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isl_map_simplify.c: remove unused set_swap_inequality
[isl.git] / isl_constraint.c
blob6b3ed93d7857c693b019d77b61f3420ead6922c9
1 /*
2 * Copyright 2008-2009 Katholieke Universiteit Leuven
3 * Copyright 2010 INRIA Saclay
4 *
5 * Use of this software is governed by the GNU LGPLv2.1 license
6 *
7 * Written by Sven Verdoolaege, K.U.Leuven, Departement
8 * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
9 * and INRIA Saclay - Ile-de-France, Parc Club Orsay Universite,
10 * ZAC des vignes, 4 rue Jacques Monod, 91893 Orsay, France
11 */
12
13 #include <isl_map_private.h>
14 #include <isl/constraint.h>
15 #include <isl_dim_private.h>
16 #include <isl_div_private.h>
17 #include <isl/seq.h>
18 #include <isl_aff_private.h>
19
20 isl_ctx *isl_constraint_get_ctx(__isl_keep isl_constraint *c)
21 {
22 return c ? c->ctx : NULL;
23 }
24
25 static unsigned n(struct isl_constraint *c, enum isl_dim_type type)
26 {
27 return isl_basic_map_dim(c->bmap, type);
28 }
29
30 static unsigned offset(struct isl_constraint *c, enum isl_dim_type type)
31 {
32 struct isl_dim *dim = c->bmap->dim;
33 switch (type) {
34 case isl_dim_param: return 1;
35 case isl_dim_in: return 1 + dim->nparam;
36 case isl_dim_out: return 1 + dim->nparam + dim->n_in;
37 case isl_dim_div: return 1 + dim->nparam + dim->n_in + dim->n_out;
38 default: return 0;
39 }
40 }
41
42 static unsigned basic_map_offset(__isl_keep isl_basic_map *bmap,
43 enum isl_dim_type type)
44 {
45 return type == isl_dim_div ? 1 + isl_dim_total(bmap->dim)
46 : 1 + isl_dim_offset(bmap->dim, type);
47 }
48
49 static unsigned basic_set_offset(struct isl_basic_set *bset,
50 enum isl_dim_type type)
51 {
52 struct isl_dim *dim = bset->dim;
53 switch (type) {
54 case isl_dim_param: return 1;
55 case isl_dim_in: return 1 + dim->nparam;
56 case isl_dim_out: return 1 + dim->nparam + dim->n_in;
57 case isl_dim_div: return 1 + dim->nparam + dim->n_in + dim->n_out;
58 default: return 0;
59 }
60 }
61
62 struct isl_constraint *isl_basic_map_constraint(struct isl_basic_map *bmap,
63 isl_int **line)
64 {
65 struct isl_constraint *constraint;
66
67 if (!bmap || !line)
68 goto error;
69
70 constraint = isl_alloc_type(bmap->ctx, struct isl_constraint);
71 if (!constraint)
72 goto error;
73
74 constraint->ctx = bmap->ctx;
75 isl_ctx_ref(constraint->ctx);
76 constraint->ref = 1;
77 constraint->bmap = bmap;
78 constraint->line = line;
79
80 return constraint;
81 error:
82 isl_basic_map_free(bmap);
83 return NULL;
84 }
85
86 struct isl_constraint *isl_basic_set_constraint(struct isl_basic_set *bset,
87 isl_int **line)
88 {
89 return isl_basic_map_constraint((struct isl_basic_map *)bset, line);
90 }
91
92 struct isl_constraint *isl_equality_alloc(struct isl_dim *dim)
93 {
94 struct isl_basic_map *bmap;
95
96 if (!dim)
97 return NULL;
98
99 bmap = isl_basic_map_alloc_dim(dim, 0, 1, 0);
100 if (!bmap)
101 return NULL;
102
103 isl_basic_map_alloc_equality(bmap);
104 isl_seq_clr(bmap->eq[0], 1 + isl_basic_map_total_dim(bmap));
105 return isl_basic_map_constraint(bmap, &bmap->eq[0]);
106 }
107
108 struct isl_constraint *isl_inequality_alloc(struct isl_dim *dim)
109 {
110 struct isl_basic_map *bmap;
111
112 if (!dim)
113 return NULL;
114
115 bmap = isl_basic_map_alloc_dim(dim, 0, 0, 1);
116 if (!bmap)
117 return NULL;
118
119 isl_basic_map_alloc_inequality(bmap);
120 isl_seq_clr(bmap->ineq[0], 1 + isl_basic_map_total_dim(bmap));
121 return isl_basic_map_constraint(bmap, &bmap->ineq[0]);
122 }
123
124 struct isl_constraint *isl_constraint_dup(struct isl_constraint *c)
125 {
126 struct isl_basic_map *bmap;
127 int i;
128 int eq;
129
130 if (!c)
131 return NULL;
