | return false; |
08a3c5cd | 1436 | |
88c4f655 | 1437 | while (a_elt && b_elt) |
096ab9ea | 1438 | { |
88c4f655 NS |
1439 | if (a_elt->indx < b_elt->indx) |
1440 | { | |
1441 | next = a_elt->next; | |
d1e14d97 | 1442 | bitmap_list_unlink_element (a, a_elt); |
88c4f655 | 1443 | a_elt = next; |
7b19209f | 1444 | changed = true; |
88c4f655 NS |
1445 | } |
1446 | else if (b_elt->indx < a_elt->indx) | |
1447 | b_elt = b_elt->next; | |
1448 | else | |
096ab9ea | 1449 | { |
88c4f655 NS |
1450 | /* Matching elts, generate A &= B. */ |
1451 | unsigned ix; | |
1452 | BITMAP_WORD ior = 0; | |
1453 | ||
a2b709cc | 1454 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
88c4f655 NS |
1455 | { |
1456 | BITMAP_WORD r = a_elt->bits[ix] & b_elt->bits[ix]; | |
7b19209f SB |
1457 | if (a_elt->bits[ix] != r) |
1458 | changed = true; | |
88c4f655 NS |
1459 | a_elt->bits[ix] = r; |
1460 | ior |= r; | |
1461 | } | |
1462 | next = a_elt->next; | |
1463 | if (!ior) | |
d1e14d97 | 1464 | bitmap_list_unlink_element (a, a_elt); |
88c4f655 NS |
1465 | a_elt = next; |
1466 | b_elt = b_elt->next; | |
096ab9ea | 1467 | } |
88c4f655 | 1468 | } |
7b19209f SB |
1469 | |
1470 | if (a_elt) | |
1471 | { | |
1472 | changed = true; | |
1473 | bitmap_elt_clear_from (a, a_elt); | |
1474 | } | |
1475 | ||
7a40b8b1 JH |
1476 | gcc_checking_assert (!a->current == !a->first |
1477 | && (!a->current || a->indx == a->current->indx)); | |
7b19209f SB |
1478 | |
1479 | return changed; | |
88c4f655 NS |
1480 | } |
1481 | ||
6fb5fa3c DB |
1482 | |
1483 | /* Insert an element equal to SRC_ELT after DST_PREV, overwriting DST_ELT | |
1484 | if non-NULL. CHANGED is true if the destination bitmap had already been | |
1485 | changed; the new value of CHANGED is returned. */ | |
1486 | ||
1487 | static inline bool | |
1488 | bitmap_elt_copy (bitmap dst, bitmap_element *dst_elt, bitmap_element *dst_prev, | |
e326eeb5 | 1489 | const bitmap_element *src_elt, bool changed) |
6fb5fa3c DB |
1490 | { |
1491 | if (!changed && dst_elt && dst_elt->indx == src_elt->indx) | |
1492 | { | |
1493 | unsigned ix; | |
1494 | ||
a2b709cc | 1495 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
6fb5fa3c DB |
1496 | if (src_elt->bits[ix] != dst_elt->bits[ix]) |
1497 | { | |
1498 | dst_elt->bits[ix] = src_elt->bits[ix]; | |
1499 | changed = true; | |
1500 | } | |
1501 | } | |
1502 | else | |
1503 | { | |
1504 | changed = true; | |
1505 | if (!dst_elt) | |
d1e14d97 SB |
1506 | dst_elt = bitmap_list_insert_element_after (dst, dst_prev, |
1507 | src_elt->indx); | |
6fb5fa3c DB |
1508 | else |
1509 | dst_elt->indx = src_elt->indx; | |
1510 | memcpy (dst_elt->bits, src_elt->bits, sizeof (dst_elt->bits)); | |
1511 | } | |
1512 | return changed; | |
1513 | } | |
1514 | ||
1515 | ||
1516 | ||
88c4f655 NS |
1517 | /* DST = A & ~B */ |
1518 | ||
6fb5fa3c | 1519 | bool |
e326eeb5 | 1520 | bitmap_and_compl (bitmap dst, const_bitmap a, const_bitmap b) |
88c4f655 NS |
1521 | { |
1522 | bitmap_element *dst_elt = dst->first; | |
e326eeb5 KG |
1523 | const bitmap_element *a_elt = a->first; |
1524 | const bitmap_element *b_elt = b->first; | |
88c4f655 | 1525 | bitmap_element *dst_prev = NULL; |
6fb5fa3c DB |
1526 | bitmap_element **dst_prev_pnext = &dst->first; |
1527 | bool changed = false; | |
88c4f655 | 1528 | |
d1e14d97 | 1529 | gcc_checking_assert (!dst->tree_form && !a->tree_form && !b->tree_form); |
08a3c5cd | 1530 | gcc_assert (dst != a && dst != b); |
c22cacf3 | 1531 | |
08a3c5cd KZ |
1532 | if (a == b) |
1533 | { | |
6fb5fa3c | 1534 | changed = !bitmap_empty_p (dst); |
08a3c5cd | 1535 | bitmap_clear (dst); |
6fb5fa3c | 1536 | return changed; |
08a3c5cd KZ |
1537 | } |
1538 | ||
88c4f655 NS |
1539 | while (a_elt) |
1540 | { | |
6fb5fa3c DB |
1541 | while (b_elt && b_elt->indx < a_elt->indx) |
1542 | b_elt = b_elt->next; | |
1543 | ||
1544 | if (!b_elt || b_elt->indx > a_elt->indx) | |
096ab9ea | 1545 | { |
6fb5fa3c DB |
1546 | changed = bitmap_elt_copy (dst, dst_elt, dst_prev, a_elt, changed); |
1547 | dst_prev = *dst_prev_pnext; | |
1548 | dst_prev_pnext = &dst_prev->next; | |
1549 | dst_elt = *dst_prev_pnext; | |
88c4f655 | 1550 | a_elt = a_elt->next; |
096ab9ea | 1551 | } |
6fb5fa3c | 1552 | |
096ab9ea RK |
1553 | else |
1554 | { | |
88c4f655 NS |
1555 | /* Matching elts, generate A & ~B. */ |
1556 | unsigned ix; | |
1557 | BITMAP_WORD ior = 0; | |
1558 | ||
6fb5fa3c DB |
1559 | if (!changed && dst_elt && dst_elt->indx == a_elt->indx) |
1560 | { | |
a2b709cc | 1561 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
6fb5fa3c DB |
1562 | { |
1563 | BITMAP_WORD r = a_elt->bits[ix] & ~b_elt->bits[ix]; | |
1564 | ||
1565 | if (dst_elt->bits[ix] != r) | |
1566 | { | |
1567 | changed = true; | |
1568 | dst_elt->bits[ix] = r; | |
1569 | } | |
1570 | ior |= r; | |
1571 | } | |
1572 | } | |
c22cacf3 | 1573 | else |
88c4f655 | 1574 | { |
6fb5fa3c DB |
1575 | bool new_element; |
1576 | if (!dst_elt || dst_elt->indx > a_elt->indx) | |
1577 | { | |
d1e14d97 SB |
1578 | dst_elt = bitmap_list_insert_element_after (dst, dst_prev, |
1579 | a_elt->indx); | |
6fb5fa3c DB |
1580 | new_element = true; |
1581 | } | |
1582 | else | |
1583 | { | |
1584 | dst_elt->indx = a_elt->indx; | |
1585 | new_element = false; | |
1586 | } | |
88c4f655 | 1587 | |
a2b709cc | 1588 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
6fb5fa3c DB |
1589 | { |
1590 | BITMAP_WORD r = a_elt->bits[ix] & ~b_elt->bits[ix]; | |
1591 | ||
1592 | dst_elt->bits[ix] = r; | |
1593 | ior |= r; | |
1594 | } | |
1595 | ||
1596 | if (ior) | |
1597 | changed = true; | |
1598 | else | |
1599 | { | |
1600 | changed |= !new_element; | |
d1e14d97 | 1601 | bitmap_list_unlink_element (dst, dst_elt); |
6fb5fa3c DB |
1602 | dst_elt = *dst_prev_pnext; |
1603 | } | |
88c4f655 | 1604 | } |
6fb5fa3c | 1605 | |
88c4f655 NS |
1606 | if (ior) |
1607 | { | |
6fb5fa3c DB |
1608 | dst_prev = *dst_prev_pnext; |
1609 | dst_prev_pnext = &dst_prev->next; | |
1610 | dst_elt = *dst_prev_pnext; | |
88c4f655 NS |
1611 | } |
1612 | a_elt = a_elt->next; | |
1613 | b_elt = b_elt->next; | |
096ab9ea | 1614 | } |
88c4f655 | 1615 | } |
6fb5fa3c | 1616 | |
5ce02e40 SP |
1617 | /* Ensure that dst->current is valid. */ |
1618 | dst->current = dst->first; | |
6fb5fa3c DB |
1619 | |
1620 | if (dst_elt) | |
1621 | { | |
1622 | changed = true; | |
1623 | bitmap_elt_clear_from (dst, dst_elt); | |
1624 | } | |
7a40b8b1 | 1625 | gcc_checking_assert (!dst->current == !dst->first); |
88c4f655 NS |
1626 | if (dst->current) |
1627 | dst->indx = dst->current->indx; | |
6fb5fa3c DB |
1628 | |
1629 | return changed; | |
88c4f655 NS |
1630 | } |
1631 | ||
90bb1c1f | 1632 | /* A &= ~B. Returns true if A changes */ |
096ab9ea | 1633 | |
90bb1c1f | 1634 | bool |
e326eeb5 | 1635 | bitmap_and_compl_into (bitmap a, const_bitmap b) |
88c4f655 NS |
1636 | { |
1637 | bitmap_element *a_elt = a->first; | |
