isl_union_pw_*: don't assume zero is the default value
[platform/upstream/isl.git] / isl_union_templ.c
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 #define xFN(TYPE,NAME) TYPE ## _ ## NAME
12 #define FN(TYPE,NAME) xFN(TYPE,NAME)
13 #define xS(TYPE,NAME) struct TYPE ## _ ## NAME
14 #define S(TYPE,NAME) xS(TYPE,NAME)
15
16 struct UNION {
17         int ref;
18 #ifdef HAS_TYPE
19         enum isl_fold type;
20 #endif
21         isl_space *dim;
22
23         struct isl_hash_table   table;
24 };
25
26 __isl_give UNION *FN(UNION,cow)(__isl_take UNION *u);
27
28 isl_ctx *FN(UNION,get_ctx)(__isl_keep UNION *u)
29 {
30         return u ? u->dim->ctx : NULL;
31 }
32
33 __isl_give isl_space *FN(UNION,get_space)(__isl_keep UNION *u)
34 {
35         if (!u)
36                 return NULL;
37         return isl_space_copy(u->dim);
38 }
39
40 #ifdef HAS_TYPE
41 static __isl_give UNION *FN(UNION,alloc)(__isl_take isl_space *dim,
42         enum isl_fold type, int size)
43 #else
44 static __isl_give UNION *FN(UNION,alloc)(__isl_take isl_space *dim, int size)
45 #endif
46 {
47         UNION *u;
48
49         dim = isl_space_params(dim);
50         if (!dim)
51                 return NULL;
52
53         u = isl_calloc_type(dim->ctx, UNION);
54         if (!u)
55                 return NULL;
56
57         u->ref = 1;
58 #ifdef HAS_TYPE
59         u->type = type;
60 #endif
61         u->dim = dim;
62         if (isl_hash_table_init(dim->ctx, &u->table, size) < 0)
63                 goto error;
64
65         return u;
66 error:
67         isl_space_free(dim);
68         FN(UNION,free)(u);
69         return NULL;
70 }
71
72 #ifdef HAS_TYPE
73 __isl_give UNION *FN(UNION,ZERO)(__isl_take isl_space *dim, enum isl_fold type)
74 {
75         return FN(UNION,alloc)(dim, type, 16);
76 }
77 #else
78 __isl_give UNION *FN(UNION,ZERO)(__isl_take isl_space *dim)
79 {
80         return FN(UNION,alloc)(dim, 16);
81 }
82 #endif
83
84 __isl_give UNION *FN(UNION,copy)(__isl_keep UNION *u)
85 {
86         if (!u)
87                 return NULL;
88
89         u->ref++;
90         return u;
91 }
92
93 S(UNION,foreach_data)
94 {
95         int (*fn)(__isl_take PART *part, void *user);
96         void *user;
97 };
98
99 static int call_on_copy(void **entry, void *user)
100 {
101         PART *part = *entry;
102         S(UNION,foreach_data) *data = (S(UNION,foreach_data) *)user;
103
104         return data->fn(FN(PART,copy)(part), data->user);
105 }
106
107 int FN(FN(UNION,foreach),PARTS)(__isl_keep UNION *u,
108         int (*fn)(__isl_take PART *part, void *user), void *user)
109 {
110         S(UNION,foreach_data) data = { fn, user };
111
112         if (!u)
113                 return -1;
114
115         return isl_hash_table_foreach(u->dim->ctx, &u->table,
116                                       &call_on_copy, &data);
117 }
118
119 static int has_dim(const void *entry, const void *val)
120 {
121         PART *part = (PART *)entry;
122         isl_space *dim = (isl_space *)val;
123
124         return isl_space_is_equal(part->dim, dim);
125 }
126
127 __isl_give PART *FN(FN(UNION,extract),PARTS)(__isl_keep UNION *u,
128         __isl_take isl_space *dim)
129 {
130         uint32_t hash;
131         struct isl_hash_table_entry *entry;
132
133         if (!u || !dim)
134                 goto error;
135
136         hash = isl_space_get_hash(dim);
137         entry = isl_hash_table_find(u->dim->ctx, &u->table, hash,
138                                     &has_dim, dim, 0);
139         if (!entry)
140 #ifdef HAS_TYPE
141                 return FN(PART,ZERO)(dim, u->type);
142 #else
143                 return FN(PART,ZERO)(dim);
144 #endif
145         isl_space_free(dim);
146         return FN(PART,copy)(entry->data);
147 error:
148         isl_space_free(dim);
149         return NULL;
150 }
151
152 __isl_give UNION *FN(FN(UNION,add),PARTS)(__isl_take UNION *u,
153         __isl_take PART *part)
154 {
155         uint32_t hash;
156         struct isl_hash_table_entry *entry;
157
158         if (!part)
159                 goto error;
160
161         if (DEFAULT_IS_ZERO && FN(PART,IS_ZERO)(part)) {
162                 FN(PART,free)(part);
163                 return u;
164         }
165
166         u = FN(UNION,cow)(u);
167
168         if (!u)