132
133 eq = c->line < c->bmap->eq + c->bmap->n_eq;
134 i = eq ? c->line - c->bmap->eq : c->line - c->bmap->ineq;
135 bmap = isl_basic_map_copy(c->bmap);
136 if (!bmap)
137 return NULL;
138 return isl_basic_map_constraint(bmap, eq ? bmap->eq + i : bmap->ineq + i);
139 }
140
141 struct isl_constraint *isl_constraint_cow(struct isl_constraint *c)
142 {
143 if (!c)
144 return NULL;
145
146 if (c->ref == 1)
147 return c;
148 c->ref--;
149 return isl_constraint_dup(c);
150 }
151
152 struct isl_constraint *isl_constraint_copy(struct isl_constraint *constraint)
153 {
154 if (!constraint)
155 return NULL;
156
157 constraint->ref++;
158 return constraint;
159 }
160
161 void isl_constraint_free(struct isl_constraint *c)
162 {
163 if (!c)
164 return;
165
166 if (--c->ref > 0)
167 return;
168
169 isl_basic_map_free(c->bmap);
170 isl_ctx_deref(c->ctx);
171 free(c);
172 }
173
174 __isl_give isl_constraint *isl_basic_map_first_constraint(
175 __isl_take isl_basic_map *bmap)
176 {
177 if (!bmap)
178 return NULL;
179
180 if (bmap->n_eq > 0)
181 return isl_basic_map_constraint(bmap, &bmap->eq[0]);
182
183 if (bmap->n_ineq > 0)
184 return isl_basic_map_constraint(bmap, &bmap->ineq[0]);
185
186 isl_basic_map_free(bmap);
187 return NULL;
188 }
189
190 __isl_give isl_constraint *isl_basic_set_first_constraint(
191 __isl_take isl_basic_set *bset)
192 {
193 return isl_basic_map_first_constraint((struct isl_basic_map *)bset);
194 }
195
196 struct isl_constraint *isl_constraint_next(struct isl_constraint *c)
197 {
198 c = isl_constraint_cow(c);
199 if (c->line >= c->bmap->eq) {
200 c->line++;
201 if (c->line < c->bmap->eq + c->bmap->n_eq)
202 return c;
203 c->line = c->bmap->ineq;
204 } else
205 c->line++;
206 if (c->line < c->bmap->ineq + c->bmap->n_ineq)
207 return c;
208 isl_constraint_free(c);
209 return NULL;
210 }
211
212 int isl_basic_map_foreach_constraint(__isl_keep isl_basic_map *bmap,
213 int (*fn)(__isl_take isl_constraint *c, void *user), void *user)
214 {
215 int i;
216 struct isl_constraint *c;
217
218 if (!bmap)
219 return -1;
220
221 isl_assert(bmap->ctx, ISL_F_ISSET(bmap, ISL_BASIC_MAP_FINAL),
222 return -1);
223
224 for (i = 0; i < bmap->n_eq; ++i) {
225 c = isl_basic_map_constraint(isl_basic_map_copy(bmap),
226 &bmap->eq[i]);
227 if (!c)
228 return -1;
229 if (fn(c, user) < 0)
230 return -1;
231 }
232
233 for (i = 0; i < bmap->n_ineq; ++i) {
234 c = isl_basic_map_constraint(isl_basic_map_copy(bmap),
235 &bmap->ineq[i]);
236 if (!c)
237 return -1;
238 if (fn(c, user) < 0)
239 return -1;
240 }
241
242 return 0;
243 }
244
245 int isl_basic_set_foreach_constraint(__isl_keep isl_basic_set *bset,
246 int (*fn)(__isl_take isl_constraint *c, void *user), void *user)
247 {
248 return isl_basic_map_foreach_constraint((isl_basic_map *)bset, fn, user);
249 }
250
251 int isl_constraint_is_equal(struct isl_constraint *constraint1,
252 struct isl_constraint *constraint2)
253 {
254 if (!constraint1 || !constraint2)
255 return 0;
256 return constraint1->bmap == constraint2->bmap &&
257 constraint1->line == constraint2->line;
258 }
259
260 struct isl_basic_map *isl_basic_map_add_constraint(
261 struct isl_basic_map *bmap, struct isl_constraint *constraint)
262 {
263 if (!bmap || !constraint)
264 goto error;
265
266 isl_assert(constraint->ctx,
267 isl_dim_equal(bmap->dim, constraint->bmap->dim), goto error);
268
269 bmap = isl_basic_map_intersect(bmap,
270 isl_basic_map_from_constraint(constraint));
271 return bmap;
272 error:
273 isl_basic_map_free(bmap);
274 isl_constraint_free(constraint);
275 return NULL;
276 }
277
278 struct isl_basic_set *isl_basic_set_add_constraint(
279 struct isl_basic_set *bset, struct isl_constraint *constraint)
