a56da74c7435feb3389ec342b7963ce3fa1146ec
[platform/upstream/isl.git] / isl_pw_templ.c
1 #define xFN(TYPE,NAME) TYPE ## _ ## NAME
2 #define FN(TYPE,NAME) xFN(TYPE,NAME)
3 #define xS(TYPE,NAME) struct TYPE ## _ ## NAME
4 #define S(TYPE,NAME) xS(TYPE,NAME)
5
6 #ifdef HAS_TYPE
7 static __isl_give PW *FN(PW,alloc_)(__isl_take isl_dim *dim,
8         enum isl_fold type, int n)
9 #else
10 static __isl_give PW *FN(PW,alloc_)(__isl_take isl_dim *dim, int n)
11 #endif
12 {
13         struct PW *pw;
14
15         if (!dim)
16                 return NULL;
17         isl_assert(dim->ctx, n >= 0, goto error);
18         pw = isl_alloc(dim->ctx, struct PW,
19                         sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
20         if (!pw)
21                 goto error;
22
23         pw->ref = 1;
24 #ifdef HAS_TYPE
25         pw->type = type;
26 #endif
27         pw->size = n;
28         pw->n = 0;
29         pw->dim = dim;
30         return pw;
31 error:
32         isl_dim_free(dim);
33         return NULL;
34 }
35
36 #ifdef HAS_TYPE
37 __isl_give PW *FN(PW,zero)(__isl_take isl_dim *dim, enum isl_fold type)
38 {
39         return FN(PW,alloc_)(dim, type, 0);
40 }
41 #else
42 __isl_give PW *FN(PW,zero)(__isl_take isl_dim *dim)
43 {
44         return FN(PW,alloc_)(dim, 0);
45 }
46 #endif
47
48 __isl_give PW *FN(PW,add_piece)(__isl_take PW *pw,
49         __isl_take isl_set *set, __isl_take EL *el)
50 {
51         if (!pw || !set || !el)
52                 goto error;
53
54         if (isl_set_fast_is_empty(set) || FN(EL,IS_ZERO)(el)) {
55                 isl_set_free(set);
56                 FN(EL,free)(el);
57                 return pw;
58         }
59
60 #ifdef HAS_TYPE
61         if (pw->type != el->type)
62                 isl_die(set->ctx, isl_error_invalid, "fold types don't match",
63                         goto error);
64 #endif
65         isl_assert(set->ctx, isl_dim_equal(pw->dim, el->dim), goto error);
66         isl_assert(set->ctx, pw->n < pw->size, goto error);
67
68         pw->p[pw->n].set = set;
69         pw->p[pw->n].FIELD = el;
70         pw->n++;
71         
72         return pw;
73 error:
74         FN(PW,free)(pw);
75         isl_set_free(set);
76         FN(EL,free)(el);
77         return NULL;
78 }
79
80 #ifdef HAS_TYPE
81 __isl_give PW *FN(PW,alloc)(enum isl_fold type,
82         __isl_take isl_set *set, __isl_take EL *el)
83 #else
84 __isl_give PW *FN(PW,alloc)(__isl_take isl_set *set, __isl_take EL *el)
85 #endif
86 {
87         PW *pw;
88
89         if (!set || !el)
90                 goto error;
91
92 #ifdef HAS_TYPE
93         pw = FN(PW,alloc_)(isl_set_get_dim(set), type, 1);
94 #else
95         pw = FN(PW,alloc_)(isl_set_get_dim(set), 1);
96 #endif
97
98         return FN(PW,add_piece)(pw, set, el);
99 error:
100         isl_set_free(set);
101         FN(EL,free)(el);
102         return NULL;
103 }
104
105 __isl_give PW *FN(PW,dup)(__isl_keep PW *pw)
106 {
107         int i;
108         PW *dup;
109
110         if (!pw)
111                 return NULL;
112
113 #ifdef HAS_TYPE
114         dup = FN(PW,alloc_)(isl_dim_copy(pw->dim), pw->type, pw->n);
115 #else
116         dup = FN(PW,alloc_)(isl_dim_copy(pw->dim), pw->n);
117 #endif
118         if (!dup)
119                 return NULL;
120
121         for (i = 0; i < pw->n; ++i)
122                 dup = FN(PW,add_piece)(dup, isl_set_copy(pw->p[i].set),
123                                             FN(EL,copy)(pw->p[i].FIELD));
124
125         return dup;
126 error:
127         FN(PW,free)(dup);
128         return NULL;
129 }
130
131 __isl_give PW *FN(PW,cow)(__isl_take PW *pw)
132 {
133         if (!pw)
134                 return NULL;
135
136         if (pw->ref == 1)
137                 return pw;
138         pw->ref--;
139         return FN(PW,dup)(pw);
140 }
141
142 __isl_give PW *FN(PW,copy)(__isl_keep PW *pw)
143 {
144         if (!pw)
145                 return NULL;
146
147         pw->ref++;
148         return pw;
149 }
150
151 void FN(PW,free)(__isl_take PW *pw)
152 {
153         int i;
154
155         if (!pw)
156                 return;
157         if (--pw->ref > 0)
158                 return;
159
160         for (i = 0; i < pw->n; ++i) {
161                 isl_set_free(pw->p[i].set);
162                 FN(EL,free)(pw->p[i].FIELD);
163         }
164         isl_dim_free(pw->dim);
165         free(pw);
166 }
167
168 int FN(PW,is_zero)(__isl_keep PW *pw)
169 {
170         if (!pw)
171                 return -1;
172
173         return pw->n == 0;
174 }
175
176 __isl_give PW *FN(PW,add)(__isl_take PW *pw1, __isl_take PW *pw2)