169                 goto error;
170
171         isl_assert(u->dim->ctx, isl_space_match(part->dim, isl_dim_param, u->dim,
172                                               isl_dim_param), goto error);
173
174         hash = isl_space_get_hash(part->dim);
175         entry = isl_hash_table_find(u->dim->ctx, &u->table, hash,
176                                     &has_dim, part->dim, 1);
177         if (!entry)
178                 goto error;
179
180         if (!entry->data)
181                 entry->data = part;
182         else {
183                 entry->data = FN(PART,add)(entry->data, FN(PART,copy)(part));
184                 if (!entry->data)
185                         goto error;
186                 FN(PART,free)(part);
187                 if (DEFAULT_IS_ZERO && FN(PART,IS_ZERO)(entry->data)) {
188                         FN(PART,free)(entry->data);
189                         isl_hash_table_remove(u->dim->ctx, &u->table, entry);
190                 }
191         }
192
193         return u;
194 error:
195         FN(PART,free)(part);
196         FN(UNION,free)(u);
197         return NULL;
198 }
199
200 static int add_part(__isl_take PART *part, void *user)
201 {
202         UNION **u = (UNION **)user;
203
204         *u = FN(FN(UNION,add),PARTS)(*u, part);
205
206         return 0;
207 }
208
209 __isl_give UNION *FN(UNION,dup)(__isl_keep UNION *u)
210 {
211         UNION *dup;
212
213         if (!u)
214                 return NULL;
215
216 #ifdef HAS_TYPE
217         dup = FN(UNION,ZERO)(isl_space_copy(u->dim), u->type);
218 #else
219         dup = FN(UNION,ZERO)(isl_space_copy(u->dim));
220 #endif
221         if (FN(FN(UNION,foreach),PARTS)(u, &add_part, &dup) < 0)
222                 goto error;
223         return dup;
224 error:
225         FN(UNION,free)(dup);
226         return NULL;
227 }
228
229 __isl_give UNION *FN(UNION,cow)(__isl_take UNION *u)
230 {
231         if (!u)
232                 return NULL;
233
234         if (u->ref == 1)
235                 return u;
236         u->ref--;
237         return FN(UNION,dup)(u);
238 }
239
240 static int free_u_entry(void **entry, void *user)
241 {
242         PART *part = *entry;
243         FN(PART,free)(part);
244         return 0;
245 }
246
247 void *FN(UNION,free)(__isl_take UNION *u)
248 {
249         if (!u)
250                 return NULL;
251
252         if (--u->ref > 0)
253                 return NULL;
254
255         isl_hash_table_foreach(u->dim->ctx, &u->table, &free_u_entry, NULL);
256         isl_hash_table_clear(&u->table);
257         isl_space_free(u->dim);
258         free(u);
259         return NULL;
260 }
261
262 S(UNION,align) {
263         isl_reordering *exp;
264         UNION *res;
265 };
266
267 #ifdef ALIGN_DOMAIN
268 static int align_entry(__isl_take PART *part, void *user)
269 {
270         isl_reordering *exp;
271         S(UNION,align) *data = user;
272
273         exp = isl_reordering_extend_space(isl_reordering_copy(data->exp),
274                                     FN(PART,get_domain_space)(part));
275
276         data->res = FN(FN(UNION,add),PARTS)(data->res,
277                                             FN(PART,realign_domain)(part, exp));
278
279         return 0;
280 }
281 #else
282 static int align_entry(__isl_take PART *part, void *user)
283 {
284         isl_reordering *exp;
285         S(UNION,align) *data = user;
286
287         exp = isl_reordering_extend_space(isl_reordering_copy(data->exp),
288                                     FN(PART,get_space)(part));
289
290         data->res = FN(FN(UNION,add),PARTS)(data->res,
291                                             FN(PART,realign)(part, exp));
292
293         return 0;
294 }
295 #endif
296
297 __isl_give UNION *FN(UNION,align_params)(__isl_take UNION *u,
298         __isl_take isl_space *model)
299 {
300         S(UNION,align) data = { NULL, NULL };
301
302         if (!u || !model)
303                 goto error;
304
305         if (isl_space_match(u->dim, isl_dim_param, model, isl_dim_param)) {
306                 isl_space_free(model);
307                 return u;
308         }
309
310         data.exp = isl_parameter_alignment_reordering(u->dim, model);
311         if (!data.exp)
312                 goto error;
313
314 #ifdef HAS_TYPE