e326eeb5 | 1638 | const bitmap_element *b_elt = b->first; |
88c4f655 | 1639 | bitmap_element *next; |
90bb1c1f | 1640 | BITMAP_WORD changed = 0; |
88c4f655 | 1641 | |
d1e14d97 SB |
1642 | gcc_checking_assert (!a->tree_form && !b->tree_form); |
1643 | ||
08a3c5cd KZ |
1644 | if (a == b) |
1645 | { | |
1646 | if (bitmap_empty_p (a)) | |
1647 | return false; | |
1648 | else | |
1649 | { | |
1650 | bitmap_clear (a); | |
1651 | return true; | |
1652 | } | |
1653 | } | |
1654 | ||
88c4f655 NS |
1655 | while (a_elt && b_elt) |
1656 | { | |
1657 | if (a_elt->indx < b_elt->indx) | |
1658 | a_elt = a_elt->next; | |
1659 | else if (b_elt->indx < a_elt->indx) | |
1660 | b_elt = b_elt->next; | |
1661 | else | |
8229306b | 1662 | { |
88c4f655 NS |
1663 | /* Matching elts, generate A &= ~B. */ |
1664 | unsigned ix; | |
1665 | BITMAP_WORD ior = 0; | |
1666 | ||
a2b709cc | 1667 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
88c4f655 | 1668 | { |
90bb1c1f NS |
1669 | BITMAP_WORD cleared = a_elt->bits[ix] & b_elt->bits[ix]; |
1670 | BITMAP_WORD r = a_elt->bits[ix] ^ cleared; | |
88c4f655 NS |
1671 | |
1672 | a_elt->bits[ix] = r; | |
90bb1c1f | 1673 | changed |= cleared; |
88c4f655 NS |
1674 | ior |= r; |
1675 | } | |
1676 | next = a_elt->next; | |
1677 | if (!ior) | |
d1e14d97 | 1678 | bitmap_list_unlink_element (a, a_elt); |
88c4f655 NS |
1679 | a_elt = next; |
1680 | b_elt = b_elt->next; | |
8229306b | 1681 | } |
88c4f655 | 1682 | } |
7a40b8b1 JH |
1683 | gcc_checking_assert (!a->current == !a->first |
1684 | && (!a->current || a->indx == a->current->indx)); | |
90bb1c1f | 1685 | return changed != 0; |
88c4f655 NS |
1686 | } |
1687 | ||
6fb5fa3c DB |
1688 | /* Set COUNT bits from START in HEAD. */ |
1689 | void | |
1690 | bitmap_set_range (bitmap head, unsigned int start, unsigned int count) | |
1691 | { | |
1692 | unsigned int first_index, end_bit_plus1, last_index; | |
1693 | bitmap_element *elt, *elt_prev; | |
1694 | unsigned int i; | |
1695 | ||
d1e14d97 SB |
1696 | gcc_checking_assert (!head->tree_form); |
1697 | ||
6fb5fa3c DB |
1698 | if (!count) |
1699 | return; | |
1700 | ||
07a737f3 RS |
1701 | if (count == 1) |
1702 | { | |
1703 | bitmap_set_bit (head, start); | |
1704 | return; | |
1705 | } | |
1706 | ||
6fb5fa3c DB |
1707 | first_index = start / BITMAP_ELEMENT_ALL_BITS; |
1708 | end_bit_plus1 = start + count; | |
1709 | last_index = (end_bit_plus1 - 1) / BITMAP_ELEMENT_ALL_BITS; | |
d1e14d97 | 1710 | elt = bitmap_list_find_element (head, first_index); |
6fb5fa3c | 1711 | |
d1e14d97 | 1712 | /* If bitmap_list_find_element returns zero, the current is the closest block |
6fb5fa3c DB |
1713 | to the result. Otherwise, just use bitmap_element_allocate to |
1714 | ensure ELT is set; in the loop below, ELT == NULL means "insert | |
1715 | at the end of the bitmap". */ | |
1716 | if (!elt) | |
1717 | { | |
1718 | elt = bitmap_element_allocate (head); | |
1719 | elt->indx = first_index; | |
d1e14d97 | 1720 | bitmap_list_link_element (head, elt); |
6fb5fa3c DB |
1721 | } |
1722 | ||
377002a9 | 1723 | gcc_checking_assert (elt->indx == first_index); |
6fb5fa3c DB |
1724 | elt_prev = elt->prev; |
1725 | for (i = first_index; i <= last_index; i++) | |
1726 | { | |
1727 | unsigned elt_start_bit = i * BITMAP_ELEMENT_ALL_BITS; | |
1728 | unsigned elt_end_bit_plus1 = elt_start_bit + BITMAP_ELEMENT_ALL_BITS; | |
1729 | ||
1730 | unsigned int first_word_to_mod; | |
1731 | BITMAP_WORD first_mask; | |
1732 | unsigned int last_word_to_mod; | |
1733 | BITMAP_WORD last_mask; | |
1734 | unsigned int ix; | |
1735 | ||
1736 | if (!elt || elt->indx != i) | |
d1e14d97 | 1737 | elt = bitmap_list_insert_element_after (head, elt_prev, i); |
6fb5fa3c DB |
1738 | |
1739 | if (elt_start_bit <= start) | |
1740 | { | |
1741 | /* The first bit to turn on is somewhere inside this | |
1742 | elt. */ | |
1743 | first_word_to_mod = (start - elt_start_bit) / BITMAP_WORD_BITS; | |
1744 | ||
1745 | /* This mask should have 1s in all bits >= start position. */ | |
1746 | first_mask = | |
1747 | (((BITMAP_WORD) 1) << ((start % BITMAP_WORD_BITS))) - 1; | |
1748 | first_mask = ~first_mask; | |
1749 | } | |
1750 | else | |
1751 | { | |
1752 | /* The first bit to turn on is below this start of this elt. */ | |
1753 | first_word_to_mod = 0; | |
1754 | first_mask = ~(BITMAP_WORD) 0; | |
1755 | } | |
1756 | ||
1757 | if (elt_end_bit_plus1 <= end_bit_plus1) | |
1758 | { | |
1759 | /* The last bit to turn on is beyond this elt. */ | |
1760 | last_word_to_mod = BITMAP_ELEMENT_WORDS - 1; | |
1761 | last_mask = ~(BITMAP_WORD) 0; | |
1762 | } | |
1763 | else | |
1764 | { | |
1765 | /* The last bit to turn on is inside to this elt. */ | |
1766 | last_word_to_mod = | |
1767 | (end_bit_plus1 - elt_start_bit) / BITMAP_WORD_BITS; | |
1768 | ||
1769 | /* The last mask should have 1s below the end bit. */ | |
1770 | last_mask = | |
1771 | (((BITMAP_WORD) 1) << ((end_bit_plus1 % BITMAP_WORD_BITS))) - 1; | |
1772 | } | |
1773 | ||
1774 | if (first_word_to_mod == last_word_to_mod) | |
1775 | { | |
1776 | BITMAP_WORD mask = first_mask & last_mask; | |
1777 | elt->bits[first_word_to_mod] |= mask; | |
1778 | } | |
1779 | else | |
1780 | { | |
1781 | elt->bits[first_word_to_mod] |= first_mask; | |
1782 | if (BITMAP_ELEMENT_WORDS > 2) | |
1783 | for (ix = first_word_to_mod + 1; ix < last_word_to_mod; ix++) | |
1784 | elt->bits[ix] = ~(BITMAP_WORD) 0; | |
1785 | elt->bits[last_word_to_mod] |= last_mask; | |
1786 | } | |
1787 | ||
1788 | elt_prev = elt; | |
1789 | elt = elt->next; | |
1790 | } | |
1791 | ||
1792 | head->current = elt ? elt : elt_prev; | |
1793 | head->indx = head->current->indx; | |
1794 | } | |
1795 | ||
1bc40c7e KZ |
1796 | /* Clear COUNT bits from START in HEAD. */ |
1797 | void | |
1798 | bitmap_clear_range (bitmap head, unsigned int start, unsigned int count) | |
1799 | { | |
6fb5fa3c DB |
1800 | unsigned int first_index, end_bit_plus1, last_index; |
1801 | bitmap_element *elt; | |
1802 | ||
d1e14d97 SB |
1803 | gcc_checking_assert (!head->tree_form); |
1804 | ||
6fb5fa3c DB |
1805 | if (!count) |
1806 | return; | |
1807 | ||
07a737f3 RS |
1808 | if (count == 1) |
1809 | { | |
1810 | bitmap_clear_bit (head, start); | |
1811 | return; | |
1812 | } | |
1813 | ||
6fb5fa3c DB |
1814 | first_index = start / BITMAP_ELEMENT_ALL_BITS; |
1815 | end_bit_plus1 = start + count; | |
1816 | last_index = (end_bit_plus1 - 1) / BITMAP_ELEMENT_ALL_BITS; | |
d1e14d97 | 1817 | elt = bitmap_list_find_element (head, first_index); |
1bc40c7e | 1818 | |
d1e14d97 | 1819 | /* If bitmap_list_find_element returns zero, the current is the closest block |
1bc40c7e KZ |
1820 | to the result. If the current is less than first index, find the |
1821 | next one. Otherwise, just set elt to be current. */ | |
1822 | if (!elt) | |
c22cacf3 | 1823 | { |
1bc40c7e KZ |
