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 __isl_give PW *FN(PW,alloc_size)(__isl_take isl_space *dim,
   8         enum isl_fold type, int n)
   9 #else
  10 __isl_give PW *FN(PW,alloc_size)(__isl_take isl_space *dim, int n)
  11 #endif
  12 {
  13         isl_ctx *ctx;
  14         struct PW *pw;
  15
  16         if (!dim)
  17                 return NULL;
  18         ctx = isl_space_get_ctx(dim);
  19         isl_assert(ctx, n >= 0, goto error);
  20         pw = isl_alloc(ctx, struct PW,
  21                         sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
  22         if (!pw)
  23                 goto error;
  24
  25         pw->ref = 1;
  26 #ifdef HAS_TYPE
  27         pw->type = type;
  28 #endif
  29         pw->size = n;
  30         pw->n = 0;
  31         pw->dim = dim;
  32         return pw;
  33 error:
  34         isl_space_free(dim);
  35         return NULL;
  36 }
  37
  38 #ifdef HAS_TYPE
  39 __isl_give PW *FN(PW,ZERO)(__isl_take isl_space *dim, enum isl_fold type)
  40 {
  41         return FN(PW,alloc_size)(dim, type, 0);
  42 }
  43 #else
  44 __isl_give PW *FN(PW,ZERO)(__isl_take isl_space *dim)
  45 {
  46         return FN(PW,alloc_size)(dim, 0);
  47 }
  48 #endif
  49
  50 __isl_give PW *FN(PW,add_piece)(__isl_take PW *pw,
  51         __isl_take isl_set *set, __isl_take EL *el)
  52 {
  53         isl_ctx *ctx;
  54         isl_space *el_dim = NULL;
  55
  56         if (!pw || !set || !el)
  57                 goto error;
  58
  59         if (isl_set_plain_is_empty(set) || FN(EL,EL_IS_ZERO)(el)) {
  60                 isl_set_free(set);
  61                 FN(EL,free)(el);
  62                 return pw;
  63         }
  64
  65         ctx = isl_set_get_ctx(set);
  66 #ifdef HAS_TYPE
  67         if (pw->type != el->type)
  68                 isl_die(ctx, isl_error_invalid, "fold types don't match",
  69                         goto error);
  70 #endif
  71         el_dim = FN(EL,get_space(el));
  72         isl_assert(ctx, isl_space_is_equal(pw->dim, el_dim), goto error);
  73         isl_assert(ctx, pw->n < pw->size, goto error);
  74
  75         pw->p[pw->n].set = set;
  76         pw->p[pw->n].FIELD = el;
  77         pw->n++;
  78
  79         isl_space_free(el_dim);
  80         return pw;
  81 error:
  82         isl_space_free(el_dim);
  83         FN(PW,free)(pw);
  84         isl_set_free(set);
  85         FN(EL,free)(el);
  86         return NULL;
  87 }
  88
  89 #ifdef HAS_TYPE
  90 __isl_give PW *FN(PW,alloc)(enum isl_fold type,
  91         __isl_take isl_set *set, __isl_take EL *el)
  92 #else
  93 __isl_give PW *FN(PW,alloc)(__isl_take isl_set *set, __isl_take EL *el)
  94 #endif
  95 {
  96         PW *pw;
  97
  98         if (!set || !el)
  99                 goto error;
 100
 101 #ifdef HAS_TYPE
 102         pw = FN(PW,alloc_size)(FN(EL,get_space)(el), type, 1);
 103 #else
 104         pw = FN(PW,alloc_size)(FN(EL,get_space)(el), 1);
 105 #endif
 106
 107         return FN(PW,add_piece)(pw, set, el);
 108 error:
 109         isl_set_free(set);
 110         FN(EL,free)(el);
 111         return NULL;
 112 }
 113
 114 __isl_give PW *FN(PW,dup)(__isl_keep PW *pw)
 115 {
 116         int i;
 117         PW *dup;
 118
 119         if (!pw)
 120                 return NULL;
 121
 122 #ifdef HAS_TYPE
 123         dup = FN(PW,alloc_size)(isl_space_copy(pw->dim), pw->type, pw->n);
 124 #else
 125         dup = FN(PW,alloc_size)(isl_space_copy(pw->dim), pw->n);
 126 #endif
 127         if (!dup)
 128                 return NULL;
 129
 130         for (i = 0; i < pw->n; ++i)
 131                 dup = FN(PW,add_piece)(dup, isl_set_copy(pw->p[i].set),
 132                                             FN(EL,copy)(pw->p[i].FIELD));
 133
 134         return dup;
 135 }
 136
 137 __isl_give PW *FN(PW,cow)(__isl_take PW *pw)
 138 {
 139         if (!pw)
 140                 return NULL;
 141
 142         if (pw->ref == 1)
 143                 return pw;
 144         pw->ref--;
 145         return FN(PW,dup)(pw);
 146 }
 147
 148 __isl_give PW *FN(PW,copy)(__isl_keep PW *pw)
 149 {
 150         if (!pw)
 151                 return NULL;
 152
 153         pw->ref++;
 154         return pw;
 155 }
 156
 157 void *FN(PW,free)(__isl_take PW *pw)
 158 {
 159         int i;
 160
 161         if (!pw)
 162                 return NULL;
 163         if (--pw->ref > 0)
 164                 return NULL;
 165
 166         for (i = 0; i < pw->n; ++i) {
 167                 isl_set_free(pw->p[i].set);
 168                 FN(EL,free)(pw->p[i].FIELD);