315         data.res = FN(UNION,alloc)(isl_space_copy(data.exp->dim),
316                                                 u->type, u->table.n);
317 #else
318         data.res = FN(UNION,alloc)(isl_space_copy(data.exp->dim), u->table.n);
319 #endif
320         if (FN(FN(UNION,foreach),PARTS)(u, &align_entry, &data) < 0)
321                 goto error;
322
323         isl_reordering_free(data.exp);
324         FN(UNION,free)(u);
325         isl_space_free(model);
326         return data.res;
327 error:
328         isl_reordering_free(data.exp);
329         FN(UNION,free)(u);
330         FN(UNION,free)(data.res);
331         isl_space_free(model);
332         return NULL;
333 }
334
335 __isl_give UNION *FN(UNION,add)(__isl_take UNION *u1, __isl_take UNION *u2)
336 {
337         u1 = FN(UNION,align_params)(u1, FN(UNION,get_space)(u2));
338         u2 = FN(UNION,align_params)(u2, FN(UNION,get_space)(u1));
339
340         u1 = FN(UNION,cow)(u1);
341
342         if (!u1 || !u2)
343                 goto error;
344
345         if (FN(FN(UNION,foreach),PARTS)(u2, &add_part, &u1) < 0)
346                 goto error;
347
348         FN(UNION,free)(u2);
349
350         return u1;
351 error:
352         FN(UNION,free)(u1);
353         FN(UNION,free)(u2);
354         return NULL;
355 }
356
357 __isl_give UNION *FN(FN(UNION,from),PARTS)(__isl_take PART *part)
358 {
359         isl_space *dim;
360         UNION *u;
361
362         if (!part)
363                 return NULL;
364
365         dim = FN(PART,get_space)(part);
366         dim = isl_space_drop_dims(dim, isl_dim_in, 0, isl_space_dim(dim, isl_dim_in));
367         dim = isl_space_drop_dims(dim, isl_dim_out, 0, isl_space_dim(dim, isl_dim_out));
368 #ifdef HAS_TYPE
369         u = FN(UNION,ZERO)(dim, part->type);
370 #else
371         u = FN(UNION,ZERO)(dim);
372 #endif
373         u = FN(FN(UNION,add),PARTS)(u, part);
374
375         return u;
376 }
377
378 S(UNION,match_bin_data) {
379         UNION *u2;
380         UNION *res;
381 };
382
383 /* This function is currently only used from isl_polynomial.c
384  * and not from isl_fold.c.
385  */
386 static __isl_give UNION *match_bin_op(__isl_take UNION *u1,
387         __isl_take UNION *u2,
388         int (*fn)(void **, void *)) __attribute__ ((unused));
389 static __isl_give UNION *match_bin_op(__isl_take UNION *u1,
390         __isl_take UNION *u2, int (*fn)(void **, void *))
391 {
392         S(UNION,match_bin_data) data = { NULL, NULL };
393
394         u1 = FN(UNION,align_params)(u1, FN(UNION,get_space)(u2));
395         u2 = FN(UNION,align_params)(u2, FN(UNION,get_space)(u1));
396
397         if (!u1 || !u2)
398                 goto error;
399
400         data.u2 = u2;
401 #ifdef HAS_TYPE
402         data.res = FN(UNION,alloc)(isl_space_copy(u1->dim), u1->type, u1->table.n);
403 #else
404         data.res = FN(UNION,alloc)(isl_space_copy(u1->dim), u1->table.n);
405 #endif
406         if (isl_hash_table_foreach(u1->dim->ctx, &u1->table, fn, &data) < 0)
407                 goto error;
408
409         FN(UNION,free)(u1);
410         FN(UNION,free)(u2);
411         return data.res;
412 error:
413         FN(UNION,free)(u1);
414         FN(UNION,free)(u2);
415         FN(UNION,free)(data.res);
416         return NULL;
417 }
418
419 S(UNION,any_set_data) {
420         isl_set *set;
421         UNION *res;
422         __isl_give PW *(*fn)(__isl_take PW*, __isl_take isl_set*);
423 };
424
425 static int any_set_entry(void **entry, void *user)
426 {
427         S(UNION,any_set_data) *data = user;
428         PW *pw = *entry;
429
430         pw = FN(PW,copy)(pw);
431         pw = data->fn(pw, isl_set_copy(data->set));
432
433         if (DEFAULT_IS_ZERO) {
434                 int empty;
435
436                 empty = FN(PW,IS_ZERO)(pw);
437                 if (empty < 0) {
438                         FN(PW,free)(pw);
439                         return -1;
440                 }
441                 if (empty) {
442                         FN(PW,free)(pw);
443                         return 0;
444                 }
445         }
446
447         data->res = FN(FN(UNION,add),PARTS)(data->res, pw);
448
449         return 0;
450 }
451
452 /* Update each element of "u" by calling "fn" on the element and "set".
