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isl_stream: keep track of textual representation of tokens for better error reporting
[isl.git] / isl_polynomial.c
blobdd54e37d4866202affb2807f6d6a71757e19e2f4
1 /*
2 * Copyright 2010 INRIA Saclay
3 *
4 * Use of this software is governed by the GNU LGPLv2.1 license
5 *
6 * Written by Sven Verdoolaege, INRIA Saclay - Ile-de-France,
7 * Parc Club Orsay Universite, ZAC des vignes, 4 rue Jacques Monod,
8 * 91893 Orsay, France
9 */
10
11 #include <stdlib.h>
12 #include <isl_map_private.h>
13 #include <isl_factorization.h>
14 #include <isl/lp.h>
15 #include <isl/seq.h>
16 #include <isl_union_map_private.h>
17 #include <isl_polynomial_private.h>
18 #include <isl_point_private.h>
19 #include <isl_dim_private.h>
20 #include <isl_mat_private.h>
21 #include <isl_range.h>
22
23 static unsigned pos(__isl_keep isl_dim *dim, enum isl_dim_type type)
24 {
25 switch (type) {
26 case isl_dim_param: return 0;
27 case isl_dim_in: return dim->nparam;
28 case isl_dim_out: return dim->nparam + dim->n_in;
29 default: return 0;
30 }
31 }
32
33 int isl_upoly_is_cst(__isl_keep struct isl_upoly *up)
34 {
35 if (!up)
36 return -1;
37
38 return up->var < 0;
39 }
40
41 __isl_keep struct isl_upoly_cst *isl_upoly_as_cst(__isl_keep struct isl_upoly *up)
42 {
43 if (!up)
44 return NULL;
45
46 isl_assert(up->ctx, up->var < 0, return NULL);
47
48 return (struct isl_upoly_cst *)up;
49 }
50
51 __isl_keep struct isl_upoly_rec *isl_upoly_as_rec(__isl_keep struct isl_upoly *up)
52 {
53 if (!up)
54 return NULL;
55
56 isl_assert(up->ctx, up->var >= 0, return NULL);
57
58 return (struct isl_upoly_rec *)up;
59 }
60
61 int isl_upoly_is_equal(__isl_keep struct isl_upoly *up1,
62 __isl_keep struct isl_upoly *up2)
63 {
64 int i;
65 struct isl_upoly_rec *rec1, *rec2;
66
67 if (!up1 || !up2)
68 return -1;
69 if (up1 == up2)
70 return 1;
71 if (up1->var != up2->var)
72 return 0;
73 if (isl_upoly_is_cst(up1)) {
74 struct isl_upoly_cst *cst1, *cst2;
75 cst1 = isl_upoly_as_cst(up1);
76 cst2 = isl_upoly_as_cst(up2);
77 if (!cst1 || !cst2)
78 return -1;
79 return isl_int_eq(cst1->n, cst2->n) &&
80 isl_int_eq(cst1->d, cst2->d);
81 }
82
83 rec1 = isl_upoly_as_rec(up1);
84 rec2 = isl_upoly_as_rec(up2);
85 if (!rec1 || !rec2)
86 return -1;
87
88 if (rec1->n != rec2->n)
89 return 0;
90
91 for (i = 0; i < rec1->n; ++i) {
92 int eq = isl_upoly_is_equal(rec1->p[i], rec2->p[i]);
93 if (eq < 0 || !eq)
94 return eq;
95 }
96
97 return 1;
98 }
99
100 int isl_upoly_is_zero(__isl_keep struct isl_upoly *up)
101 {
102 struct isl_upoly_cst *cst;
103
104 if (!up)
105 return -1;
106 if (!isl_upoly_is_cst(up))
107 return 0;
108
109 cst = isl_upoly_as_cst(up);
110 if (!cst)
111 return -1;
112
113 return isl_int_is_zero(cst->n) && isl_int_is_pos(cst->d);
114 }
115
116 int isl_upoly_sgn(__isl_keep struct isl_upoly *up)
117 {
118 struct isl_upoly_cst *cst;
119
120 if (!up)
121 return 0;
122 if (!isl_upoly_is_cst(up))
123 return 0;
124
125 cst = isl_upoly_as_cst(up);
126 if (!cst)
127 return 0;
128
129 return isl_int_sgn(cst->n);
130 }
131
132 int isl_upoly_is_nan(__isl_keep struct isl_upoly *up)
133 {
134 struct isl_upoly_cst *cst;
135
136 if (!up)
137 return -1;
138 if (!isl_upoly_is_cst(up))
139 return 0;
140
141 cst = isl_upoly_as_cst(up);
142 if (!cst)
143 return -1;
144
145 return isl_int_is_zero(cst->n) && isl_int_is_zero(cst->d);
146 }
147
148 int isl_upoly_is_infty(__isl_keep struct isl_upoly *up)
149 {
150 struct isl_upoly_cst *cst;
151
152 if (!up)
153 return -1;
154 if (!isl_upoly_is_cst(up))
155 return 0;
156
157 cst = isl_upoly_as_cst(up);
158 if (!cst)
159 return -1;
160
161 return isl_int_is_pos(cst->n) && isl_int_is_zero(cst->d);
162 }
163
164 int isl_upoly_is_neginfty(__isl_keep struct isl_upoly *up)
165 {
166 struct isl_upoly_cst *cst;
167
168 if (!up)
169 return -1;
170 if (!isl_upoly_is_cst(up))
171 return 0;
172
173 cst = isl_upoly_as_cst(up);
174 if (!cst)
175 return -1;
176
177 return isl_int_is_neg(cst->n) && isl_int_is_zero(cst->d);
178 }
179
180 int isl_upoly_is_one(__isl_keep struct isl_upoly *up)
181 {
182 struct isl_upoly_cst *cst;
183
184 if (!up)
185 return -1;
186 if (!isl_upoly_is_cst(up))
187 return 0;
188
189 cst = isl_upoly_as_cst(up);
190 if (!cst)
191 return -1;
192
193 return isl_int_eq(cst->n, cst->d) && isl_int_is_pos(cst->d);
194 }
195
196 int isl_upoly_is_negone(__isl_keep struct isl_upoly *up)
197 {
198 struct isl_upoly_cst *cst;
199
200 if (!up)
201 return -1;
202 if (!isl_upoly_is_cst(up))
203 return 0;
204
205 cst = isl_upoly_as_cst(up);
206 if (!cst)
207 return -1;
208
209 return isl_int_is_negone(cst->n) && isl_int_is_one(cst->d);
210 }
211
212 __isl_give struct isl_upoly_cst *isl_upoly_cst_alloc(struct isl_ctx *ctx)
213 {
214 struct isl_upoly_cst *cst;
215
216 cst = isl_alloc_type(ctx, struct isl_upoly_cst);
217 if (!cst)
218 return NULL;
219
220 cst->up.ref = 1;
221 cst->up.ctx = ctx;
222 isl_ctx_ref(ctx);
223 cst->up.var = -1;
224
225 isl_int_init(cst->n);
226 isl_int_init(cst->d);
227
228 return cst;
229 }
230
231 __isl_give struct isl_upoly *isl_upoly_zero(struct isl_ctx *ctx)
232 {
233 struct isl_upoly_cst *cst;
234
235 cst = isl_upoly_cst_alloc(ctx);
236 if (!cst)
237 return NULL;
238
239 isl_int_set_si(cst->n, 0);
240 isl_int_set_si(cst->d, 1);
241
242 return &cst->up;
243 }
244
245 __isl_give struct isl_upoly *isl_upoly_one(struct isl_ctx *ctx)
246 {
247 struct isl_upoly_cst *cst;
248
249 cst = isl_upoly_cst_alloc(ctx);
250 if (!cst)
251 return NULL;
252
253 isl_int_set_si(cst->n, 1);
254 isl_int_set_si(cst->d, 1);
255
256 return &cst->up;
257 }
258
259 __isl_give struct isl_upoly *isl_upoly_infty(struct isl_ctx *ctx)
260 {
261 struct isl_upoly_cst *cst;
262
263 cst = isl_upoly_cst_alloc(ctx);
264 if (!cst)
265 return NULL;
266
267 isl_int_set_si(cst->n, 1);
268 isl_int_set_si(cst->d, 0);
269
270 return &cst->up;
271 }
272
273 __isl_give struct isl_upoly *isl_upoly_neginfty(struct isl_ctx *ctx)
274 {
275 struct isl_upoly_cst *cst;
276
277 cst = isl_upoly_cst_alloc(ctx);
278 if (!cst)
279 return NULL;
280
281 isl_int_set_si(cst->n, -1);
282 isl_int_set_si(cst->d, 0);
283
284 return &cst->up;
285 }
286
287 __isl_give struct isl_upoly *isl_upoly_nan(struct isl_ctx *ctx)
288 {
289 struct isl_upoly_cst *cst;
290
291 cst = isl_upoly_cst_alloc(ctx);
292 if (!cst)
293 return NULL;
294
295 isl_int_set_si(cst->n, 0);
296 isl_int_set_si(cst->d, 0);
297
298 return &cst->up;
299 }
300
301 __isl_give struct isl_upoly *isl_upoly_rat_cst(struct isl_ctx *ctx,
302 isl_int n, isl_int d)
303 {
304 struct isl_upoly_cst *cst;
305
306 cst = isl_upoly_cst_alloc(ctx);
307 if (!cst)
308 return NULL;
309
310 isl_int_set(cst->n, n);
311 isl_int_set(cst->d, d);
312
313 return &cst->up;
314 }
315
316 __isl_give struct isl_upoly_rec *isl_upoly_alloc_rec(struct isl_ctx *ctx,
317 int var, int size)
318 {
319 struct isl_upoly_rec *rec;
320
321 isl_assert(ctx, var >= 0, return NULL);
322 isl_assert(ctx, size >= 0, return NULL);
323 rec = isl_calloc(ctx, struct isl_upoly_rec,
324 sizeof(struct isl_upoly_rec) +
325 (size - 1) * sizeof(struct isl_upoly *));
326 if (!rec)
327 return NULL;
328
329 rec->up.ref = 1;
330 rec->up.ctx = ctx;
331 isl_ctx_ref(ctx);
332 rec->up.var = var;
333
334 rec->n = 0;
335 rec->size = size;
336
337 return rec;
338 }
339
340 __isl_give isl_qpolynomial *isl_qpolynomial_reset_dim(
341 __isl_take isl_qpolynomial *qp, __isl_take isl_dim *dim)
342 {
343 qp = isl_qpolynomial_cow(qp);
344 if (!qp || !dim)
345 goto error;
346
347 isl_dim_free(qp->dim);
348 qp->dim = dim;
349
350 return qp;
351 error:
352 isl_qpolynomial_free(qp);
353 isl_dim_free(dim);
354 return NULL;
355 }
356
357 isl_ctx *isl_qpolynomial_get_ctx(__isl_keep isl_qpolynomial *qp)
358 {
359 return qp ? qp->dim->ctx : NULL;
360 }
361
362 __isl_give isl_dim *isl_qpolynomial_get_dim(__isl_keep isl_qpolynomial *qp)
363 {
364 return qp ? isl_dim_copy(qp->dim) : NULL;
365 }
366
367 unsigned isl_qpolynomial_dim(__isl_keep isl_qpolynomial *qp,
368 enum isl_dim_type type)
369 {
370 return qp ? isl_dim_size(qp->dim, type) : 0;
371 }
372
373 int isl_qpolynomial_is_zero(__isl_keep isl_qpolynomial *qp)
374 {
375 return qp ? isl_upoly_is_zero(qp->upoly) : -1;
376 }
377
378 int isl_qpolynomial_is_one(__isl_keep isl_qpolynomial *qp)
379 {
380 return qp ? isl_upoly_is_one(qp->upoly) : -1;
381 }
382
383 int isl_qpolynomial_is_nan(__isl_keep isl_qpolynomial *qp)
384 {
385 return qp ? isl_upoly_is_nan(qp->upoly) : -1;
386 }
387
388 int isl_qpolynomial_is_infty(__isl_keep isl_qpolynomial *qp)
389 {
390 return qp ? isl_upoly_is_infty(qp->upoly) : -1;
391 }
392
393 int isl_qpolynomial_is_neginfty(__isl_keep isl_qpolynomial *qp)
394 {
395 return qp ? isl_upoly_is_neginfty(qp->upoly) : -1;
396 }
397
398 int isl_qpolynomial_sgn(__isl_keep isl_qpolynomial *qp)
399 {
400 return qp ? isl_upoly_sgn(qp->upoly) : 0;
401 }
402
403 static void upoly_free_cst(__isl_take struct isl_upoly_cst *cst)
404 {
405 isl_int_clear(cst->n);
406 isl_int_clear(cst->d);
407 }
408
409 static void upoly_free_rec(__isl_take struct isl_upoly_rec *rec)
410 {
411 int i;
412
413 for (i = 0; i < rec->n; ++i)
414 isl_upoly_free(rec->p[i]);
415 }
416
417 __isl_give struct isl_upoly *isl_upoly_copy(__isl_keep struct isl_upoly *up)
418 {
419 if (!up)
420 return NULL;
421
422 up->ref++;
423 return up;
424 }
425
426 __isl_give struct isl_upoly *isl_upoly_dup_cst(__isl_keep struct isl_upoly *up)
427 {
428 struct isl_upoly_cst *cst;
429 struct isl_upoly_cst *dup;
430
431 cst = isl_upoly_as_cst(up);
432 if (!cst)
433 return NULL;
434
435 dup = isl_upoly_as_cst(isl_upoly_zero(up->ctx));
436 if (!dup)
437 return NULL;
438 isl_int_set(dup->n, cst->n);
439 isl_int_set(dup->d, cst->d);
440
441 return &dup->up;
442 }
443
444 __isl_give struct isl_upoly *isl_upoly_dup_rec(__isl_keep struct isl_upoly *up)
445 {
446 int i;
447 struct isl_upoly_rec *rec;
448 struct isl_upoly_rec *dup;
449
450 rec = isl_upoly_as_rec(up);
451 if (!rec)
452 return NULL;
453
454 dup = isl_upoly_alloc_rec(up->ctx, up->var, rec->n);
455 if (!dup)
456 return NULL;
457
458 for (i = 0; i < rec->n; ++i) {
459 dup->p[i] = isl_upoly_copy(rec->p[i]);
460 if (!dup->p[i])
461 goto error;
462 dup->n++;
463 }
464
465 return &dup->up;
466 error:
467 isl_upoly_free(&dup->up);
468 return NULL;
469 }
470
471 __isl_give struct isl_upoly *isl_upoly_dup(__isl_keep struct isl_upoly *up)
472 {
473 struct isl_upoly *dup;
474
475 if (!up)
476 return NULL;
477
478 if (isl_upoly_is_cst(up))
479 return isl_upoly_dup_cst(up);
480 else
481 return isl_upoly_dup_rec(up);
482 }
483
484 __isl_give struct isl_upoly *isl_upoly_cow(__isl_take struct isl_upoly *up)
485 {
486 if (!up)
487 return NULL;
488
489 if (up->ref == 1)
490 return up;
491 up->ref--;
492 return isl_upoly_dup(up);
493 }
494
495 void isl_upoly_free(__isl_take struct isl_upoly *up)
496 {
497 if (!up)
498 return;
499
500 if (--up->ref > 0)
501 return;
502
503 if (up->var < 0)
504 upoly_free_cst((struct isl_upoly_cst *)up);
505 else
506 upoly_free_rec((struct isl_upoly_rec *)up);
507
508 isl_ctx_deref(up->ctx);
509 free(up);
510 }
511
512 static void isl_upoly_cst_reduce(__isl_keep struct isl_upoly_cst *cst)
513 {
514 isl_int gcd;
515
516 isl_int_init(gcd);
517 isl_int_gcd(gcd, cst->n, cst->d);
518 if (!isl_int_is_zero(gcd) && !isl_int_is_one(gcd)) {
519 isl_int_divexact(cst->n, cst->n, gcd);
520 isl_int_divexact(cst->d, cst->d, gcd);
521 }
522 isl_int_clear(gcd);
523 }
524
525 __isl_give struct isl_upoly *isl_upoly_sum_cst(__isl_take struct isl_upoly *up1,
526 __isl_take struct isl_upoly *up2)
527 {
528 struct isl_upoly_cst *cst1;
529 struct isl_upoly_cst *cst2;
530
531 up1 = isl_upoly_cow(up1);
532 if (!up1 || !up2)
533 goto error;
534
535 cst1 = isl_upoly_as_cst(up1);
536 cst2 = isl_upoly_as_cst(up2);
537
538 if (isl_int_eq(cst1->d, cst2->d))
539 isl_int_add(cst1->n, cst1->n, cst2->n);
540 else {
541 isl_int_mul(cst1->n, cst1->n, cst2->d);
542 isl_int_addmul(cst1->n, cst2->n, cst1->d);
543 isl_int_mul(cst1->d, cst1->d, cst2->d);
544 }
545
546 isl_upoly_cst_reduce(cst1);
547
548 isl_upoly_free(up2);
549 return up1;
550 error:
551 isl_upoly_free(up1);
552 isl_upoly_free(up2);
553 return NULL;
554 }
555
556 static __isl_give struct isl_upoly *replace_by_zero(
557 __isl_take struct isl_upoly *up)
558 {
559 struct isl_ctx *ctx;
560
561 if (!up)
562 return NULL;
563 ctx = up->ctx;
564 isl_upoly_free(up);
565 return isl_upoly_zero(ctx);
566 }
567
568 static __isl_give struct isl_upoly *replace_by_constant_term(
569 __isl_take struct isl_upoly *up)
570 {
571 struct isl_upoly_rec *rec;
572 struct isl_upoly *cst;
573
574 if (!up)
575 return NULL;
576
577 rec = isl_upoly_as_rec(up);
578 if (!rec)
579 goto error;
580 cst = isl_upoly_copy(rec->p[0]);