1824 | if (head->current) |
1825 | { | |
1826 | if (head->indx < first_index) | |
1827 | { | |
1828 | elt = head->current->next; | |
1829 | if (!elt) | |
1830 | return; | |
1831 | } | |
c22cacf3 | 1832 | else |
1bc40c7e KZ |
1833 | elt = head->current; |
1834 | } | |
1835 | else | |
1836 | return; | |
1837 | } | |
1838 | ||
1839 | while (elt && (elt->indx <= last_index)) | |
1840 | { | |
1841 | bitmap_element * next_elt = elt->next; | |
1842 | unsigned elt_start_bit = (elt->indx) * BITMAP_ELEMENT_ALL_BITS; | |
1843 | unsigned elt_end_bit_plus1 = elt_start_bit + BITMAP_ELEMENT_ALL_BITS; | |
1844 | ||
1845 | ||
1846 | if (elt_start_bit >= start && elt_end_bit_plus1 <= end_bit_plus1) | |
1847 | /* Get rid of the entire elt and go to the next one. */ | |
d1e14d97 | 1848 | bitmap_list_unlink_element (head, elt); |
c22cacf3 | 1849 | else |
1bc40c7e KZ |
1850 | { |
1851 | /* Going to have to knock out some bits in this elt. */ | |
c22cacf3 MS |
1852 | unsigned int first_word_to_mod; |
1853 | BITMAP_WORD first_mask; | |
1bc40c7e KZ |
1854 | unsigned int last_word_to_mod; |
1855 | BITMAP_WORD last_mask; | |
1856 | unsigned int i; | |
1857 | bool clear = true; | |
1858 | ||
1859 | if (elt_start_bit <= start) | |
1860 | { | |
1861 | /* The first bit to turn off is somewhere inside this | |
1862 | elt. */ | |
1863 | first_word_to_mod = (start - elt_start_bit) / BITMAP_WORD_BITS; | |
1864 | ||
1865 | /* This mask should have 1s in all bits >= start position. */ | |
c22cacf3 | 1866 | first_mask = |
1bc40c7e KZ |
1867 | (((BITMAP_WORD) 1) << ((start % BITMAP_WORD_BITS))) - 1; |
1868 | first_mask = ~first_mask; | |
1869 | } | |
1870 | else | |
1871 | { | |
1872 | /* The first bit to turn off is below this start of this elt. */ | |
1873 | first_word_to_mod = 0; | |
1874 | first_mask = 0; | |
1875 | first_mask = ~first_mask; | |
c22cacf3 MS |
1876 | } |
1877 | ||
1bc40c7e KZ |
1878 | if (elt_end_bit_plus1 <= end_bit_plus1) |
1879 | { | |
1880 | /* The last bit to turn off is beyond this elt. */ | |
1881 | last_word_to_mod = BITMAP_ELEMENT_WORDS - 1; | |
1882 | last_mask = 0; | |
1883 | last_mask = ~last_mask; | |
1884 | } | |
1885 | else | |
1886 | { | |
1887 | /* The last bit to turn off is inside to this elt. */ | |
c22cacf3 | 1888 | last_word_to_mod = |
1bc40c7e KZ |
1889 | (end_bit_plus1 - elt_start_bit) / BITMAP_WORD_BITS; |
1890 | ||
1891 | /* The last mask should have 1s below the end bit. */ | |
c22cacf3 | 1892 | last_mask = |
1bc40c7e KZ |
1893 | (((BITMAP_WORD) 1) << (((end_bit_plus1) % BITMAP_WORD_BITS))) - 1; |
1894 | } | |
1895 | ||
1896 | ||
1897 | if (first_word_to_mod == last_word_to_mod) | |
1898 | { | |
1899 | BITMAP_WORD mask = first_mask & last_mask; | |
1900 | elt->bits[first_word_to_mod] &= ~mask; | |
1901 | } | |
1902 | else | |
1903 | { | |
1904 | elt->bits[first_word_to_mod] &= ~first_mask; | |
6fb5fa3c DB |
1905 | if (BITMAP_ELEMENT_WORDS > 2) |
1906 | for (i = first_word_to_mod + 1; i < last_word_to_mod; i++) | |
1907 | elt->bits[i] = 0; | |
1bc40c7e KZ |
1908 | elt->bits[last_word_to_mod] &= ~last_mask; |
1909 | } | |
1910 | for (i = 0; i < BITMAP_ELEMENT_WORDS; i++) | |
1911 | if (elt->bits[i]) | |
1912 | { | |
1913 | clear = false; | |
1914 | break; | |
1915 | } | |
1916 | /* Check to see if there are any bits left. */ | |
1917 | if (clear) | |
d1e14d97 | 1918 | bitmap_list_unlink_element (head, elt); |
1bc40c7e KZ |
1919 | } |
1920 | elt = next_elt; | |
1921 | } | |
c22cacf3 | 1922 | |
1bc40c7e KZ |
1923 | if (elt) |
1924 | { | |
1925 | head->current = elt; | |
1926 | head->indx = head->current->indx; | |
1927 | } | |
1928 | } | |
1929 | ||
1930 | /* A = ~A & B. */ | |
1931 | ||
1932 | void | |
e326eeb5 | 1933 | bitmap_compl_and_into (bitmap a, const_bitmap b) |
1bc40c7e KZ |
1934 | { |
1935 | bitmap_element *a_elt = a->first; | |
e326eeb5 | 1936 | const bitmap_element *b_elt = b->first; |
1bc40c7e KZ |
1937 | bitmap_element *a_prev = NULL; |
1938 | bitmap_element *next; | |
1939 | ||
d1e14d97 | 1940 | gcc_checking_assert (!a->tree_form && !b->tree_form); |
1bc40c7e KZ |
1941 | gcc_assert (a != b); |
1942 | ||
1943 | if (bitmap_empty_p (a)) | |
1944 | { | |
1945 | bitmap_copy (a, b); | |
1946 | return; | |
1947 | } | |
1948 | if (bitmap_empty_p (b)) | |
1949 | { | |
1950 | bitmap_clear (a); | |
1951 | return; | |
1952 | } | |
1953 | ||
1954 | while (a_elt || b_elt) | |
1955 | { | |
1956 | if (!b_elt || (a_elt && a_elt->indx < b_elt->indx)) | |
1957 | { | |
1958 | /* A is before B. Remove A */ | |
1959 | next = a_elt->next; | |
1960 | a_prev = a_elt->prev; | |
d1e14d97 | 1961 | bitmap_list_unlink_element (a, a_elt); |
1bc40c7e KZ |
1962 | a_elt = next; |
1963 | } | |
1964 | else if (!a_elt || b_elt->indx < a_elt->indx) | |
1965 | { | |
1966 | /* B is before A. Copy B. */ | |
d1e14d97 | 1967 | next = bitmap_list_insert_element_after (a, a_prev, b_elt->indx); |
1bc40c7e KZ |
1968 | memcpy (next->bits, b_elt->bits, sizeof (next->bits)); |
1969 | a_prev = next; | |
1970 | b_elt = b_elt->next; | |
1971 | } | |
1972 | else | |
1973 | { | |
1974 | /* Matching elts, generate A = ~A & B. */ | |
1975 | unsigned ix; | |
1976 | BITMAP_WORD ior = 0; | |
1977 | ||
a2b709cc | 1978 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
1bc40c7e KZ |
1979 | { |
1980 | BITMAP_WORD cleared = a_elt->bits[ix] & b_elt->bits[ix]; | |
1981 | BITMAP_WORD r = b_elt->bits[ix] ^ cleared; | |
1982 | ||
1983 | a_elt->bits[ix] = r; | |
1984 | ior |= r; | |
1985 | } | |
1986 | next = a_elt->next; | |
1987 | if (!ior) | |
d1e14d97 | 1988 | bitmap_list_unlink_element (a, a_elt); |
1bc40c7e KZ |
1989 | else |
1990 | a_prev = a_elt; | |
1991 | a_elt = next; | |
1992 | b_elt = b_elt->next; | |
1993 | } | |
1994 | } | |
7a40b8b1 JH |
1995 | gcc_checking_assert (!a->current == !a->first |
1996 | && (!a->current || a->indx == a->current->indx)); | |
1bc40c7e KZ |
1997 | return; |
1998 | } | |
1999 | ||
6fb5fa3c DB |
2000 | |
2001 | /* Insert an element corresponding to A_ELT | B_ELT after DST_PREV, | |
2002 | overwriting DST_ELT if non-NULL. CHANGED is true if the destination bitmap | |
2003 | had already been changed; the new value of CHANGED is returned. */ | |
2004 | ||
2005 | static inline bool | |
2006 | bitmap_elt_ior (bitmap dst, bitmap_element *dst_elt, bitmap_element *dst_prev, | |
e326eeb5 | 2007 | const bitmap_element *a_elt, const bitmap_element *b_elt, |
6fb5fa3c DB |
2008 | bool changed) |
2009 | { | |
2010 | gcc_assert (a_elt || b_elt); | |
2011 | ||
2012 | if (a_elt && b_elt && a_elt->indx == b_elt->indx) | |
2013 | { | |
2014 | /* Matching elts, generate A | B. */ | |
2015 | unsigned ix; | |
2016 | ||
2017 | if (!changed && dst_elt && dst_elt->indx == a_elt->indx) | |
2018 | { | |
a2b709cc | 2019 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
6fb5fa3c DB |
2020 | { |
2021 | BITMAP_WORD r = a_elt->bits[ix] | b_elt->bits[ix]; | |