280 {
281 return (struct isl_basic_set *)
282 isl_basic_map_add_constraint((struct isl_basic_map *)bset,
283 constraint);
284 }
285
286 __isl_give isl_map *isl_map_add_constraint(__isl_take isl_map *map,
287 __isl_take isl_constraint *constraint)
288 {
289 isl_basic_map *bmap;
290
291 bmap = isl_basic_map_from_constraint(constraint);
292 map = isl_map_intersect(map, isl_map_from_basic_map(bmap));
293
294 return map;
295 }
296
297 __isl_give isl_set *isl_set_add_constraint(__isl_take isl_set *set,
298 __isl_take isl_constraint *constraint)
299 {
300 return isl_map_add_constraint(set, constraint);
301 }
302
303 struct isl_constraint *isl_constraint_add_div(struct isl_constraint *constraint,
304 struct isl_div *div, int *pos)
305 {
306 if (!constraint || !div)
307 goto error;
308
309 isl_assert(constraint->ctx,
310 isl_dim_equal(div->bmap->dim, constraint->bmap->dim), goto error);
311 isl_assert(constraint->ctx,
312 constraint->bmap->n_eq + constraint->bmap->n_ineq == 1, goto error);
313
314 constraint->bmap = isl_basic_map_cow(constraint->bmap);
315 constraint->bmap = isl_basic_map_extend_dim(constraint->bmap,
316 isl_dim_copy(constraint->bmap->dim), 1, 0, 0);
317 if (!constraint->bmap)
318 goto error;
319 constraint->line = &constraint->bmap->ineq[0];
320 *pos = isl_basic_map_alloc_div(constraint->bmap);
321 if (*pos < 0)
322 goto error;
323 isl_seq_cpy(constraint->bmap->div[*pos], div->line[0],
324 1 + 1 + isl_basic_map_total_dim(constraint->bmap));
325 isl_div_free(div);
326 return constraint;
327 error:
328 isl_constraint_free(constraint);
329 isl_div_free(div);
330 return NULL;
331 }
332
333 __isl_give isl_dim *isl_constraint_get_dim(
334 __isl_keep isl_constraint *constraint)
335 {
336 return constraint ? isl_basic_map_get_dim(constraint->bmap) : NULL;
337 }
338
339 int isl_constraint_dim(struct isl_constraint *constraint,
340 enum isl_dim_type type)
341 {
342 if (!constraint)
343 return -1;
344 return n(constraint, type);
345 }
346
347 int isl_constraint_involves_dims(__isl_keep isl_constraint *constraint,
348 enum isl_dim_type type, unsigned first, unsigned n)
349 {
350 if (!constraint)
351 return -1;
352
353 if (first + n > isl_basic_set_dim(constraint->bmap, type))
354 isl_die(constraint->ctx, isl_error_invalid,
355 "index out of bounds", return -1);
356
357 first += isl_basic_map_offset(constraint->bmap, type);
358
359 if (isl_seq_first_non_zero(constraint->line[0] + first, n) >= 0)
360 return 1;
361
362 return 0;
363 }
364
365 const char *isl_constraint_get_dim_name(__isl_keep isl_constraint *constraint,
366 enum isl_dim_type type, unsigned pos)
367 {
368 return constraint ?
369 isl_basic_map_get_dim_name(constraint->bmap, type, pos) : NULL;
370 }
371
372 void isl_constraint_get_constant(struct isl_constraint *constraint, isl_int *v)
373 {
374 if (!constraint)
375 return;
376 isl_int_set(*v, constraint->line[0][0]);
377 }
378
379 void isl_constraint_get_coefficient(struct isl_constraint *constraint,
380 enum isl_dim_type type, int pos, isl_int *v)
381 {
382 if (!constraint)
383 return;
384
385 isl_assert(constraint->ctx, pos < n(constraint, type), return);
386 isl_int_set(*v, constraint->line[0][offset(constraint, type) + pos]);
387 }
388
389 struct isl_div *isl_constraint_div(struct isl_constraint *constraint, int pos)
390 {
391 if (!constraint)
392 return NULL;
393
394 isl_assert(constraint->ctx, pos < n(constraint, isl_dim_div),
395 return NULL);
396 isl_assert(constraint->ctx,
397 !isl_int_is_zero(constraint->bmap->div[pos][0]), return NULL);
398 return isl_basic_map_div(isl_basic_map_copy(constraint->bmap), pos);
399 }
400
401 void isl_constraint_set_constant(struct isl_constraint *constraint, isl_int v)