177 {
178         int i, j, n;
179         struct PW *res;
180         isl_set *set;
181
182         if (!pw1 || !pw2)
183                 goto error;
184
185 #ifdef HAS_TYPE
186         if (pw1->type != pw2->type)
187                 isl_die(pw1->dim->ctx, isl_error_invalid,
188                         "fold types don't match", goto error);
189 #endif
190         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
191
192         if (FN(PW,is_zero)(pw1)) {
193                 FN(PW,free)(pw1);
194                 return pw2;
195         }
196
197         if (FN(PW,is_zero)(pw2)) {
198                 FN(PW,free)(pw2);
199                 return pw1;
200         }
201
202         n = (pw1->n + 1) * (pw2->n + 1);
203 #ifdef HAS_TYPE
204         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->type, n);
205 #else
206         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), n);
207 #endif
208
209         for (i = 0; i < pw1->n; ++i) {
210                 set = isl_set_copy(pw1->p[i].set);
211                 for (j = 0; j < pw2->n; ++j) {
212                         struct isl_set *common;
213                         EL *sum;
214                         set = isl_set_subtract(set,
215                                         isl_set_copy(pw2->p[j].set));
216                         common = isl_set_intersect(isl_set_copy(pw1->p[i].set),
217                                                 isl_set_copy(pw2->p[j].set));
218                         if (isl_set_fast_is_empty(common)) {
219                                 isl_set_free(common);
220                                 continue;
221                         }
222
223                         sum = FN(EL,add_on_domain)(common,
224                                                    FN(EL,copy)(pw1->p[i].FIELD),
225                                                    FN(EL,copy)(pw2->p[j].FIELD));
226
227                         res = FN(PW,add_piece)(res, common, sum);
228                 }
229                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw1->p[i].FIELD));
230         }
231
232         for (j = 0; j < pw2->n; ++j) {
233                 set = isl_set_copy(pw2->p[j].set);
234                 for (i = 0; i < pw1->n; ++i)
235                         set = isl_set_subtract(set,
236                                         isl_set_copy(pw1->p[i].set));
237                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw2->p[j].FIELD));
238         }
239
240         FN(PW,free)(pw1);
241         FN(PW,free)(pw2);
242
243         return res;
244 error:
245         FN(PW,free)(pw1);
246         FN(PW,free)(pw2);
247         return NULL;
248 }
249
250 __isl_give PW *FN(PW,add_disjoint)(__isl_take PW *pw1, __isl_take PW *pw2)
251 {
252         int i;
253         PW *res;
254
255         if (!pw1 || !pw2)
256                 goto error;
257
258 #ifdef HAS_TYPE
259         if (pw1->type != pw2->type)
260                 isl_die(pw1->dim->ctx, isl_error_invalid,
261                         "fold types don't match", goto error);
262 #endif
263         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
264
265         if (FN(PW,is_zero)(pw1)) {
266                 FN(PW,free)(pw1);
267                 return pw2;
268         }
269
270         if (FN(PW,is_zero)(pw2)) {
271                 FN(PW,free)(pw2);
272                 return pw1;
273         }
274
275 #ifdef HAS_TYPE
276         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->type, pw1->n + pw2->n);
277 #else
278         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->n + pw2->n);
279 #endif
280
281         for (i = 0; i < pw1->n; ++i)
282                 res = FN(PW,add_piece)(res,
283                                 isl_set_copy(pw1->p[i].set),
284                                 FN(EL,copy)(pw1->p[i].FIELD));
285
286         for (i = 0; i < pw2->n; ++i)
287                 res = FN(PW,add_piece)(res,
288                                 isl_set_copy(pw2->p[i].set),
289                                 FN(EL,copy)(pw2->p[i].FIELD));
290
291         FN(PW,free)(pw1);
292         FN(PW,free)(pw2);
293
294         return res;
295 error:
296         FN(PW,free)(pw1);
297         FN(PW,free)(pw2);
298         return NULL;
299 }
300
301 __isl_give isl_qpolynomial *FN(PW,eval)(__isl_take PW *pw,
302         __isl_take isl_point *pnt)
303 {
304         int i;
305         int found = 0;
306         isl_qpolynomial *qp;
307
308         if (!pw || !pnt)
309                 goto error;
310         isl_assert(pnt->dim->ctx, isl_dim_equal(pnt->dim, pw->dim), goto error);