2022 | if (r != dst_elt->bits[ix]) | |
2023 | { | |
2024 | dst_elt->bits[ix] = r; | |
2025 | changed = true; | |
2026 | } | |
2027 | } | |
2028 | } | |
2029 | else | |
2030 | { | |
2031 | changed = true; | |
2032 | if (!dst_elt) | |
d1e14d97 SB |
2033 | dst_elt = bitmap_list_insert_element_after (dst, dst_prev, |
2034 | a_elt->indx); | |
6fb5fa3c DB |
2035 | else |
2036 | dst_elt->indx = a_elt->indx; | |
a2b709cc | 2037 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
6fb5fa3c DB |
2038 | { |
2039 | BITMAP_WORD r = a_elt->bits[ix] | b_elt->bits[ix]; | |
2040 | dst_elt->bits[ix] = r; | |
2041 | } | |
2042 | } | |
2043 | } | |
2044 | else | |
2045 | { | |
2046 | /* Copy a single element. */ | |
e326eeb5 | 2047 | const bitmap_element *src; |
6fb5fa3c DB |
2048 | |
2049 | if (!b_elt || (a_elt && a_elt->indx < b_elt->indx)) | |
2050 | src = a_elt; | |
2051 | else | |
2052 | src = b_elt; | |
2053 | ||
377002a9 | 2054 | gcc_checking_assert (src); |
6fb5fa3c DB |
2055 | changed = bitmap_elt_copy (dst, dst_elt, dst_prev, src, changed); |
2056 | } | |
2057 | return changed; | |
2058 | } | |
2059 | ||
2060 | ||
88c4f655 NS |
2061 | /* DST = A | B. Return true if DST changes. */ |
2062 | ||
2063 | bool | |
e326eeb5 | 2064 | bitmap_ior (bitmap dst, const_bitmap a, const_bitmap b) |
88c4f655 NS |
2065 | { |
2066 | bitmap_element *dst_elt = dst->first; | |
e326eeb5 KG |
2067 | const bitmap_element *a_elt = a->first; |
2068 | const bitmap_element *b_elt = b->first; | |
88c4f655 | 2069 | bitmap_element *dst_prev = NULL; |
6fb5fa3c | 2070 | bitmap_element **dst_prev_pnext = &dst->first; |
c22cacf3 | 2071 | bool changed = false; |
88c4f655 | 2072 | |
d1e14d97 | 2073 | gcc_checking_assert (!dst->tree_form && !a->tree_form && !b->tree_form); |
08a3c5cd KZ |
2074 | gcc_assert (dst != a && dst != b); |
2075 | ||
88c4f655 NS |
2076 | while (a_elt || b_elt) |
2077 | { | |
6fb5fa3c DB |
2078 | changed = bitmap_elt_ior (dst, dst_elt, dst_prev, a_elt, b_elt, changed); |
2079 | ||
88c4f655 | 2080 | if (a_elt && b_elt && a_elt->indx == b_elt->indx) |
8229306b | 2081 | { |
88c4f655 NS |
2082 | a_elt = a_elt->next; |
2083 | b_elt = b_elt->next; | |
8229306b RH |
2084 | } |
2085 | else | |
096ab9ea | 2086 | { |
6fb5fa3c DB |
2087 | if (a_elt && (!b_elt || a_elt->indx <= b_elt->indx)) |
2088 | a_elt = a_elt->next; | |
2089 | else if (b_elt && (!a_elt || b_elt->indx <= a_elt->indx)) | |
2090 | b_elt = b_elt->next; | |
096ab9ea | 2091 | } |
6fb5fa3c DB |
2092 | |
2093 | dst_prev = *dst_prev_pnext; | |
2094 | dst_prev_pnext = &dst_prev->next; | |
2095 | dst_elt = *dst_prev_pnext; | |
88c4f655 NS |
2096 | } |
2097 | ||
2098 | if (dst_elt) | |
2099 | { | |
2100 | changed = true; | |
9e5d3a2c MS |
2101 | /* Ensure that dst->current is valid. */ |
2102 | dst->current = dst->first; | |
88c4f655 NS |
2103 | bitmap_elt_clear_from (dst, dst_elt); |
2104 | } | |
7a40b8b1 | 2105 | gcc_checking_assert (!dst->current == !dst->first); |
88c4f655 NS |
2106 | if (dst->current) |
2107 | dst->indx = dst->current->indx; | |
2108 | return changed; | |
2109 | } | |
096ab9ea | 2110 | |
88c4f655 NS |
2111 | /* A |= B. Return true if A changes. */ |
2112 | ||
2113 | bool | |
e326eeb5 | 2114 | bitmap_ior_into (bitmap a, const_bitmap b) |
88c4f655 NS |
2115 | { |
2116 | bitmap_element *a_elt = a->first; | |
e326eeb5 | 2117 | const bitmap_element *b_elt = b->first; |
88c4f655 | 2118 | bitmap_element *a_prev = NULL; |
6fb5fa3c | 2119 | bitmap_element **a_prev_pnext = &a->first; |
88c4f655 NS |
2120 | bool changed = false; |
2121 | ||
d1e14d97 | 2122 | gcc_checking_assert (!a->tree_form && !b->tree_form); |
08a3c5cd KZ |
2123 | if (a == b) |
2124 | return false; | |
2125 | ||
88c4f655 NS |
2126 | while (b_elt) |
2127 | { | |
6fb5fa3c DB |
2128 | /* If A lags behind B, just advance it. */ |
2129 | if (!a_elt || a_elt->indx == b_elt->indx) | |
88c4f655 | 2130 | { |
6fb5fa3c | 2131 | changed = bitmap_elt_ior (a, a_elt, a_prev, a_elt, b_elt, changed); |
88c4f655 | 2132 | b_elt = b_elt->next; |
b9a73e32 | 2133 | } |
6fb5fa3c | 2134 | else if (a_elt->indx > b_elt->indx) |
b9a73e32 | 2135 | { |
6fb5fa3c | 2136 | changed = bitmap_elt_copy (a, NULL, a_prev, b_elt, changed); |
88c4f655 | 2137 | b_elt = b_elt->next; |
096ab9ea | 2138 | } |
6fb5fa3c DB |
2139 | |
2140 | a_prev = *a_prev_pnext; | |
2141 | a_prev_pnext = &a_prev->next; | |
2142 | a_elt = *a_prev_pnext; | |
096ab9ea | 2143 | } |
6fb5fa3c | 2144 | |
7a40b8b1 | 2145 | gcc_checking_assert (!a->current == !a->first); |
88c4f655 NS |
2146 | if (a->current) |
2147 | a->indx = a->current->indx; | |
2148 | return changed; | |
2149 | } | |
2150 | ||
029ca388 RB |
2151 | /* A |= B. Return true if A changes. Free B (re-using its storage |
2152 | for the result). */ | |
2153 | ||
2154 | bool | |
2155 | bitmap_ior_into_and_free (bitmap a, bitmap *b_) | |
2156 | { | |
2157 | bitmap b = *b_; | |
2158 | bitmap_element *a_elt = a->first; | |
2159 | bitmap_element *b_elt = b->first; | |
2160 | bitmap_element *a_prev = NULL; | |
2161 | bitmap_element **a_prev_pnext = &a->first; | |
2162 | bool changed = false; | |
2163 | ||
2164 | gcc_checking_assert (!a->tree_form && !b->tree_form); | |
2165 | gcc_assert (a->obstack == b->obstack); | |
2166 | if (a == b) | |
2167 | return false; | |
2168 | ||
2169 | while (b_elt) | |
2170 | { | |
2171 | /* If A lags behind B, just advance it. */ | |
2172 | if (!a_elt || a_elt->indx == b_elt->indx) | |
2173 | { | |
2174 | changed = bitmap_elt_ior (a, a_elt, a_prev, a_elt, b_elt, changed); | |
2175 | b_elt = b_elt->next; | |
2176 | } | |
2177 | else if (a_elt->indx > b_elt->indx) | |
2178 | { | |
2179 | bitmap_element *b_elt_next = b_elt->next; | |
2180 | bitmap_list_unlink_element (b, b_elt, false); | |
2181 | bitmap_list_insert_element_after (a, a_prev, b_elt->indx, b_elt); | |
2182 | b_elt = b_elt_next; | |
2183 | } | |
2184 | ||
2185 | a_prev = *a_prev_pnext; | |
2186 | a_prev_pnext = &a_prev->next; | |
2187 | a_elt = *a_prev_pnext; | |
2188 | } | |
2189 | ||
2190 | gcc_checking_assert (!a->current == !a->first); | |
2191 | if (a->current) | |
2192 | a->indx = a->current->indx; | |
2193 | ||
2194 | if (b->obstack) | |
2195 | BITMAP_FREE (*b_); | |
2196 | else | |
2197 | bitmap_clear (b); | |
2198 | return changed; | |
2199 | } | |
2200 | ||
88c4f655 | 2201 | /* DST = A ^ B */ |
096ab9ea | 2202 | |
88c4f655 | 2203 | void |
e326eeb5 | 2204 | bitmap_xor (bitmap dst, const_bitmap a, const_bitmap b) |
88c4f655 NS |
2205 | { |
2206 | bitmap_element *dst_elt = dst->first; | |
e326eeb5 KG |
2207 | const bitmap_element *a_elt = a->first; |
2208 | const bitmap_element *b_elt = b->first; | |
88c4f655 NS |
2209 | bitmap_element *dst_prev = NULL; |
2210 | ||
d1e14d97 | 2211 | gcc_checking_assert (!dst->tree_form && !a->tree_form && !b->tree_form); |
08a3c5cd | 2212 | gcc_assert (dst != a && dst != b); |