402 {
403 if (!constraint)
404 return;
405 isl_int_set(constraint->line[0][0], v);
406 }
407
408 void isl_constraint_set_constant_si(__isl_keep isl_constraint *constraint,
409 int v)
410 {
411 if (!constraint)
412 return;
413 isl_int_set_si(constraint->line[0][0], v);
414 }
415
416 void isl_constraint_set_coefficient(struct isl_constraint *constraint,
417 enum isl_dim_type type, int pos, isl_int v)
418 {
419 if (!constraint)
420 return;
421
422 isl_assert(constraint->ctx, pos < n(constraint, type), return);
423 isl_int_set(constraint->line[0][offset(constraint, type) + pos], v);
424 }
425
426 void isl_constraint_set_coefficient_si(__isl_keep isl_constraint *constraint,
427 enum isl_dim_type type, int pos, int v)
428 {
429 if (!constraint)
430 return;
431
432 isl_assert(constraint->ctx, pos < n(constraint, type), return);
433 isl_int_set_si(constraint->line[0][offset(constraint, type) + pos], v);
434 }
435
436 void isl_constraint_clear(struct isl_constraint *constraint)
437 {
438 unsigned total;
439
440 if (!constraint)
441 return;
442 total = isl_basic_map_total_dim(constraint->bmap);
443 isl_seq_clr(constraint->line[0], 1 + total);
444 }
445
446 struct isl_constraint *isl_constraint_negate(struct isl_constraint *constraint)
447 {
448 unsigned total;
449
450 if (!constraint)
451 return NULL;
452
453 isl_assert(constraint->ctx, !isl_constraint_is_equality(constraint),
454 goto error);
455 isl_assert(constraint->ctx, constraint->bmap->ref == 1, goto error);
456 total = isl_basic_map_total_dim(constraint->bmap);
457 isl_seq_neg(constraint->line[0], constraint->line[0], 1 + total);
458 isl_int_sub_ui(constraint->line[0][0], constraint->line[0][0], 1);
459 ISL_F_CLR(constraint->bmap, ISL_BASIC_MAP_NORMALIZED);
460 return constraint;
461 error:
462 isl_constraint_free(constraint);
463 return NULL;
464 }
465
466 int isl_constraint_is_equality(struct isl_constraint *constraint)
467 {
468 if (!constraint)
469 return -1;
470 return constraint->line >= constraint->bmap->eq;
471 }
472
473 int isl_constraint_is_div_constraint(__isl_keep isl_constraint *constraint)
474 {
475 int i;
476
477 if (!constraint)
478 return -1;
479 if (isl_constraint_is_equality(constraint))
480 return 0;
481 for (i = 0; i < constraint->bmap->n_div; ++i) {
482 if (isl_int_is_zero(constraint->bmap->div[i][0]))
483 continue;
484 if (isl_basic_map_is_div_constraint(constraint->bmap,
485 constraint->line[0], i))
486 return 1;
487 }
488
489 return 0;
490 }
491
492 /* We manually set ISL_BASIC_SET_FINAL instead of calling
493 * isl_basic_map_finalize because we want to keep the position
494 * of the divs and we therefore do not want to throw away redundant divs.
495 * This is arguably a bit fragile.
496 */
497 __isl_give isl_basic_map *isl_basic_map_from_constraint(
498 __isl_take isl_constraint *constraint)
499 {
500 int k;
501 struct isl_basic_map *bmap;
502 isl_int *c;
503 unsigned total;
504
505 if (!constraint)
506 return NULL;
507
508 if (constraint->bmap->n_eq == 1 && constraint->bmap->n_ineq == 0) {
509 bmap = isl_basic_map_copy(constraint->bmap);
510 isl_constraint_free(constraint);
511 return bmap;
512 }
513
514 bmap = isl_basic_map_universe_like(constraint->bmap);
515 bmap = isl_basic_map_align_divs(bmap, constraint->bmap);
516 bmap = isl_basic_map_cow(bmap);
517 bmap = isl_basic_map_extend_constraints(bmap, 1, 1);
518 if (isl_constraint_is_equality(constraint)) {
519 k = isl_basic_map_alloc_equality(bmap);
520 if (k < 0)
521 goto error;
522 c = bmap->eq[k];
523 }
524 else {
525 k = isl_basic_map_alloc_inequality(bmap);
526 if (k < 0)
527 goto error;
528 c = bmap->ineq[k];
529 }
530 total = isl_basic_map_total_dim(bmap);