453  */
454 static __isl_give UNION *any_set_op(__isl_take UNION *u,
455         __isl_take isl_set *set,
456         __isl_give PW *(*fn)(__isl_take PW*, __isl_take isl_set*))
457 {
458         S(UNION,any_set_data) data = { NULL, NULL, fn };
459
460         u = FN(UNION,align_params)(u, isl_set_get_space(set));
461         set = isl_set_align_params(set, FN(UNION,get_space)(u));
462
463         if (!u || !set)
464                 goto error;
465
466         data.set = set;
467 #ifdef HAS_TYPE
468         data.res = FN(UNION,alloc)(isl_space_copy(u->dim), u->type, u->table.n);
469 #else
470         data.res = FN(UNION,alloc)(isl_space_copy(u->dim), u->table.n);
471 #endif
472         if (isl_hash_table_foreach(u->dim->ctx, &u->table,
473                                    &any_set_entry, &data) < 0)
474                 goto error;
475
476         FN(UNION,free)(u);
477         isl_set_free(set);
478         return data.res;
479 error:
480         FN(UNION,free)(u);
481         isl_set_free(set);
482         FN(UNION,free)(data.res);
483         return NULL;
484 }
485
486 /* Intersect the domain of "u" with the parameter domain "context".
487  */
488 __isl_give UNION *FN(UNION,intersect_params)(__isl_take UNION *u,
489         __isl_take isl_set *set)
490 {
491         return any_set_op(u, set, &FN(PW,intersect_params));
492 }
493
494 /* Compute the gist of the domain of "u" with respect to
495  * the parameter domain "context".
496  */
497 __isl_give UNION *FN(UNION,gist_params)(__isl_take UNION *u,
498         __isl_take isl_set *set)
499 {
500         return any_set_op(u, set, &FN(PW,gist_params));
501 }
502
503 S(UNION,match_domain_data) {
504         isl_union_set *uset;
505         UNION *res;
506         __isl_give PW *(*fn)(__isl_take PW*, __isl_take isl_set*);
507 };
508
509 static int set_has_dim(const void *entry, const void *val)
510 {
511         isl_set *set = (isl_set *)entry;
512         isl_space *dim = (isl_space *)val;
513
514         return isl_space_is_equal(set->dim, dim);
515 }
516
517 /* Find the set in data->uset that live in the same space as the domain
518  * of *entry, apply data->fn to *entry and this set (if any), and add
519  * the result to data->res.
520  */
521 static int match_domain_entry(void **entry, void *user)
522 {
523         S(UNION,match_domain_data) *data = user;
524         uint32_t hash;
525         struct isl_hash_table_entry *entry2;
526         PW *pw = *entry;
527         isl_space *space;
528
529         space = FN(PW,get_domain_space)(pw);
530         hash = isl_space_get_hash(space);
531         entry2 = isl_hash_table_find(data->uset->dim->ctx, &data->uset->table,
532                                      hash, &set_has_dim, space, 0);
533         isl_space_free(space);
534         if (!entry2)
535                 return 0;
536
537         pw = FN(PW,copy)(pw);
538         pw = data->fn(pw, isl_set_copy(entry2->data));
539
540         if (DEFAULT_IS_ZERO) {
541                 int empty;
542
543                 empty = FN(PW,IS_ZERO)(pw);
544                 if (empty < 0) {
545                         FN(PW,free)(pw);
546                         return -1;
547                 }
548                 if (empty) {
549                         FN(PW,free)(pw);
550                         return 0;
551                 }
552         }
553
554         data->res = FN(FN(UNION,add),PARTS)(data->res, pw);
555
556         return 0;
557 }
558
559 /* Apply fn to each pair of PW in u and set in uset such that
560  * the set lives in the same space as the domain of PW
561  * and collect the results.