d1e14d97 | 2213 | |
08a3c5cd KZ |
2214 | if (a == b) |
2215 | { | |
2216 | bitmap_clear (dst); | |
2217 | return; | |
2218 | } | |
2219 | ||
88c4f655 | 2220 | while (a_elt || b_elt) |
096ab9ea | 2221 | { |
88c4f655 | 2222 | if (a_elt && b_elt && a_elt->indx == b_elt->indx) |
e2500fed | 2223 | { |
88c4f655 NS |
2224 | /* Matching elts, generate A ^ B. */ |
2225 | unsigned ix; | |
2226 | BITMAP_WORD ior = 0; | |
2227 | ||
2228 | if (!dst_elt) | |
d1e14d97 SB |
2229 | dst_elt = bitmap_list_insert_element_after (dst, dst_prev, |
2230 | a_elt->indx); | |
1bc40c7e KZ |
2231 | else |
2232 | dst_elt->indx = a_elt->indx; | |
a2b709cc | 2233 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
88c4f655 NS |
2234 | { |
2235 | BITMAP_WORD r = a_elt->bits[ix] ^ b_elt->bits[ix]; | |
2236 | ||
2237 | ior |= r; | |
2238 | dst_elt->bits[ix] = r; | |
2239 | } | |
2240 | a_elt = a_elt->next; | |
2241 | b_elt = b_elt->next; | |
2242 | if (ior) | |
2243 | { | |
2244 | dst_prev = dst_elt; | |
2245 | dst_elt = dst_elt->next; | |
2246 | } | |
e2500fed GK |
2247 | } |
2248 | else | |
2249 | { | |
88c4f655 | 2250 | /* Copy a single element. */ |
e326eeb5 | 2251 | const bitmap_element *src; |
88c4f655 NS |
2252 | |
2253 | if (!b_elt || (a_elt && a_elt->indx < b_elt->indx)) | |
2254 | { | |
2255 | src = a_elt; | |
2256 | a_elt = a_elt->next; | |
2257 | } | |
2258 | else | |
2259 | { | |
2260 | src = b_elt; | |
2261 | b_elt = b_elt->next; | |
2262 | } | |
2263 | ||
2264 | if (!dst_elt) | |
d1e14d97 SB |
2265 | dst_elt = bitmap_list_insert_element_after (dst, dst_prev, |
2266 | src->indx); | |
c22cacf3 | 2267 | else |
1bc40c7e | 2268 | dst_elt->indx = src->indx; |
88c4f655 NS |
2269 | memcpy (dst_elt->bits, src->bits, sizeof (dst_elt->bits)); |
2270 | dst_prev = dst_elt; | |
2271 | dst_elt = dst_elt->next; | |
e2500fed | 2272 | } |
096ab9ea | 2273 | } |
5ce02e40 SP |
2274 | /* Ensure that dst->current is valid. */ |
2275 | dst->current = dst->first; | |
88c4f655 | 2276 | bitmap_elt_clear_from (dst, dst_elt); |
7a40b8b1 | 2277 | gcc_checking_assert (!dst->current == !dst->first); |
88c4f655 NS |
2278 | if (dst->current) |
2279 | dst->indx = dst->current->indx; | |
2280 | } | |
096ab9ea | 2281 | |
88c4f655 | 2282 | /* A ^= B */ |
8229306b | 2283 | |
88c4f655 | 2284 | void |
e326eeb5 | 2285 | bitmap_xor_into (bitmap a, const_bitmap b) |
88c4f655 NS |
2286 | { |
2287 | bitmap_element *a_elt = a->first; | |
e326eeb5 | 2288 | const bitmap_element *b_elt = b->first; |
88c4f655 NS |
2289 | bitmap_element *a_prev = NULL; |
2290 | ||
d1e14d97 SB |
2291 | gcc_checking_assert (!a->tree_form && !b->tree_form); |
2292 | ||
08a3c5cd KZ |
2293 | if (a == b) |
2294 | { | |
2295 | bitmap_clear (a); | |
2296 | return; | |
2297 | } | |
2298 | ||
88c4f655 NS |
2299 | while (b_elt) |
2300 | { | |
2301 | if (!a_elt || b_elt->indx < a_elt->indx) | |
2302 | { | |
2303 | /* Copy b_elt. */ | |
d1e14d97 SB |
2304 | bitmap_element *dst = bitmap_list_insert_element_after (a, a_prev, |
2305 | b_elt->indx); | |
88c4f655 NS |
2306 | memcpy (dst->bits, b_elt->bits, sizeof (dst->bits)); |
2307 | a_prev = dst; | |
2308 | b_elt = b_elt->next; | |
2309 | } | |
2310 | else if (a_elt->indx < b_elt->indx) | |
2311 | { | |
2312 | a_prev = a_elt; | |
2313 | a_elt = a_elt->next; | |
2314 | } | |
2315 | else | |
2316 | { | |
2317 | /* Matching elts, generate A ^= B. */ | |
2318 | unsigned ix; | |
2319 | BITMAP_WORD ior = 0; | |
2320 | bitmap_element *next = a_elt->next; | |
2321 | ||
a2b709cc | 2322 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
88c4f655 NS |
2323 | { |
2324 | BITMAP_WORD r = a_elt->bits[ix] ^ b_elt->bits[ix]; | |
2325 | ||
2326 | ior |= r; | |
2327 | a_elt->bits[ix] = r; | |
2328 | } | |
2329 | b_elt = b_elt->next; | |
2330 | if (ior) | |
2331 | a_prev = a_elt; | |
2332 | else | |
d1e14d97 | 2333 | bitmap_list_unlink_element (a, a_elt); |
88c4f655 NS |
2334 | a_elt = next; |
2335 | } | |
2336 | } | |
7a40b8b1 | 2337 | gcc_checking_assert (!a->current == !a->first); |
88c4f655 NS |
2338 | if (a->current) |
2339 | a->indx = a->current->indx; | |
8229306b RH |
2340 | } |
2341 | ||
55994078 NS |
2342 | /* Return true if two bitmaps are identical. |
2343 | We do not bother with a check for pointer equality, as that never | |
2344 | occurs in practice. */ | |
8229306b | 2345 | |
55994078 | 2346 | bool |
e326eeb5 | 2347 | bitmap_equal_p (const_bitmap a, const_bitmap b) |
8229306b | 2348 | { |
e326eeb5 KG |
2349 | const bitmap_element *a_elt; |
2350 | const bitmap_element *b_elt; | |
55994078 | 2351 | unsigned ix; |
c22cacf3 | 2352 | |
d1e14d97 SB |
2353 | gcc_checking_assert (!a->tree_form && !b->tree_form); |
2354 | ||
55994078 NS |
2355 | for (a_elt = a->first, b_elt = b->first; |
2356 | a_elt && b_elt; | |
2357 | a_elt = a_elt->next, b_elt = b_elt->next) | |
2358 | { | |
2359 | if (a_elt->indx != b_elt->indx) | |
2360 | return false; | |
a2b709cc | 2361 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
55994078 NS |
2362 | if (a_elt->bits[ix] != b_elt->bits[ix]) |
2363 | return false; | |
2364 | } | |
2365 | return !a_elt && !b_elt; | |
2366 | } | |
2367 | ||
2368 | /* Return true if A AND B is not empty. */ | |
2369 | ||
2370 | bool | |
e326eeb5 | 2371 | bitmap_intersect_p (const_bitmap a, const_bitmap b) |
55994078 | 2372 | { |
e326eeb5 KG |
2373 | const bitmap_element *a_elt; |
2374 | const bitmap_element *b_elt; | |
55994078 | 2375 | unsigned ix; |
c22cacf3 | 2376 | |
d1e14d97 SB |
2377 | gcc_checking_assert (!a->tree_form && !b->tree_form); |
2378 | ||
55994078 NS |
2379 | for (a_elt = a->first, b_elt = b->first; |
2380 | a_elt && b_elt;) | |
2381 | { | |
2382 | if (a_elt->indx < b_elt->indx) | |
2383 | a_elt = a_elt->next; | |
2384 | else if (b_elt->indx < a_elt->indx) | |
2385 | b_elt = b_elt->next; | |
2386 | else | |
2387 | { | |
a2b709cc | 2388 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
55994078 NS |
2389 | if (a_elt->bits[ix] & b_elt->bits[ix]) |
2390 | return true; | |
2391 | a_elt = a_elt->next; | |
2392 | b_elt = b_elt->next; | |
2393 | } | |
2394 | } | |
2395 | return false; | |
2396 | } | |
8229306b | 2397 | |
55994078 | 2398 | /* Return true if A AND NOT B is not empty. */ |
8229306b | 2399 | |
55994078 | 2400 | bool |
e326eeb5 | 2401 | bitmap_intersect_compl_p (const_bitmap a, const_bitmap b) |
55994078 | 2402 | { |
e326eeb5 KG |
2403 | const bitmap_element *a_elt; |
2404 | const bitmap_element *b_elt; | |
55994078 | 2405 | unsigned ix; |
d1e14d97 SB |
2406 | |
2407 | gcc_checking_assert (!a->tree_form && !b->tree_form); | |
2408 | ||
55994078 NS |
2409 | for (a_elt = a->first, b_elt = b->first; |
2410 | a_elt && b_elt;) | |
2411 | { | |
2412 | if (a_elt->indx < b_elt->indx) | |
2413 | return true; | |
2414 | else if (b_elt->indx < a_elt->indx) | |
2415 | b_elt = b_elt->next; | |
2416 | else | |
2417 | { | |
