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 #ifndef NO_EVAL
 617 __isl_give isl_qpolynomial *FN(UNION,eval)(__isl_take UNION *u,
 618         __isl_take isl_point *pnt)
 619 {
 620         uint32_t hash;
 621         struct isl_hash_table_entry *entry;
 622         isl_space *space;
 623         isl_qpolynomial *qp;
 624
 625         if (!u || !pnt)
 626                 goto error;
 627
 628         space = isl_space_copy(pnt->dim);
 629         space = isl_space_from_domain(space);
 630         space = isl_space_add_dims(space, isl_dim_out, 1);
 631         if (!space)
 632                 goto error;
 633         hash = isl_space_get_hash(space);
 634         entry = isl_hash_table_find(u->dim->ctx, &u->table,
 635                                     hash, &has_dim, space, 0);
 636         isl_space_free(space);
 637         if (!entry) {
 638                 qp = isl_qpolynomial_zero_on_domain(isl_space_copy(pnt->dim));
 639                 isl_point_free(pnt);
 640         } else {
 641                 qp = FN(PART,eval)(FN(PART,copy)(entry->data), pnt);
 642         }
 643         FN(UNION,free)(u);
 644         return qp;
 645 error:
 646         FN(UNION,free)(u);
 647         isl_point_free(pnt);
 648         return NULL;
 649 }
 650 #endif
 651
 652 static int coalesce_entry(void **entry, void *user)
 653 {
 654         PW **pw = (PW **)entry;
 655
 656         *pw = FN(PW,coalesce)(*pw);
 657         if (!*pw)
 658                 return -1;
 659
 660         return 0;
 661 }
 662
 663 __isl_give UNION *FN(UNION,coalesce)(__isl_take UNION *u)
 664 {
 665         if (!u)
 666                 return NULL;
 667
 668         if (isl_hash_table_foreach(u->dim->ctx, &u->table,
 669                                    &coalesce_entry, NULL) < 0)
 670                 goto error;
 671
 672         return u;
 673 error:
 674         FN(UNION,free)(u);
 675         return NULL;
 676 }
 677
 678 static int domain(__isl_take PART *part, void *user)
 679 {
 680         isl_union_set **uset = (isl_union_set **)user;
 681
 682         *uset = isl_union_set_add_set(*uset, FN(PART,domain)(part));
 683
 684         return 0;
 685 }
 686
 687 __isl_give isl_union_set *FN(UNION,domain)(__isl_take UNION *u)
 688 {
 689         isl_union_set *uset;
 690
 691         uset = isl_union_set_empty(FN(UNION,get_space)(u));
 692         if (FN(FN(UNION,foreach),PARTS)(u, &domain, &uset) < 0)
 693                 goto error;
 694
 695         FN(UNION,free)(u);
 696
 697         return uset;
 698 error:
 699         isl_union_set_free(uset);
 700         FN(UNION,free)(u);
 701         return NULL;
 702 }
 703
 704 static int mul_isl_int(void **entry, void *user)
 705 {
 706         PW **pw = (PW **)entry;
 707         isl_int *v = user;
 708
 709         *pw = FN(PW,mul_isl_int)(*pw, *v);
 710         if (!*pw)
 711                 return -1;
 712
 713         return 0;
 714 }
 715
 716 __isl_give UNION *FN(UNION,mul_isl_int)(__isl_take UNION *u, isl_int v)
 717 {
 718         if (isl_int_is_one(v))
 719                 return u;
 720
 721         if (DEFAULT_IS_ZERO && u && isl_int_is_zero(v)) {
 722                 UNION *zero;
 723                 isl_space *dim = FN(UNION,get_space)(u);
 724 #ifdef HAS_TYPE
 725                 zero = FN(UNION,ZERO)(dim, u->type);
 726 #else
 727                 zero = FN(UNION,ZERO)(dim);
 728 #endif
 729                 FN(UNION,free)(u);
 730                 return zero;
 731         }
 732
 733         u = FN(UNION,cow)(u);
 734         if (!u)
 735                 return NULL;
 736
 737 #ifdef HAS_TYPE
 738         if (isl_int_is_neg(v))
 739                 u->type = isl_fold_type_negate(u->type);
 740 #endif
 741         if (isl_hash_table_foreach(u->dim->ctx, &u->table, &mul_isl_int, v) < 0)
 742                 goto error;
 743
 744         return u;
 745 error:
 746         FN(UNION,free)(u);
 747         return NULL;
 748 }
 749
 750 S(UNION,plain_is_equal_data)
 751 {
 752         UNION *u2;
 753         int is_equal;
 754 };
 755
 756 static int plain_is_equal_entry(void **entry, void *user)
 757 {
 758         S(UNION,plain_is_equal_data) *data = user;
 759         uint32_t hash;
 760         struct isl_hash_table_entry *entry2;
 761         PW *pw = *entry;
 762
 763         hash = isl_space_get_hash(pw->dim);
 764         entry2 = isl_hash_table_find(data->u2->dim->ctx, &data->u2->table,
 765                                      hash, &has_dim, pw->dim, 0);
 766         if (!entry2) {
 767                 data->is_equal = 0;
 768                 return -1;
 769         }
 770
 771         data->is_equal = FN(PW,plain_is_equal)(pw, entry2->data);
 772         if (data->is_equal < 0 || !data->is_equal)
 773                 return -1;
 774
 775         return 0;
 776 }
 777
 778 int FN(UNION,plain_is_equal)(__isl_keep UNION *u1, __isl_keep UNION *u2)
 779 {
 780         S(UNION,plain_is_equal_data) data = { NULL, 1 };
 781
 782         if (!u1 || !u2)
 783                 return -1;
 784         if (u1 == u2)
 785                 return 1;
 786         if (u1->table.n != u2->table.n)
 787                 return 0;
 788
 789         u1 = FN(UNION,copy)(u1);
 790         u2 = FN(UNION,copy)(u2);
 791         u1 = FN(UNION,align_params)(u1, FN(UNION,get_space)(u2));
 792         u2 = FN(UNION,align_params)(u2, FN(UNION,get_space)(u1));
 793         if (!u1 || !u2)
 794                 goto error;
 795
 796         data.u2 = u2;
 797         if (isl_hash_table_foreach(u1->dim->ctx, &u1->table,
 798                                    &plain_is_equal_entry, &data) < 0 &&
 799             data.is_equal)
 800                 goto error;
 801
 802         FN(UNION,free)(u1);
 803         FN(UNION,free)(u2);
 804
 805         return data.is_equal;
 806 error:
 807         FN(UNION,free)(u1);
 808         FN(UNION,free)(u2);
 809         return -1;
 810 }