581 isl_upoly_free(up);
582 return cst;
583 error:
584 isl_upoly_free(up);
585 return NULL;
586 }
587
588 __isl_give struct isl_upoly *isl_upoly_sum(__isl_take struct isl_upoly *up1,
589 __isl_take struct isl_upoly *up2)
590 {
591 int i;
592 struct isl_upoly_rec *rec1, *rec2;
593
594 if (!up1 || !up2)
595 goto error;
596
597 if (isl_upoly_is_nan(up1)) {
598 isl_upoly_free(up2);
599 return up1;
600 }
601
602 if (isl_upoly_is_nan(up2)) {
603 isl_upoly_free(up1);
604 return up2;
605 }
606
607 if (isl_upoly_is_zero(up1)) {
608 isl_upoly_free(up1);
609 return up2;
610 }
611
612 if (isl_upoly_is_zero(up2)) {
613 isl_upoly_free(up2);
614 return up1;
615 }
616
617 if (up1->var < up2->var)
618 return isl_upoly_sum(up2, up1);
619
620 if (up2->var < up1->var) {
621 struct isl_upoly_rec *rec;
622 if (isl_upoly_is_infty(up2) || isl_upoly_is_neginfty(up2)) {
623 isl_upoly_free(up1);
624 return up2;
625 }
626 up1 = isl_upoly_cow(up1);
627 rec = isl_upoly_as_rec(up1);
628 if (!rec)
629 goto error;
630 rec->p[0] = isl_upoly_sum(rec->p[0], up2);
631 if (rec->n == 1)
632 up1 = replace_by_constant_term(up1);
633 return up1;
634 }
635
636 if (isl_upoly_is_cst(up1))
637 return isl_upoly_sum_cst(up1, up2);
638
639 rec1 = isl_upoly_as_rec(up1);
640 rec2 = isl_upoly_as_rec(up2);
641 if (!rec1 || !rec2)
642 goto error;
643
644 if (rec1->n < rec2->n)
645 return isl_upoly_sum(up2, up1);
646
647 up1 = isl_upoly_cow(up1);
648 rec1 = isl_upoly_as_rec(up1);
649 if (!rec1)
650 goto error;
651
652 for (i = rec2->n - 1; i >= 0; --i) {
653 rec1->p[i] = isl_upoly_sum(rec1->p[i],
654 isl_upoly_copy(rec2->p[i]));
655 if (!rec1->p[i])
656 goto error;
657 if (i == rec1->n - 1 && isl_upoly_is_zero(rec1->p[i])) {
658 isl_upoly_free(rec1->p[i]);
659 rec1->n--;
660 }
661 }
662
663 if (rec1->n == 0)
664 up1 = replace_by_zero(up1);
665 else if (rec1->n == 1)
666 up1 = replace_by_constant_term(up1);
667
668 isl_upoly_free(up2);
669
670 return up1;
671 error:
672 isl_upoly_free(up1);
673 isl_upoly_free(up2);
674 return NULL;
675 }
676
677 __isl_give struct isl_upoly *isl_upoly_cst_add_isl_int(
678 __isl_take struct isl_upoly *up, isl_int v)
679 {
680 struct isl_upoly_cst *cst;
681
682 up = isl_upoly_cow(up);
683 if (!up)
684 return NULL;
685
686 cst = isl_upoly_as_cst(up);
687
688 isl_int_addmul(cst->n, cst->d, v);
689
690 return up;
691 }
692
693 __isl_give struct isl_upoly *isl_upoly_add_isl_int(
694 __isl_take struct isl_upoly *up, isl_int v)
695 {
696 struct isl_upoly_rec *rec;
697
698 if (!up)
699 return NULL;
700
701 if (isl_upoly_is_cst(up))
702 return isl_upoly_cst_add_isl_int(up, v);
703
704 up = isl_upoly_cow(up);
705 rec = isl_upoly_as_rec(up);
706 if (!rec)
707 goto error;
708
709 rec->p[0] = isl_upoly_add_isl_int(rec->p[0], v);
710 if (!rec->p[0])
711 goto error;
712
713 return up;
714 error:
715 isl_upoly_free(up);
716 return NULL;
717 }
718
719 __isl_give struct isl_upoly *isl_upoly_cst_mul_isl_int(
720 __isl_take struct isl_upoly *up, isl_int v)
721 {
722 struct isl_upoly_cst *cst;
723
724 if (isl_upoly_is_zero(up))
725 return up;
726
727 up = isl_upoly_cow(up);
728 if (!up)
729 return NULL;
730
731 cst = isl_upoly_as_cst(up);
732
733 isl_int_mul(cst->n, cst->n, v);
734
735 return up;
736 }
737
738 __isl_give struct isl_upoly *isl_upoly_mul_isl_int(
739 __isl_take struct isl_upoly *up, isl_int v)
740 {
741 int i;
742 struct isl_upoly_rec *rec;
743
744 if (!up)
745 return NULL;
746
747 if (isl_upoly_is_cst(up))
748 return isl_upoly_cst_mul_isl_int(up, v);
749
750 up = isl_upoly_cow(up);
751 rec = isl_upoly_as_rec(up);
752 if (!rec)
753 goto error;
754
755 for (i = 0; i < rec->n; ++i) {
756 rec->p[i] = isl_upoly_mul_isl_int(rec->p[i], v);
757 if (!rec->p[i])
758 goto error;
759 }
760
761 return up;
762 error:
763 isl_upoly_free(up);
764 return NULL;
765 }
766
767 __isl_give struct isl_upoly *isl_upoly_mul_cst(__isl_take struct isl_upoly *up1,
768 __isl_take struct isl_upoly *up2)
769 {
770 struct isl_upoly_cst *cst1;
771 struct isl_upoly_cst *cst2;
772
773 up1 = isl_upoly_cow(up1);
774 if (!up1 || !up2)
775 goto error;
776
777 cst1 = isl_upoly_as_cst(up1);
778 cst2 = isl_upoly_as_cst(up2);
779
780 isl_int_mul(cst1->n, cst1->n, cst2->n);
781 isl_int_mul(cst1->d, cst1->d, cst2->d);
782
783 isl_upoly_cst_reduce(cst1);
784
785 isl_upoly_free(up2);
786 return up1;
787 error:
788 isl_upoly_free(up1);
789 isl_upoly_free(up2);
790 return NULL;
791 }
792
793 __isl_give struct isl_upoly *isl_upoly_mul_rec(__isl_take struct isl_upoly *up1,
794 __isl_take struct isl_upoly *up2)
795 {
796 struct isl_upoly_rec *rec1;
797 struct isl_upoly_rec *rec2;
798 struct isl_upoly_rec *res;
799 int i, j;
800 int size;
801
802 rec1 = isl_upoly_as_rec(up1);
803 rec2 = isl_upoly_as_rec(up2);
804 if (!rec1 || !rec2)
805 goto error;
806 size = rec1->n + rec2->n - 1;
807 res = isl_upoly_alloc_rec(up1->ctx, up1->var, size);
808 if (!res)
809 goto error;
810
811 for (i = 0; i < rec1->n; ++i) {
812 res->p[i] = isl_upoly_mul(isl_upoly_copy(rec2->p[0]),
813 isl_upoly_copy(rec1->p[i]));
814 if (!res->p[i])
815 goto error;
816 res->n++;
817 }
818 for (; i < size; ++i) {
819 res->p[i] = isl_upoly_zero(up1->ctx);
820 if (!res->p[i])
821 goto error;
822 res->n++;
823 }
824 for (i = 0; i < rec1->n; ++i) {
825 for (j = 1; j < rec2->n; ++j) {
826 struct isl_upoly *up;
827 up = isl_upoly_mul(isl_upoly_copy(rec2->p[j]),
828 isl_upoly_copy(rec1->p[i]));
829 res->p[i + j] = isl_upoly_sum(res->p[i + j], up);
830 if (!res->p[i + j])
831 goto error;
832 }
833 }
834
835 isl_upoly_free(up1);
836 isl_upoly_free(up2);
837
838 return &res->up;
839 error:
840 isl_upoly_free(up1);
841 isl_upoly_free(up2);
842 isl_upoly_free(&res->up);
843 return NULL;
844 }
845
846 __isl_give struct isl_upoly *isl_upoly_mul(__isl_take struct isl_upoly *up1,
847 __isl_take struct isl_upoly *up2)
848 {
849 if (!up1 || !up2)
850 goto error;
851
852 if (isl_upoly_is_nan(up1)) {
853 isl_upoly_free(up2);
854 return up1;
855 }
856
857 if (isl_upoly_is_nan(up2)) {
858 isl_upoly_free(up1);
859 return up2;
860 }
861
862 if (isl_upoly_is_zero(up1)) {
863 isl_upoly_free(up2);
864 return up1;
865 }
866
867 if (isl_upoly_is_zero(up2)) {
868 isl_upoly_free(up1);
869 return up2;
870 }
871
872 if (isl_upoly_is_one(up1)) {
873 isl_upoly_free(up1);
874 return up2;
875 }
876
877 if (isl_upoly_is_one(up2)) {
878 isl_upoly_free(up2);
879 return up1;
880 }
881
882 if (up1->var < up2->var)
883 return isl_upoly_mul(up2, up1);
884
885 if (up2->var < up1->var) {
886 int i;
887 struct isl_upoly_rec *rec;
888 if (isl_upoly_is_infty(up2) || isl_upoly_is_neginfty(up2)) {
889 isl_ctx *ctx = up1->ctx;
890 isl_upoly_free(up1);
891 isl_upoly_free(up2);
892 return isl_upoly_nan(ctx);
893 }
894 up1 = isl_upoly_cow(up1);
895 rec = isl_upoly_as_rec(up1);
896 if (!rec)
897 goto error;
898
899 for (i = 0; i < rec->n; ++i) {
900 rec->p[i] = isl_upoly_mul(rec->p[i],
901 isl_upoly_copy(up2));
902 if (!rec->p[i])
903 goto error;
904 }
905 isl_upoly_free(up2);
906 return up1;
907 }
908
909 if (isl_upoly_is_cst(up1))
910 return isl_upoly_mul_cst(up1, up2);
911
912 return isl_upoly_mul_rec(up1, up2);
913 error:
914 isl_upoly_free(up1);
915 isl_upoly_free(up2);
916 return NULL;
917 }
918
919 __isl_give struct isl_upoly *isl_upoly_pow(__isl_take struct isl_upoly *up,
920 unsigned power)
921 {
922 struct isl_upoly *res;
923
924 if (!up)
925 return NULL;
926 if (power == 1)
927 return up;
928
929 if (power % 2)
930 res = isl_upoly_copy(up);
931 else
932 res = isl_upoly_one(up->ctx);
933
934 while (power >>= 1) {
935 up = isl_upoly_mul(up, isl_upoly_copy(up));
936 if (power % 2)
937 res = isl_upoly_mul(res, isl_upoly_copy(up));
938 }
939
940 isl_upoly_free(up);
941 return res;
942 }
943
944 __isl_give isl_qpolynomial *isl_qpolynomial_alloc(__isl_take isl_dim *dim,
945 unsigned n_div, __isl_take struct isl_upoly *up)
946 {
947 struct isl_qpolynomial *qp = NULL;
948 unsigned total;
949
950 if (!dim || !up)
951 goto error;
952
953 total = isl_dim_total(dim);
954
955 qp = isl_calloc_type(dim->ctx, struct isl_qpolynomial);
956 if (!qp)
957 goto error;
958
959 qp->ref = 1;
960 qp->div = isl_mat_alloc(dim->ctx, n_div, 1 + 1 + total + n_div);
961 if (!qp->div)
962 goto error;
963
964 qp->dim = dim;
965 qp->upoly = up;
966
967 return qp;
968 error:
969 isl_dim_free(dim);
970 isl_upoly_free(up);
971 isl_qpolynomial_free(qp);
972 return NULL;
973 }
974
975 __isl_give isl_qpolynomial *isl_qpolynomial_copy(__isl_keep isl_qpolynomial *qp)
976 {
977 if (!qp)
978 return NULL;
979
980 qp->ref++;
981 return qp;
982 }
983
984 __isl_give isl_qpolynomial *isl_qpolynomial_dup(__isl_keep isl_qpolynomial *qp)
985 {
986 struct isl_qpolynomial *dup;
987
988 if (!qp)
989 return NULL;
990
991 dup = isl_qpolynomial_alloc(isl_dim_copy(qp->dim), qp->div->n_row,
992 isl_upoly_copy(qp->upoly));
993 if (!dup)
994 return NULL;
995 isl_mat_free(dup->div);
996 dup->div = isl_mat_copy(qp->div);
997 if (!dup->div)
998 goto error;
999
1000 return dup;
1001 error:
1002 isl_qpolynomial_free(dup);
1003 return NULL;
1004 }
1005
1006 __isl_give isl_qpolynomial *isl_qpolynomial_cow(__isl_take isl_qpolynomial *qp)
1007 {
1008 if (!qp)
1009 return NULL;
1010
1011 if (qp->ref == 1)
1012 return qp;
1013 qp->ref--;
1014 return isl_qpolynomial_dup(qp);
1015 }
1016
1017 void isl_qpolynomial_free(__isl_take isl_qpolynomial *qp)
1018 {
1019 if (!qp)
1020 return;
1021
1022 if (--qp->ref > 0)
1023 return;
1024
1025 isl_dim_free(qp->dim);
1026 isl_mat_free(qp->div);
1027 isl_upoly_free(qp->upoly);
1028
1029 free(qp);
1030 }
1031
1032 __isl_give struct isl_upoly *isl_upoly_var_pow(isl_ctx *ctx, int pos, int power)
1033 {
1034 int i;
1035 struct isl_upoly *up;
1036 struct isl_upoly_rec *rec;
1037 struct isl_upoly_cst *cst;
1038
1039 rec = isl_upoly_alloc_rec(ctx, pos, 1 + power);
1040 if (!rec)
1041 return NULL;
1042 for (i = 0; i < 1 + power; ++i) {
1043 rec->p[i] = isl_upoly_zero(ctx);
1044 if (!rec->p[i])
1045 goto error;
1046 rec->n++;
1047 }
1048 cst = isl_upoly_as_cst(rec->p[power]);
1049 isl_int_set_si(cst->n, 1);
1050
1051 return &rec->up;
1052 error:
1053 isl_upoly_free(&rec->up);
1054 return NULL;
1055 }
1056
1057 /* r array maps original positions to new positions.
1058 */
1059 static __isl_give struct isl_upoly *reorder(__isl_take struct isl_upoly *up,
1060 int *r)
1061 {
1062 int i;
1063 struct isl_upoly_rec *rec;
1064 struct isl_upoly *base;
1065 struct isl_upoly *res;
1066
1067 if (isl_upoly_is_cst(up))
1068 return up;
1069
1070 rec = isl_upoly_as_rec(up);
1071 if (!rec)
1072 goto error;
1073
1074 isl_assert(up->ctx, rec->n >= 1, goto error);
1075
1076 base = isl_upoly_var_pow(up->ctx, r[up->var], 1);
1077 res = reorder(isl_upoly_copy(rec->p[rec->n - 1]), r);
1078
1079 for (i = rec->n - 2; i >= 0; --i) {
1080 res = isl_upoly_mul(res, isl_upoly_copy(base));
1081 res = isl_upoly_sum(res, reorder(isl_upoly_copy(rec->p[i]), r));
1082 }
1083
1084 isl_upoly_free(base);
1085 isl_upoly_free(up);
1086
1087 return res;
1088 error:
1089 isl_upoly_free(up);
1090 return NULL;
1091 }
1092
1093 static int compatible_divs(__isl_keep isl_mat *div1, __isl_keep isl_mat *div2)
1094 {
1095 int n_row, n_col;
1096 int equal;
1097
1098 isl_assert(div1->ctx, div1->n_row >= div2->n_row &&
1099 div1->n_col >= div2->n_col, return -1);
1100
1101 if (div1->n_row == div2->n_row)
1102 return isl_mat_is_equal(div1, div2);
1103
1104 n_row = div1->n_row;
1105 n_col = div1->n_col;
1106 div1->n_row = div2->n_row;
1107 div1->n_col = div2->n_col;
1108
1109 equal = isl_mat_is_equal(div1, div2);
1110
1111 div1->n_row = n_row;
1112 div1->n_col = n_col;
1113
1114 return equal;
1115 }
1116
1117 static void expand_row(__isl_keep isl_mat *dst, int d,
1118 __isl_keep isl_mat *src, int s, int *exp)
1119 {
1120 int i;
1121 unsigned c = src->n_col - src->n_row;
1122
1123 isl_seq_cpy(dst->row[d], src->row[s], c);
1124 isl_seq_clr(dst->row[d] + c, dst->n_col - c);
1125
1126 for (i = 0; i < s; ++i)
1127 isl_int_set(dst->row[d][c + exp[i]], src->row[s][c + i]);
1128 }
1129
1130 static int cmp_row(__isl_keep isl_mat *div, int i, int j)
1131 {
1132 int li, lj;
1133
1134 li = isl_seq_last_non_zero(div->row[i], div->n_col);
1135 lj = isl_seq_last_non_zero(div->row[j], div->n_col);
1136
1137 if (li != lj)
1138 return li - lj;
1139
1140 return isl_seq_cmp(div->row[i], div->row[j], div->n_col);
1141 }
1142
1143 struct isl_div_sort_info {
1144 isl_mat *div;
1145 int row;
1146 };
1147
1148 static int div_sort_cmp(const void *p1, const void *p2)
1149 {
1150 const struct isl_div_sort_info *i1, *i2;
1151 i1 = (const struct isl_div_sort_info *) p1;
1152 i2 = (const struct isl_div_sort_info *) p2;
1153
1154 return cmp_row(i1->div, i1->row, i2->row);
1155 }
1156
1157 /* Sort divs and remove duplicates.