 169         }
 170         isl_space_free(pw->dim);
 171         free(pw);
 172
 173         return NULL;
 174 }
 175
 176 int FN(PW,IS_ZERO)(__isl_keep PW *pw)
 177 {
 178         if (!pw)
 179                 return -1;
 180
 181         return pw->n == 0;
 182 }
 183
 184 #ifndef NO_REALIGN
 185 __isl_give PW *FN(PW,realign_domain)(__isl_take PW *pw,
 186         __isl_take isl_reordering *exp)
 187 {
 188         int i;
 189
 190         pw = FN(PW,cow)(pw);
 191         if (!pw || !exp)
 192                 return NULL;
 193
 194         for (i = 0; i < pw->n; ++i) {
 195                 pw->p[i].set = isl_set_realign(pw->p[i].set,
 196                                                     isl_reordering_copy(exp));
 197                 if (!pw->p[i].set)
 198                         goto error;
 199                 pw->p[i].FIELD = FN(EL,realign_domain)(pw->p[i].FIELD,
 200                                                     isl_reordering_copy(exp));
 201                 if (!pw->p[i].FIELD)
 202                         goto error;
 203         }
 204
 205         pw = FN(PW,reset_domain_space)(pw, isl_space_copy(exp->dim));
 206
 207         isl_reordering_free(exp);
 208         return pw;
 209 error:
 210         isl_reordering_free(exp);
 211         FN(PW,free)(pw);
 212         return NULL;
 213 }
 214
 215 /* Align the parameters of "pw" to those of "model".
 216  */
 217 __isl_give PW *FN(PW,align_params)(__isl_take PW *pw, __isl_take isl_space *model)
 218 {
 219         isl_ctx *ctx;
 220
 221         if (!pw || !model)
 222                 goto error;
 223
 224         ctx = isl_space_get_ctx(model);
 225         if (!isl_space_has_named_params(model))
 226                 isl_die(ctx, isl_error_invalid,
 227                         "model has unnamed parameters", goto error);
 228         if (!isl_space_has_named_params(pw->dim))
 229                 isl_die(ctx, isl_error_invalid,
 230                         "input has unnamed parameters", goto error);
 231         if (!isl_space_match(pw->dim, isl_dim_param, model, isl_dim_param)) {
 232                 isl_reordering *exp;
 233
 234                 model = isl_space_drop_dims(model, isl_dim_in,
 235                                         0, isl_space_dim(model, isl_dim_in));
 236                 model = isl_space_drop_dims(model, isl_dim_out,
 237                                         0, isl_space_dim(model, isl_dim_out));
 238                 exp = isl_parameter_alignment_reordering(pw->dim, model);
 239                 exp = isl_reordering_extend_space(exp,
 240                                         FN(PW,get_domain_space)(pw));
 241                 pw = FN(PW,realign_domain)(pw, exp);
 242         }
 243
 244         isl_space_free(model);
 245         return pw;
 246 error:
 247         isl_space_free(model);
 248         FN(PW,free)(pw);
 249         return NULL;
 250 }
 251
 252 static __isl_give PW *FN(PW,align_params_pw_pw_and)(__isl_take PW *pw1,
 253         __isl_take PW *pw2,
 254         __isl_give PW *(*fn)(__isl_take PW *pw1, __isl_take PW *pw2))
 255 {
 256         isl_ctx *ctx;
 257
 258         if (!pw1 || !pw2)
 259                 goto error;
 260         if (isl_space_match(pw1->dim, isl_dim_param, pw2->dim, isl_dim_param))
 261                 return fn(pw1, pw2);
 262         ctx = FN(PW,get_ctx)(pw1);
 263         if (!isl_space_has_named_params(pw1->dim) ||
 264             !isl_space_has_named_params(pw2->dim))
 265                 isl_die(ctx, isl_error_invalid,
 266                         "unaligned unnamed parameters", goto error);
 267         pw1 = FN(PW,align_params)(pw1, FN(PW,get_space)(pw2));
 268         pw2 = FN(PW,align_params)(pw2, FN(PW,get_space)(pw1));
 269         return fn(pw1, pw2);
 270 error:
 271         FN(PW,free)(pw1);
 272         FN(PW,free)(pw2);
 273         return NULL;
 274 }
 275
 276 static __isl_give PW *FN(PW,align_params_pw_set_and)(__isl_take PW *pw,
 277         __isl_take isl_set *set,
 278         __isl_give PW *(*fn)(__isl_take PW *pw, __isl_take isl_set *set))
 279 {
 280         isl_ctx *ctx;
 281
 282         if (!pw || !set)
 283                 goto error;
 284         if (isl_space_match(pw->dim, isl_dim_param, set->dim, isl_dim_param))
 285                 return fn(pw, set);
 286         ctx = FN(PW,get_ctx)(pw);
 287         if (!isl_space_has_named_params(pw->dim) ||
 288             !isl_space_has_named_params(set->dim))
 289                 isl_die(ctx, isl_error_invalid,
 290                         "unaligned unnamed parameters", goto error);