531 isl_seq_cpy(c, constraint->line[0], 1 + total);
532 isl_constraint_free(constraint);
533 if (bmap)
534 ISL_F_SET(bmap, ISL_BASIC_SET_FINAL);
535 return bmap;
536 error:
537 isl_constraint_free(constraint);
538 isl_basic_map_free(bmap);
539 return NULL;
540 }
541
542 struct isl_basic_set *isl_basic_set_from_constraint(
543 struct isl_constraint *constraint)
544 {
545 if (!constraint)
546 return NULL;
547
548 isl_assert(constraint->ctx,n(constraint, isl_dim_in) == 0, goto error);
549 return (isl_basic_set *)isl_basic_map_from_constraint(constraint);
550 error:
551 isl_constraint_free(constraint);
552 return NULL;
553 }
554
555 int isl_basic_map_has_defining_equality(
556 __isl_keep isl_basic_map *bmap, enum isl_dim_type type, int pos,
557 __isl_give isl_constraint **c)
558 {
559 int i;
560 unsigned offset;
561 unsigned total;
562
563 if (!bmap)
564 return -1;
565 offset = basic_map_offset(bmap, type);
566 total = isl_basic_map_total_dim(bmap);
567 isl_assert(bmap->ctx, pos < isl_basic_map_dim(bmap, type), return -1);
568 for (i = 0; i < bmap->n_eq; ++i)
569 if (!isl_int_is_zero(bmap->eq[i][offset + pos]) &&
570 isl_seq_first_non_zero(bmap->eq[i]+offset+pos+1,
571 1+total-offset-pos-1) == -1) {
572 *c = isl_basic_map_constraint(isl_basic_map_copy(bmap),
573 &bmap->eq[i]);
574 return 1;
575 }
576 return 0;
577 }
578
579 int isl_basic_set_has_defining_equality(
580 __isl_keep isl_basic_set *bset, enum isl_dim_type type, int pos,
581 __isl_give isl_constraint **c)
582 {
583 return isl_basic_map_has_defining_equality((isl_basic_map *)bset,
584 type, pos, c);
585 }
586
587 int isl_basic_set_has_defining_inequalities(
588 struct isl_basic_set *bset, enum isl_dim_type type, int pos,
589 struct isl_constraint **lower,
590 struct isl_constraint **upper)
591 {
592 int i, j;
593 unsigned offset;
594 unsigned total;
595 isl_int m;
596 isl_int **lower_line, **upper_line;
597
598 if (!bset)
599 return -1;
600 offset = basic_set_offset(bset, type);
601 total = isl_basic_set_total_dim(bset);
602 isl_assert(bset->ctx, pos < isl_basic_set_dim(bset, type), return -1);
603 isl_int_init(m);
604 for (i = 0; i < bset->n_ineq; ++i) {
605 if (isl_int_is_zero(bset->ineq[i][offset + pos]))
606 continue;
607 if (isl_int_is_one(bset->ineq[i][offset + pos]))
608 continue;
609 if (isl_int_is_negone(bset->ineq[i][offset + pos]))
610 continue;
611 if (isl_seq_first_non_zero(bset->ineq[i]+offset+pos+1,
612 1+total-offset-pos-1) != -1)
613 continue;
614 for (j = i + 1; j < bset->n_ineq; ++j) {
615 if (!isl_seq_is_neg(bset->ineq[i]+1, bset->ineq[j]+1,
616 total))
617 continue;
618 isl_int_add(m, bset->ineq[i][0], bset->ineq[j][0]);
619 if (isl_int_abs_ge(m, bset->ineq[i][offset+pos]))
620 continue;
621
622 if (isl_int_is_pos(bset->ineq[i][offset+pos])) {
623 lower_line = &bset->ineq[i];
624 upper_line = &bset->ineq[j];
625 } else {
626 lower_line = &bset->ineq[j];
627 upper_line = &bset->ineq[i];
628 }
629 *lower = isl_basic_set_constraint(
630 isl_basic_set_copy(bset), lower_line);
631 *upper = isl_basic_set_constraint(
632 isl_basic_set_copy(bset), upper_line);
633 isl_int_clear(m);
634 return 1;
635 }
636 }
637 *lower = NULL;
638 *upper = NULL;
639 isl_int_clear(m);
640 return 0;
641 }
642
643 /* Given two constraints "a" and "b" on the variable at position "abs_pos"
644 * (in "a" and "b"), add a constraint to "bset" that ensures that the
645 * bound implied by "a" is (strictly) larger than the bound implied by "b".
646 *
647 * If both constraints imply lower bounds, then this means that "a" is
648 * active in the result.
649 * If both constraints imply upper bounds, then this means that "b" is
650 * active in the result.