1158 */
1159 static __isl_give isl_qpolynomial *sort_divs(__isl_take isl_qpolynomial *qp)
1160 {
1161 int i;
1162 int skip;
1163 int len;
1164 struct isl_div_sort_info *array = NULL;
1165 int *pos = NULL, *at = NULL;
1166 int *reordering = NULL;
1167 unsigned div_pos;
1168
1169 if (!qp)
1170 return NULL;
1171 if (qp->div->n_row <= 1)
1172 return qp;
1173
1174 div_pos = isl_dim_total(qp->dim);
1175
1176 array = isl_alloc_array(qp->div->ctx, struct isl_div_sort_info,
1177 qp->div->n_row);
1178 pos = isl_alloc_array(qp->div->ctx, int, qp->div->n_row);
1179 at = isl_alloc_array(qp->div->ctx, int, qp->div->n_row);
1180 len = qp->div->n_col - 2;
1181 reordering = isl_alloc_array(qp->div->ctx, int, len);
1182 if (!array || !pos || !at || !reordering)
1183 goto error;
1184
1185 for (i = 0; i < qp->div->n_row; ++i) {
1186 array[i].div = qp->div;
1187 array[i].row = i;
1188 pos[i] = i;
1189 at[i] = i;
1190 }
1191
1192 qsort(array, qp->div->n_row, sizeof(struct isl_div_sort_info),
1193 div_sort_cmp);
1194
1195 for (i = 0; i < div_pos; ++i)
1196 reordering[i] = i;
1197
1198 for (i = 0; i < qp->div->n_row; ++i) {
1199 if (pos[array[i].row] == i)
1200 continue;
1201 qp->div = isl_mat_swap_rows(qp->div, i, pos[array[i].row]);
1202 pos[at[i]] = pos[array[i].row];
1203 at[pos[array[i].row]] = at[i];
1204 at[i] = array[i].row;
1205 pos[array[i].row] = i;
1206 }
1207
1208 skip = 0;
1209 for (i = 0; i < len - div_pos; ++i) {
1210 if (i > 0 &&
1211 isl_seq_eq(qp->div->row[i - skip - 1],
1212 qp->div->row[i - skip], qp->div->n_col)) {
1213 qp->div = isl_mat_drop_rows(qp->div, i - skip, 1);
1214 isl_mat_col_add(qp->div, 2 + div_pos + i - skip - 1,
1215 2 + div_pos + i - skip);
1216 qp->div = isl_mat_drop_cols(qp->div,
1217 2 + div_pos + i - skip, 1);
1218 skip++;
1219 }
1220 reordering[div_pos + array[i].row] = div_pos + i - skip;
1221 }
1222
1223 qp->upoly = reorder(qp->upoly, reordering);
1224
1225 if (!qp->upoly || !qp->div)
1226 goto error;
1227
1228 free(at);
1229 free(pos);
1230 free(array);
1231 free(reordering);
1232
1233 return qp;
1234 error:
1235 free(at);
1236 free(pos);
1237 free(array);
1238 free(reordering);
1239 isl_qpolynomial_free(qp);
1240 return NULL;
1241 }
1242
1243 static __isl_give isl_mat *merge_divs(__isl_keep isl_mat *div1,
1244 __isl_keep isl_mat *div2, int *exp1, int *exp2)
1245 {
1246 int i, j, k;
1247 isl_mat *div = NULL;
1248 unsigned d = div1->n_col - div1->n_row;
1249
1250 div = isl_mat_alloc(div1->ctx, 1 + div1->n_row + div2->n_row,
1251 d + div1->n_row + div2->n_row);
1252 if (!div)
1253 return NULL;
1254
1255 for (i = 0, j = 0, k = 0; i < div1->n_row && j < div2->n_row; ++k) {
1256 int cmp;
1257
1258 expand_row(div, k, div1, i, exp1);
1259 expand_row(div, k + 1, div2, j, exp2);
1260
1261 cmp = cmp_row(div, k, k + 1);
1262 if (cmp == 0) {
1263 exp1[i++] = k;
1264 exp2[j++] = k;
1265 } else if (cmp < 0) {
1266 exp1[i++] = k;
1267 } else {
1268 exp2[j++] = k;
1269 isl_seq_cpy(div->row[k], div->row[k + 1], div->n_col);
1270 }
1271 }
1272 for (; i < div1->n_row; ++i, ++k) {
1273 expand_row(div, k, div1, i, exp1);
1274 exp1[i] = k;
1275 }
1276 for (; j < div2->n_row; ++j, ++k) {
1277 expand_row(div, k, div2, j, exp2);
1278 exp2[j] = k;
1279 }
1280
1281 div->n_row = k;
1282 div->n_col = d + k;
1283
1284 return div;
1285 }
1286
1287 static __isl_give struct isl_upoly *expand(__isl_take struct isl_upoly *up,
1288 int *exp, int first)
1289 {
1290 int i;
1291 struct isl_upoly_rec *rec;
1292
1293 if (isl_upoly_is_cst(up))
1294 return up;
1295
1296 if (up->var < first)
1297 return up;
1298
1299 if (exp[up->var - first] == up->var - first)
1300 return up;
1301
1302 up = isl_upoly_cow(up);
1303 if (!up)
1304 goto error;
1305
1306 up->var = exp[up->var - first] + first;
1307
1308 rec = isl_upoly_as_rec(up);
1309 if (!rec)
1310 goto error;
1311
1312 for (i = 0; i < rec->n; ++i) {
1313 rec->p[i] = expand(rec->p[i], exp, first);
1314 if (!rec->p[i])
1315 goto error;
1316 }
1317
1318 return up;
1319 error:
1320 isl_upoly_free(up);
1321 return NULL;
1322 }
1323
1324 static __isl_give isl_qpolynomial *with_merged_divs(
1325 __isl_give isl_qpolynomial *(*fn)(__isl_take isl_qpolynomial *qp1,
1326 __isl_take isl_qpolynomial *qp2),
1327 __isl_take isl_qpolynomial *qp1, __isl_take isl_qpolynomial *qp2)
1328 {
1329 int *exp1 = NULL;
1330 int *exp2 = NULL;
1331 isl_mat *div = NULL;
1332
1333 qp1 = isl_qpolynomial_cow(qp1);
1334 qp2 = isl_qpolynomial_cow(qp2);
1335
1336 if (!qp1 || !qp2)
1337 goto error;
1338
1339 isl_assert(qp1->div->ctx, qp1->div->n_row >= qp2->div->n_row &&
1340 qp1->div->n_col >= qp2->div->n_col, goto error);
1341
1342 exp1 = isl_alloc_array(qp1->div->ctx, int, qp1->div->n_row);
1343 exp2 = isl_alloc_array(qp2->div->ctx, int, qp2->div->n_row);
1344 if (!exp1 || !exp2)
1345 goto error;
1346
1347 div = merge_divs(qp1->div, qp2->div, exp1, exp2);
1348 if (!div)
1349 goto error;
1350
1351 isl_mat_free(qp1->div);
1352 qp1->div = isl_mat_copy(div);
1353 isl_mat_free(qp2->div);
1354 qp2->div = isl_mat_copy(div);
1355
1356 qp1->upoly = expand(qp1->upoly, exp1, div->n_col - div->n_row - 2);
1357 qp2->upoly = expand(qp2->upoly, exp2, div->n_col - div->n_row - 2);
1358
1359 if (!qp1->upoly || !qp2->upoly)
1360 goto error;
1361
1362 isl_mat_free(div);
1363 free(exp1);
1364 free(exp2);
1365
1366 return fn(qp1, qp2);
1367 error:
1368 isl_mat_free(div);
1369 free(exp1);
1370 free(exp2);
1371 isl_qpolynomial_free(qp1);
1372 isl_qpolynomial_free(qp2);
1373 return NULL;
1374 }
1375
1376 __isl_give isl_qpolynomial *isl_qpolynomial_add(__isl_take isl_qpolynomial *qp1,
1377 __isl_take isl_qpolynomial *qp2)
1378 {
1379 qp1 = isl_qpolynomial_cow(qp1);
1380
1381 if (!qp1 || !qp2)
1382 goto error;
1383
1384 if (qp1->div->n_row < qp2->div->n_row)
1385 return isl_qpolynomial_add(qp2, qp1);
1386
1387 isl_assert(qp1->dim->ctx, isl_dim_equal(qp1->dim, qp2->dim), goto error);
1388 if (!compatible_divs(qp1->div, qp2->div))
1389 return with_merged_divs(isl_qpolynomial_add, qp1, qp2);
1390
1391 qp1->upoly = isl_upoly_sum(qp1->upoly, isl_upoly_copy(qp2->upoly));
1392 if (!qp1->upoly)
1393 goto error;
1394
1395 isl_qpolynomial_free(qp2);
1396
1397 return qp1;
1398 error:
1399 isl_qpolynomial_free(qp1);
1400 isl_qpolynomial_free(qp2);
1401 return NULL;
1402 }
1403
1404 __isl_give isl_qpolynomial *isl_qpolynomial_add_on_domain(
1405 __isl_keep isl_set *dom,
1406 __isl_take isl_qpolynomial *qp1,
1407 __isl_take isl_qpolynomial *qp2)
1408 {
1409 qp1 = isl_qpolynomial_add(qp1, qp2);
1410 qp1 = isl_qpolynomial_gist(qp1, isl_set_copy(dom));
1411 return qp1;
1412 }
1413
1414 __isl_give isl_qpolynomial *isl_qpolynomial_sub(__isl_take isl_qpolynomial *qp1,
1415 __isl_take isl_qpolynomial *qp2)
1416 {
1417 return isl_qpolynomial_add(qp1, isl_qpolynomial_neg(qp2));
1418 }
1419
1420 __isl_give isl_qpolynomial *isl_qpolynomial_add_isl_int(
1421 __isl_take isl_qpolynomial *qp, isl_int v)
1422 {
1423 if (isl_int_is_zero(v))
1424 return qp;
1425
1426 qp = isl_qpolynomial_cow(qp);
1427 if (!qp)
1428 return NULL;
1429
1430 qp->upoly = isl_upoly_add_isl_int(qp->upoly, v);
1431 if (!qp->upoly)
1432 goto error;
1433
1434 return qp;
1435 error:
1436 isl_qpolynomial_free(qp);
1437 return NULL;
1438
1439 }
1440
1441 __isl_give isl_qpolynomial *isl_qpolynomial_neg(__isl_take isl_qpolynomial *qp)
1442 {
1443 if (!qp)
1444 return NULL;
1445
1446 return isl_qpolynomial_mul_isl_int(qp, qp->dim->ctx->negone);
1447 }
1448
1449 __isl_give isl_qpolynomial *isl_qpolynomial_mul_isl_int(
1450 __isl_take isl_qpolynomial *qp, isl_int v)
1451 {
1452 if (isl_int_is_one(v))
1453 return qp;
1454
1455 if (qp && isl_int_is_zero(v)) {
1456 isl_qpolynomial *zero;
1457 zero = isl_qpolynomial_zero(isl_dim_copy(qp->dim));
1458 isl_qpolynomial_free(qp);
1459 return zero;
1460 }
1461
1462 qp = isl_qpolynomial_cow(qp);
1463 if (!qp)
1464 return NULL;
1465
1466 qp->upoly = isl_upoly_mul_isl_int(qp->upoly, v);
1467 if (!qp->upoly)
1468 goto error;
1469
1470 return qp;
1471 error:
1472 isl_qpolynomial_free(qp);
1473 return NULL;
1474 }
1475
1476 __isl_give isl_qpolynomial *isl_qpolynomial_mul(__isl_take isl_qpolynomial *qp1,
1477 __isl_take isl_qpolynomial *qp2)
1478 {
1479 qp1 = isl_qpolynomial_cow(qp1);
1480
1481 if (!qp1 || !qp2)
1482 goto error;
1483
1484 if (qp1->div->n_row < qp2->div->n_row)
1485 return isl_qpolynomial_mul(qp2, qp1);
1486
1487 isl_assert(qp1->dim->ctx, isl_dim_equal(qp1->dim, qp2->dim), goto error);
1488 if (!compatible_divs(qp1->div, qp2->div))
1489 return with_merged_divs(isl_qpolynomial_mul, qp1, qp2);
1490
1491 qp1->upoly = isl_upoly_mul(qp1->upoly, isl_upoly_copy(qp2->upoly));
1492 if (!qp1->upoly)
1493 goto error;
1494
1495 isl_qpolynomial_free(qp2);
1496
1497 return qp1;
1498 error:
1499 isl_qpolynomial_free(qp1);
1500 isl_qpolynomial_free(qp2);
1501 return NULL;
1502 }
1503
1504 __isl_give isl_qpolynomial *isl_qpolynomial_pow(__isl_take isl_qpolynomial *qp,
1505 unsigned power)
1506 {
1507 qp = isl_qpolynomial_cow(qp);
1508
1509 if (!qp)
1510 return NULL;
1511
1512 qp->upoly = isl_upoly_pow(qp->upoly, power);
1513 if (!qp->upoly)
1514 goto error;
1515
1516 return qp;
1517 error:
1518 isl_qpolynomial_free(qp);
1519 return NULL;
1520 }
1521
1522 __isl_give isl_qpolynomial *isl_qpolynomial_zero(__isl_take isl_dim *dim)
1523 {
1524 return isl_qpolynomial_alloc(dim, 0, isl_upoly_zero(dim->ctx));
1525 }
1526
1527 __isl_give isl_qpolynomial *isl_qpolynomial_one(__isl_take isl_dim *dim)
1528 {
1529 return isl_qpolynomial_alloc(dim, 0, isl_upoly_one(dim->ctx));
1530 }
1531
1532 __isl_give isl_qpolynomial *isl_qpolynomial_infty(__isl_take isl_dim *dim)
1533 {
1534 return isl_qpolynomial_alloc(dim, 0, isl_upoly_infty(dim->ctx));
1535 }
1536
1537 __isl_give isl_qpolynomial *isl_qpolynomial_neginfty(__isl_take isl_dim *dim)
1538 {
1539 return isl_qpolynomial_alloc(dim, 0, isl_upoly_neginfty(dim->ctx));
1540 }
1541
1542 __isl_give isl_qpolynomial *isl_qpolynomial_nan(__isl_take isl_dim *dim)
1543 {
1544 return isl_qpolynomial_alloc(dim, 0, isl_upoly_nan(dim->ctx));
1545 }
1546
1547 __isl_give isl_qpolynomial *isl_qpolynomial_cst(__isl_take isl_dim *dim,
1548 isl_int v)
1549 {
1550 struct isl_qpolynomial *qp;
1551 struct isl_upoly_cst *cst;
1552
1553 qp = isl_qpolynomial_alloc(dim, 0, isl_upoly_zero(dim->ctx));
1554 if (!qp)
1555 return NULL;
1556
1557 cst = isl_upoly_as_cst(qp->upoly);
1558 isl_int_set(cst->n, v);
1559
1560 return qp;
1561 }
1562
1563 int isl_qpolynomial_is_cst(__isl_keep isl_qpolynomial *qp,
1564 isl_int *n, isl_int *d)
1565 {
1566 struct isl_upoly_cst *cst;
1567
1568 if (!qp)
1569 return -1;
1570
1571 if (!isl_upoly_is_cst(qp->upoly))
1572 return 0;
1573
1574 cst = isl_upoly_as_cst(qp->upoly);
1575 if (!cst)
1576 return -1;
1577
1578 if (n)
1579 isl_int_set(*n, cst->n);
1580 if (d)
1581 isl_int_set(*d, cst->d);
1582
1583 return 1;
1584 }
1585
1586 int isl_upoly_is_affine(__isl_keep struct isl_upoly *up)
1587 {
1588 int is_cst;
1589 struct isl_upoly_rec *rec;
1590
1591 if (!up)
1592 return -1;
1593
1594 if (up->var < 0)
1595 return 1;
1596
1597 rec = isl_upoly_as_rec(up);
1598 if (!rec)
1599 return -1;
1600
1601 if (rec->n > 2)
1602 return 0;
1603
1604 isl_assert(up->ctx, rec->n > 1, return -1);
1605
1606 is_cst = isl_upoly_is_cst(rec->p[1]);
1607 if (is_cst < 0)
1608 return -1;
1609 if (!is_cst)
1610 return 0;
1611
1612 return isl_upoly_is_affine(rec->p[0]);
1613 }
1614
1615 int isl_qpolynomial_is_affine(__isl_keep isl_qpolynomial *qp)
1616 {
1617 if (!qp)
1618 return -1;
1619
1620 if (qp->div->n_row > 0)
1621 return 0;
1622
1623 return isl_upoly_is_affine(qp->upoly);
1624 }
1625
1626 static void update_coeff(__isl_keep isl_vec *aff,
1627 __isl_keep struct isl_upoly_cst *cst, int pos)
1628 {
1629 isl_int gcd;
1630 isl_int f;
1631
1632 if (isl_int_is_zero(cst->n))
1633 return;
1634
1635 isl_int_init(gcd);
1636 isl_int_init(f);
1637 isl_int_gcd(gcd, cst->d, aff->el[0]);
1638 isl_int_divexact(f, cst->d, gcd);
1639 isl_int_divexact(gcd, aff->el[0], gcd);
1640 isl_seq_scale(aff->el, aff->el, f, aff->size);
1641 isl_int_mul(aff->el[1 + pos], gcd, cst->n);
1642 isl_int_clear(gcd);
1643 isl_int_clear(f);
1644 }
1645
1646 int isl_upoly_update_affine(__isl_keep struct isl_upoly *up,
1647 __isl_keep isl_vec *aff)
1648 {
1649 struct isl_upoly_cst *cst;
1650 struct isl_upoly_rec *rec;
1651
1652 if (!up || !aff)
1653 return -1;
1654
1655 if (up->var < 0) {
1656 struct isl_upoly_cst *cst;
1657
1658 cst = isl_upoly_as_cst(up);
1659 if (!cst)
1660 return -1;
1661 update_coeff(aff, cst, 0);
1662 return 0;
1663 }
1664
1665 rec = isl_upoly_as_rec(up);
1666 if (!rec)
1667 return -1;
1668 isl_assert(up->ctx, rec->n == 2, return -1);
1669
1670 cst = isl_upoly_as_cst(rec->p[1]);
1671 if (!cst)
1672 return -1;
1673 update_coeff(aff, cst, 1 + up->var);
1674
1675 return isl_upoly_update_affine(rec->p[0], aff);
1676 }
1677
1678 __isl_give isl_vec *isl_qpolynomial_extract_affine(
1679 __isl_keep isl_qpolynomial *qp)
1680 {
1681 isl_vec *aff;
1682 unsigned d;
1683
1684 if (!qp)
1685 return NULL;
1686
1687 isl_assert(qp->div->ctx, qp->div->n_row == 0, return NULL);
1688 d = isl_dim_total(qp->dim);
1689 aff = isl_vec_alloc(qp->div->ctx, 2 + d);
1690 if (!aff)
1691 return NULL;
1692
1693 isl_seq_clr(aff->el + 1, 1 + d);
1694 isl_int_set_si(aff->el[0], 1);
1695
1696 if (isl_upoly_update_affine(qp->upoly, aff) < 0)
1697 goto error;
1698
1699 return aff;
1700 error:
1701 isl_vec_free(aff);
1702 return NULL;
1703 }
1704
1705 int isl_qpolynomial_is_equal(__isl_keep isl_qpolynomial *qp1,
1706 __isl_keep isl_qpolynomial *qp2)
1707 {
1708 if (!qp1 || !qp2)
1709 return -1;
1710
1711 return isl_upoly_is_equal(qp1->upoly, qp2->upoly);
1712 }
1713
1714 static void upoly_update_den(__isl_keep struct isl_upoly *up, isl_int *d)
1715 {
1716 int i;
1717 struct isl_upoly_rec *rec;
1718
1719 if (isl_upoly_is_cst(up)) {
1720 struct isl_upoly_cst *cst;
1721 cst = isl_upoly_as_cst(up);
1722 if (!cst)
1723 return;
1724 isl_int_lcm(*d, *d, cst->d);
1725 return;
1726 }
1727
1728 rec = isl_upoly_as_rec(up);
1729 if (!rec)
1730 return;
1731
1732 for (i = 0; i < rec->n; ++i)
1733 upoly_update_den(rec->p[i], d);
1734 }
1735
1736 void isl_qpolynomial_get_den(__isl_keep isl_qpolynomial *qp, isl_int *d)
1737 {
1738 isl_int_set_si(*d, 1);
1739 if (!qp)
1740 return;
1741 upoly_update_den(qp->upoly, d);
1742 }
1743
1744 __isl_give isl_qpolynomial *isl_qpolynomial_var_pow(__isl_take isl_dim *dim,
1745 int pos, int power)
1746 {
1747 struct isl_ctx *ctx;
1748
1749 if (!dim)
1750 return NULL;
1751
1752 ctx = dim->ctx;
1753
1754 return isl_qpolynomial_alloc(dim, 0, isl_upoly_var_pow(ctx, pos, power));
1755 }
1756
1757 __isl_give isl_qpolynomial *isl_qpolynomial_var(__isl_take isl_dim *dim,
1758 enum isl_dim_type type, unsigned pos)
1759 {
1760 if (!dim)
1761 return NULL;
1762
1763 isl_assert(dim->ctx, isl_dim_size(dim, isl_dim_in) == 0, goto error);
1764 isl_assert(dim->ctx, pos < isl_dim_size(dim, type), goto error);
1765
1766 if (type == isl_dim_set)
1767 pos += isl_dim_size(dim, isl_dim_param);
1768
1769 return isl_qpolynomial_var_pow(dim, pos, 1);
1770 error:
1771 isl_dim_free(dim);
1772 return NULL;
1773 }
1774
1775 __isl_give struct isl_upoly *isl_upoly_subs(__isl_take struct isl_upoly *up,
1776 unsigned first, unsigned n, __isl_keep struct isl_upoly **subs)
1777 {
1778 int i;
1779 struct isl_upoly_rec *rec;
1780 struct isl_upoly *base, *res;
1781
1782 if (!up)
1783 return NULL;
1784
1785 if (isl_upoly_is_cst(up))
1786 return up;
1787
1788 if (up->var < first)
1789 return up;
1790
1791 rec = isl_upoly_as_rec(up);
1792 if (!rec)
1793 goto error;
1794
1795 isl_assert(up->ctx, rec->n >= 1, goto error);
1796
1797 if (up->var >= first + n)
1798 base = isl_upoly_var_pow(up->ctx, up->var, 1);
1799 else
1800 base = isl_upoly_copy(subs[up->var - first]);
1801
1802 res = isl_upoly_subs(isl_upoly_copy(rec->p[rec->n - 1]), first, n, subs);
1803 for (i = rec->n - 2; i >= 0; --i) {
1804 struct isl_upoly *t;
1805 t = isl_upoly_subs(isl_upoly_copy(rec->p[i]), first, n, subs);
1806 res = isl_upoly_mul(res, isl_upoly_copy(base));
1807 res = isl_upoly_sum(res, t);
1808 }
1809
1810 isl_upoly_free(base);
1811 isl_upoly_free(up);
1812
1813 return res;
1814 error:
1815 isl_upoly_free(up);
1816 return NULL;
1817 }
1818
1819 __isl_give struct isl_upoly *isl_upoly_from_affine(isl_ctx *ctx, isl_int *f,
1820 isl_int denom, unsigned len)
1821 {
1822 int i;
1823 struct isl_upoly *up;
1824
1825 isl_assert(ctx, len >= 1, return NULL);
1826
1827 up = isl_upoly_rat_cst(ctx, f[0], denom);
1828 for (i = 0; i < len - 1; ++i) {
1829 struct isl_upoly *t;
1830 struct isl_upoly *c;
1831
1832 if (isl_int_is_zero(f[1 + i]))
1833 continue;
1834
1835 c = isl_upoly_rat_cst(ctx, f[1 + i], denom);
1836 t = isl_upoly_var_pow(ctx, i, 1);
1837 t = isl_upoly_mul(c, t);
1838 up = isl_upoly_sum(up, t);
1839 }
1840
1841 return up;
1842 }
1843
1844 /* Remove common factor of non-constant terms and denominator.
