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 (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 (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;
 251
 252         if (--u->ref > 0)
 253                 return;
 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 }
 260
 261 S(UNION,align) {
 262         isl_reordering *exp;
 263         UNION *res;
 264 };
 265
 266 #ifdef ALIGN_DOMAIN
 267 static int align_entry(__isl_take PART *part, void *user)
 268 {
 269         isl_reordering *exp;
 270         S(UNION,align) *data = user;
 271
 272         exp = isl_reordering_extend_space(isl_reordering_copy(data->exp),
 273                                     FN(PART,get_domain_space)(part));
 274
 275         data->res = FN(FN(UNION,add),PARTS)(data->res,
 276                                             FN(PART,realign_domain)(part, exp));
 277
 278         return 0;
 279 }
 280 #else
 281 static int align_entry(__isl_take PART *part, void *user)
 282 {
 283         isl_reordering *exp;
 284         S(UNION,align) *data = user;
 285
 286         exp = isl_reordering_extend_space(isl_reordering_copy(data->exp),
 287                                     FN(PART,get_space)(part));
 288
 289         data->res = FN(FN(UNION,add),PARTS)(data->res,
 290                                             FN(PART,realign)(part, exp));
 291
 292         return 0;
 293 }
 294 #endif
 295
 296 __isl_give UNION *FN(UNION,align_params)(__isl_take UNION *u,
 297         __isl_take isl_space *model)
 298 {
 299         S(UNION,align) data = { NULL, NULL };
 300
 301         if (!u || !model)
 302                 goto error;
 303
 304         if (isl_space_match(u->dim, isl_dim_param, model, isl_dim_param)) {
 305                 isl_space_free(model);
 306                 return u;
 307         }
 308
 309         data.exp = isl_parameter_alignment_reordering(u->dim, model);
 310         if (!data.exp)
 311                 goto error;
 312
 313 #ifdef HAS_TYPE
 314         data.res = FN(UNION,alloc)(isl_space_copy(data.exp->dim),
 315                                                 u->type, u->table.n);
 316 #else
 317         data.res = FN(UNION,alloc)(isl_space_copy(data.exp->dim), u->table.n);
 318 #endif
 319         if (FN(FN(UNION,foreach),PARTS)(u, &align_entry, &data) < 0)
 320                 goto error;
 321
 322         isl_reordering_free(data.exp);
 323         FN(UNION,free)(u);
 324         isl_space_free(model);
 325         return data.res;
 326 error:
 327         isl_reordering_free(data.exp);
 328         FN(UNION,free)(u);
 329         FN(UNION,free)(data.res);
 330         isl_space_free(model);
 331         return NULL;
 332 }
 333
 334 __isl_give UNION *FN(UNION,add)(__isl_take UNION *u1, __isl_take UNION *u2)
 335 {
 336         u1 = FN(UNION,align_params)(u1, FN(UNION,get_space)(u2));
 337         u2 = FN(UNION,align_params)(u2, FN(UNION,get_space)(u1));
 338
 339         u1 = FN(UNION,cow)(u1);
 340
 341         if (!u1 || !u2)
 342                 goto error;
 343
 344         if (FN(FN(UNION,foreach),PARTS)(u2, &add_part, &u1) < 0)
 345                 goto error;
 346
 347         FN(UNION,free)(u2);
 348
 349         return u1;
 350 error:
 351         FN(UNION,free)(u1);
 352         FN(UNION,free)(u2);
 353         return NULL;
 354 }
 355
 356 __isl_give UNION *FN(FN(UNION,from),PARTS)(__isl_take PART *part)
 357 {
 358         isl_space *dim;
 359         UNION *u;
 360
 361         if (!part)
 362                 return NULL;
 363
 364         dim = FN(PART,get_space)(part);
 365         dim = isl_space_drop_dims(dim, isl_dim_in, 0, isl_space_dim(dim, isl_dim_in));
 366         dim = isl_space_drop_dims(dim, isl_dim_out, 0, isl_space_dim(dim, isl_dim_out));
 367 #ifdef HAS_TYPE
 368         u = FN(UNION,zero)(dim, part->type);
 369 #else
 370         u = FN(UNION,zero)(dim);
 371 #endif
 372         u = FN(FN(UNION,add),PARTS)(u, part);
 373
 374         return u;
 375 }
 376
 377 S(UNION,match_bin_data) {
 378         UNION *u2;
 379         UNION *res;
 380 };
 381
 382 /* This function is currently only used from isl_polynomial.c
 383  * and not from isl_fold.c.