562  */
563 static __isl_give UNION *match_domain_op(__isl_take UNION *u,
564         __isl_take isl_union_set *uset,
565         __isl_give PW *(*fn)(__isl_take PW*, __isl_take isl_set*))
566 {
567         S(UNION,match_domain_data) data = { NULL, NULL, fn };
568
569         u = FN(UNION,align_params)(u, isl_union_set_get_space(uset));
570         uset = isl_union_set_align_params(uset, FN(UNION,get_space)(u));
571
572         if (!u || !uset)
573                 goto error;
574
575         data.uset = uset;
576 #ifdef HAS_TYPE
577         data.res = FN(UNION,alloc)(isl_space_copy(u->dim), u->type, u->table.n);
578 #else
579         data.res = FN(UNION,alloc)(isl_space_copy(u->dim), u->table.n);
580 #endif
581         if (isl_hash_table_foreach(u->dim->ctx, &u->table,
582                                    &match_domain_entry, &data) < 0)
583                 goto error;
584
585         FN(UNION,free)(u);
586         isl_union_set_free(uset);
587         return data.res;
588 error:
589         FN(UNION,free)(u);
590         isl_union_set_free(uset);
591         FN(UNION,free)(data.res);
592         return NULL;
593 }
594
595 /* Intersect the domain of "u" with "uset".
596  * If "uset" is a parameters domain, then intersect the parameter
597  * domain of "u" with this set.
598  */
599 __isl_give UNION *FN(UNION,intersect_domain)(__isl_take UNION *u,
600         __isl_take isl_union_set *uset)
601 {
602         if (isl_union_set_is_params(uset))
603                 return FN(UNION,intersect_params)(u,
604                                                 isl_set_from_union_set(uset));
605         return match_domain_op(u, uset, &FN(PW,intersect_domain));
606 }
607
608 __isl_give UNION *FN(UNION,gist)(__isl_take UNION *u,
609         __isl_take isl_union_set *uset)
610 {
611         if (isl_union_set_is_params(uset))
612                 return FN(UNION,gist_params)(u, isl_set_from_union_set(uset));
613         return match_domain_op(u, uset, &FN(PW,gist));
614 }
615
616 __isl_give isl_qpolynomial *FN(UNION,eval)(__isl_take UNION *u,
617         __isl_take isl_point *pnt)
618 {
619         uint32_t hash;
620         struct isl_hash_table_entry *entry;
621         isl_space *space;
622         isl_qpolynomial *qp;
623
624         if (!u || !pnt)
625                 goto error;
626
627         space = isl_space_copy(pnt->dim);
628         space = isl_space_from_domain(space);
629         space = isl_space_add_dims(space, isl_dim_out, 1);
630         if (!space)
631                 goto error;
632         hash = isl_space_get_hash(space);
633         entry = isl_hash_table_find(u->dim->ctx, &u->table,
634                                     hash, &has_dim, space, 0);
635         isl_space_free(space);
636         if (!entry) {
637                 qp = isl_qpolynomial_zero_on_domain(isl_space_copy(pnt->dim));
638                 isl_point_free(pnt);
639         } else {
640                 qp = FN(PART,eval)(FN(PART,copy)(entry->data), pnt);
641         }
642         FN(UNION,free)(u);
643         return qp;
644 error:
645         FN(UNION,free)(u);
646         isl_point_free(pnt);
647         return NULL;
648 }
649
650 static int coalesce_entry(void **entry, void *user)
651 {
652         PW **pw = (PW **)entry;
653
654         *pw = FN(PW,coalesce)(*pw);
655         if (!*pw)
656                 return -1;
657
658         return 0;
659 }
660
661 __isl_give UNION *FN(UNION,coalesce)(__isl_take UNION *u)
662 {
663         if (!u)
664                 return NULL;
665
666         if (isl_hash_table_foreach(u->dim->ctx, &u->table,
667                                    &coalesce_entry, NULL) < 0)
668                 goto error;
669
670         return u;
671 error:
672         FN(UNION,free)(u);
673         return NULL;
674 }
675