1845 */
1846 static void normalize_div(__isl_keep isl_qpolynomial *qp, int div)
1847 {
1848 isl_ctx *ctx = qp->div->ctx;
1849 unsigned total = qp->div->n_col - 2;
1850
1851 isl_seq_gcd(qp->div->row[div] + 2, total, &ctx->normalize_gcd);
1852 isl_int_gcd(ctx->normalize_gcd,
1853 ctx->normalize_gcd, qp->div->row[div][0]);
1854 if (isl_int_is_one(ctx->normalize_gcd))
1855 return;
1856
1857 isl_seq_scale_down(qp->div->row[div] + 2, qp->div->row[div] + 2,
1858 ctx->normalize_gcd, total);
1859 isl_int_divexact(qp->div->row[div][0], qp->div->row[div][0],
1860 ctx->normalize_gcd);
1861 isl_int_fdiv_q(qp->div->row[div][1], qp->div->row[div][1],
1862 ctx->normalize_gcd);
1863 }
1864
1865 /* Replace the integer division identified by "div" by the polynomial "s".
1866 * The integer division is assumed not to appear in the definition
1867 * of any other integer divisions.
1868 */
1869 static __isl_give isl_qpolynomial *substitute_div(
1870 __isl_take isl_qpolynomial *qp,
1871 int div, __isl_take struct isl_upoly *s)
1872 {
1873 int i;
1874 int total;
1875 int *reordering;
1876
1877 if (!qp || !s)
1878 goto error;
1879
1880 qp = isl_qpolynomial_cow(qp);
1881 if (!qp)
1882 goto error;
1883
1884 total = isl_dim_total(qp->dim);
1885 qp->upoly = isl_upoly_subs(qp->upoly, total + div, 1, &s);
1886 if (!qp->upoly)
1887 goto error;
1888
1889 reordering = isl_alloc_array(qp->dim->ctx, int, total + qp->div->n_row);
1890 if (!reordering)
1891 goto error;
1892 for (i = 0; i < total + div; ++i)
1893 reordering[i] = i;
1894 for (i = total + div + 1; i < total + qp->div->n_row; ++i)
1895 reordering[i] = i - 1;
1896 qp->div = isl_mat_drop_rows(qp->div, div, 1);
1897 qp->div = isl_mat_drop_cols(qp->div, 2 + total + div, 1);
1898 qp->upoly = reorder(qp->upoly, reordering);
1899 free(reordering);
1900
1901 if (!qp->upoly || !qp->div)
1902 goto error;
1903
1904 isl_upoly_free(s);
1905 return qp;
1906 error:
1907 isl_qpolynomial_free(qp);
1908 isl_upoly_free(s);
1909 return NULL;
1910 }
1911
1912 /* Replace all integer divisions [e/d] that turn out to not actually be integer
1913 * divisions because d is equal to 1 by their definition, i.e., e.
1914 */
1915 static __isl_give isl_qpolynomial *substitute_non_divs(
1916 __isl_take isl_qpolynomial *qp)
1917 {
1918 int i, j;
1919 int total;
1920 struct isl_upoly *s;
1921
1922 if (!qp)
1923 return NULL;
1924
1925 total = isl_dim_total(qp->dim);
1926 for (i = 0; qp && i < qp->div->n_row; ++i) {
1927 if (!isl_int_is_one(qp->div->row[i][0]))
1928 continue;
1929 for (j = i + 1; j < qp->div->n_row; ++j) {
1930 if (isl_int_is_zero(qp->div->row[j][2 + total + i]))
1931 continue;
1932 isl_seq_combine(qp->div->row[j] + 1,
1933 qp->div->ctx->one, qp->div->row[j] + 1,
1934 qp->div->row[j][2 + total + i],
1935 qp->div->row[i] + 1, 1 + total + i);
1936 isl_int_set_si(qp->div->row[j][2 + total + i], 0);
1937 normalize_div(qp, j);
1938 }
1939 s = isl_upoly_from_affine(qp->dim->ctx, qp->div->row[i] + 1,
1940 qp->div->row[i][0], qp->div->n_col - 1);
1941 qp = substitute_div(qp, i, s);
1942 --i;
1943 }
1944
1945 return qp;
1946 }
1947
1948 /* Reduce the coefficients of div "div" to lie in the interval [0, d-1],
1949 * with d the denominator. When replacing the coefficient e of x by
1950 * d * frac(e/d) = e - d * floor(e/d), we are subtracting d * floor(e/d) * x
1951 * inside the division, so we need to add floor(e/d) * x outside.
1952 * That is, we replace q by q' + floor(e/d) * x and we therefore need
1953 * to adjust the coefficient of x in each later div that depends on the
1954 * current div "div" and also in the affine expression "aff"
1955 * (if it too depends on "div").
1956 */
1957 static void reduce_div(__isl_keep isl_qpolynomial *qp, int div,
1958 __isl_keep isl_vec *aff)
1959 {
1960 int i, j;
1961 isl_int v;
1962 unsigned total = qp->div->n_col - qp->div->n_row - 2;
1963
1964 isl_int_init(v);
1965 for (i = 0; i < 1 + total + div; ++i) {
1966 if (isl_int_is_nonneg(qp->div->row[div][1 + i]) &&
1967 isl_int_lt(qp->div->row[div][1 + i], qp->div->row[div][0]))
1968 continue;
1969 isl_int_fdiv_q(v, qp->div->row[div][1 + i], qp->div->row[div][0]);
1970 isl_int_fdiv_r(qp->div->row[div][1 + i],
1971 qp->div->row[div][1 + i], qp->div->row[div][0]);
1972 if (!isl_int_is_zero(aff->el[1 + total + div]))
1973 isl_int_addmul(aff->el[i], v, aff->el[1 + total + div]);
1974 for (j = div + 1; j < qp->div->n_row; ++j) {
1975 if (isl_int_is_zero(qp->div->row[j][2 + total + div]))
1976 continue;
1977 isl_int_addmul(qp->div->row[j][1 + i],
1978 v, qp->div->row[j][2 + total + div]);
1979 }
1980 }
1981 isl_int_clear(v);
1982 }
1983
1984 /* Check if the last non-zero coefficient is bigger that half of the
1985 * denominator. If so, we will invert the div to further reduce the number
1986 * of distinct divs that may appear.
1987 * If the last non-zero coefficient is exactly half the denominator,
1988 * then we continue looking for earlier coefficients that are bigger
1989 * than half the denominator.
1990 */
1991 static int needs_invert(__isl_keep isl_mat *div, int row)
1992 {
1993 int i;
1994 int cmp;
1995
1996 for (i = div->n_col - 1; i >= 1; --i) {
1997 if (isl_int_is_zero(div->row[row][i]))
1998 continue;
1999 isl_int_mul_ui(div->row[row][i], div->row[row][i], 2);
2000 cmp = isl_int_cmp(div->row[row][i], div->row[row][0]);
2001 isl_int_divexact_ui(div->row[row][i], div->row[row][i], 2);
2002 if (cmp)
2003 return cmp > 0;
2004 if (i == 1)
2005 return 1;
2006 }
2007
2008 return 0;
2009 }
2010
2011 /* Replace div "div" q = [e/d] by -[(-e+(d-1))/d].
2012 * We only invert the coefficients of e (and the coefficient of q in
2013 * later divs and in "aff"). After calling this function, the
2014 * coefficients of e should be reduced again.
2015 */
2016 static void invert_div(__isl_keep isl_qpolynomial *qp, int div,
2017 __isl_keep isl_vec *aff)
2018 {
2019 unsigned total = qp->div->n_col - qp->div->n_row - 2;
2020
2021 isl_seq_neg(qp->div->row[div] + 1,
2022 qp->div->row[div] + 1, qp->div->n_col - 1);
2023 isl_int_sub_ui(qp->div->row[div][1], qp->div->row[div][1], 1);
2024 isl_int_add(qp->div->row[div][1],
2025 qp->div->row[div][1], qp->div->row[div][0]);
2026 if (!isl_int_is_zero(aff->el[1 + total + div]))
2027 isl_int_neg(aff->el[1 + total + div], aff->el[1 + total + div]);
2028 isl_mat_col_mul(qp->div, 2 + total + div,
2029 qp->div->ctx->negone, 2 + total + div);
2030 }
2031
2032 /* Assuming "qp" is a monomial, reduce all its divs to have coefficients
2033 * in the interval [0, d-1], with d the denominator and such that the
2034 * last non-zero coefficient that is not equal to d/2 is smaller than d/2.
2035 *
2036 * After the reduction, some divs may have become redundant or identical,
2037 * so we call substitute_non_divs and sort_divs. If these functions
2038 * eliminate divs of merge * two or more divs into one, the coefficients
2039 * of the enclosing divs may have to be reduced again, so we call
2040 * ourselves recursively if the number of divs decreases.
2041 */
2042 static __isl_give isl_qpolynomial *reduce_divs(__isl_take isl_qpolynomial *qp)
2043 {
2044 int i, j;
2045 isl_vec *aff = NULL;
2046 struct isl_upoly *s;
2047 unsigned n_div;
2048
2049 if (!qp)
2050 return NULL;
2051
2052 aff = isl_vec_alloc(qp->div->ctx, qp->div->n_col - 1);
2053 aff = isl_vec_clr(aff);
2054 if (!aff)
2055 goto error;
2056
2057 isl_int_set_si(aff->el[1 + qp->upoly->var], 1);
2058
2059 for (i = 0; i < qp->div->n_row; ++i) {
2060 normalize_div(qp, i);
2061 reduce_div(qp, i, aff);
2062 if (needs_invert(qp->div, i)) {
2063 invert_div(qp, i, aff);
2064 reduce_div(qp, i, aff);
2065 }
2066 }
2067
2068 s = isl_upoly_from_affine(qp->div->ctx, aff->el,
2069 qp->div->ctx->one, aff->size);
2070 qp->upoly = isl_upoly_subs(qp->upoly, qp->upoly->var, 1, &s);
2071 isl_upoly_free(s);
2072 if (!qp->upoly)
2073 goto error;
2074
2075 isl_vec_free(aff);
2076
2077 n_div = qp->div->n_row;
2078 qp = substitute_non_divs(qp);
2079 qp = sort_divs(qp);
2080 if (qp && qp->div->n_row < n_div)
2081 return reduce_divs(qp);
2082
2083 return qp;
2084 error:
2085 isl_qpolynomial_free(qp);
2086 isl_vec_free(aff);
2087 return NULL;
2088 }
2089
2090 /* Assumes each div only depends on earlier divs.
2091 */
2092 __isl_give isl_qpolynomial *isl_qpolynomial_div_pow(__isl_take isl_div *div,
2093 int power)
2094 {
2095 struct isl_qpolynomial *qp = NULL;
2096 struct isl_upoly_rec *rec;
2097 struct isl_upoly_cst *cst;
2098 int i, d;
2099 int pos;
2100
2101 if (!div)
2102 return NULL;
2103
2104 d = div->line - div->bmap->div;
2105
2106 pos = isl_dim_total(div->bmap->dim) + d;
2107 rec = isl_upoly_alloc_rec(div->ctx, pos, 1 + power);
2108 qp = isl_qpolynomial_alloc(isl_basic_map_get_dim(div->bmap),
2109 div->bmap->n_div, &rec->up);
2110 if (!qp)
2111 goto error;
2112
2113 for (i = 0; i < div->bmap->n_div; ++i)
2114 isl_seq_cpy(qp->div->row[i], div->bmap->div[i], qp->div->n_col);
2115
2116 for (i = 0; i < 1 + power; ++i) {
2117 rec->p[i] = isl_upoly_zero(div->ctx);
2118 if (!rec->p[i])
2119 goto error;
2120 rec->n++;
2121 }
2122 cst = isl_upoly_as_cst(rec->p[power]);
2123 isl_int_set_si(cst->n, 1);
2124
2125 isl_div_free(div);
2126
2127 qp = reduce_divs(qp);
2128
2129 return qp;
2130 error:
2131 isl_qpolynomial_free(qp);
2132 isl_div_free(div);
2133 return NULL;
2134 }
2135
2136 __isl_give isl_qpolynomial *isl_qpolynomial_div(__isl_take isl_div *div)
2137 {
2138 return isl_qpolynomial_div_pow(div, 1);
2139 }
2140
2141 __isl_give isl_qpolynomial *isl_qpolynomial_rat_cst(__isl_take isl_dim *dim,
2142 const isl_int n, const isl_int d)
2143 {
2144 struct isl_qpolynomial *qp;
2145 struct isl_upoly_cst *cst;
2146
2147 qp = isl_qpolynomial_alloc(dim, 0, isl_upoly_zero(dim->ctx));
2148 if (!qp)
2149 return NULL;
2150
2151 cst = isl_upoly_as_cst(qp->upoly);
2152 isl_int_set(cst->n, n);
2153 isl_int_set(cst->d, d);
2154
2155 return qp;
2156 }
2157
2158 static int up_set_active(__isl_keep struct isl_upoly *up, int *active, int d)
2159 {
2160 struct isl_upoly_rec *rec;
2161 int i;
2162
2163 if (!up)
2164 return -1;
2165
2166 if (isl_upoly_is_cst(up))
2167 return 0;
2168
2169 if (up->var < d)
2170 active[up->var] = 1;
2171
2172 rec = isl_upoly_as_rec(up);
2173 for (i = 0; i < rec->n; ++i)
2174 if (up_set_active(rec->p[i], active, d) < 0)
2175 return -1;
2176
2177 return 0;
2178 }
2179
2180 static int set_active(__isl_keep isl_qpolynomial *qp, int *active)
2181 {
2182 int i, j;
2183 int d = isl_dim_total(qp->dim);
2184
2185 if (!qp || !active)
2186 return -1;
2187
2188 for (i = 0; i < d; ++i)
2189 for (j = 0; j < qp->div->n_row; ++j) {
2190 if (isl_int_is_zero(qp->div->row[j][2 + i]))
2191 continue;
2192 active[i] = 1;
2193 break;
2194 }
2195
2196 return up_set_active(qp->upoly, active, d);
2197 }
2198
2199 int isl_qpolynomial_involves_dims(__isl_keep isl_qpolynomial *qp,
2200 enum isl_dim_type type, unsigned first, unsigned n)
2201 {
2202 int i;
2203 int *active = NULL;
2204 int involves = 0;
2205
2206 if (!qp)
2207 return -1;
2208 if (n == 0)
2209 return 0;
2210
2211 isl_assert(qp->dim->ctx, first + n <= isl_dim_size(qp->dim, type),
2212 return -1);
2213 isl_assert(qp->dim->ctx, type == isl_dim_param ||
2214 type == isl_dim_set, return -1);
2215
2216 active = isl_calloc_array(set->ctx, int, isl_dim_total(qp->dim));
2217 if (set_active(qp, active) < 0)
2218 goto error;
2219
2220 if (type == isl_dim_set)
2221 first += isl_dim_size(qp->dim, isl_dim_param);
2222 for (i = 0; i < n; ++i)
2223 if (active[first + i]) {
2224 involves = 1;
2225 break;
2226 }
2227
2228 free(active);
2229
2230 return involves;
2231 error:
2232 free(active);
2233 return -1;
2234 }
2235
2236 __isl_give struct isl_upoly *isl_upoly_drop(__isl_take struct isl_upoly *up,
2237 unsigned first, unsigned n)
2238 {
2239 int i;
2240 struct isl_upoly_rec *rec;
2241
2242 if (!up)
2243 return NULL;
2244 if (n == 0 || up->var < 0 || up->var < first)
2245 return up;
2246 if (up->var < first + n) {
2247 up = replace_by_constant_term(up);
2248 return isl_upoly_drop(up, first, n);
2249 }
2250 up = isl_upoly_cow(up);
2251 if (!up)
2252 return NULL;
2253 up->var -= n;
2254 rec = isl_upoly_as_rec(up);
2255 if (!rec)
2256 goto error;
2257
2258 for (i = 0; i < rec->n; ++i) {
2259 rec->p[i] = isl_upoly_drop(rec->p[i], first, n);
2260 if (!rec->p[i])
2261 goto error;
2262 }
2263
2264 return up;
2265 error:
2266 isl_upoly_free(up);
2267 return NULL;
2268 }
2269
2270 __isl_give isl_qpolynomial *isl_qpolynomial_set_dim_name(
2271 __isl_take isl_qpolynomial *qp,
2272 enum isl_dim_type type, unsigned pos, const char *s)
2273 {
2274 qp = isl_qpolynomial_cow(qp);
2275 if (!qp)
2276 return NULL;
2277 qp->dim = isl_dim_set_name(qp->dim, type, pos, s);
2278 if (!qp->dim)
2279 goto error;
2280 return qp;
2281 error:
2282 isl_qpolynomial_free(qp);
2283 return NULL;
2284 }
2285
2286 __isl_give isl_qpolynomial *isl_qpolynomial_drop_dims(
2287 __isl_take isl_qpolynomial *qp,
2288 enum isl_dim_type type, unsigned first, unsigned n)
2289 {
2290 if (!qp)
2291 return NULL;
2292 if (n == 0 && !isl_dim_get_tuple_name(qp->dim, type))
2293 return qp;
2294
2295 qp = isl_qpolynomial_cow(qp);
2296 if (!qp)
2297 return NULL;
2298
2299 isl_assert(qp->dim->ctx, first + n <= isl_dim_size(qp->dim, type),
2300 goto error);
2301 isl_assert(qp->dim->ctx, type == isl_dim_param ||
2302 type == isl_dim_set, goto error);
2303
2304 qp->dim = isl_dim_drop(qp->dim, type, first, n);
2305 if (!qp->dim)
2306 goto error;
2307
2308 if (type == isl_dim_set)
2309 first += isl_dim_size(qp->dim, isl_dim_param);
2310
2311 qp->div = isl_mat_drop_cols(qp->div, 2 + first, n);
2312 if (!qp->div)
2313 goto error;
2314
2315 qp->upoly = isl_upoly_drop(qp->upoly, first, n);
2316 if (!qp->upoly)
2317 goto error;
2318
2319 return qp;
2320 error:
2321 isl_qpolynomial_free(qp);
2322 return NULL;
2323 }
2324
2325 __isl_give isl_qpolynomial *isl_qpolynomial_substitute_equalities(
2326 __isl_take isl_qpolynomial *qp, __isl_take isl_basic_set *eq)
2327 {
2328 int i, j, k;
2329 isl_int denom;
2330 unsigned total;
2331 unsigned n_div;
2332 struct isl_upoly *up;
2333
2334 if (!eq)
2335 goto error;
2336 if (eq->n_eq == 0) {
2337 isl_basic_set_free(eq);
2338 return qp;
2339 }
2340
2341 qp = isl_qpolynomial_cow(qp);
2342 if (!qp)
2343 goto error;
2344 qp->div = isl_mat_cow(qp->div);
2345 if (!qp->div)
2346 goto error;
2347
2348 total = 1 + isl_dim_total(eq->dim);
2349 n_div = eq->n_div;
2350 isl_int_init(denom);
2351 for (i = 0; i < eq->n_eq; ++i) {
2352 j = isl_seq_last_non_zero(eq->eq[i], total + n_div);
2353 if (j < 0 || j == 0 || j >= total)
2354 continue;
2355
2356 for (k = 0; k < qp->div->n_row; ++k) {
2357 if (isl_int_is_zero(qp->div->row[k][1 + j]))
2358 continue;
2359 isl_seq_elim(qp->div->row[k] + 1, eq->eq[i], j, total,
2360 &qp->div->row[k][0]);
2361 normalize_div(qp, k);
2362 }
2363
2364 if (isl_int_is_pos(eq->eq[i][j]))
2365 isl_seq_neg(eq->eq[i], eq->eq[i], total);
2366 isl_int_abs(denom, eq->eq[i][j]);
2367 isl_int_set_si(eq->eq[i][j], 0);
2368
2369 up = isl_upoly_from_affine(qp->dim->ctx,
2370 eq->eq[i], denom, total);
2371 qp->upoly = isl_upoly_subs(qp->upoly, j - 1, 1, &up);
2372 isl_upoly_free(up);
2373 }
2374 isl_int_clear(denom);
2375
2376 if (!qp->upoly)
2377 goto error;
2378
2379 isl_basic_set_free(eq);
2380
2381 qp = substitute_non_divs(qp);
2382 qp = sort_divs(qp);
2383
2384 return qp;
2385 error:
2386 isl_basic_set_free(eq);
2387 isl_qpolynomial_free(qp);
2388 return NULL;
2389 }
2390
2391 static __isl_give isl_basic_set *add_div_constraints(
2392 __isl_take isl_basic_set *bset, __isl_take isl_mat *div)
2393 {
2394 int i;
2395 unsigned total;
2396
2397 if (!bset || !div)
2398 goto error;
2399
2400 bset = isl_basic_set_extend_constraints(bset, 0, 2 * div->n_row);
2401 if (!bset)
2402 goto error;
2403 total = isl_basic_set_total_dim(bset);
2404 for (i = 0; i < div->n_row; ++i)
2405 if (isl_basic_set_add_div_constraints_var(bset,
2406 total - div->n_row + i, div->row[i]) < 0)
2407 goto error;
2408
2409 isl_mat_free(div);
2410 return bset;
2411 error:
2412 isl_mat_free(div);
2413 isl_basic_set_free(bset);
2414 return NULL;
2415 }
2416
2417 /* Look for equalities among the variables shared by context and qp
2418 * and the integer divisions of qp, if any.