 384  */
 385 static __isl_give UNION *match_bin_op(__isl_take UNION *u1,
 386         __isl_take UNION *u2,
 387         int (*fn)(void **, void *)) __attribute__ ((unused));
 388 static __isl_give UNION *match_bin_op(__isl_take UNION *u1,
 389         __isl_take UNION *u2, int (*fn)(void **, void *))
 390 {
 391         S(UNION,match_bin_data) data = { NULL, NULL };
 392
 393         u1 = FN(UNION,align_params)(u1, FN(UNION,get_space)(u2));
 394         u2 = FN(UNION,align_params)(u2, FN(UNION,get_space)(u1));
 395
 396         if (!u1 || !u2)
 397                 goto error;
 398
 399         data.u2 = u2;
 400 #ifdef HAS_TYPE
 401         data.res = FN(UNION,alloc)(isl_space_copy(u1->dim), u1->type, u1->table.n);
 402 #else
 403         data.res = FN(UNION,alloc)(isl_space_copy(u1->dim), u1->table.n);
 404 #endif
 405         if (isl_hash_table_foreach(u1->dim->ctx, &u1->table, fn, &data) < 0)
 406                 goto error;
 407
 408         FN(UNION,free)(u1);
 409         FN(UNION,free)(u2);
 410         return data.res;
 411 error:
 412         FN(UNION,free)(u1);
 413         FN(UNION,free)(u2);
 414         FN(UNION,free)(data.res);
 415         return NULL;
 416 }
 417
 418 S(UNION,any_set_data) {
 419         isl_set *set;
 420         UNION *res;
 421         __isl_give PW *(*fn)(__isl_take PW*, __isl_take isl_set*);
 422 };
 423
 424 static int any_set_entry(void **entry, void *user)
 425 {
 426         S(UNION,any_set_data) *data = user;
 427         PW *pw = *entry;
 428         int empty;
 429
 430         pw = FN(PW,copy)(pw);
 431         pw = data->fn(pw, isl_set_copy(data->set));
 432
 433         empty = FN(PW,is_zero)(pw);
 434         if (empty < 0) {
 435                 FN(PW,free)(pw);
 436                 return -1;
 437         }
 438         if (empty) {
 439                 FN(PW,free)(pw);
 440                 return 0;
 441         }
 442
 443         data->res = FN(FN(UNION,add),PARTS)(data->res, pw);
 444
 445         return 0;
 446 }
 447
 448 /* Update each element of "u" by calling "fn" on the element and "set".
 449  */
 450 static __isl_give UNION *any_set_op(__isl_take UNION *u,
 451         __isl_take isl_set *set,
 452         __isl_give PW *(*fn)(__isl_take PW*, __isl_take isl_set*))
 453 {
 454         S(UNION,any_set_data) data = { NULL, NULL, fn };
 455
 456         u = FN(UNION,align_params)(u, isl_set_get_space(set));
 457         set = isl_set_align_params(set, FN(UNION,get_space)(u));
 458
 459         if (!u || !set)
 460                 goto error;
 461
 462         data.set = set;
 463 #ifdef HAS_TYPE
 464         data.res = FN(UNION,alloc)(isl_space_copy(u->dim), u->type, u->table.n);
 465 #else
 466         data.res = FN(UNION,alloc)(isl_space_copy(u->dim), u->table.n);
 467 #endif
 468         if (isl_hash_table_foreach(u->dim->ctx, &u->table,
 469                                    &any_set_entry, &data) < 0)
 470                 goto error;
 471
 472         FN(UNION,free)(u);
 473         isl_set_free(set);
 474         return data.res;
 475 error:
 476         FN(UNION,free)(u);
 477         isl_set_free(set);
 478         FN(UNION,free)(data.res);
 479         return NULL;
 480 }
 481
 482 /* Intersect the domain of "u" with the parameter domain "context".