651 */
652 static __isl_give isl_basic_set *add_larger_bound_constraint(
653 __isl_take isl_basic_set *bset, isl_int *a, isl_int *b,
654 unsigned abs_pos, int strict)
655 {
656 int k;
657 isl_int t;
658 unsigned total;
659
660 k = isl_basic_set_alloc_inequality(bset);
661 if (k < 0)
662 goto error;
663
664 total = isl_basic_set_dim(bset, isl_dim_all);
665
666 isl_int_init(t);
667 isl_int_neg(t, b[1 + abs_pos]);
668
669 isl_seq_combine(bset->ineq[k], t, a, a[1 + abs_pos], b, 1 + abs_pos);
670 isl_seq_combine(bset->ineq[k] + 1 + abs_pos,
671 t, a + 1 + abs_pos + 1, a[1 + abs_pos], b + 1 + abs_pos + 1,
672 total - abs_pos);
673
674 if (strict)
675 isl_int_sub_ui(bset->ineq[k][0], bset->ineq[k][0], 1);
676
677 isl_int_clear(t);
678
679 return bset;
680 error:
681 isl_basic_set_free(bset);
682 return NULL;
683 }
684
685 /* Add constraints to "context" that ensure that "u" is the smallest
686 * (and therefore active) upper bound on "abs_pos" in "bset" and return
687 * the resulting basic set.
688 */
689 static __isl_give isl_basic_set *set_smallest_upper_bound(
690 __isl_keep isl_basic_set *context,
691 __isl_keep isl_basic_set *bset, unsigned abs_pos, int n_upper, int u)
692 {
693 int j;
694
695 context = isl_basic_set_copy(context);
696 context = isl_basic_set_cow(context);
697
698 context = isl_basic_set_extend_constraints(context, 0, n_upper - 1);
699
700 for (j = 0; j < bset->n_ineq; ++j) {
701 if (j == u)
702 continue;
703 if (!isl_int_is_neg(bset->ineq[j][1 + abs_pos]))
704 continue;
705 context = add_larger_bound_constraint(context,
706 bset->ineq[j], bset->ineq[u], abs_pos, j > u);
707 }
708
709 context = isl_basic_set_simplify(context);
710 context = isl_basic_set_finalize(context);
711
712 return context;
713 }
714
715 /* Add constraints to "context" that ensure that "u" is the largest
716 * (and therefore active) upper bound on "abs_pos" in "bset" and return
717 * the resulting basic set.
718 */
719 static __isl_give isl_basic_set *set_largest_lower_bound(
720 __isl_keep isl_basic_set *context,
721 __isl_keep isl_basic_set *bset, unsigned abs_pos, int n_lower, int l)
722 {
723 int j;
724
725 context = isl_basic_set_copy(context);
726 context = isl_basic_set_cow(context);
727
728 context = isl_basic_set_extend_constraints(context, 0, n_lower - 1);
729
730 for (j = 0; j < bset->n_ineq; ++j) {
731 if (j == l)
732 continue;
733 if (!isl_int_is_pos(bset->ineq[j][1 + abs_pos]))
734 continue;
735 context = add_larger_bound_constraint(context,
736 bset->ineq[l], bset->ineq[j], abs_pos, j > l);
737 }
738
739 context = isl_basic_set_simplify(context);
740 context = isl_basic_set_finalize(context);
741
742 return context;
743 }
744
745 static int foreach_upper_bound(__isl_keep isl_basic_set *bset,
746 enum isl_dim_type type, unsigned abs_pos,
747 __isl_take isl_basic_set *context, int n_upper,
748 int (*fn)(__isl_take isl_constraint *lower,
749 __isl_take isl_constraint *upper,
750 __isl_take isl_basic_set *bset, void *user), void *user)
751 {
752 isl_basic_set *context_i;
753 isl_constraint *upper = NULL;
754 int i;
755
756 for (i = 0; i < bset->n_ineq; ++i) {
757 if (isl_int_is_zero(bset->ineq[i][1 + abs_pos]))
758 continue;
759
760 context_i = set_smallest_upper_bound(context, bset,
761 abs_pos, n_upper, i);
762 if (isl_basic_set_is_empty(context_i)) {
763 isl_basic_set_free(context_i);
764 continue;
765 }
766 upper = isl_basic_set_constraint(isl_basic_set_copy(bset),
767 &bset->ineq[i]);
768 if (!upper || !context_i)
769 goto error;
770 if (fn(NULL, upper, context_i, user) < 0)
771 break;
772 }
773
774 isl_basic_set_free(context);
775
776 if (i < bset->n_ineq)
777 return -1;
778
779 return 0;
780 error:
781 isl_constraint_free(upper);
782 isl_basic_set_free(context_i);
783 isl_basic_set_free(context);
784 return -1;
785 }
786
787 static int foreach_lower_bound(__isl_keep isl_basic_set *bset,