311
312         for (i = 0; i < pw->n; ++i) {
313                 found = isl_set_contains_point(pw->p[i].set, pnt);
314                 if (found < 0)
315                         goto error;
316                 if (found)
317                         break;
318         }
319         if (found)
320                 qp = FN(EL,eval)(FN(EL,copy)(pw->p[i].FIELD),
321                                             isl_point_copy(pnt));
322         else
323                 qp = isl_qpolynomial_zero(isl_dim_copy(pw->dim));
324         FN(PW,free)(pw);
325         isl_point_free(pnt);
326         return qp;
327 error:
328         FN(PW,free)(pw);
329         isl_point_free(pnt);
330         return NULL;
331 }
332
333 __isl_give isl_set *FN(PW,domain)(__isl_take PW *pw)
334 {
335         int i;
336         isl_set *dom;
337
338         if (!pw)
339                 return NULL;
340
341         dom = isl_set_empty(isl_dim_copy(pw->dim));
342         for (i = 0; i < pw->n; ++i)
343                 dom = isl_set_union_disjoint(dom, isl_set_copy(pw->p[i].set));
344
345         FN(PW,free)(pw);
346
347         return dom;
348 }
349
350 __isl_give PW *FN(PW,intersect_domain)(__isl_take PW *pw, __isl_take isl_set *set)
351 {
352         int i;
353
354         if (!pw || !set)
355                 goto error;
356
357         if (pw->n == 0) {
358                 isl_set_free(set);
359                 return pw;
360         }
361
362         pw = FN(PW,cow)(pw);
363         if (!pw)
364                 goto error;
365
366         for (i = pw->n - 1; i >= 0; --i) {
367                 isl_basic_set *aff;
368                 pw->p[i].set = isl_set_intersect(pw->p[i].set, isl_set_copy(set));
369                 if (!pw->p[i].set)
370                         goto error;
371                 aff = isl_set_affine_hull(isl_set_copy(pw->p[i].set));
372                 pw->p[i].FIELD = FN(EL,substitute_equalities)(pw->p[i].FIELD,
373                                                                 aff);
374                 if (isl_set_fast_is_empty(pw->p[i].set)) {
375                         isl_set_free(pw->p[i].set);
376                         FN(EL,free)(pw->p[i].FIELD);
377                         if (i != pw->n - 1)
378                                 pw->p[i] = pw->p[pw->n - 1];
379                         pw->n--;
380                 }
381         }
382         
383         isl_set_free(set);
384         return pw;
385 error:
386         isl_set_free(set);
387         FN(PW,free)(pw);
388         return NULL;
389 }
390
391 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
392 {
393         int i;
394         isl_basic_set *hull = NULL;
395
396         if (!pw || !context)
397                 goto error;
398
399         if (pw->n == 0) {
400                 isl_set_free(context);
401                 return pw;
402         }
403
404         hull = isl_set_simple_hull(isl_set_copy(context));
405
406         pw = FN(PW,cow)(pw);
407         if (!pw)
408                 goto error;
409
410         for (i = 0; i < pw->n; ++i) {
411                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
412                                                 isl_basic_set_copy(hull));
413                 if (!pw->p[i].set)
414                         goto error;
415         }
416
417         isl_basic_set_free(hull);
418         isl_set_free(context);
419
420         return pw;
421 error:
422         FN(PW,free)(pw);
423         isl_basic_set_free(hull);
424         isl_set_free(context);
425         return NULL;
426 }
427
428 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
429 {
430         int i, j;
431
432         if (!pw)
433                 return NULL;
434         if (pw->n == 0)
435                 return pw;
436
437         for (i = pw->n - 1; i >= 0; --i) {
438                 for (j = i - 1; j >= 0; --j) {
439                         if (!FN(EL,is_equal)(pw->p[i].FIELD, pw->p[j].FIELD))
440                                 continue;
441                         pw->p[j].set = isl_set_union(pw->p[j].set,
442                                                         pw->p[i].set);
443                         FN(EL,free)(pw->p[i].FIELD);
444                         if (i != pw->n - 1)
445                                 pw->p[i] = pw->p[pw->n - 1];
446                         pw->n--;
447                         break;
448                 }
449                 if (j >= 0)
450                         continue;
451                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
452                 if (!pw->p[i].set)