2419 * The equalities are then used to eliminate variables and/or integer
2420 * divisions from qp.
2421 */
2422 __isl_give isl_qpolynomial *isl_qpolynomial_gist(
2423 __isl_take isl_qpolynomial *qp, __isl_take isl_set *context)
2424 {
2425 isl_basic_set *aff;
2426
2427 if (!qp)
2428 goto error;
2429 if (qp->div->n_row > 0) {
2430 isl_basic_set *bset;
2431 context = isl_set_add_dims(context, isl_dim_set,
2432 qp->div->n_row);
2433 bset = isl_basic_set_universe(isl_set_get_dim(context));
2434 bset = add_div_constraints(bset, isl_mat_copy(qp->div));
2435 context = isl_set_intersect(context,
2436 isl_set_from_basic_set(bset));
2437 }
2438
2439 aff = isl_set_affine_hull(context);
2440 return isl_qpolynomial_substitute_equalities(qp, aff);
2441 error:
2442 isl_qpolynomial_free(qp);
2443 isl_set_free(context);
2444 return NULL;
2445 }
2446
2447 #undef PW
2448 #define PW isl_pw_qpolynomial
2449 #undef EL
2450 #define EL isl_qpolynomial
2451 #undef IS_ZERO
2452 #define IS_ZERO is_zero
2453 #undef FIELD
2454 #define FIELD qp
2455
2456 #include <isl_pw_templ.c>
2457
2458 #undef UNION
2459 #define UNION isl_union_pw_qpolynomial
2460 #undef PART
2461 #define PART isl_pw_qpolynomial
2462 #undef PARTS
2463 #define PARTS pw_qpolynomial
2464
2465 #include <isl_union_templ.c>
2466
2467 int isl_pw_qpolynomial_is_one(__isl_keep isl_pw_qpolynomial *pwqp)
2468 {
2469 if (!pwqp)
2470 return -1;
2471
2472 if (pwqp->n != -1)
2473 return 0;
2474
2475 if (!isl_set_fast_is_universe(pwqp->p[0].set))
2476 return 0;
2477
2478 return isl_qpolynomial_is_one(pwqp->p[0].qp);
2479 }
2480
2481 __isl_give isl_pw_qpolynomial *isl_pw_qpolynomial_mul(
2482 __isl_take isl_pw_qpolynomial *pwqp1,
2483 __isl_take isl_pw_qpolynomial *pwqp2)
2484 {
2485 int i, j, n;
2486 struct isl_pw_qpolynomial *res;
2487 isl_set *set;
2488
2489 if (!pwqp1 || !pwqp2)
2490 goto error;
2491
2492 isl_assert(pwqp1->dim->ctx, isl_dim_equal(pwqp1->dim, pwqp2->dim),
2493 goto error);
2494
2495 if (isl_pw_qpolynomial_is_zero(pwqp1)) {
2496 isl_pw_qpolynomial_free(pwqp2);
2497 return pwqp1;
2498 }
2499
2500 if (isl_pw_qpolynomial_is_zero(pwqp2)) {
2501 isl_pw_qpolynomial_free(pwqp1);
2502 return pwqp2;
2503 }
2504
2505 if (isl_pw_qpolynomial_is_one(pwqp1)) {
2506 isl_pw_qpolynomial_free(pwqp1);
2507 return pwqp2;
2508 }
2509
2510 if (isl_pw_qpolynomial_is_one(pwqp2)) {
2511 isl_pw_qpolynomial_free(pwqp2);
2512 return pwqp1;
2513 }
2514
2515 n = pwqp1->n * pwqp2->n;
2516 res = isl_pw_qpolynomial_alloc_(isl_dim_copy(pwqp1->dim), n);
2517
2518 for (i = 0; i < pwqp1->n; ++i) {
2519 for (j = 0; j < pwqp2->n; ++j) {
2520 struct isl_set *common;
2521 struct isl_qpolynomial *prod;
2522 common = isl_set_intersect(isl_set_copy(pwqp1->p[i].set),
2523 isl_set_copy(pwqp2->p[j].set));
2524 if (isl_set_fast_is_empty(common)) {
2525 isl_set_free(common);
2526 continue;
2527 }
2528
2529 prod = isl_qpolynomial_mul(
2530 isl_qpolynomial_copy(pwqp1->p[i].qp),
2531 isl_qpolynomial_copy(pwqp2->p[j].qp));
2532
2533 res = isl_pw_qpolynomial_add_piece(res, common, prod);
2534 }
2535 }
2536
2537 isl_pw_qpolynomial_free(pwqp1);
2538 isl_pw_qpolynomial_free(pwqp2);
2539
2540 return res;
2541 error:
2542 isl_pw_qpolynomial_free(pwqp1);
2543 isl_pw_qpolynomial_free(pwqp2);
2544 return NULL;
2545 }
2546
2547 __isl_give isl_pw_qpolynomial *isl_pw_qpolynomial_neg(
2548 __isl_take isl_pw_qpolynomial *pwqp)
2549 {
2550 int i;
2551
2552 if (!pwqp)
2553 return NULL;
2554
2555 if (isl_pw_qpolynomial_is_zero(pwqp))
2556 return pwqp;
2557
2558 pwqp = isl_pw_qpolynomial_cow(pwqp);
2559 if (!pwqp)
2560 return NULL;
2561
2562 for (i = 0; i < pwqp->n; ++i) {
2563 pwqp->p[i].qp = isl_qpolynomial_neg(pwqp->p[i].qp);
2564 if (!pwqp->p[i].qp)
2565 goto error;
2566 }
2567
2568 return pwqp;
2569 error:
2570 isl_pw_qpolynomial_free(pwqp);
2571 return NULL;
2572 }
2573
2574 __isl_give isl_pw_qpolynomial *isl_pw_qpolynomial_sub(
2575 __isl_take isl_pw_qpolynomial *pwqp1,
2576 __isl_take isl_pw_qpolynomial *pwqp2)
2577 {
2578 return isl_pw_qpolynomial_add(pwqp1, isl_pw_qpolynomial_neg(pwqp2));
2579 }
2580
2581 __isl_give struct isl_upoly *isl_upoly_eval(
2582 __isl_take struct isl_upoly *up, __isl_take isl_vec *vec)
2583 {
2584 int i;
2585 struct isl_upoly_rec *rec;
2586 struct isl_upoly *res;
2587 struct isl_upoly *base;
2588
2589 if (isl_upoly_is_cst(up)) {
2590 isl_vec_free(vec);
2591 return up;
2592 }
2593
2594 rec = isl_upoly_as_rec(up);
2595 if (!rec)
2596 goto error;
2597
2598 isl_assert(up->ctx, rec->n >= 1, goto error);
2599
2600 base = isl_upoly_rat_cst(up->ctx, vec->el[1 + up->var], vec->el[0]);
2601
2602 res = isl_upoly_eval(isl_upoly_copy(rec->p[rec->n - 1]),
2603 isl_vec_copy(vec));
2604
2605 for (i = rec->n - 2; i >= 0; --i) {
2606 res = isl_upoly_mul(res, isl_upoly_copy(base));
2607 res = isl_upoly_sum(res,
2608 isl_upoly_eval(isl_upoly_copy(rec->p[i]),
2609 isl_vec_copy(vec)));
2610 }
2611
2612 isl_upoly_free(base);
2613 isl_upoly_free(up);
2614 isl_vec_free(vec);
2615 return res;
2616 error:
2617 isl_upoly_free(up);
2618 isl_vec_free(vec);
2619 return NULL;
2620 }
2621
2622 __isl_give isl_qpolynomial *isl_qpolynomial_eval(
2623 __isl_take isl_qpolynomial *qp, __isl_take isl_point *pnt)
2624 {
2625 isl_vec *ext;
2626 struct isl_upoly *up;
2627 isl_dim *dim;
2628
2629 if (!qp || !pnt)
2630 goto error;
2631 isl_assert(pnt->dim->ctx, isl_dim_equal(pnt->dim, qp->dim), goto error);
2632
2633 if (qp->div->n_row == 0)
2634 ext = isl_vec_copy(pnt->vec);
2635 else {
2636 int i;
2637 unsigned dim = isl_dim_total(qp->dim);
2638 ext = isl_vec_alloc(qp->dim->ctx, 1 + dim + qp->div->n_row);
2639 if (!ext)
2640 goto error;
2641
2642 isl_seq_cpy(ext->el, pnt->vec->el, pnt->vec->size);
2643 for (i = 0; i < qp->div->n_row; ++i) {
2644 isl_seq_inner_product(qp->div->row[i] + 1, ext->el,
2645 1 + dim + i, &ext->el[1+dim+i]);
2646 isl_int_fdiv_q(ext->el[1+dim+i], ext->el[1+dim+i],
2647 qp->div->row[i][0]);
2648 }
2649 }
2650
2651 up = isl_upoly_eval(isl_upoly_copy(qp->upoly), ext);
2652 if (!up)
2653 goto error;
2654
2655 dim = isl_dim_copy(qp->dim);
2656 isl_qpolynomial_free(qp);
2657 isl_point_free(pnt);
2658
2659 return isl_qpolynomial_alloc(dim, 0, up);
2660 error:
2661 isl_qpolynomial_free(qp);
2662 isl_point_free(pnt);
2663 return NULL;
2664 }
2665
2666 int isl_upoly_cmp(__isl_keep struct isl_upoly_cst *cst1,
2667 __isl_keep struct isl_upoly_cst *cst2)
2668 {
2669 int cmp;
2670 isl_int t;
2671 isl_int_init(t);
2672 isl_int_mul(t, cst1->n, cst2->d);
2673 isl_int_submul(t, cst2->n, cst1->d);
2674 cmp = isl_int_sgn(t);
2675 isl_int_clear(t);
2676 return cmp;
2677 }
2678
2679 int isl_qpolynomial_le_cst(__isl_keep isl_qpolynomial *qp1,
2680 __isl_keep isl_qpolynomial *qp2)
2681 {
2682 struct isl_upoly_cst *cst1, *cst2;
2683
2684 if (!qp1 || !qp2)
2685 return -1;
2686 isl_assert(qp1->dim->ctx, isl_upoly_is_cst(qp1->upoly), return -1);
2687 isl_assert(qp2->dim->ctx, isl_upoly_is_cst(qp2->upoly), return -1);
2688 if (isl_qpolynomial_is_nan(qp1))
2689 return -1;
2690 if (isl_qpolynomial_is_nan(qp2))
2691 return -1;
2692 cst1 = isl_upoly_as_cst(qp1->upoly);
2693 cst2 = isl_upoly_as_cst(qp2->upoly);
2694
2695 return isl_upoly_cmp(cst1, cst2) <= 0;
2696 }
2697
2698 __isl_give isl_qpolynomial *isl_qpolynomial_min_cst(
2699 __isl_take isl_qpolynomial *qp1, __isl_take isl_qpolynomial *qp2)
2700 {
2701 struct isl_upoly_cst *cst1, *cst2;
2702 int cmp;
2703
2704 if (!qp1 || !qp2)
2705 goto error;
2706 isl_assert(qp1->dim->ctx, isl_upoly_is_cst(qp1->upoly), goto error);
2707 isl_assert(qp2->dim->ctx, isl_upoly_is_cst(qp2->upoly), goto error);
2708 cst1 = isl_upoly_as_cst(qp1->upoly);
2709 cst2 = isl_upoly_as_cst(qp2->upoly);
2710 cmp = isl_upoly_cmp(cst1, cst2);
2711
2712 if (cmp <= 0) {
2713 isl_qpolynomial_free(qp2);
2714 } else {
2715 isl_qpolynomial_free(qp1);
2716 qp1 = qp2;
2717 }
2718 return qp1;
2719 error:
2720 isl_qpolynomial_free(qp1);
2721 isl_qpolynomial_free(qp2);
2722 return NULL;
2723 }
2724
2725 __isl_give isl_qpolynomial *isl_qpolynomial_max_cst(
2726 __isl_take isl_qpolynomial *qp1, __isl_take isl_qpolynomial *qp2)
2727 {
2728 struct isl_upoly_cst *cst1, *cst2;
2729 int cmp;
2730
2731 if (!qp1 || !qp2)
2732 goto error;
2733 isl_assert(qp1->dim->ctx, isl_upoly_is_cst(qp1->upoly), goto error);
2734 isl_assert(qp2->dim->ctx, isl_upoly_is_cst(qp2->upoly), goto error);
2735 cst1 = isl_upoly_as_cst(qp1->upoly);
2736 cst2 = isl_upoly_as_cst(qp2->upoly);
2737 cmp = isl_upoly_cmp(cst1, cst2);
2738
2739 if (cmp >= 0) {
2740 isl_qpolynomial_free(qp2);
2741 } else {
2742 isl_qpolynomial_free(qp1);
2743 qp1 = qp2;
2744 }
2745 return qp1;
2746 error:
2747 isl_qpolynomial_free(qp1);
2748 isl_qpolynomial_free(qp2);
2749 return NULL;
2750 }
2751
2752 __isl_give isl_qpolynomial *isl_qpolynomial_insert_dims(
2753 __isl_take isl_qpolynomial *qp, enum isl_dim_type type,
2754 unsigned first, unsigned n)
2755 {
2756 unsigned total;
2757 unsigned g_pos;
2758 int *exp;
2759
2760 if (n == 0)
2761 return qp;
2762
2763 qp = isl_qpolynomial_cow(qp);
2764 if (!qp)
2765 return NULL;
2766
2767 isl_assert(qp->div->ctx, first <= isl_dim_size(qp->dim, type),
2768 goto error);
2769
2770 g_pos = pos(qp->dim, type) + first;
2771
2772 qp->div = isl_mat_insert_cols(qp->div, 2 + g_pos, n);
2773 if (!qp->div)
2774 goto error;
2775
2776 total = qp->div->n_col - 2;
2777 if (total > g_pos) {
2778 int i;
2779 exp = isl_alloc_array(qp->div->ctx, int, total - g_pos);
2780 if (!exp)
2781 goto error;
2782 for (i = 0; i < total - g_pos; ++i)
2783 exp[i] = i + n;
2784 qp->upoly = expand(qp->upoly, exp, g_pos);
2785 free(exp);
2786 if (!qp->upoly)
2787 goto error;
2788 }
2789
2790 qp->dim = isl_dim_insert(qp->dim, type, first, n);
2791 if (!qp->dim)
2792 goto error;
2793
2794 return qp;
2795 error:
2796 isl_qpolynomial_free(qp);
2797 return NULL;
2798 }
2799
2800 __isl_give isl_qpolynomial *isl_qpolynomial_add_dims(
2801 __isl_take isl_qpolynomial *qp, enum isl_dim_type type, unsigned n)
2802 {
2803 unsigned pos;
2804
2805 pos = isl_qpolynomial_dim(qp, type);
2806
2807 return isl_qpolynomial_insert_dims(qp, type, pos, n);
2808 }
2809
2810 __isl_give isl_pw_qpolynomial *isl_pw_qpolynomial_add_dims(
2811 __isl_take isl_pw_qpolynomial *pwqp,
2812 enum isl_dim_type type, unsigned n)
2813 {
2814 unsigned pos;
2815
2816 pos = isl_pw_qpolynomial_dim(pwqp, type);
2817
2818 return isl_pw_qpolynomial_insert_dims(pwqp, type, pos, n);
2819 }
2820
2821 static int *reordering_move(isl_ctx *ctx,
2822 unsigned len, unsigned dst, unsigned src, unsigned n)
2823 {
2824 int i;
2825 int *reordering;
2826
2827 reordering = isl_alloc_array(ctx, int, len);
2828 if (!reordering)
2829 return NULL;
2830
2831 if (dst <= src) {
2832 for (i = 0; i < dst; ++i)
2833 reordering[i] = i;
2834 for (i = 0; i < n; ++i)
2835 reordering[src + i] = dst + i;
2836 for (i = 0; i < src - dst; ++i)
2837 reordering[dst + i] = dst + n + i;
2838 for (i = 0; i < len - src - n; ++i)
2839 reordering[src + n + i] = src + n + i;
2840 } else {
2841 for (i = 0; i < src; ++i)
2842 reordering[i] = i;
2843 for (i = 0; i < n; ++i)
2844 reordering[src + i] = dst + i;
2845 for (i = 0; i < dst - src; ++i)
2846 reordering[src + n + i] = src + i;
2847 for (i = 0; i < len - dst - n; ++i)
2848 reordering[dst + n + i] = dst + n + i;
2849 }
2850
2851 return reordering;
2852 }
2853
2854 __isl_give isl_qpolynomial *isl_qpolynomial_move_dims(
2855 __isl_take isl_qpolynomial *qp,
2856 enum isl_dim_type dst_type, unsigned dst_pos,
2857 enum isl_dim_type src_type, unsigned src_pos, unsigned n)
2858 {
2859 unsigned g_dst_pos;
2860 unsigned g_src_pos;
2861 int *reordering;
2862
2863 qp = isl_qpolynomial_cow(qp);
2864 if (!qp)
2865 return NULL;
2866
2867 isl_assert(qp->dim->ctx, src_pos + n <= isl_dim_size(qp->dim, src_type),
2868 goto error);
2869
2870 g_dst_pos = pos(qp->dim, dst_type) + dst_pos;
2871 g_src_pos = pos(qp->dim, src_type) + src_pos;
2872 if (dst_type > src_type)
2873 g_dst_pos -= n;
2874
2875 qp->div = isl_mat_move_cols(qp->div, 2 + g_dst_pos, 2 + g_src_pos, n);
2876 if (!qp->div)
2877 goto error;
2878 qp = sort_divs(qp);
2879 if (!qp)
2880 goto error;
2881
2882 reordering = reordering_move(qp->dim->ctx,
2883 qp->div->n_col - 2, g_dst_pos, g_src_pos, n);
2884 if (!reordering)
2885 goto error;
2886
2887 qp->upoly = reorder(qp->upoly, reordering);
2888 free(reordering);
2889 if (!qp->upoly)
2890 goto error;
2891
2892 qp->dim = isl_dim_move(qp->dim, dst_type, dst_pos, src_type, src_pos, n);
2893 if (!qp->dim)
2894 goto error;
2895
2896 return qp;
2897 error:
2898 isl_qpolynomial_free(qp);
2899 return NULL;
2900 }
2901
2902 __isl_give isl_qpolynomial *isl_qpolynomial_from_affine(__isl_take isl_dim *dim,
2903 isl_int *f, isl_int denom)
2904 {
2905 struct isl_upoly *up;
2906
2907 if (!dim)
2908 return NULL;
2909
2910 up = isl_upoly_from_affine(dim->ctx, f, denom, 1 + isl_dim_total(dim));
2911
2912 return isl_qpolynomial_alloc(dim, 0, up);
2913 }
2914
2915 __isl_give isl_qpolynomial *isl_qpolynomial_from_constraint(
2916 __isl_take isl_constraint *c, enum isl_dim_type type, unsigned pos)
2917 {
2918 isl_int denom;
2919 isl_dim *dim;
2920 struct isl_upoly *up;
2921 isl_qpolynomial *qp;
2922 int sgn;
2923
2924 if (!c)
2925 return NULL;
2926
2927 isl_int_init(denom);
2928
2929 isl_constraint_get_coefficient(c, type, pos, &denom);
2930 isl_constraint_set_coefficient(c, type, pos, c->ctx->zero);
2931 sgn = isl_int_sgn(denom);
2932 isl_int_abs(denom, denom);
2933 up = isl_upoly_from_affine(c->ctx, c->line[0], denom,
2934 1 + isl_constraint_dim(c, isl_dim_all));
2935 if (sgn < 0)
2936 isl_int_neg(denom, denom);
2937 isl_constraint_set_coefficient(c, type, pos, denom);
2938
2939 dim = isl_dim_copy(c->bmap->dim);
2940
2941 isl_int_clear(denom);
2942 isl_constraint_free(c);
2943
2944 qp = isl_qpolynomial_alloc(dim, 0, up);
2945 if (sgn > 0)
2946 qp = isl_qpolynomial_neg(qp);
2947 return qp;
2948 }
2949
2950 /* For each 0 <= i < "n", replace variable "first" + i of type "type"
2951 * in "qp" by subs[i].