788 enum isl_dim_type type, unsigned abs_pos,
789 __isl_take isl_basic_set *context, int n_lower,
790 int (*fn)(__isl_take isl_constraint *lower,
791 __isl_take isl_constraint *upper,
792 __isl_take isl_basic_set *bset, void *user), void *user)
793 {
794 isl_basic_set *context_i;
795 isl_constraint *lower = NULL;
796 int i;
797
798 for (i = 0; i < bset->n_ineq; ++i) {
799 if (isl_int_is_zero(bset->ineq[i][1 + abs_pos]))
800 continue;
801
802 context_i = set_largest_lower_bound(context, bset,
803 abs_pos, n_lower, i);
804 if (isl_basic_set_is_empty(context_i)) {
805 isl_basic_set_free(context_i);
806 continue;
807 }
808 lower = isl_basic_set_constraint(isl_basic_set_copy(bset),
809 &bset->ineq[i]);
810 if (!lower || !context_i)
811 goto error;
812 if (fn(lower, NULL, context_i, user) < 0)
813 break;
814 }
815
816 isl_basic_set_free(context);
817
818 if (i < bset->n_ineq)
819 return -1;
820
821 return 0;
822 error:
823 isl_constraint_free(lower);
824 isl_basic_set_free(context_i);
825 isl_basic_set_free(context);
826 return -1;
827 }
828
829 static int foreach_bound_pair(__isl_keep isl_basic_set *bset,
830 enum isl_dim_type type, unsigned abs_pos,
831 __isl_take isl_basic_set *context, int n_lower, int n_upper,
832 int (*fn)(__isl_take isl_constraint *lower,
833 __isl_take isl_constraint *upper,
834 __isl_take isl_basic_set *bset, void *user), void *user)
835 {
836 isl_basic_set *context_i, *context_j;
837 isl_constraint *lower = NULL;
838 isl_constraint *upper = NULL;
839 int i, j;
840
841 for (i = 0; i < bset->n_ineq; ++i) {
842 if (!isl_int_is_pos(bset->ineq[i][1 + abs_pos]))
843 continue;
844
845 context_i = set_largest_lower_bound(context, bset,
846 abs_pos, n_lower, i);
847 if (isl_basic_set_is_empty(context_i)) {
848 isl_basic_set_free(context_i);
849 continue;
850 }
851
852 for (j = 0; j < bset->n_ineq; ++j) {
853 if (!isl_int_is_neg(bset->ineq[j][1 + abs_pos]))
854 continue;
855
856 context_j = set_smallest_upper_bound(context_i, bset,
857 abs_pos, n_upper, j);
858 context_j = isl_basic_set_extend_constraints(context_j,
859 0, 1);
860 context_j = add_larger_bound_constraint(context_j,
861 bset->ineq[i], bset->ineq[j], abs_pos, 0);
862 context_j = isl_basic_set_simplify(context_j);
863 context_j = isl_basic_set_finalize(context_j);
864 if (isl_basic_set_is_empty(context_j)) {
865 isl_basic_set_free(context_j);
866 continue;
867 }
868 lower = isl_basic_set_constraint(isl_basic_set_copy(bset),
869 &bset->ineq[i]);
870 upper = isl_basic_set_constraint(isl_basic_set_copy(bset),
871 &bset->ineq[j]);
872 if (!lower || !upper || !context_j)
873 goto error;
874 if (fn(lower, upper, context_j, user) < 0)
875 break;
876 }
877
878 isl_basic_set_free(context_i);
879
880 if (j < bset->n_ineq)
881 break;
882 }
883
884 isl_basic_set_free(context);
885
886 if (i < bset->n_ineq)
887 return -1;
888
889 return 0;
890 error:
891 isl_constraint_free(lower);
892 isl_constraint_free(upper);
893 isl_basic_set_free(context_i);
894 isl_basic_set_free(context_j);
895 isl_basic_set_free(context);
896 return -1;
897 }
898
899 /* For each pair of lower and upper bounds on the variable "pos"
900 * of type "type", call "fn" with these lower and upper bounds and the
901 * set of constraints on the remaining variables where these bounds
902 * are active, i.e., (stricly) larger/smaller than the other lower/upper bounds.
903 *
904 * If the designated variable is equal to an affine combination of the
905 * other variables then fn is called with both lower and upper
906 * set to the corresponding equality.
907 *
908 * If there is no lower (or upper) bound, then NULL is passed
909 * as the corresponding bound.
910 *
911 * We first check if the variable is involved in any equality.
912 * If not, we count the number of lower and upper bounds and
913 * act accordingly.