453                         goto error;
454         }
455
456         return pw;
457 error:
458         FN(PW,free)(pw);
459         return NULL;
460 }
461
462 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
463 {
464         return pw ? pw->dim->ctx : NULL;
465 }
466
467 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
468         unsigned first, unsigned n)
469 {
470         int i;
471
472         if (!pw)
473                 return -1;
474         if (pw->n == 0 || n == 0)
475                 return 0;
476         for (i = 0; i < pw->n; ++i) {
477                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
478                                                         type, first, n);
479                 if (involves < 0 || involves)
480                         return involves;
481         }
482         return 0;
483 }
484
485 __isl_give PW *FN(PW,set_dim_name)(__isl_take PW *pw,
486         enum isl_dim_type type, unsigned pos, const char *s)
487 {
488         int i;
489
490         pw = FN(PW,cow)(pw);
491         if (!pw)
492                 return NULL;
493
494         pw->dim = isl_dim_set_name(pw->dim, type, pos, s);
495         if (!pw->dim)
496                 goto error;
497
498         for (i = 0; i < pw->n; ++i) {
499                 pw->p[i].set = isl_set_set_dim_name(pw->p[i].set, type, pos, s);
500                 if (!pw->p[i].set)
501                         goto error;
502                 pw->p[i].FIELD = FN(EL,set_dim_name)(pw->p[i].FIELD, type, pos, s);
503                 if (!pw->p[i].FIELD)
504                         goto error;
505         }
506
507         return pw;
508 error:
509         FN(PW,free)(pw);
510         return NULL;
511 }
512
513 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
514         enum isl_dim_type type, unsigned first, unsigned n)
515 {
516         int i;
517
518         if (!pw)
519                 return NULL;
520         if (n == 0 && !isl_dim_get_tuple_name(pw->dim, type))
521                 return pw;
522
523         pw = FN(PW,cow)(pw);
524         if (!pw)
525                 return NULL;
526         pw->dim = isl_dim_drop(pw->dim, type, first, n);
527         if (!pw->dim)
528                 goto error;
529         for (i = 0; i < pw->n; ++i) {
530                 pw->p[i].set = isl_set_drop(pw->p[i].set, type, first, n);
531                 if (!pw->p[i].set)
532                         goto error;
533                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
534                 if (!pw->p[i].FIELD)
535                         goto error;
536         }
537
538         return pw;
539 error:
540         FN(PW,free)(pw);
541         return NULL;
542 }
543
544 __isl_give PW *FN(PW,insert_dims)(__isl_take PW *pw, enum isl_dim_type type,
545         unsigned first, unsigned n)
546 {
547         int i;
548
549         if (!pw)
550                 return NULL;
551         if (n == 0 && !isl_dim_is_named_or_nested(pw->dim, type))
552                 return pw;
553
554         pw = FN(PW,cow)(pw);
555         if (!pw)
556                 return NULL;
557
558         pw->dim = isl_dim_insert(pw->dim, type, first, n);
559         if (!pw->dim)
560                 goto error;
561
562         for (i = 0; i < pw->n; ++i) {
563                 pw->p[i].set = isl_set_insert(pw->p[i].set, type, first, n);
564                 if (!pw->p[i].set)
565                         goto error;
566                 pw->p[i].FIELD = FN(EL,insert_dims)(pw->p[i].FIELD,
567                                                                 type, first, n);
568                 if (!pw->p[i].FIELD)
569                         goto error;
570         }
571
572         return pw;
573 error:
574         FN(PW,free)(pw);
575         return NULL;
576 }
577
578 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
579         enum isl_dim_type type, unsigned pos, isl_int v)
580 {
581         int i;
582
583         if (!pw)
584                 return NULL;
585
586         pw = FN(PW,cow)(pw);
587         if (!pw)
588                 return NULL;
589         for (i = 0; i < pw->n; ++i) {
590                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
591                 if (!pw->p[i].set)
592                         goto error;
593         }
594
595         return pw;
596 error:
597         FN(PW,free)(pw);
598         return NULL;
599 }
600
601 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
602 {
603         return pw ? isl_dim_size(pw->dim, type) : 0;
604 }
605
606 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