676 static int domain(__isl_take PART *part, void *user)
677 {
678         isl_union_set **uset = (isl_union_set **)user;
679
680         *uset = isl_union_set_add_set(*uset, FN(PART,domain)(part));
681
682         return 0;
683 }
684
685 __isl_give isl_union_set *FN(UNION,domain)(__isl_take UNION *u)
686 {
687         isl_union_set *uset;
688
689         uset = isl_union_set_empty(FN(UNION,get_space)(u));
690         if (FN(FN(UNION,foreach),PARTS)(u, &domain, &uset) < 0)
691                 goto error;
692
693         FN(UNION,free)(u);
694         
695         return uset;
696 error:
697         isl_union_set_free(uset);
698         FN(UNION,free)(u);
699         return NULL;
700 }
701
702 static int mul_isl_int(void **entry, void *user)
703 {
704         PW **pw = (PW **)entry;
705         isl_int *v = user;
706
707         *pw = FN(PW,mul_isl_int)(*pw, *v);
708         if (!*pw)
709                 return -1;
710
711         return 0;
712 }
713
714 __isl_give UNION *FN(UNION,mul_isl_int)(__isl_take UNION *u, isl_int v)
715 {
716         if (isl_int_is_one(v))
717                 return u;
718
719         if (DEFAULT_IS_ZERO && u && isl_int_is_zero(v)) {
720                 UNION *zero;
721                 isl_space *dim = FN(UNION,get_space)(u);
722 #ifdef HAS_TYPE
723                 zero = FN(UNION,ZERO)(dim, u->type);
724 #else
725                 zero = FN(UNION,ZERO)(dim);
726 #endif
727                 FN(UNION,free)(u);
728                 return zero;
729         }
730
731         u = FN(UNION,cow)(u);
732         if (!u)
733                 return NULL;
734
735 #ifdef HAS_TYPE
736         if (isl_int_is_neg(v))
737                 u->type = isl_fold_type_negate(u->type);
738 #endif
739         if (isl_hash_table_foreach(u->dim->ctx, &u->table, &mul_isl_int, v) < 0)
740                 goto error;
741
742         return u;
743 error:
744         FN(UNION,free)(u);
745         return NULL;
746 }
747
748 S(UNION,plain_is_equal_data)
749 {
750         UNION *u2;
751         int is_equal;
752 };
753
754 static int plain_is_equal_entry(void **entry, void *user)
755 {
756         S(UNION,plain_is_equal_data) *data = user;
757         uint32_t hash;
758         struct isl_hash_table_entry *entry2;
759         PW *pw = *entry;
760
761         hash = isl_space_get_hash(pw->dim);
762         entry2 = isl_hash_table_find(data->u2->dim->ctx, &data->u2->table,
763                                      hash, &has_dim, pw->dim, 0);
764         if (!entry2) {
765                 data->is_equal = 0;
766                 return -1;
767         }
768
769         data->is_equal = FN(PW,plain_is_equal)(pw, entry2->data);
770         if (data->is_equal < 0 || !data->is_equal)
771                 return -1;
772
773         return 0;
774 }
775
776 int FN(UNION,plain_is_equal)(__isl_keep UNION *u1, __isl_keep UNION *u2)
777 {
778         S(UNION,plain_is_equal_data) data = { NULL, 1 };
779
780         if (!u1 || !u2)
781                 return -1;
782         if (u1 == u2)
783                 return 1;
784         if (u1->table.n != u2->table.n)
785                 return 0;
786
787         u1 = FN(UNION,copy)(u1);
788         u2 = FN(UNION,copy)(u2);
789         u1 = FN(UNION,align_params)(u1, FN(UNION,get_space)(u2));
790         u2 = FN(UNION,align_params)(u2, FN(UNION,get_space)(u1));
791         if (!u1 || !u2)
792                 goto error;
793
794         data.u2 = u2;
795         if (isl_hash_table_foreach(u1->dim->ctx, &u1->table,
796                                    &plain_is_equal_entry, &data) < 0 &&
797             data.is_equal)
798                 goto error;
799
800         FN(UNION,free)(u1);
801         FN(UNION,free)(u2);
802
803         return data.is_equal;
804 error:
805         FN(UNION,free)(u1);
806         FN(UNION,free)(u2);
807         return -1;
808 }