 483  */
 484 __isl_give UNION *FN(UNION,intersect_params)(__isl_take UNION *u,
 485         __isl_take isl_set *set)
 486 {
 487         return any_set_op(u, set, &FN(PW,intersect_params));
 488 }
 489
 490 S(UNION,match_set_data) {
 491         isl_union_set *uset;
 492         UNION *res;
 493         __isl_give PW *(*fn)(__isl_take PW*, __isl_take isl_set*);
 494 };
 495
 496 static int set_has_dim(const void *entry, const void *val)
 497 {
 498         isl_set *set = (isl_set *)entry;
 499         isl_space *dim = (isl_space *)val;
 500
 501         return isl_space_is_equal(set->dim, dim);
 502 }
 503
 504 static int match_set_entry(void **entry, void *user)
 505 {
 506         S(UNION,match_set_data) *data = user;
 507         uint32_t hash;
 508         struct isl_hash_table_entry *entry2;
 509         PW *pw = *entry;
 510         int empty;
 511
 512         hash = isl_space_get_hash(pw->dim);
 513         entry2 = isl_hash_table_find(data->uset->dim->ctx, &data->uset->table,
 514                                      hash, &set_has_dim, pw->dim, 0);
 515         if (!entry2)
 516                 return 0;
 517
 518         pw = FN(PW,copy)(pw);
 519         pw = data->fn(pw, isl_set_copy(entry2->data));
 520
 521         empty = FN(PW,is_zero)(pw);
 522         if (empty < 0) {
 523                 FN(PW,free)(pw);
 524                 return -1;
 525         }
 526         if (empty) {
 527                 FN(PW,free)(pw);
 528                 return 0;
 529         }
 530
 531         data->res = FN(FN(UNION,add),PARTS)(data->res, pw);
 532
 533         return 0;
 534 }
 535
 536 static __isl_give UNION *match_set_op(__isl_take UNION *u,
 537         __isl_take isl_union_set *uset,
 538         __isl_give PW *(*fn)(__isl_take PW*, __isl_take isl_set*))
 539 {
 540         S(UNION,match_set_data) data = { NULL, NULL, fn };
 541
 542         u = FN(UNION,align_params)(u, isl_union_set_get_space(uset));
 543         uset = isl_union_set_align_params(uset, FN(UNION,get_space)(u));
 544
 545         if (!u || !uset)
 546                 goto error;
 547
 548         data.uset = uset;
 549 #ifdef HAS_TYPE
 550         data.res = FN(UNION,alloc)(isl_space_copy(u->dim), u->type, u->table.n);
 551 #else
 552         data.res = FN(UNION,alloc)(isl_space_copy(u->dim), u->table.n);
 553 #endif
 554         if (isl_hash_table_foreach(u->dim->ctx, &u->table,
 555                                    &match_set_entry, &data) < 0)
 556                 goto error;
 557
 558         FN(UNION,free)(u);
 559         isl_union_set_free(uset);
 560         return data.res;
 561 error:
 562         FN(UNION,free)(u);
 563         isl_union_set_free(uset);
 564         FN(UNION,free)(data.res);
 565         return NULL;
 566 }
 567
 568 __isl_give UNION *FN(UNION,intersect_domain)(__isl_take UNION *u,
 569         __isl_take isl_union_set *uset)
 570 {
 571         return match_set_op(u, uset, &FN(PW,intersect_domain));
 572 }
 573
 574 __isl_give UNION *FN(UNION,gist)(__isl_take UNION *u,
 575         __isl_take isl_union_set *uset)
 576 {
 577         return match_set_op(u, uset, &FN(PW,gist));
 578 }
 579
 580 __isl_give isl_qpolynomial *FN(UNION,eval)(__isl_take UNION *u,
 581         __isl_take isl_point *pnt)
 582 {
 583         uint32_t hash;
 584         struct isl_hash_table_entry *entry;
 585         isl_space *space;
 586         isl_qpolynomial *qp;
 587
 588         if (!u || !pnt)
 589                 goto error;
 590
 591         space = isl_space_copy(pnt->dim);
 592         space = isl_space_from_domain(space);
 593         space = isl_space_add_dims(space, isl_dim_out, 1);
 594         if (!space)
 595                 goto error;
 596         hash = isl_space_get_hash(space);
 597         entry = isl_hash_table_find(u->dim->ctx, &u->table,
 598                                     hash, &has_dim, space, 0);
 599         isl_space_free(space);
 600         if (!entry) {
 601                 qp = isl_qpolynomial_zero_on_domain(isl_space_copy(pnt->dim));
 602                 isl_point_free(pnt);
 603         } else {
 604                 qp = FN(PART,eval)(FN(PART,copy)(entry->data), pnt);
 605         }
 606         FN(UNION,free)(u);
 607         return qp;
 608 error:
 609         FN(UNION,free)(u);
 610         isl_point_free(pnt);
 611         return NULL;
 612 }
 613
 614 static int coalesce_entry(void **entry, void *user)
 615 {
 616         PW **pw = (PW **)entry;
 617