2952 */
2953 __isl_give isl_qpolynomial *isl_qpolynomial_substitute(
2954 __isl_take isl_qpolynomial *qp,
2955 enum isl_dim_type type, unsigned first, unsigned n,
2956 __isl_keep isl_qpolynomial **subs)
2957 {
2958 int i;
2959 struct isl_upoly **ups;
2960
2961 if (n == 0)
2962 return qp;
2963
2964 qp = isl_qpolynomial_cow(qp);
2965 if (!qp)
2966 return NULL;
2967 for (i = 0; i < n; ++i)
2968 if (!subs[i])
2969 goto error;
2970
2971 isl_assert(qp->dim->ctx, first + n <= isl_dim_size(qp->dim, type),
2972 goto error);
2973
2974 for (i = 0; i < n; ++i)
2975 isl_assert(qp->dim->ctx, isl_dim_equal(qp->dim, subs[i]->dim),
2976 goto error);
2977
2978 isl_assert(qp->dim->ctx, qp->div->n_row == 0, goto error);
2979 for (i = 0; i < n; ++i)
2980 isl_assert(qp->dim->ctx, subs[i]->div->n_row == 0, goto error);
2981
2982 first += pos(qp->dim, type);
2983
2984 ups = isl_alloc_array(qp->dim->ctx, struct isl_upoly *, n);
2985 if (!ups)
2986 goto error;
2987 for (i = 0; i < n; ++i)
2988 ups[i] = subs[i]->upoly;
2989
2990 qp->upoly = isl_upoly_subs(qp->upoly, first, n, ups);
2991
2992 free(ups);
2993
2994 if (!qp->upoly)
2995 goto error;
2996
2997 return qp;
2998 error:
2999 isl_qpolynomial_free(qp);
3000 return NULL;
3001 }
3002
3003 /* Extend "bset" with extra set dimensions for each integer division
3004 * in "qp" and then call "fn" with the extended bset and the polynomial
3005 * that results from replacing each of the integer divisions by the
3006 * corresponding extra set dimension.
3007 */
3008 int isl_qpolynomial_as_polynomial_on_domain(__isl_keep isl_qpolynomial *qp,
3009 __isl_keep isl_basic_set *bset,
3010 int (*fn)(__isl_take isl_basic_set *bset,
3011 __isl_take isl_qpolynomial *poly, void *user), void *user)
3012 {
3013 isl_dim *dim;
3014 isl_mat *div;
3015 isl_qpolynomial *poly;
3016
3017 if (!qp || !bset)
3018 goto error;
3019 if (qp->div->n_row == 0)
3020 return fn(isl_basic_set_copy(bset), isl_qpolynomial_copy(qp),
3021 user);
3022
3023 div = isl_mat_copy(qp->div);
3024 dim = isl_dim_copy(qp->dim);
3025 dim = isl_dim_add(dim, isl_dim_set, qp->div->n_row);
3026 poly = isl_qpolynomial_alloc(dim, 0, isl_upoly_copy(qp->upoly));
3027 bset = isl_basic_set_copy(bset);
3028 bset = isl_basic_set_add(bset, isl_dim_set, qp->div->n_row);
3029 bset = add_div_constraints(bset, div);
3030
3031 return fn(bset, poly, user);
3032 error:
3033 return -1;
3034 }
3035
3036 /* Return total degree in variables first (inclusive) up to last (exclusive).
3037 */
3038 int isl_upoly_degree(__isl_keep struct isl_upoly *up, int first, int last)
3039 {
3040 int deg = -1;
3041 int i;
3042 struct isl_upoly_rec *rec;
3043
3044 if (!up)
3045 return -2;
3046 if (isl_upoly_is_zero(up))
3047 return -1;
3048 if (isl_upoly_is_cst(up) || up->var < first)
3049 return 0;
3050
3051 rec = isl_upoly_as_rec(up);
3052 if (!rec)
3053 return -2;
3054
3055 for (i = 0; i < rec->n; ++i) {
3056 int d;
3057
3058 if (isl_upoly_is_zero(rec->p[i]))
3059 continue;
3060 d = isl_upoly_degree(rec->p[i], first, last);
3061 if (up->var < last)
3062 d += i;
3063 if (d > deg)
3064 deg = d;
3065 }
3066
3067 return deg;
3068 }
3069
3070 /* Return total degree in set variables.
3071 */
3072 int isl_qpolynomial_degree(__isl_keep isl_qpolynomial *poly)
3073 {
3074 unsigned ovar;
3075 unsigned nvar;
3076
3077 if (!poly)
3078 return -2;
3079
3080 ovar = isl_dim_offset(poly->dim, isl_dim_set);
3081 nvar = isl_dim_size(poly->dim, isl_dim_set);
3082 return isl_upoly_degree(poly->upoly, ovar, ovar + nvar);
3083 }
3084
3085 __isl_give struct isl_upoly *isl_upoly_coeff(__isl_keep struct isl_upoly *up,
3086 unsigned pos, int deg)
3087 {
3088 int i;
3089 struct isl_upoly_rec *rec;
3090
3091 if (!up)
3092 return NULL;
3093
3094 if (isl_upoly_is_cst(up) || up->var < pos) {
3095 if (deg == 0)
3096 return isl_upoly_copy(up);
3097 else
3098 return isl_upoly_zero(up->ctx);
3099 }
3100
3101 rec = isl_upoly_as_rec(up);
3102 if (!rec)
3103 return NULL;
3104
3105 if (up->var == pos) {
3106 if (deg < rec->n)
3107 return isl_upoly_copy(rec->p[deg]);
3108 else
3109 return isl_upoly_zero(up->ctx);
3110 }
3111
3112 up = isl_upoly_copy(up);
3113 up = isl_upoly_cow(up);
3114 rec = isl_upoly_as_rec(up);
3115 if (!rec)
3116 goto error;
3117
3118 for (i = 0; i < rec->n; ++i) {
3119 struct isl_upoly *t;
3120 t = isl_upoly_coeff(rec->p[i], pos, deg);
3121 if (!t)
3122 goto error;
3123 isl_upoly_free(rec->p[i]);
3124 rec->p[i] = t;
3125 }
3126
3127 return up;
3128 error:
3129 isl_upoly_free(up);
3130 return NULL;
3131 }
3132
3133 /* Return coefficient of power "deg" of variable "t_pos" of type "type".
3134 */
3135 __isl_give isl_qpolynomial *isl_qpolynomial_coeff(
3136 __isl_keep isl_qpolynomial *qp,
3137 enum isl_dim_type type, unsigned t_pos, int deg)
3138 {
3139 unsigned g_pos;
3140 struct isl_upoly *up;
3141 isl_qpolynomial *c;
3142
3143 if (!qp)
3144 return NULL;
3145
3146 isl_assert(qp->div->ctx, t_pos < isl_dim_size(qp->dim, type),
3147 return NULL);
3148
3149 g_pos = pos(qp->dim, type) + t_pos;
3150 up = isl_upoly_coeff(qp->upoly, g_pos, deg);
3151
3152 c = isl_qpolynomial_alloc(isl_dim_copy(qp->dim), qp->div->n_row, up);
3153 if (!c)
3154 return NULL;
3155 isl_mat_free(c->div);
3156 c->div = isl_mat_copy(qp->div);
3157 if (!c->div)
3158 goto error;
3159 return c;
3160 error:
3161 isl_qpolynomial_free(c);
3162 return NULL;
3163 }
3164
3165 /* Homogenize the polynomial in the variables first (inclusive) up to
3166 * last (exclusive) by inserting powers of variable first.
3167 * Variable first is assumed not to appear in the input.
3168 */
3169 __isl_give struct isl_upoly *isl_upoly_homogenize(
3170 __isl_take struct isl_upoly *up, int deg, int target,
3171 int first, int last)
3172 {
3173 int i;
3174 struct isl_upoly_rec *rec;
3175
3176 if (!up)
3177 return NULL;
3178 if (isl_upoly_is_zero(up))
3179 return up;
3180 if (deg == target)
3181 return up;
3182 if (isl_upoly_is_cst(up) || up->var < first) {
3183 struct isl_upoly *hom;
3184
3185 hom = isl_upoly_var_pow(up->ctx, first, target - deg);
3186 if (!hom)
3187 goto error;
3188 rec = isl_upoly_as_rec(hom);
3189 rec->p[target - deg] = isl_upoly_mul(rec->p[target - deg], up);
3190
3191 return hom;
3192 }
3193
3194 up = isl_upoly_cow(up);
3195 rec = isl_upoly_as_rec(up);
3196 if (!rec)
3197 goto error;
3198
3199 for (i = 0; i < rec->n; ++i) {
3200 if (isl_upoly_is_zero(rec->p[i]))
3201 continue;
3202 rec->p[i] = isl_upoly_homogenize(rec->p[i],
3203 up->var < last ? deg + i : i, target,
3204 first, last);
3205 if (!rec->p[i])
3206 goto error;
3207 }
3208
3209 return up;
3210 error:
3211 isl_upoly_free(up);
3212 return NULL;
3213 }
3214
3215 /* Homogenize the polynomial in the set variables by introducing
3216 * powers of an extra set variable at position 0.
3217 */
3218 __isl_give isl_qpolynomial *isl_qpolynomial_homogenize(
3219 __isl_take isl_qpolynomial *poly)
3220 {
3221 unsigned ovar;
3222 unsigned nvar;
3223 int deg = isl_qpolynomial_degree(poly);
3224
3225 if (deg < -1)
3226 goto error;
3227
3228 poly = isl_qpolynomial_insert_dims(poly, isl_dim_set, 0, 1);
3229 poly = isl_qpolynomial_cow(poly);
3230 if (!poly)
3231 goto error;
3232
3233 ovar = isl_dim_offset(poly->dim, isl_dim_set);
3234 nvar = isl_dim_size(poly->dim, isl_dim_set);
3235 poly->upoly = isl_upoly_homogenize(poly->upoly, 0, deg,
3236 ovar, ovar + nvar);
3237 if (!poly->upoly)
3238 goto error;
3239
3240 return poly;
3241 error:
3242 isl_qpolynomial_free(poly);
3243 return NULL;
3244 }
3245
3246 __isl_give isl_term *isl_term_alloc(__isl_take isl_dim *dim,
3247 __isl_take isl_mat *div)
3248 {
3249 isl_term *term;
3250 int n;
3251
3252 if (!dim || !div)
3253 goto error;
3254
3255 n = isl_dim_total(dim) + div->n_row;
3256
3257 term = isl_calloc(dim->ctx, struct isl_term,
3258 sizeof(struct isl_term) + (n - 1) * sizeof(int));
3259 if (!term)
3260 goto error;
3261
3262 term->ref = 1;
3263 term->dim = dim;
3264 term->div = div;
3265 isl_int_init(term->n);
3266 isl_int_init(term->d);
3267
3268 return term;
3269 error:
3270 isl_dim_free(dim);
3271 isl_mat_free(div);
3272 return NULL;
3273 }
3274
3275 __isl_give isl_term *isl_term_copy(__isl_keep isl_term *term)
3276 {
3277 if (!term)
3278 return NULL;
3279
3280 term->ref++;
3281 return term;
3282 }
3283
3284 __isl_give isl_term *isl_term_dup(__isl_keep isl_term *term)
3285 {
3286 int i;
3287 isl_term *dup;
3288 unsigned total;
3289
3290 if (term)
3291 return NULL;
3292
3293 total = isl_dim_total(term->dim) + term->div->n_row;
3294
3295 dup = isl_term_alloc(isl_dim_copy(term->dim), isl_mat_copy(term->div));
3296 if (!dup)
3297 return NULL;
3298
3299 isl_int_set(dup->n, term->n);
3300 isl_int_set(dup->d, term->d);
3301
3302 for (i = 0; i < total; ++i)
3303 dup->pow[i] = term->pow[i];
3304
3305 return dup;
3306 }
3307
3308 __isl_give isl_term *isl_term_cow(__isl_take isl_term *term)
3309 {
3310 if (!term)
3311 return NULL;
3312
3313 if (term->ref == 1)
3314 return term;
3315 term->ref--;
3316 return isl_term_dup(term);
3317 }
3318
3319 void isl_term_free(__isl_take isl_term *term)
3320 {
3321 if (!term)
3322 return;
3323
3324 if (--term->ref > 0)
3325 return;
3326
3327 isl_dim_free(term->dim);
3328 isl_mat_free(term->div);
3329 isl_int_clear(term->n);
3330 isl_int_clear(term->d);
3331 free(term);
3332 }
3333
3334 unsigned isl_term_dim(__isl_keep isl_term *term, enum isl_dim_type type)
3335 {
3336 if (!term)
3337 return 0;
3338
3339 switch (type) {
3340 case isl_dim_param:
3341 case isl_dim_in:
3342 case isl_dim_out: return isl_dim_size(term->dim, type);
3343 case isl_dim_div: return term->div->n_row;
3344 case isl_dim_all: return isl_dim_total(term->dim) + term->div->n_row;
3345 default: return 0;
3346 }
3347 }
3348
3349 isl_ctx *isl_term_get_ctx(__isl_keep isl_term *term)
3350 {
3351 return term ? term->dim->ctx : NULL;
3352 }
3353
3354 void isl_term_get_num(__isl_keep isl_term *term, isl_int *n)
3355 {
3356 if (!term)
3357 return;
3358 isl_int_set(*n, term->n);
3359 }
3360
3361 void isl_term_get_den(__isl_keep isl_term *term, isl_int *d)
3362 {
3363 if (!term)
3364 return;
3365 isl_int_set(*d, term->d);
3366 }
3367
3368 int isl_term_get_exp(__isl_keep isl_term *term,
3369 enum isl_dim_type type, unsigned pos)
3370 {
3371 if (!term)
3372 return -1;
3373
3374 isl_assert(term->dim->ctx, pos < isl_term_dim(term, type), return -1);
3375
3376 if (type >= isl_dim_set)
3377 pos += isl_dim_size(term->dim, isl_dim_param);
3378 if (type >= isl_dim_div)
3379 pos += isl_dim_size(term->dim, isl_dim_set);
3380
3381 return term->pow[pos];
3382 }
3383
3384 __isl_give isl_div *isl_term_get_div(__isl_keep isl_term *term, unsigned pos)
3385 {
3386 isl_basic_map *bmap;
3387 unsigned total;
3388 int k;
3389
3390 if (!term)
3391 return NULL;
3392
3393 isl_assert(term->dim->ctx, pos < isl_term_dim(term, isl_dim_div),
3394 return NULL);
3395
3396 total = term->div->n_col - term->div->n_row - 2;
3397 /* No nested divs for now */
3398 isl_assert(term->dim->ctx,
3399 isl_seq_first_non_zero(term->div->row[pos] + 2 + total,
3400 term->div->n_row) == -1,
3401 return NULL);
3402
3403 bmap = isl_basic_map_alloc_dim(isl_dim_copy(term->dim), 1, 0, 0);
3404 if ((k = isl_basic_map_alloc_div(bmap)) < 0)
3405 goto error;
3406
3407 isl_seq_cpy(bmap->div[k], term->div->row[pos], 2 + total);
3408
3409 return isl_basic_map_div(bmap, k);
3410 error:
3411 isl_basic_map_free(bmap);
3412 return NULL;
3413 }
3414
3415 __isl_give isl_term *isl_upoly_foreach_term(__isl_keep struct isl_upoly *up,
3416 int (*fn)(__isl_take isl_term *term, void *user),
3417 __isl_take isl_term *term, void *user)
3418 {
3419 int i;
3420 struct isl_upoly_rec *rec;
3421
3422 if (!up || !term)
3423 goto error;
3424
3425 if (isl_upoly_is_zero(up))
3426 return term;
3427
3428 isl_assert(up->ctx, !isl_upoly_is_nan(up), goto error);
3429 isl_assert(up->ctx, !isl_upoly_is_infty(up), goto error);
3430 isl_assert(up->ctx, !isl_upoly_is_neginfty(up), goto error);
3431
3432 if (isl_upoly_is_cst(up)) {
3433 struct isl_upoly_cst *cst;
3434 cst = isl_upoly_as_cst(up);
3435 if (!cst)
3436 goto error;
3437 term = isl_term_cow(term);
3438 if (!term)
3439 goto error;
3440 isl_int_set(term->n, cst->n);
3441 isl_int_set(term->d, cst->d);
3442 if (fn(isl_term_copy(term), user) < 0)
3443 goto error;
3444 return term;
3445 }
3446
3447 rec = isl_upoly_as_rec(up);
3448 if (!rec)
3449 goto error;
3450
3451 for (i = 0; i < rec->n; ++i) {
3452 term = isl_term_cow(term);
3453 if (!term)
3454 goto error;
3455 term->pow[up->var] = i;
3456 term = isl_upoly_foreach_term(rec->p[i], fn, term, user);
3457 if (!term)
3458 goto error;
3459 }
3460 term->pow[up->var] = 0;
3461
3462 return term;
3463 error:
3464 isl_term_free(term);
3465 return NULL;
3466 }
3467
3468 int isl_qpolynomial_foreach_term(__isl_keep isl_qpolynomial *qp,
3469 int (*fn)(__isl_take isl_term *term, void *user), void *user)
3470 {
3471 isl_term *term;
3472
3473 if (!qp)
3474 return -1;
3475
3476 term = isl_term_alloc(isl_dim_copy(qp->dim), isl_mat_copy(qp->div));
3477 if (!term)
3478 return -1;
3479
3480 term = isl_upoly_foreach_term(qp->upoly, fn, term, user);
3481
3482 isl_term_free(term);
3483
3484 return term ? 0 : -1;
3485 }
3486
3487 __isl_give isl_qpolynomial *isl_qpolynomial_from_term(__isl_take isl_term *term)
3488 {
3489 struct isl_upoly *up;
3490 isl_qpolynomial *qp;
3491 int i, n;
3492
3493 if (!term)
3494 return NULL;
3495
3496 n = isl_dim_total(term->dim) + term->div->n_row;
3497
3498 up = isl_upoly_rat_cst(term->dim->ctx, term->n, term->d);
3499 for (i = 0; i < n; ++i) {
3500 if (!term->pow[i])
3501 continue;
3502 up = isl_upoly_mul(up,
3503 isl_upoly_var_pow(term->dim->ctx, i, term->pow[i]));
3504 }
3505
3506 qp = isl_qpolynomial_alloc(isl_dim_copy(term->dim), term->div->n_row, up);
3507 if (!qp)
3508 goto error;
3509 isl_mat_free(qp->div);
3510 qp->div = isl_mat_copy(term->div);
3511 if (!qp->div)
3512 goto error;
3513
3514 isl_term_free(term);
3515 return qp;
3516 error:
3517 isl_qpolynomial_free(qp);
3518 isl_term_free(term);
3519 return NULL;
3520 }
3521
3522 __isl_give isl_qpolynomial *isl_qpolynomial_lift(__isl_take isl_qpolynomial *qp,
3523 __isl_take isl_dim *dim)
3524 {
3525 int i;
3526 int extra;
3527 unsigned total;
3528
3529 if (!qp || !dim)
3530 goto error;
3531
3532 if (isl_dim_equal(qp->dim, dim)) {
3533 isl_dim_free(dim);
3534 return qp;
3535 }
3536
3537 qp = isl_qpolynomial_cow(qp);
3538 if (!qp)
3539 goto error;
3540
3541 extra = isl_dim_size(dim, isl_dim_set) -
3542 isl_dim_size(qp->dim, isl_dim_set);
3543 total = isl_dim_total(qp->dim);
3544 if (qp->div->n_row) {
3545 int *exp;
3546
3547 exp = isl_alloc_array(qp->div->ctx, int, qp->div->n_row);
3548 if (!exp)
3549 goto error;
3550 for (i = 0; i < qp->div->n_row; ++i)
3551 exp[i] = extra + i;
3552 qp->upoly = expand(qp->upoly, exp, total);
3553 free(exp);
3554 if (!qp->upoly)
3555 goto error;
3556 }
3557 qp->div = isl_mat_insert_cols(qp->div, 2 + total, extra);
3558 if (!qp->div)
3559 goto error;
3560 for (i = 0; i < qp->div->n_row; ++i)
3561 isl_seq_clr(qp->div->row[i] + 2 + total, extra);
3562
3563 isl_dim_free(qp->dim);
3564 qp->dim = dim;
3565
3566 return qp;
3567 error:
3568 isl_dim_free(dim);
3569 isl_qpolynomial_free(qp);
3570 return NULL;
3571 }
3572
3573 /* For each parameter or variable that does not appear in qp,
3574 * first eliminate the variable from all constraints and then set it to zero.