607         enum isl_dim_type type, unsigned first, unsigned n)
608 {
609         int i;
610
611         if (!pw)
612                 return NULL;
613         if (n == 0)
614                 return pw;
615
616         pw = FN(PW,cow)(pw);
617         if (!pw)
618                 return NULL;
619         if (!pw->dim)
620                 goto error;
621         for (i = 0; i < pw->n; ++i) {
622                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
623                 if (!pw->p[i].set)
624                         goto error;
625         }
626
627         return pw;
628 error:
629         FN(PW,free)(pw);
630         return NULL;
631 }
632
633 /* Compute the maximal value attained by the piecewise quasipolynomial
634  * on its domain or zero if the domain is empty.
635  * In the worst case, the domain is scanned completely,
636  * so the domain is assumed to be bounded.
637  */
638 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
639 {
640         int i;
641         isl_qpolynomial *opt;
642
643         if (!pw)
644                 return NULL;
645
646         if (pw->n == 0) {
647                 isl_dim *dim = isl_dim_copy(pw->dim);
648                 FN(PW,free)(pw);
649                 return isl_qpolynomial_zero(dim);
650         }
651
652         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
653                                         isl_set_copy(pw->p[0].set), max);
654         for (i = 1; i < pw->n; ++i) {
655                 isl_qpolynomial *opt_i;
656                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
657                                                 isl_set_copy(pw->p[i].set), max);
658                 if (max)
659                         opt = isl_qpolynomial_max_cst(opt, opt_i);
660                 else
661                         opt = isl_qpolynomial_min_cst(opt, opt_i);
662         }
663
664         FN(PW,free)(pw);
665         return opt;
666 }
667
668 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
669 {
670         return FN(PW,opt)(pw, 1);
671 }
672
673 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
674 {
675         return FN(PW,opt)(pw, 0);
676 }
677
678 __isl_give isl_dim *FN(PW,get_dim)(__isl_keep PW *pw)
679 {
680         return pw ? isl_dim_copy(pw->dim) : NULL;
681 }
682
683 __isl_give PW *FN(PW,reset_dim)(__isl_take PW *pw, __isl_take isl_dim *dim)
684 {
685         int i;
686
687         pw = FN(PW,cow)(pw);
688         if (!pw || !dim)
689                 goto error;
690
691         for (i = 0; i < pw->n; ++i) {
692                 pw->p[i].set = isl_set_reset_dim(pw->p[i].set,
693                                                  isl_dim_copy(dim));
694                 if (!pw->p[i].set)
695                         goto error;
696                 pw->p[i].FIELD = FN(EL,reset_dim)(pw->p[i].FIELD,
697                                                   isl_dim_copy(dim));
698                 if (!pw->p[i].FIELD)
699                         goto error;
700         }
701         isl_dim_free(pw->dim);
702         pw->dim = dim;
703
704         return pw;
705 error:
706         isl_dim_free(dim);
707         FN(PW,free)(pw);
708         return NULL;
709 }
710
711 int FN(PW,has_equal_dim)(__isl_keep PW *pw1, __isl_keep PW *pw2)
712 {
713         if (!pw1 || !pw2)
714                 return -1;
715
716         return isl_dim_equal(pw1->dim, pw2->dim);
717 }
718
719 __isl_give PW *FN(PW,morph)(__isl_take PW *pw, __isl_take isl_morph *morph)
720 {
721         int i;
722
723         if (!pw || !morph)
724                 goto error;
725
726         isl_assert(pw->dim->ctx, isl_dim_equal(pw->dim, morph->dom->dim),
727                 goto error);
728
729         pw = FN(PW,cow)(pw);
730         if (!pw)
731                 goto error;
732         isl_dim_free(pw->dim);
733         pw->dim = isl_dim_copy(morph->ran->dim);
734         if (!pw->dim)
735                 goto error;
736
737         for (i = 0; i < pw->n; ++i) {
738                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
739                 if (!pw->p[i].set)
740                         goto error;
741                 pw->p[i].FIELD = FN(EL,morph)(pw->p[i].FIELD,
742                                                 isl_morph_copy(morph));
743                 if (!pw->p[i].FIELD)
744                         goto error;
745         }
746
747         isl_morph_free(morph);
748
749         return pw;
750 error:
751         FN(PW,free)(pw);
752         isl_morph_free(morph);
753         return NULL;
754 }
755
756 int FN(PW,foreach_piece)(__isl_keep PW *pw,