a2b709cc | 2418 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
55994078 NS |
2419 | if (a_elt->bits[ix] & ~b_elt->bits[ix]) |
2420 | return true; | |
2421 | a_elt = a_elt->next; | |
2422 | b_elt = b_elt->next; | |
2423 | } | |
2424 | } | |
2425 | return a_elt != NULL; | |
096ab9ea | 2426 | } |
55994078 | 2427 | |
096ab9ea | 2428 | \f |
88c4f655 | 2429 | /* DST = A | (FROM1 & ~FROM2). Return true if DST changes. */ |
096ab9ea | 2430 | |
7ef7b345 | 2431 | bool |
e326eeb5 | 2432 | bitmap_ior_and_compl (bitmap dst, const_bitmap a, const_bitmap b, const_bitmap kill) |
096ab9ea | 2433 | { |
6fb5fa3c | 2434 | bool changed = false; |
7932a3db | 2435 | |
6fb5fa3c | 2436 | bitmap_element *dst_elt = dst->first; |
e326eeb5 KG |
2437 | const bitmap_element *a_elt = a->first; |
2438 | const bitmap_element *b_elt = b->first; | |
2439 | const bitmap_element *kill_elt = kill->first; | |
6fb5fa3c DB |
2440 | bitmap_element *dst_prev = NULL; |
2441 | bitmap_element **dst_prev_pnext = &dst->first; | |
2442 | ||
d1e14d97 SB |
2443 | gcc_checking_assert (!dst->tree_form && !a->tree_form && !b->tree_form |
2444 | && !kill->tree_form); | |
6fb5fa3c DB |
2445 | gcc_assert (dst != a && dst != b && dst != kill); |
2446 | ||
2447 | /* Special cases. We don't bother checking for bitmap_equal_p (b, kill). */ | |
2448 | if (b == kill || bitmap_empty_p (b)) | |
2449 | { | |
2450 | changed = !bitmap_equal_p (dst, a); | |
2451 | if (changed) | |
2452 | bitmap_copy (dst, a); | |
2453 | return changed; | |
2454 | } | |
2455 | if (bitmap_empty_p (kill)) | |
2456 | return bitmap_ior (dst, a, b); | |
2457 | if (bitmap_empty_p (a)) | |
2458 | return bitmap_and_compl (dst, b, kill); | |
2459 | ||
2460 | while (a_elt || b_elt) | |
2461 | { | |
2462 | bool new_element = false; | |
2463 | ||
2464 | if (b_elt) | |
2465 | while (kill_elt && kill_elt->indx < b_elt->indx) | |
2466 | kill_elt = kill_elt->next; | |
2467 | ||
2468 | if (b_elt && kill_elt && kill_elt->indx == b_elt->indx | |
2469 | && (!a_elt || a_elt->indx >= b_elt->indx)) | |
2470 | { | |
2471 | bitmap_element tmp_elt; | |
2472 | unsigned ix; | |
2473 | ||
2474 | BITMAP_WORD ior = 0; | |
2475 | tmp_elt.indx = b_elt->indx; | |
a2b709cc | 2476 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
6fb5fa3c DB |
2477 | { |
2478 | BITMAP_WORD r = b_elt->bits[ix] & ~kill_elt->bits[ix]; | |
2479 | ior |= r; | |
2480 | tmp_elt.bits[ix] = r; | |
2481 | } | |
2482 | ||
2483 | if (ior) | |
2484 | { | |
2485 | changed = bitmap_elt_ior (dst, dst_elt, dst_prev, | |
2486 | a_elt, &tmp_elt, changed); | |
2487 | new_element = true; | |
2488 | if (a_elt && a_elt->indx == b_elt->indx) | |
2489 | a_elt = a_elt->next; | |
2490 | } | |
2491 | ||
2492 | b_elt = b_elt->next; | |
2493 | kill_elt = kill_elt->next; | |
2494 | } | |
2495 | else | |
2496 | { | |
2497 | changed = bitmap_elt_ior (dst, dst_elt, dst_prev, | |
2498 | a_elt, b_elt, changed); | |
2499 | new_element = true; | |
2500 | ||
2501 | if (a_elt && b_elt && a_elt->indx == b_elt->indx) | |
2502 | { | |
2503 | a_elt = a_elt->next; | |
2504 | b_elt = b_elt->next; | |
2505 | } | |
2506 | else | |
2507 | { | |
2508 | if (a_elt && (!b_elt || a_elt->indx <= b_elt->indx)) | |
2509 | a_elt = a_elt->next; | |
2510 | else if (b_elt && (!a_elt || b_elt->indx <= a_elt->indx)) | |
2511 | b_elt = b_elt->next; | |
2512 | } | |
2513 | } | |
2514 | ||
2515 | if (new_element) | |
2516 | { | |
2517 | dst_prev = *dst_prev_pnext; | |
2518 | dst_prev_pnext = &dst_prev->next; | |
2519 | dst_elt = *dst_prev_pnext; | |
2520 | } | |
2521 | } | |
2522 | ||
2523 | if (dst_elt) | |
2524 | { | |
2525 | changed = true; | |
9e5d3a2c MS |
2526 | /* Ensure that dst->current is valid. */ |
2527 | dst->current = dst->first; | |
6fb5fa3c DB |
2528 | bitmap_elt_clear_from (dst, dst_elt); |
2529 | } | |
7a40b8b1 | 2530 | gcc_checking_assert (!dst->current == !dst->first); |
6fb5fa3c DB |
2531 | if (dst->current) |
2532 | dst->indx = dst->current->indx; | |
88c4f655 | 2533 | |
eb59b8de | 2534 | return changed; |
096ab9ea | 2535 | } |
87e08c69 | 2536 | |
d1e14d97 | 2537 | /* A |= (B & ~C). Return true if A changes. */ |
7ef7b345 NS |
2538 | |
2539 | bool | |
d1e14d97 | 2540 | bitmap_ior_and_compl_into (bitmap a, const_bitmap b, const_bitmap c) |
87e08c69 | 2541 | { |
0e5b369e RB |
2542 | bitmap_element *a_elt = a->first; |
2543 | const bitmap_element *b_elt = b->first; | |
2544 | const bitmap_element *c_elt = c->first; | |
2545 | bitmap_element and_elt; | |
2546 | bitmap_element *a_prev = NULL; | |
2547 | bitmap_element **a_prev_pnext = &a->first; | |
2548 | bool changed = false; | |
2549 | unsigned ix; | |
c22cacf3 | 2550 | |
d1e14d97 SB |
2551 | gcc_checking_assert (!a->tree_form && !b->tree_form && !c->tree_form); |
2552 | ||
0e5b369e RB |
2553 | if (a == b) |
2554 | return false; | |
2555 | if (bitmap_empty_p (c)) | |
2556 | return bitmap_ior_into (a, b); | |
2557 | else if (bitmap_empty_p (a)) | |
2558 | return bitmap_and_compl (a, b, c); | |
87e08c69 | 2559 | |
0e5b369e RB |
2560 | and_elt.indx = -1; |
2561 | while (b_elt) | |
2562 | { | |
2563 | /* Advance C. */ | |
2564 | while (c_elt && c_elt->indx < b_elt->indx) | |
2565 | c_elt = c_elt->next; | |
2566 | ||
2567 | const bitmap_element *and_elt_ptr; | |
2568 | if (c_elt && c_elt->indx == b_elt->indx) | |
2569 | { | |
2570 | BITMAP_WORD overall = 0; | |
2571 | and_elt_ptr = &and_elt; | |
2572 | and_elt.indx = b_elt->indx; | |
2573 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) | |
2574 | { | |
2575 | and_elt.bits[ix] = b_elt->bits[ix] & ~c_elt->bits[ix]; | |
2576 | overall |= and_elt.bits[ix]; | |
2577 | } | |
2578 | if (!overall) | |
2579 | { | |
2580 | b_elt = b_elt->next; | |
2581 | continue; | |
2582 | } | |
2583 | } | |
2584 | else | |
2585 | and_elt_ptr = b_elt; | |
2586 | ||
2587 | b_elt = b_elt->next; | |
2588 | ||
2589 | /* Now find a place to insert AND_ELT. */ | |
2590 | do | |
2591 | { | |
2592 | ix = a_elt ? a_elt->indx : and_elt_ptr->indx; | |
2593 | if (ix == and_elt_ptr->indx) | |
2594 | changed = bitmap_elt_ior (a, a_elt, a_prev, a_elt, | |
2595 | and_elt_ptr, changed); | |
2596 | else if (ix > and_elt_ptr->indx) | |
2597 | changed = bitmap_elt_copy (a, NULL, a_prev, and_elt_ptr, changed); | |
2598 | ||
2599 | a_prev = *a_prev_pnext; | |
2600 | a_prev_pnext = &a_prev->next; | |
2601 | a_elt = *a_prev_pnext; | |
2602 | ||
2603 | /* If A lagged behind B/C, we advanced it so loop once more. */ | |
2604 | } | |
2605 | while (ix < and_elt_ptr->indx); | |
2606 | } | |
2607 | ||
2608 | gcc_checking_assert (!a->current == !a->first); | |
2609 | if (a->current) | |
2610 | a->indx = a->current->indx; | |
87e08c69 RH |
2611 | return changed; |
2612 | } | |
6fb5fa3c | 2613 | |
7ff23740 PB |
2614 | /* A |= (B & C). Return true if A changes. */ |
2615 | ||
2616 | bool | |
2617 | bitmap_ior_and_into (bitmap a, const_bitmap b, const_bitmap c) | |