914 */
915 int isl_basic_set_foreach_bound_pair(__isl_keep isl_basic_set *bset,
916 enum isl_dim_type type, unsigned pos,
917 int (*fn)(__isl_take isl_constraint *lower,
918 __isl_take isl_constraint *upper,
919 __isl_take isl_basic_set *bset, void *user), void *user)
920 {
921 int i;
922 isl_constraint *lower = NULL;
923 isl_constraint *upper = NULL;
924 isl_basic_set *context = NULL;
925 unsigned abs_pos;
926 int n_lower, n_upper;
927
928 if (!bset)
929 return -1;
930 isl_assert(bset->ctx, pos < isl_basic_set_dim(bset, type), return -1);
931 isl_assert(bset->ctx, type == isl_dim_param || type == isl_dim_set,
932 return -1);
933
934 abs_pos = pos;
935 if (type == isl_dim_set)
936 abs_pos += isl_basic_set_dim(bset, isl_dim_param);
937
938 for (i = 0; i < bset->n_eq; ++i) {
939 if (isl_int_is_zero(bset->eq[i][1 + abs_pos]))
940 continue;
941
942 lower = isl_basic_set_constraint(isl_basic_set_copy(bset),
943 &bset->eq[i]);
944 upper = isl_constraint_copy(lower);
945 context = isl_basic_set_remove_dims(isl_basic_set_copy(bset),
946 type, pos, 1);
947 if (!lower || !upper || !context)
948 goto error;
949 return fn(lower, upper, context, user);
950 }
951
952 n_lower = 0;
953 n_upper = 0;
954 for (i = 0; i < bset->n_ineq; ++i) {
955 if (isl_int_is_pos(bset->ineq[i][1 + abs_pos]))
956 n_lower++;
957 else if (isl_int_is_neg(bset->ineq[i][1 + abs_pos]))
958 n_upper++;
959 }
960
961 context = isl_basic_set_copy(bset);
962 context = isl_basic_set_cow(context);
963 if (!context)
964 goto error;
965 for (i = context->n_ineq - 1; i >= 0; --i)
966 if (!isl_int_is_zero(context->ineq[i][1 + abs_pos]))
967 isl_basic_set_drop_inequality(context, i);
968
969 context = isl_basic_set_drop(context, type, pos, 1);
970 if (!n_lower && !n_upper)
971 return fn(NULL, NULL, context, user);
972 if (!n_lower)
973 return foreach_upper_bound(bset, type, abs_pos, context, n_upper,
974 fn, user);
975 if (!n_upper)
976 return foreach_lower_bound(bset, type, abs_pos, context, n_lower,
977 fn, user);
978 return foreach_bound_pair(bset, type, abs_pos, context, n_lower, n_upper,
979 fn, user);
980 error:
981 isl_constraint_free(lower);
982 isl_constraint_free(upper);
983 isl_basic_set_free(context);
984 return -1;
985 }
986
987 __isl_give isl_aff *isl_constraint_get_bound(
988 __isl_keep isl_constraint *constraint, enum isl_dim_type type, int pos)
989 {
990 isl_aff *aff;
991 isl_local_space *ls;
992
993 if (!constraint)
994 return NULL;
995 if (pos >= isl_basic_set_dim(constraint->bmap, type))
996 isl_die(constraint->ctx, isl_error_invalid,
997 "index out of bounds", return NULL);
998 if (!isl_basic_map_may_be_set(constraint->bmap))
999 isl_die(constraint->ctx, isl_error_invalid,
1000 "not a set constraint", return NULL);
1001
1002 pos += offset(constraint, type);
1003 if (isl_int_is_zero(constraint->line[0][pos]))
1004 isl_die(constraint->ctx, isl_error_invalid,
1005 "constraint does not define a bound on given dimension",
1006 return NULL);
1007
1008 ls = isl_basic_set_get_local_space(constraint->bmap);
1009 aff = isl_aff_alloc(ls);
1010 if (!aff)
1011 return NULL;
1012
1013 if (isl_int_is_neg(constraint->line[0][pos]))
1014 isl_seq_cpy(aff->v->el + 1, constraint->line[0],
1015 aff->v->size - 1);
1016 else
1017 isl_seq_neg(aff->v->el + 1, constraint->line[0],
1018 aff->v->size - 1);
1019 isl_int_set_si(aff->v->el[1 + pos], 0);
1020 isl_int_abs(aff->v->el[0], constraint->line[0][pos]);
1021
1022 return aff;
1023 }
1024
1025 /* Construct an equality constraint equating the given affine expression
1026 * to zero.
1027 */
1028 __isl_give isl_constraint *isl_equality_from_aff(__isl_take isl_aff *aff)
1029 {
1030 int k;
1031 isl_basic_set *bset;
1032
1033 if (!aff)
1034 return NULL;
1035
1036 bset = isl_basic_set_from_local_space(isl_aff_get_local_space(aff));
1037 bset = isl_basic_set_extend_constraints(bset, 1, 0);
1038 k = isl_basic_set_alloc_equality(bset);
1039 if (k < 0)
1040 goto error;
1041
1042 isl_seq_cpy(bset->eq[k], aff->v->el + 1, aff->v->size - 1);
1043 isl_aff_free(aff);
1044
1045 return isl_basic_set_constraint(bset, &bset->eq[k]);
1046 error:
1047 isl_aff_free(aff);
1048 isl_basic_set_free(bset);
1049 return NULL;
1050 }
Integer set library