3575 */
3576 static __isl_give isl_set *fix_inactive(__isl_take isl_set *set,
3577 __isl_keep isl_qpolynomial *qp)
3578 {
3579 int *active = NULL;
3580 int i;
3581 int d;
3582 unsigned nparam;
3583 unsigned nvar;
3584
3585 if (!set || !qp)
3586 goto error;
3587
3588 d = isl_dim_total(set->dim);
3589 active = isl_calloc_array(set->ctx, int, d);
3590 if (set_active(qp, active) < 0)
3591 goto error;
3592
3593 for (i = 0; i < d; ++i)
3594 if (!active[i])
3595 break;
3596
3597 if (i == d) {
3598 free(active);
3599 return set;
3600 }
3601
3602 nparam = isl_dim_size(set->dim, isl_dim_param);
3603 nvar = isl_dim_size(set->dim, isl_dim_set);
3604 for (i = 0; i < nparam; ++i) {
3605 if (active[i])
3606 continue;
3607 set = isl_set_eliminate(set, isl_dim_param, i, 1);
3608 set = isl_set_fix_si(set, isl_dim_param, i, 0);
3609 }
3610 for (i = 0; i < nvar; ++i) {
3611 if (active[nparam + i])
3612 continue;
3613 set = isl_set_eliminate(set, isl_dim_set, i, 1);
3614 set = isl_set_fix_si(set, isl_dim_set, i, 0);
3615 }
3616
3617 free(active);
3618
3619 return set;
3620 error:
3621 free(active);
3622 isl_set_free(set);
3623 return NULL;
3624 }
3625
3626 struct isl_opt_data {
3627 isl_qpolynomial *qp;
3628 int first;
3629 isl_qpolynomial *opt;
3630 int max;
3631 };
3632
3633 static int opt_fn(__isl_take isl_point *pnt, void *user)
3634 {
3635 struct isl_opt_data *data = (struct isl_opt_data *)user;
3636 isl_qpolynomial *val;
3637
3638 val = isl_qpolynomial_eval(isl_qpolynomial_copy(data->qp), pnt);
3639 if (data->first) {
3640 data->first = 0;
3641 data->opt = val;
3642 } else if (data->max) {
3643 data->opt = isl_qpolynomial_max_cst(data->opt, val);
3644 } else {
3645 data->opt = isl_qpolynomial_min_cst(data->opt, val);
3646 }
3647
3648 return 0;
3649 }
3650
3651 __isl_give isl_qpolynomial *isl_qpolynomial_opt_on_domain(
3652 __isl_take isl_qpolynomial *qp, __isl_take isl_set *set, int max)
3653 {
3654 struct isl_opt_data data = { NULL, 1, NULL, max };
3655
3656 if (!set || !qp)
3657 goto error;
3658
3659 if (isl_upoly_is_cst(qp->upoly)) {
3660 isl_set_free(set);
3661 return qp;
3662 }
3663
3664 set = fix_inactive(set, qp);
3665
3666 data.qp = qp;
3667 if (isl_set_foreach_point(set, opt_fn, &data) < 0)
3668 goto error;
3669
3670 if (data.first)
3671 data.opt = isl_qpolynomial_zero(isl_qpolynomial_get_dim(qp));
3672
3673 isl_set_free(set);
3674 isl_qpolynomial_free(qp);
3675 return data.opt;
3676 error:
3677 isl_set_free(set);
3678 isl_qpolynomial_free(qp);
3679 isl_qpolynomial_free(data.opt);
3680 return NULL;
3681 }
3682
3683 __isl_give isl_qpolynomial *isl_qpolynomial_morph(__isl_take isl_qpolynomial *qp,
3684 __isl_take isl_morph *morph)
3685 {
3686 int i;
3687 int n_sub;
3688 isl_ctx *ctx;
3689 struct isl_upoly *up;
3690 unsigned n_div;
3691 struct isl_upoly **subs;
3692 isl_mat *mat;
3693
3694 qp = isl_qpolynomial_cow(qp);
3695 if (!qp || !morph)
3696 goto error;
3697
3698 ctx = qp->dim->ctx;
3699 isl_assert(ctx, isl_dim_equal(qp->dim, morph->dom->dim), goto error);
3700
3701 n_sub = morph->inv->n_row - 1;
3702 if (morph->inv->n_row != morph->inv->n_col)
3703 n_sub += qp->div->n_row;
3704 subs = isl_calloc_array(ctx, struct isl_upoly *, n_sub);
3705 if (!subs)
3706 goto error;
3707
3708 for (i = 0; 1 + i < morph->inv->n_row; ++i)
3709 subs[i] = isl_upoly_from_affine(ctx, morph->inv->row[1 + i],
3710 morph->inv->row[0][0], morph->inv->n_col);
3711 if (morph->inv->n_row != morph->inv->n_col)
3712 for (i = 0; i < qp->div->n_row; ++i)
3713 subs[morph->inv->n_row - 1 + i] =
3714 isl_upoly_var_pow(ctx, morph->inv->n_col - 1 + i, 1);
3715
3716 qp->upoly = isl_upoly_subs(qp->upoly, 0, n_sub, subs);
3717
3718 for (i = 0; i < n_sub; ++i)
3719 isl_upoly_free(subs[i]);
3720 free(subs);
3721
3722 mat = isl_mat_diagonal(isl_mat_identity(ctx, 1), isl_mat_copy(morph->inv));
3723 mat = isl_mat_diagonal(mat, isl_mat_identity(ctx, qp->div->n_row));
3724 qp->div = isl_mat_product(qp->div, mat);
3725 isl_dim_free(qp->dim);
3726 qp->dim = isl_dim_copy(morph->ran->dim);
3727
3728 if (!qp->upoly || !qp->div || !qp->dim)
3729 goto error;
3730
3731 isl_morph_free(morph);
3732
3733 return qp;
3734 error:
3735 isl_qpolynomial_free(qp);
3736 isl_morph_free(morph);
3737 return NULL;
3738 }
3739
3740 static int neg_entry(void **entry, void *user)
3741 {
3742 isl_pw_qpolynomial **pwqp = (isl_pw_qpolynomial **)entry;
3743
3744 *pwqp = isl_pw_qpolynomial_neg(*pwqp);
3745
3746 return *pwqp ? 0 : -1;
3747 }
3748
3749 __isl_give isl_union_pw_qpolynomial *isl_union_pw_qpolynomial_neg(
3750 __isl_take isl_union_pw_qpolynomial *upwqp)
3751 {
3752 upwqp = isl_union_pw_qpolynomial_cow(upwqp);
3753 if (!upwqp)
3754 return NULL;
3755
3756 if (isl_hash_table_foreach(upwqp->dim->ctx, &upwqp->table,
3757 &neg_entry, NULL) < 0)
3758 goto error;
3759
3760 return upwqp;
3761 error:
3762 isl_union_pw_qpolynomial_free(upwqp);
3763 return NULL;
3764 }
3765
3766 __isl_give isl_union_pw_qpolynomial *isl_union_pw_qpolynomial_sub(
3767 __isl_take isl_union_pw_qpolynomial *upwqp1,
3768 __isl_take isl_union_pw_qpolynomial *upwqp2)
3769 {
3770 return isl_union_pw_qpolynomial_add(upwqp1,
3771 isl_union_pw_qpolynomial_neg(upwqp2));
3772 }
3773
3774 static int mul_entry(void **entry, void *user)
3775 {
3776 struct isl_union_pw_qpolynomial_match_bin_data *data = user;
3777 uint32_t hash;
3778 struct isl_hash_table_entry *entry2;
3779 isl_pw_qpolynomial *pwpq = *entry;
3780 int empty;
3781
3782 hash = isl_dim_get_hash(pwpq->dim);
3783 entry2 = isl_hash_table_find(data->u2->dim->ctx, &data->u2->table,
3784 hash, &has_dim, pwpq->dim, 0);
3785 if (!entry2)
3786 return 0;
3787
3788 pwpq = isl_pw_qpolynomial_copy(pwpq);
3789 pwpq = isl_pw_qpolynomial_mul(pwpq,
3790 isl_pw_qpolynomial_copy(entry2->data));
3791
3792 empty = isl_pw_qpolynomial_is_zero(pwpq);
3793 if (empty < 0) {
3794 isl_pw_qpolynomial_free(pwpq);
3795 return -1;
3796 }
3797 if (empty) {
3798 isl_pw_qpolynomial_free(pwpq);
3799 return 0;
3800 }
3801
3802 data->res = isl_union_pw_qpolynomial_add_pw_qpolynomial(data->res, pwpq);
3803
3804 return 0;
3805 }
3806
3807 __isl_give isl_union_pw_qpolynomial *isl_union_pw_qpolynomial_mul(
3808 __isl_take isl_union_pw_qpolynomial *upwqp1,
3809 __isl_take isl_union_pw_qpolynomial *upwqp2)
3810 {
3811 return match_bin_op(upwqp1, upwqp2, &mul_entry);
3812 }
3813
3814 /* Reorder the columns of the given div definitions according to the
3815 * given reordering.
3816 */
3817 static __isl_give isl_mat *reorder_divs(__isl_take isl_mat *div,
3818 __isl_take isl_reordering *r)
3819 {
3820 int i, j;
3821 isl_mat *mat;
3822 int extra;
3823
3824 if (!div || !r)
3825 goto error;
3826
3827 extra = isl_dim_total(r->dim) + div->n_row - r->len;
3828 mat = isl_mat_alloc(div->ctx, div->n_row, div->n_col + extra);
3829 if (!mat)
3830 goto error;
3831
3832 for (i = 0; i < div->n_row; ++i) {
3833 isl_seq_cpy(mat->row[i], div->row[i], 2);
3834 isl_seq_clr(mat->row[i] + 2, mat->n_col - 2);
3835 for (j = 0; j < r->len; ++j)
3836 isl_int_set(mat->row[i][2 + r->pos[j]],
3837 div->row[i][2 + j]);
3838 }
3839
3840 isl_reordering_free(r);
3841 isl_mat_free(div);
3842 return mat;
3843 error:
3844 isl_reordering_free(r);
3845 isl_mat_free(div);
3846 return NULL;
3847 }
3848
3849 /* Reorder the dimension of "qp" according to the given reordering.
3850 */
3851 __isl_give isl_qpolynomial *isl_qpolynomial_realign(
3852 __isl_take isl_qpolynomial *qp, __isl_take isl_reordering *r)
3853 {
3854 qp = isl_qpolynomial_cow(qp);
3855 if (!qp)
3856 goto error;
3857
3858 r = isl_reordering_extend(r, qp->div->n_row);
3859 if (!r)
3860 goto error;
3861
3862 qp->div = reorder_divs(qp->div, isl_reordering_copy(r));
3863 if (!qp->div)
3864 goto error;
3865
3866 qp->upoly = reorder(qp->upoly, r->pos);
3867 if (!qp->upoly)
3868 goto error;
3869
3870 qp = isl_qpolynomial_reset_dim(qp, isl_dim_copy(r->dim));
3871
3872 isl_reordering_free(r);
3873 return qp;
3874 error:
3875 isl_qpolynomial_free(qp);
3876 isl_reordering_free(r);
3877 return NULL;
3878 }
3879
3880 struct isl_split_periods_data {
3881 int max_periods;
3882 isl_pw_qpolynomial *res;
3883 };
3884
3885 /* Create a slice where the integer division "div" has the fixed value "v".
3886 * In particular, if "div" refers to floor(f/m), then create a slice
3887 *
3888 * m v <= f <= m v + (m - 1)
3889 *
3890 * or
3891 *
3892 * f - m v >= 0
3893 * -f + m v + (m - 1) >= 0
3894 */
3895 static __isl_give isl_set *set_div_slice(__isl_take isl_dim *dim,
3896 __isl_keep isl_qpolynomial *qp, int div, isl_int v)
3897 {
3898 int total;
3899 isl_basic_set *bset = NULL;
3900 int k;
3901
3902 if (!dim || !qp)
3903 goto error;
3904
3905 total = isl_dim_total(dim);
3906 bset = isl_basic_set_alloc_dim(isl_dim_copy(dim), 0, 0, 2);
3907
3908 k = isl_basic_set_alloc_inequality(bset);
3909 if (k < 0)
3910 goto error;
3911 isl_seq_cpy(bset->ineq[k], qp->div->row[div] + 1, 1 + total);
3912 isl_int_submul(bset->ineq[k][0], v, qp->div->row[div][0]);
3913
3914 k = isl_basic_set_alloc_inequality(bset);
3915 if (k < 0)
3916 goto error;
3917 isl_seq_neg(bset->ineq[k], qp->div->row[div] + 1, 1 + total);
3918 isl_int_addmul(bset->ineq[k][0], v, qp->div->row[div][0]);
3919 isl_int_add(bset->ineq[k][0], bset->ineq[k][0], qp->div->row[div][0]);
3920 isl_int_sub_ui(bset->ineq[k][0], bset->ineq[k][0], 1);
3921
3922 isl_dim_free(dim);
3923 return isl_set_from_basic_set(bset);
3924 error:
3925 isl_basic_set_free(bset);
3926 isl_dim_free(dim);
3927 return NULL;
3928 }
3929
3930 static int split_periods(__isl_take isl_set *set,
3931 __isl_take isl_qpolynomial *qp, void *user);
3932
3933 /* Create a slice of the domain "set" such that integer division "div"
3934 * has the fixed value "v" and add the results to data->res,
3935 * replacing the integer division by "v" in "qp".
3936 */
3937 static int set_div(__isl_take isl_set *set,
3938 __isl_take isl_qpolynomial *qp, int div, isl_int v,
3939 struct isl_split_periods_data *data)
3940 {
3941 int i;
3942 int total;
3943 isl_set *slice;
3944 struct isl_upoly *cst;
3945
3946 slice = set_div_slice(isl_set_get_dim(set), qp, div, v);
3947 set = isl_set_intersect(set, slice);
3948
3949 if (!qp)
3950 goto error;
3951
3952 total = isl_dim_total(qp->dim);
3953
3954 for (i = div + 1; i < qp->div->n_row; ++i) {
3955 if (isl_int_is_zero(qp->div->row[i][2 + total + div]))
3956 continue;
3957 isl_int_addmul(qp->div->row[i][1],
3958 qp->div->row[i][2 + total + div], v);
3959 isl_int_set_si(qp->div->row[i][2 + total + div], 0);
3960 }
3961
3962 cst = isl_upoly_rat_cst(qp->dim->ctx, v, qp->dim->ctx->one);
3963 qp = substitute_div(qp, div, cst);
3964
3965 return split_periods(set, qp, data);
3966 error:
3967 isl_set_free(set);
3968 isl_qpolynomial_free(qp);
3969 return -1;
3970 }
3971
3972 /* Split the domain "set" such that integer division "div"
3973 * has a fixed value (ranging from "min" to "max") on each slice
3974 * and add the results to data->res.
3975 */
3976 static int split_div(__isl_take isl_set *set,
3977 __isl_take isl_qpolynomial *qp, int div, isl_int min, isl_int max,
3978 struct isl_split_periods_data *data)
3979 {
3980 for (; isl_int_le(min, max); isl_int_add_ui(min, min, 1)) {
3981 isl_set *set_i = isl_set_copy(set);
3982 isl_qpolynomial *qp_i = isl_qpolynomial_copy(qp);
3983
3984 if (set_div(set_i, qp_i, div, min, data) < 0)
3985 goto error;
3986 }
3987 isl_set_free(set);
3988 isl_qpolynomial_free(qp);
3989 return 0;
3990 error:
3991 isl_set_free(set);
3992 isl_qpolynomial_free(qp);
3993 return -1;
3994 }
3995
3996 /* If "qp" refers to any integer division
3997 * that can only attain "max_periods" distinct values on "set"
3998 * then split the domain along those distinct values.
3999 * Add the results (or the original if no splitting occurs)
4000 * to data->res.