2618 | { | |
2619 | bitmap_element *a_elt = a->first; | |
2620 | const bitmap_element *b_elt = b->first; | |
2621 | const bitmap_element *c_elt = c->first; | |
2622 | bitmap_element and_elt; | |
2623 | bitmap_element *a_prev = NULL; | |
2624 | bitmap_element **a_prev_pnext = &a->first; | |
2625 | bool changed = false; | |
2626 | unsigned ix; | |
2627 | ||
d1e14d97 SB |
2628 | gcc_checking_assert (!a->tree_form && !b->tree_form && !c->tree_form); |
2629 | ||
7ff23740 PB |
2630 | if (b == c) |
2631 | return bitmap_ior_into (a, b); | |
2632 | if (bitmap_empty_p (b) || bitmap_empty_p (c)) | |
2633 | return false; | |
2634 | ||
2635 | and_elt.indx = -1; | |
2636 | while (b_elt && c_elt) | |
2637 | { | |
2638 | BITMAP_WORD overall; | |
2639 | ||
2640 | /* Find a common item of B and C. */ | |
2641 | while (b_elt->indx != c_elt->indx) | |
2642 | { | |
2643 | if (b_elt->indx < c_elt->indx) | |
2644 | { | |
2645 | b_elt = b_elt->next; | |
2646 | if (!b_elt) | |
2647 | goto done; | |
2648 | } | |
2649 | else | |
2650 | { | |
2651 | c_elt = c_elt->next; | |
2652 | if (!c_elt) | |
2653 | goto done; | |
2654 | } | |
2655 | } | |
2656 | ||
2657 | overall = 0; | |
2658 | and_elt.indx = b_elt->indx; | |
a2b709cc | 2659 | for (ix = 0; ix < BITMAP_ELEMENT_WORDS; ix++) |
7ff23740 PB |
2660 | { |
2661 | and_elt.bits[ix] = b_elt->bits[ix] & c_elt->bits[ix]; | |
2662 | overall |= and_elt.bits[ix]; | |
2663 | } | |
2664 | ||
2665 | b_elt = b_elt->next; | |
2666 | c_elt = c_elt->next; | |
2667 | if (!overall) | |
2668 | continue; | |
2669 | ||
2670 | /* Now find a place to insert AND_ELT. */ | |
2671 | do | |
2672 | { | |
2673 | ix = a_elt ? a_elt->indx : and_elt.indx; | |
2674 | if (ix == and_elt.indx) | |
2675 | changed = bitmap_elt_ior (a, a_elt, a_prev, a_elt, &and_elt, changed); | |
2676 | else if (ix > and_elt.indx) | |
2677 | changed = bitmap_elt_copy (a, NULL, a_prev, &and_elt, changed); | |
2678 | ||
2679 | a_prev = *a_prev_pnext; | |
2680 | a_prev_pnext = &a_prev->next; | |
2681 | a_elt = *a_prev_pnext; | |
2682 | ||
2683 | /* If A lagged behind B/C, we advanced it so loop once more. */ | |
2684 | } | |
2685 | while (ix < and_elt.indx); | |
2686 | } | |
2687 | ||
2688 | done: | |
7a40b8b1 | 2689 | gcc_checking_assert (!a->current == !a->first); |
7ff23740 PB |
2690 | if (a->current) |
2691 | a->indx = a->current->indx; | |
2692 | return changed; | |
2693 | } | |
7aa6d18a SB |
2694 | |
2695 | /* Compute hash of bitmap (for purposes of hashing). */ | |
d1e14d97 | 2696 | |
7aa6d18a SB |
2697 | hashval_t |
2698 | bitmap_hash (const_bitmap head) | |
2699 | { | |
2700 | const bitmap_element *ptr; | |
2701 | BITMAP_WORD hash = 0; | |
2702 | int ix; | |
2703 | ||
d1e14d97 SB |
2704 | gcc_checking_assert (!head->tree_form); |
2705 | ||
7aa6d18a SB |
2706 | for (ptr = head->first; ptr; ptr = ptr->next) |
2707 | { | |
2708 | hash ^= ptr->indx; | |
2709 | for (ix = 0; ix != BITMAP_ELEMENT_WORDS; ix++) | |
2710 | hash ^= ptr->bits[ix]; | |
2711 | } | |
ad7a365a | 2712 | return iterative_hash (&hash, sizeof (hash), 0); |
7aa6d18a SB |
2713 | } |
2714 | ||
096ab9ea | 2715 | \f |
d1e14d97 SB |
2716 | /* Function to obtain a vector of bitmap elements in bit order from |
2717 | HEAD in tree view. */ | |
2718 | ||
2719 | static void | |
2720 | bitmap_tree_to_vec (vec<bitmap_element *> &elts, const_bitmap head) | |
2721 | { | |
2722 | gcc_checking_assert (head->tree_form); | |
2723 | auto_vec<bitmap_element *, 32> stack; | |
2724 | bitmap_element *e = head->first; | |
2725 | while (true) | |
2726 | { | |
2727 | while (e != NULL) | |
2728 | { | |
2729 | stack.safe_push (e); | |
2730 | e = e->prev; | |
2731 | } | |
2732 | if (stack.is_empty ()) | |
2733 | break; | |
2734 | ||
2735 | e = stack.pop (); | |
2736 | elts.safe_push (e); | |
2737 | e = e->next; | |
2738 | } | |
2739 | } | |
2740 | ||
2741 | /* Debugging function to print out the contents of a bitmap element. */ | |
2742 | ||
2743 | DEBUG_FUNCTION void | |
2744 | debug_bitmap_elt_file (FILE *file, const bitmap_element *ptr) | |
2745 | { | |
2746 | unsigned int i, j, col = 26; | |
2747 | ||
2748 | fprintf (file, "\t" HOST_PTR_PRINTF " next = " HOST_PTR_PRINTF | |
2749 | " prev = " HOST_PTR_PRINTF " indx = %u\n\t\tbits = {", | |
2750 | (const void*) ptr, (const void*) ptr->next, | |
2751 | (const void*) ptr->prev, ptr->indx); | |
2752 | ||
2753 | for (i = 0; i < BITMAP_ELEMENT_WORDS; i++) | |
2754 | for (j = 0; j < BITMAP_WORD_BITS; j++) | |
2755 | if ((ptr->bits[i] >> j) & 1) | |
2756 | { | |
2757 | if (col > 70) | |
2758 | { | |
2759 | fprintf (file, "\n\t\t\t"); | |
2760 | col = 24; | |
2761 | } | |
2762 | ||
2763 | fprintf (file, " %u", (ptr->indx * BITMAP_ELEMENT_ALL_BITS | |
2764 | + i * BITMAP_WORD_BITS + j)); | |
2765 | col += 4; | |
2766 | } | |
2767 | ||
2768 | fprintf (file, " }\n"); | |
2769 | } | |
2770 | ||
096ab9ea RK |
2771 | /* Debugging function to print out the contents of a bitmap. */ |
2772 | ||
24e47c76 | 2773 | DEBUG_FUNCTION void |
e326eeb5 | 2774 | debug_bitmap_file (FILE *file, const_bitmap head) |
096ab9ea | 2775 | { |
e326eeb5 | 2776 | const bitmap_element *ptr; |
096ab9ea | 2777 | |
edb89024 DR |
2778 | fprintf (file, "\nfirst = " HOST_PTR_PRINTF |
2779 | " current = " HOST_PTR_PRINTF " indx = %u\n", | |
75b6f3fd | 2780 | (void *) head->first, (void *) head->current, head->indx); |
096ab9ea | 2781 | |
d1e14d97 | 2782 | if (head->tree_form) |
096ab9ea | 2783 | { |
d1e14d97 SB |
2784 | auto_vec<bitmap_element *, 32> elts; |
2785 | bitmap_tree_to_vec (elts, head); | |
2786 | for (unsigned i = 0; i < elts.length (); ++i) | |
2787 | debug_bitmap_elt_file (file, elts[i]); | |
096ab9ea | 2788 | } |
d1e14d97 SB |
2789 | else |
2790 | for (ptr = head->first; ptr; ptr = ptr->next) | |
2791 | debug_bitmap_elt_file (file, ptr); | |
096ab9ea | 2792 | } |
a615c28a | 2793 | |
096ab9ea RK |
2794 | /* Function to be called from the debugger to print the contents |
2795 | of a bitmap. */ | |
2796 | ||
24e47c76 | 2797 | DEBUG_FUNCTION void |
e326eeb5 | 2798 | debug_bitmap (const_bitmap head) |
096ab9ea | 2799 | { |
3d224d46 | 2800 | debug_bitmap_file (stderr, head); |
096ab9ea | 2801 | } |
a615c28a | 2802 | |
bfd38496 | 2803 | /* Function to print out the contents of a bitmap. Unlike debug_bitmap_file, |
22fa5b8a MM |
2804 | it does not print anything but the bits. */ |
2805 | ||
24e47c76 | 2806 | DEBUG_FUNCTION void |
7b3b6ae4 LC |
2807 | bitmap_print (FILE *file, const_bitmap head, const char *prefix, |
2808 | const char *suffix) | |
22fa5b8a | 2809 | { |
5d5993dd | 2810 | const char *comma = ""; |
3cd8c58a | 2811 | unsigned i; |
22fa5b8a MM |
2812 | |
2813 | fputs (prefix, file); | |
d1e14d97 SB |
2814 | if (head->tree_form) |
2815 | { | |
2816 | auto_vec<bitmap_element *, 32> elts; | |
2817 | bitmap_tree_to_vec (elts, head); | |