 618         *pw = FN(PW,coalesce)(*pw);
 619         if (!*pw)
 620                 return -1;
 621
 622         return 0;
 623 }
 624
 625 __isl_give UNION *FN(UNION,coalesce)(__isl_take UNION *u)
 626 {
 627         if (!u)
 628                 return NULL;
 629
 630         if (isl_hash_table_foreach(u->dim->ctx, &u->table,
 631                                    &coalesce_entry, NULL) < 0)
 632                 goto error;
 633
 634         return u;
 635 error:
 636         FN(UNION,free)(u);
 637         return NULL;
 638 }
 639
 640 static int domain(__isl_take PART *part, void *user)
 641 {
 642         isl_union_set **uset = (isl_union_set **)user;
 643
 644         *uset = isl_union_set_add_set(*uset, FN(PART,domain)(part));
 645
 646         return 0;
 647 }
 648
 649 __isl_give isl_union_set *FN(UNION,domain)(__isl_take UNION *u)
 650 {
 651         isl_union_set *uset;
 652
 653         uset = isl_union_set_empty(FN(UNION,get_space)(u));
 654         if (FN(FN(UNION,foreach),PARTS)(u, &domain, &uset) < 0)
 655                 goto error;
 656
 657         FN(UNION,free)(u);
 658
 659         return uset;
 660 error:
 661         isl_union_set_free(uset);
 662         FN(UNION,free)(u);
 663         return NULL;
 664 }
 665
 666 static int mul_isl_int(void **entry, void *user)
 667 {
 668         PW **pw = (PW **)entry;
 669         isl_int *v = user;
 670
 671         *pw = FN(PW,mul_isl_int)(*pw, *v);
 672         if (!*pw)
 673                 return -1;
 674
 675         return 0;
 676 }
 677
 678 __isl_give UNION *FN(UNION,mul_isl_int)(__isl_take UNION *u, isl_int v)
 679 {
 680         if (isl_int_is_one(v))
 681                 return u;
 682
 683         if (u && isl_int_is_zero(v)) {
 684                 UNION *zero;
 685                 isl_space *dim = FN(UNION,get_space)(u);
 686 #ifdef HAS_TYPE
 687                 zero = FN(UNION,zero)(dim, u->type);
 688 #else
 689                 zero = FN(UNION,zero)(dim);
 690 #endif
 691                 FN(UNION,free)(u);
 692                 return zero;
 693         }
 694
 695         u = FN(UNION,cow)(u);
 696         if (!u)
 697                 return NULL;
 698
 699 #ifdef HAS_TYPE
 700         if (isl_int_is_neg(v))
 701                 u->type = isl_fold_type_negate(u->type);
 702 #endif
 703         if (isl_hash_table_foreach(u->dim->ctx, &u->table, &mul_isl_int, v) < 0)
 704                 goto error;
 705
 706         return u;
 707 error:
 708         FN(UNION,free)(u);
 709         return NULL;
 710 }
 711
 712 S(UNION,plain_is_equal_data)
 713 {
 714         UNION *u2;
 715         int is_equal;
 716 };
 717
 718 static int plain_is_equal_entry(void **entry, void *user)
 719 {
 720         S(UNION,plain_is_equal_data) *data = user;
 721         uint32_t hash;
 722         struct isl_hash_table_entry *entry2;
 723         PW *pw = *entry;
 724
 725         hash = isl_space_get_hash(pw->dim);
 726         entry2 = isl_hash_table_find(data->u2->dim->ctx, &data->u2->table,
 727                                      hash, &has_dim, pw->dim, 0);
 728         if (!entry2) {
 729                 data->is_equal = 0;
 730                 return -1;
 731         }
 732
 733         data->is_equal = FN(PW,plain_is_equal)(pw, entry2->data);
 734         if (data->is_equal < 0 || !data->is_equal)
 735                 return -1;
 736
 737         return 0;
 738 }
 739
 740 int FN(UNION,plain_is_equal)(__isl_keep UNION *u1, __isl_keep UNION *u2)
 741 {
 742         S(UNION,plain_is_equal_data) data = { NULL, 1 };
 743
 744         if (!u1 || !u2)
 745                 return -1;
 746         if (u1 == u2)
 747                 return 1;
 748         if (u1->table.n != u2->table.n)
 749                 return 0;
 750
 751         u1 = FN(UNION,copy)(u1);
 752         u2 = FN(UNION,copy)(u2);
 753         u1 = FN(UNION,align_params)(u1, FN(UNION,get_space)(u2));
 754         u2 = FN(UNION,align_params)(u2, FN(UNION,get_space)(u1));
 755         if (!u1 || !u2)
 756                 goto error;
 757
 758         data.u2 = u2;
 759         if (isl_hash_table_foreach(u1->dim->ctx, &u1->table,
 760                                    &plain_is_equal_entry, &data) < 0 &&
 761             data.is_equal)
 762                 goto error;
 763
 764         FN(UNION,free)(u1);
 765         FN(UNION,free)(u2);
 766
 767         return data.is_equal;
 768 error:
 769         FN(UNION,free)(u1);
 770         FN(UNION,free)(u2);
 771         return -1;
 772 }