4001 */
4002 static int split_periods(__isl_take isl_set *set,
4003 __isl_take isl_qpolynomial *qp, void *user)
4004 {
4005 int i;
4006 isl_pw_qpolynomial *pwqp;
4007 struct isl_split_periods_data *data;
4008 isl_int min, max;
4009 int total;
4010 int r = 0;
4011
4012 data = (struct isl_split_periods_data *)user;
4013
4014 if (!set || !qp)
4015 goto error;
4016
4017 if (qp->div->n_row == 0) {
4018 pwqp = isl_pw_qpolynomial_alloc(set, qp);
4019 data->res = isl_pw_qpolynomial_add_disjoint(data->res, pwqp);
4020 return 0;
4021 }
4022
4023 isl_int_init(min);
4024 isl_int_init(max);
4025 total = isl_dim_total(qp->dim);
4026 for (i = 0; i < qp->div->n_row; ++i) {
4027 enum isl_lp_result lp_res;
4028
4029 if (isl_seq_first_non_zero(qp->div->row[i] + 2 + total,
4030 qp->div->n_row) != -1)
4031 continue;
4032
4033 lp_res = isl_set_solve_lp(set, 0, qp->div->row[i] + 1,
4034 set->ctx->one, &min, NULL, NULL);
4035 if (lp_res == isl_lp_error)
4036 goto error2;
4037 if (lp_res == isl_lp_unbounded || lp_res == isl_lp_empty)
4038 continue;
4039 isl_int_fdiv_q(min, min, qp->div->row[i][0]);
4040
4041 lp_res = isl_set_solve_lp(set, 1, qp->div->row[i] + 1,
4042 set->ctx->one, &max, NULL, NULL);
4043 if (lp_res == isl_lp_error)
4044 goto error2;
4045 if (lp_res == isl_lp_unbounded || lp_res == isl_lp_empty)
4046 continue;
4047 isl_int_fdiv_q(max, max, qp->div->row[i][0]);
4048
4049 isl_int_sub(max, max, min);
4050 if (isl_int_cmp_si(max, data->max_periods) < 0) {
4051 isl_int_add(max, max, min);
4052 break;
4053 }
4054 }
4055
4056 if (i < qp->div->n_row) {
4057 r = split_div(set, qp, i, min, max, data);
4058 } else {
4059 pwqp = isl_pw_qpolynomial_alloc(set, qp);
4060 data->res = isl_pw_qpolynomial_add_disjoint(data->res, pwqp);
4061 }
4062
4063 isl_int_clear(max);
4064 isl_int_clear(min);
4065
4066 return r;
4067 error2:
4068 isl_int_clear(max);
4069 isl_int_clear(min);
4070 error:
4071 isl_set_free(set);
4072 isl_qpolynomial_free(qp);
4073 return -1;
4074 }
4075
4076 /* If any quasi-polynomial in pwqp refers to any integer division
4077 * that can only attain "max_periods" distinct values on its domain
4078 * then split the domain along those distinct values.
4079 */
4080 __isl_give isl_pw_qpolynomial *isl_pw_qpolynomial_split_periods(
4081 __isl_take isl_pw_qpolynomial *pwqp, int max_periods)
4082 {
4083 struct isl_split_periods_data data;
4084
4085 data.max_periods = max_periods;
4086 data.res = isl_pw_qpolynomial_zero(isl_pw_qpolynomial_get_dim(pwqp));
4087
4088 if (isl_pw_qpolynomial_foreach_piece(pwqp, &split_periods, &data) < 0)
4089 goto error;
4090
4091 isl_pw_qpolynomial_free(pwqp);
4092
4093 return data.res;
4094 error:
4095 isl_pw_qpolynomial_free(data.res);
4096 isl_pw_qpolynomial_free(pwqp);
4097 return NULL;
4098 }
4099
4100 /* Construct a piecewise quasipolynomial that is constant on the given
4101 * domain. In particular, it is
4102 * 0 if cst == 0
4103 * 1 if cst == 1
4104 * infinity if cst == -1
4105 */
4106 static __isl_give isl_pw_qpolynomial *constant_on_domain(
4107 __isl_take isl_basic_set *bset, int cst)
4108 {
4109 isl_dim *dim;
4110 isl_qpolynomial *qp;
4111
4112 if (!bset)
4113 return NULL;
4114
4115 bset = isl_basic_map_domain(isl_basic_map_from_range(bset));
4116 dim = isl_basic_set_get_dim(bset);
4117 if (cst < 0)
4118 qp = isl_qpolynomial_infty(dim);
4119 else if (cst == 0)
4120 qp = isl_qpolynomial_zero(dim);
4121 else
4122 qp = isl_qpolynomial_one(dim);
4123 return isl_pw_qpolynomial_alloc(isl_set_from_basic_set(bset), qp);
4124 }
4125
4126 /* Factor bset, call fn on each of the factors and return the product.
4127 *
4128 * If no factors can be found, simply call fn on the input.
4129 * Otherwise, construct the factors based on the factorizer,
4130 * call fn on each factor and compute the product.
4131 */
4132 static __isl_give isl_pw_qpolynomial *compressed_multiplicative_call(
4133 __isl_take isl_basic_set *bset,
4134 __isl_give isl_pw_qpolynomial *(*fn)(__isl_take isl_basic_set *bset))
4135 {
4136 int i, n;
4137 isl_dim *dim;
4138 isl_set *set;
4139 isl_factorizer *f;
4140 isl_qpolynomial *qp;
4141 isl_pw_qpolynomial *pwqp;
4142 unsigned nparam;
4143 unsigned nvar;
4144
4145 f = isl_basic_set_factorizer(bset);
4146 if (!f)
4147 goto error;
4148 if (f->n_group == 0) {
4149 isl_factorizer_free(f);
4150 return fn(bset);
4151 }
4152
4153 nparam = isl_basic_set_dim(bset, isl_dim_param);
4154 nvar = isl_basic_set_dim(bset, isl_dim_set);
4155
4156 dim = isl_basic_set_get_dim(bset);
4157 dim = isl_dim_domain(dim);
4158 set = isl_set_universe(isl_dim_copy(dim));
4159 qp = isl_qpolynomial_one(dim);
4160 pwqp = isl_pw_qpolynomial_alloc(set, qp);
4161
4162 bset = isl_morph_basic_set(isl_morph_copy(f->morph), bset);
4163
4164 for (i = 0, n = 0; i < f->n_group; ++i) {
4165 isl_basic_set *bset_i;
4166 isl_pw_qpolynomial *pwqp_i;
4167
4168 bset_i = isl_basic_set_copy(bset);
4169 bset_i = isl_basic_set_drop_constraints_involving(bset_i,
4170 nparam + n + f->len[i], nvar - n - f->len[i]);
4171 bset_i = isl_basic_set_drop_constraints_involving(bset_i,
4172 nparam, n);
4173 bset_i = isl_basic_set_drop(bset_i, isl_dim_set,
4174 n + f->len[i], nvar - n - f->len[i]);
4175 bset_i = isl_basic_set_drop(bset_i, isl_dim_set, 0, n);
4176
4177 pwqp_i = fn(bset_i);
4178 pwqp = isl_pw_qpolynomial_mul(pwqp, pwqp_i);
4179
4180 n += f->len[i];
4181 }
4182
4183 isl_basic_set_free(bset);
4184 isl_factorizer_free(f);
4185
4186 return pwqp;
4187 error:
4188 isl_basic_set_free(bset);
4189 return NULL;
4190 }
4191
4192 /* Factor bset, call fn on each of the factors and return the product.
4193 * The function is assumed to evaluate to zero on empty domains,
4194 * to one on zero-dimensional domains and to infinity on unbounded domains
4195 * and will not be called explicitly on zero-dimensional or unbounded domains.
4196 *
4197 * We first check for some special cases and remove all equalities.
4198 * Then we hand over control to compressed_multiplicative_call.
4199 */
4200 __isl_give isl_pw_qpolynomial *isl_basic_set_multiplicative_call(
4201 __isl_take isl_basic_set *bset,
4202 __isl_give isl_pw_qpolynomial *(*fn)(__isl_take isl_basic_set *bset))
4203 {
4204 int bounded;
4205 isl_morph *morph;
4206 isl_pw_qpolynomial *pwqp;
4207 unsigned orig_nvar, final_nvar;
4208
4209 if (!bset)
4210 return NULL;
4211
4212 if (isl_basic_set_fast_is_empty(bset))
4213 return constant_on_domain(bset, 0);
4214
4215 orig_nvar = isl_basic_set_dim(bset, isl_dim_set);
4216
4217 if (orig_nvar == 0)
4218 return constant_on_domain(bset, 1);
4219
4220 bounded = isl_basic_set_is_bounded(bset);
4221 if (bounded < 0)
4222 goto error;
4223 if (!bounded)
4224 return constant_on_domain(bset, -1);
4225
4226 if (bset->n_eq == 0)
4227 return compressed_multiplicative_call(bset, fn);
4228
4229 morph = isl_basic_set_full_compression(bset);
4230 bset = isl_morph_basic_set(isl_morph_copy(morph), bset);
4231
4232 final_nvar = isl_basic_set_dim(bset, isl_dim_set);
4233
4234 pwqp = compressed_multiplicative_call(bset, fn);
4235
4236 morph = isl_morph_remove_dom_dims(morph, isl_dim_set, 0, orig_nvar);
4237 morph = isl_morph_remove_ran_dims(morph, isl_dim_set, 0, final_nvar);
4238 morph = isl_morph_inverse(morph);
4239
4240 pwqp = isl_pw_qpolynomial_morph(pwqp, morph);
4241
4242 return pwqp;
4243 error:
4244 isl_basic_set_free(bset);
4245 return NULL;
4246 }
4247
4248 /* Drop all floors in "qp", turning each integer division [a/m] into
4249 * a rational division a/m. If "down" is set, then the integer division
4250 * is replaces by (a-(m-1))/m instead.
4251 */
4252 static __isl_give isl_qpolynomial *qp_drop_floors(
4253 __isl_take isl_qpolynomial *qp, int down)
4254 {
4255 int i;
4256 struct isl_upoly *s;
4257
4258 if (!qp)
4259 return NULL;
4260 if (qp->div->n_row == 0)
4261 return qp;
4262
4263 qp = isl_qpolynomial_cow(qp);
4264 if (!qp)
4265 return NULL;
4266
4267 for (i = qp->div->n_row - 1; i >= 0; --i) {
4268 if (down) {
4269 isl_int_sub(qp->div->row[i][1],
4270 qp->div->row[i][1], qp->div->row[i][0]);
4271 isl_int_add_ui(qp->div->row[i][1],
4272 qp->div->row[i][1], 1);
4273 }
4274 s = isl_upoly_from_affine(qp->dim->ctx, qp->div->row[i] + 1,
4275 qp->div->row[i][0], qp->div->n_col - 1);
4276 qp = substitute_div(qp, i, s);
4277 if (!qp)
4278 return NULL;
4279 }
4280
4281 return qp;
4282 }
4283
4284 /* Drop all floors in "pwqp", turning each integer division [a/m] into
4285 * a rational division a/m.
4286 */
4287 static __isl_give isl_pw_qpolynomial *pwqp_drop_floors(
4288 __isl_take isl_pw_qpolynomial *pwqp)
4289 {
4290 int i;
4291
4292 if (!pwqp)
4293 return NULL;
4294
4295 if (isl_pw_qpolynomial_is_zero(pwqp))
4296 return pwqp;
4297
4298 pwqp = isl_pw_qpolynomial_cow(pwqp);
4299 if (!pwqp)
4300 return NULL;
4301
4302 for (i = 0; i < pwqp->n; ++i) {
4303 pwqp->p[i].qp = qp_drop_floors(pwqp->p[i].qp, 0);
4304 if (!pwqp->p[i].qp)
4305 goto error;
4306 }
4307
4308 return pwqp;
4309 error:
4310 isl_pw_qpolynomial_free(pwqp);
4311 return NULL;
4312 }
4313
4314 /* Adjust all the integer divisions in "qp" such that they are at least
4315 * one over the given orthant (identified by "signs"). This ensures
4316 * that they will still be non-negative even after subtracting (m-1)/m.
4317 *
4318 * In particular, f is replaced by f' + v, changing f = [a/m]
4319 * to f' = [(a - m v)/m].
4320 * If the constant term k in a is smaller than m,
4321 * the constant term of v is set to floor(k/m) - 1.
4322 * For any other term, if the coefficient c and the variable x have
4323 * the same sign, then no changes are needed.
4324 * Otherwise, if the variable is positive (and c is negative),
4325 * then the coefficient of x in v is set to floor(c/m).
4326 * If the variable is negative (and c is positive),
4327 * then the coefficient of x in v is set to ceil(c/m).
4328 */
4329 static __isl_give isl_qpolynomial *make_divs_pos(__isl_take isl_qpolynomial *qp,
4330 int *signs)
4331 {
4332 int i, j;
4333 int total;
4334 isl_vec *v = NULL;
4335 struct isl_upoly *s;
4336
4337 qp = isl_qpolynomial_cow(qp);
4338 if (!qp)
4339 return NULL;
4340 qp->div = isl_mat_cow(qp->div);
4341 if (!qp->div)
4342 goto error;
4343
4344 total = isl_dim_total(qp->dim);
4345 v = isl_vec_alloc(qp->div->ctx, qp->div->n_col - 1);
4346
4347 for (i = 0; i < qp->div->n_row; ++i) {
4348 isl_int *row = qp->div->row[i];
4349 v = isl_vec_clr(v);
4350 if (!v)
4351 goto error;
4352 if (isl_int_lt(row[1], row[0])) {
4353 isl_int_fdiv_q(v->el[0], row[1], row[0]);
4354 isl_int_sub_ui(v->el[0], v->el[0], 1);
4355 isl_int_submul(row[1], row[0], v->el[0]);
4356 }
4357 for (j = 0; j < total; ++j) {
4358 if (isl_int_sgn(row[2 + j]) * signs[j] >= 0)
4359 continue;
4360 if (signs[j] < 0)
4361 isl_int_cdiv_q(v->el[1 + j], row[2 + j], row[0]);
4362 else
4363 isl_int_fdiv_q(v->el[1 + j], row[2 + j], row[0]);
4364 isl_int_submul(row[2 + j], row[0], v->el[1 + j]);
4365 }
4366 for (j = 0; j < i; ++j) {
4367 if (isl_int_sgn(row[2 + total + j]) >= 0)
4368 continue;
4369 isl_int_fdiv_q(v->el[1 + total + j],
4370 row[2 + total + j], row[0]);
4371 isl_int_submul(row[2 + total + j],
4372 row[0], v->el[1 + total + j]);
4373 }
4374 for (j = i + 1; j < qp->div->n_row; ++j) {
4375 if (isl_int_is_zero(qp->div->row[j][2 + total + i]))
4376 continue;
4377 isl_seq_combine(qp->div->row[j] + 1,
4378 qp->div->ctx->one, qp->div->row[j] + 1,
4379 qp->div->row[j][2 + total + i], v->el, v->size);
4380 }
4381 isl_int_set_si(v->el[1 + total + i], 1);
4382 s = isl_upoly_from_affine(qp->dim->ctx, v->el,
4383 qp->div->ctx->one, v->size);
4384 qp->upoly = isl_upoly_subs(qp->upoly, total + i, 1, &s);
4385 isl_upoly_free(s);
4386 if (!qp->upoly)
4387 goto error;
4388 }
4389
4390 isl_vec_free(v);
4391 return qp;
4392 error:
4393 isl_vec_free(v);
4394 isl_qpolynomial_free(qp);
4395 return NULL;
4396 }
4397
4398 struct isl_to_poly_data {
4399 int sign;
4400 isl_pw_qpolynomial *res;
4401 isl_qpolynomial *qp;
4402 };
4403
4404 /* Appoximate data->qp by a polynomial on the orthant identified by "signs".
4405 * We first make all integer divisions positive and then split the
4406 * quasipolynomials into terms with sign data->sign (the direction
4407 * of the requested approximation) and terms with the opposite sign.
4408 * In the first set of terms, each integer division [a/m] is
4409 * overapproximated by a/m, while in the second it is underapproximated
4410 * by (a-(m-1))/m.
4411 */
4412 static int to_polynomial_on_orthant(__isl_take isl_set *orthant, int *signs,
4413 void *user)
4414 {
4415 struct isl_to_poly_data *data = user;
4416 isl_pw_qpolynomial *t;
4417 isl_qpolynomial *qp, *up, *down;
4418
4419 qp = isl_qpolynomial_copy(data->qp);
4420 qp = make_divs_pos(qp, signs);
4421
4422 up = isl_qpolynomial_terms_of_sign(qp, signs, data->sign);
4423 up = qp_drop_floors(up, 0);
4424 down = isl_qpolynomial_terms_of_sign(qp, signs, -data->sign);
4425 down = qp_drop_floors(down, 1);
4426
4427 isl_qpolynomial_free(qp);
4428 qp = isl_qpolynomial_add(up, down);
4429
4430 t = isl_pw_qpolynomial_alloc(orthant, qp);
4431 data->res = isl_pw_qpolynomial_add_disjoint(data->res, t);
4432
4433 return 0;
4434 }
4435
4436 /* Approximate each quasipolynomial by a polynomial. If "sign" is positive,
4437 * the polynomial will be an overapproximation. If "sign" is negative,
4438 * it will be an underapproximation. If "sign" is zero, the approximation
4439 * will lie somewhere in between.
4440 *
4441 * In particular, is sign == 0, we simply drop the floors, turning
4442 * the integer divisions into rational divisions.
4443 * Otherwise, we split the domains into orthants, make all integer divisions
4444 * positive and then approximate each [a/m] by either a/m or (a-(m-1))/m,
4445 * depending on the requested sign and the sign of the term in which
4446 * the integer division appears.
4447 */
4448 __isl_give isl_pw_qpolynomial *isl_pw_qpolynomial_to_polynomial(
4449 __isl_take isl_pw_qpolynomial *pwqp, int sign)
4450 {
4451 int i;
4452 struct isl_to_poly_data data;
4453
4454 if (sign == 0)
4455 return pwqp_drop_floors(pwqp);
4456
4457 if (!pwqp)
4458 return NULL;
4459
4460 data.sign = sign;
4461 data.res = isl_pw_qpolynomial_zero(isl_pw_qpolynomial_get_dim(pwqp));
4462
4463 for (i = 0; i < pwqp->n; ++i) {
4464 if (pwqp->p[i].qp->div->n_row == 0) {
4465 isl_pw_qpolynomial *t;
4466 t = isl_pw_qpolynomial_alloc(
4467 isl_set_copy(pwqp->p[i].set),
4468 isl_qpolynomial_copy(pwqp->p[i].qp));
4469 data.res = isl_pw_qpolynomial_add_disjoint(data.res, t);
4470 continue;
4471 }
4472 data.qp = pwqp->p[i].qp;
4473 if (isl_set_foreach_orthant(pwqp->p[i].set,
4474 &to_polynomial_on_orthant, &data) < 0)
4475 goto error;
4476 }
4477
4478 isl_pw_qpolynomial_free(pwqp);
4479
4480 return data.res;
4481 error:
4482 isl_pw_qpolynomial_free(pwqp);
4483 isl_pw_qpolynomial_free(data.res);
4484 return NULL;
4485 }
4486
4487 static int poly_entry(void **entry, void *user)
4488 {
4489 int *sign = user;
4490 isl_pw_qpolynomial **pwqp = (isl_pw_qpolynomial **)entry;
4491
4492 *pwqp = isl_pw_qpolynomial_to_polynomial(*pwqp, *sign);
4493
4494 return *pwqp ? 0 : -1;
4495 }
4496
4497 __isl_give isl_union_pw_qpolynomial *isl_union_pw_qpolynomial_to_polynomial(
4498 __isl_take isl_union_pw_qpolynomial *upwqp, int sign)
4499 {
4500 upwqp = isl_union_pw_qpolynomial_cow(upwqp);
4501 if (!upwqp)
4502 return NULL;
4503
4504 if (isl_hash_table_foreach(upwqp->dim->ctx, &upwqp->table,
4505 &poly_entry, &sign) < 0)
4506 goto error;
4507
4508 return upwqp;
4509 error:
4510 isl_union_pw_qpolynomial_free(upwqp);
4511 return NULL;
4512 }
Integer set library