757         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
758         void *user)
759 {
760         int i;
761
762         if (!pw)
763                 return -1;
764
765         for (i = 0; i < pw->n; ++i)
766                 if (fn(isl_set_copy(pw->p[i].set),
767                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
768                         return -1;
769
770         return 0;
771 }
772
773 static int any_divs(__isl_keep isl_set *set)
774 {
775         int i;
776
777         if (!set)
778                 return -1;
779
780         for (i = 0; i < set->n; ++i)
781                 if (set->p[i]->n_div > 0)
782                         return 1;
783
784         return 0;
785 }
786
787 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
788         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
789                     void *user), void *user)
790 {
791         int i;
792
793         if (!set || !el)
794                 goto error;
795
796         for (i = 0; i < set->n; ++i) {
797                 isl_set *lift;
798                 EL *copy;
799
800                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
801                 lift = isl_set_lift(lift);
802
803                 copy = FN(EL,copy)(el);
804                 copy = FN(EL,lift)(copy, isl_set_get_dim(lift));
805
806                 if (fn(lift, copy, user) < 0)
807                         goto error;
808         }
809
810         isl_set_free(set);
811         FN(EL,free)(el);
812
813         return 0;
814 error:
815         isl_set_free(set);
816         FN(EL,free)(el);
817         return -1;
818 }
819
820 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
821         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
822                     void *user), void *user)
823 {
824         int i;
825
826         if (!pw)
827                 return -1;
828
829         for (i = 0; i < pw->n; ++i) {
830                 isl_set *set;
831                 EL *el;
832
833                 set = isl_set_copy(pw->p[i].set);
834                 el = FN(EL,copy)(pw->p[i].FIELD);
835                 if (!any_divs(set)) {
836                         if (fn(set, el, user) < 0)
837                                 return -1;
838                         continue;
839                 }
840                 if (foreach_lifted_subset(set, el, fn, user) < 0)
841                         return -1;
842         }
843
844         return 0;
845 }
846
847 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
848         enum isl_dim_type dst_type, unsigned dst_pos,
849         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
850 {
851         int i;
852
853         pw = FN(PW,cow)(pw);
854         if (!pw)
855                 return NULL;
856
857         pw->dim = isl_dim_move(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
858         if (!pw->dim)
859                 goto error;
860
861         for (i = 0; i < pw->n; ++i) {
862                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
863                                                 dst_type, dst_pos,
864                                                 src_type, src_pos, n);
865                 if (!pw->p[i].set)
866                         goto error;
867                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
868                                         dst_type, dst_pos, src_type, src_pos, n);
869                 if (!pw->p[i].FIELD)
870                         goto error;
871         }
872
873         return pw;
874 error:
875         FN(PW,free)(pw);
876         return NULL;
877 }
878
879 __isl_give PW *FN(PW,realign)(__isl_take PW *pw, __isl_take isl_reordering *exp)
880 {
881         int i;
882
883         pw = FN(PW,cow)(pw);
884         if (!pw || !exp)
885                 return NULL;
886
887         for (i = 0; i < pw->n; ++i) {
888                 pw->p[i].set = isl_set_realign(pw->p[i].set,
889                                                     isl_reordering_copy(exp));
890                 if (!pw->p[i].set)
891                         goto error;
892                 pw->p[i].FIELD = FN(EL,realign)(pw->p[i].FIELD,
893                                                     isl_reordering_copy(exp));
894                 if (!pw->p[i].FIELD)
895                         goto error;
896         }
897
898         pw = FN(PW,reset_dim)(pw, isl_dim_copy(exp->dim));
899
900         isl_reordering_free(exp);
901         return pw;
902 error:
903         isl_reordering_free(exp);
904         FN(PW,free)(pw);
905         return NULL;
906 }