2818 | for (i = 0; i < elts.length (); ++i) | |
2819 | for (unsigned ix = 0; ix != BITMAP_ELEMENT_WORDS; ++ix) | |
2820 | { | |
2821 | BITMAP_WORD word = elts[i]->bits[ix]; | |
2822 | for (unsigned bit = 0; bit != BITMAP_WORD_BITS; ++bit) | |
2823 | if (word & ((BITMAP_WORD)1 << bit)) | |
2824 | { | |
2825 | fprintf (file, "%s%d", comma, | |
2826 | (bit + BITMAP_WORD_BITS * ix | |
2827 | + elts[i]->indx * BITMAP_ELEMENT_ALL_BITS)); | |
2828 | comma = ", "; | |
2829 | } | |
2830 | } | |
2831 | } | |
2832 | else | |
87c476a2 | 2833 | { |
d1e14d97 SB |
2834 | bitmap_iterator bi; |
2835 | EXECUTE_IF_SET_IN_BITMAP (head, 0, i, bi) | |
2836 | { | |
2837 | fprintf (file, "%s%d", comma, i); | |
2838 | comma = ", "; | |
2839 | } | |
87c476a2 | 2840 | } |
22fa5b8a MM |
2841 | fputs (suffix, file); |
2842 | } | |
f75709c6 | 2843 | |
f75709c6 JH |
2844 | /* Output per-bitmap memory usage statistics. */ |
2845 | void | |
2846 | dump_bitmap_statistics (void) | |
2847 | { | |
ca30789c | 2848 | if (!GATHER_STATISTICS) |
7aa6d18a SB |
2849 | return; |
2850 | ||
643e0a30 | 2851 | bitmap_mem_desc.dump (BITMAP_ORIGIN); |
1af4bba8 JH |
2852 | } |
2853 | ||
7b3b6ae4 | 2854 | DEBUG_FUNCTION void |
84562394 | 2855 | debug (const bitmap_head &ref) |
7b3b6ae4 LC |
2856 | { |
2857 | dump_bitmap (stderr, &ref); | |
2858 | } | |
2859 | ||
2860 | DEBUG_FUNCTION void | |
84562394 | 2861 | debug (const bitmap_head *ptr) |
7b3b6ae4 LC |
2862 | { |
2863 | if (ptr) | |
2864 | debug (*ptr); | |
2865 | else | |
2866 | fprintf (stderr, "<nil>\n"); | |
2867 | } | |
2868 | ||
3d0a7271 AH |
2869 | DEBUG_FUNCTION void |
2870 | debug (const auto_bitmap &ref) | |
2871 | { | |
2872 | debug ((const bitmap_head &) ref); | |
2873 | } | |
2874 | ||
2875 | DEBUG_FUNCTION void | |
2876 | debug (const auto_bitmap *ptr) | |
2877 | { | |
2878 | debug ((const bitmap_head *) ptr); | |
2879 | } | |
2880 | ||
54994253 AH |
2881 | void |
2882 | bitmap_head::dump () | |
2883 | { | |
2884 | debug (this); | |
2885 | } | |
2886 | ||
d9b950dd DM |
2887 | #if CHECKING_P |
2888 | ||
2889 | namespace selftest { | |
2890 | ||
2891 | /* Selftests for bitmaps. */ | |
2892 | ||
2893 | /* Freshly-created bitmaps ought to be empty. */ | |
2894 | ||
2895 | static void | |
2896 | test_gc_alloc () | |
2897 | { | |
2898 | bitmap b = bitmap_gc_alloc (); | |
2899 | ASSERT_TRUE (bitmap_empty_p (b)); | |
2900 | } | |
2901 | ||
2902 | /* Verify bitmap_set_range. */ | |
2903 | ||
2904 | static void | |
2905 | test_set_range () | |
2906 | { | |
2907 | bitmap b = bitmap_gc_alloc (); | |
2908 | ASSERT_TRUE (bitmap_empty_p (b)); | |
2909 | ||
2910 | bitmap_set_range (b, 7, 5); | |
2911 | ASSERT_FALSE (bitmap_empty_p (b)); | |
2912 | ASSERT_EQ (5, bitmap_count_bits (b)); | |
2913 | ||
2914 | /* Verify bitmap_bit_p at the boundaries. */ | |
2915 | ASSERT_FALSE (bitmap_bit_p (b, 6)); | |
2916 | ASSERT_TRUE (bitmap_bit_p (b, 7)); | |
2917 | ASSERT_TRUE (bitmap_bit_p (b, 11)); | |
2918 | ASSERT_FALSE (bitmap_bit_p (b, 12)); | |
2919 | } | |
2920 | ||
2921 | /* Verify splitting a range into two pieces using bitmap_clear_bit. */ | |
2922 | ||
2923 | static void | |
2924 | test_clear_bit_in_middle () | |
2925 | { | |
2926 | bitmap b = bitmap_gc_alloc (); | |
2927 | ||
2928 | /* Set b to [100..200]. */ | |
2929 | bitmap_set_range (b, 100, 100); | |
2930 | ASSERT_EQ (100, bitmap_count_bits (b)); | |
2931 | ||
2932 | /* Clear a bit in the middle. */ | |
2933 | bool changed = bitmap_clear_bit (b, 150); | |
2934 | ASSERT_TRUE (changed); | |
2935 | ASSERT_EQ (99, bitmap_count_bits (b)); | |
2936 | ASSERT_TRUE (bitmap_bit_p (b, 149)); | |
2937 | ASSERT_FALSE (bitmap_bit_p (b, 150)); | |
2938 | ASSERT_TRUE (bitmap_bit_p (b, 151)); | |
2939 | } | |
2940 | ||
2941 | /* Verify bitmap_copy. */ | |
2942 | ||
2943 | static void | |
2944 | test_copying () | |
2945 | { | |
2946 | bitmap src = bitmap_gc_alloc (); | |
2947 | bitmap_set_range (src, 40, 10); | |
2948 | ||
2949 | bitmap dst = bitmap_gc_alloc (); | |
2950 | ASSERT_FALSE (bitmap_equal_p (src, dst)); | |
2951 | bitmap_copy (dst, src); | |
2952 | ASSERT_TRUE (bitmap_equal_p (src, dst)); | |
2953 | ||
2954 | /* Verify that we can make them unequal again... */ | |
2955 | bitmap_set_range (src, 70, 5); | |
2956 | ASSERT_FALSE (bitmap_equal_p (src, dst)); | |
2957 | ||
2958 | /* ...and that changing src after the copy didn't affect | |
2959 | the other: */ | |
2960 | ASSERT_FALSE (bitmap_bit_p (dst, 70)); | |
2961 | } | |
2962 | ||
2963 | /* Verify bitmap_single_bit_set_p. */ | |
2964 | ||
2965 | static void | |
2966 | test_bitmap_single_bit_set_p () | |
2967 | { | |
2968 | bitmap b = bitmap_gc_alloc (); | |
2969 | ||
2970 | ASSERT_FALSE (bitmap_single_bit_set_p (b)); | |
2971 | ||
2972 | bitmap_set_range (b, 42, 1); | |
2973 | ASSERT_TRUE (bitmap_single_bit_set_p (b)); | |
2974 | ASSERT_EQ (42, bitmap_first_set_bit (b)); | |
2975 | ||
2976 | bitmap_set_range (b, 1066, 1); | |
2977 | ASSERT_FALSE (bitmap_single_bit_set_p (b)); | |
2978 | ASSERT_EQ (42, bitmap_first_set_bit (b)); | |
2979 | ||
2980 | bitmap_clear_range (b, 0, 100); | |
2981 | ASSERT_TRUE (bitmap_single_bit_set_p (b)); | |
2982 | ASSERT_EQ (1066, bitmap_first_set_bit (b)); | |
2983 | } | |
2984 | ||
5ad089a3 AM |
2985 | /* Verify accessing aligned bit chunks works as expected. */ |
2986 | ||
2987 | static void | |
2988 | test_aligned_chunk (unsigned num_bits) | |
2989 | { | |
2990 | bitmap b = bitmap_gc_alloc (); | |
2991 | int limit = 2 ^ num_bits; | |
2992 | ||
2993 | int index = 3; | |
2994 | for (int x = 0; x < limit; x++) | |
2995 | { | |
2996 | bitmap_set_aligned_chunk (b, index, num_bits, (BITMAP_WORD) x); | |
2997 | ASSERT_TRUE ((int) bitmap_get_aligned_chunk (b, index, num_bits) == x); | |
2998 | ASSERT_TRUE ((int) bitmap_get_aligned_chunk (b, index + 1, | |
2999 | num_bits) == 0); | |
3000 | ASSERT_TRUE ((int) bitmap_get_aligned_chunk (b, index - 1, | |
3001 | num_bits) == 0); | |
3002 | index += 3; | |
3003 | } | |
3004 | index = 3; | |
3005 | for (int x = 0; x < limit ; x++) | |
3006 | { | |
3007 | ASSERT_TRUE ((int) bitmap_get_aligned_chunk (b, index, num_bits) == x); | |
3008 | index += 3; | |
3009 | } | |
3010 | } | |
3011 | ||
d9b950dd DM |
3012 | /* Run all of the selftests within this file. */ |
3013 | ||
3014 | void | |
d5148d4f | 3015 | bitmap_cc_tests () |
d9b950dd DM |
3016 | { |
3017 | test_gc_alloc (); | |
3018 | test_set_range (); | |
3019 | test_clear_bit_in_middle (); | |
3020 | test_copying (); | |
3021 | test_bitmap_single_bit_set_p (); | |
5ad089a3 AM |
3022 | /* Test 2, 4 and 8 bit aligned chunks. */ |
3023 | test_aligned_chunk (2); | |
3024 | test_aligned_chunk (4); | |
3025 | test_aligned_chunk (8); | |
d9b950dd DM |
3026 | } |
3027 | ||
3028 | } // namespace selftest | |
3029 | #endif /* CHECKING_P */ | |
7b3b6ae4 | 3030 | |
e2500fed | 3031 | #include "gt-bitmap.h" |