 291         pw = FN(PW,align_params)(pw, isl_set_get_space(set));
 292         set = isl_set_align_params(set, FN(PW,get_space)(pw));
 293         return fn(pw, set);
 294 error:
 295         FN(PW,free)(pw);
 296         isl_set_free(set);
 297         return NULL;
 298 }
 299 #endif
 300
 301 static __isl_give PW *FN(PW,add_aligned)(__isl_take PW *pw1, __isl_take PW *pw2)
 302 {
 303         int i, j, n;
 304         struct PW *res;
 305         isl_ctx *ctx;
 306         isl_set *set;
 307
 308         if (!pw1 || !pw2)
 309                 goto error;
 310
 311         ctx = isl_space_get_ctx(pw1->dim);
 312 #ifdef HAS_TYPE
 313         if (pw1->type != pw2->type)
 314                 isl_die(ctx, isl_error_invalid,
 315                         "fold types don't match", goto error);
 316 #endif
 317         isl_assert(ctx, isl_space_is_equal(pw1->dim, pw2->dim), goto error);
 318
 319         if (FN(PW,IS_ZERO)(pw1)) {
 320                 FN(PW,free)(pw1);
 321                 return pw2;
 322         }
 323
 324         if (FN(PW,IS_ZERO)(pw2)) {
 325                 FN(PW,free)(pw2);
 326                 return pw1;
 327         }
 328
 329         n = (pw1->n + 1) * (pw2->n + 1);
 330 #ifdef HAS_TYPE
 331         res = FN(PW,alloc_size)(isl_space_copy(pw1->dim), pw1->type, n);
 332 #else
 333         res = FN(PW,alloc_size)(isl_space_copy(pw1->dim), n);
 334 #endif
 335
 336         for (i = 0; i < pw1->n; ++i) {
 337                 set = isl_set_copy(pw1->p[i].set);
 338                 for (j = 0; j < pw2->n; ++j) {
 339                         struct isl_set *common;
 340                         EL *sum;
 341                         set = isl_set_subtract(set,
 342                                         isl_set_copy(pw2->p[j].set));
 343                         common = isl_set_intersect(isl_set_copy(pw1->p[i].set),
 344                                                 isl_set_copy(pw2->p[j].set));
 345                         if (isl_set_plain_is_empty(common)) {
 346                                 isl_set_free(common);
 347                                 continue;
 348                         }
 349
 350                         sum = FN(EL,add_on_domain)(common,
 351                                                    FN(EL,copy)(pw1->p[i].FIELD),
 352                                                    FN(EL,copy)(pw2->p[j].FIELD));
 353
 354                         res = FN(PW,add_piece)(res, common, sum);
 355                 }
 356                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw1->p[i].FIELD));
 357         }
 358
 359         for (j = 0; j < pw2->n; ++j) {
 360                 set = isl_set_copy(pw2->p[j].set);
 361                 for (i = 0; i < pw1->n; ++i)
 362                         set = isl_set_subtract(set,
 363                                         isl_set_copy(pw1->p[i].set));
 364                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw2->p[j].FIELD));
 365         }
 366
 367         FN(PW,free)(pw1);
 368         FN(PW,free)(pw2);
 369
 370         return res;
 371 error:
 372         FN(PW,free)(pw1);
 373         FN(PW,free)(pw2);
 374         return NULL;
 375 }
 376
 377 __isl_give PW *FN(PW,add)(__isl_take PW *pw1, __isl_take PW *pw2)
 378 {
 379         return FN(PW,align_params_pw_pw_and)(pw1, pw2, &FN(PW,add_aligned));
 380 }
 381
 382 /* Make sure "pw" has room for at least "n" more pieces.
 383  *
 384  * If there is only one reference to pw, we extend it in place.
 385  * Otherwise, we create a new PW and copy the pieces.
 386  */
 387 static __isl_give PW *FN(PW,grow)(__isl_take PW *pw, int n)
 388 {
 389         int i;
 390         isl_ctx *ctx;
 391         PW *res;
 392
 393         if (!pw)
 394                 return NULL;
 395         if (pw->n + n <= pw->size)
 396                 return pw;
 397         ctx = FN(PW,get_ctx)(pw);
 398         n += pw->n;
 399         if (pw->ref == 1) {
 400                 res = isl_realloc(ctx, pw, struct PW,
 401                             sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
 402                 if (!res)
 403                         return FN(PW,free)(pw);
 404                 res->size = n;
 405                 return res;
 406         }
 407 #ifdef HAS_TYPE
 408         res = FN(PW,alloc_size)(isl_space_copy(pw->dim), pw->type, n);
 409 #else
 410         res = FN(PW,alloc_size)(isl_space_copy(pw->dim), n);
 411 #endif
 412         if (!res)
 413                 return FN(PW,free)(pw);
 414         for (i = 0; i < pw->n; ++i)
 415                 res = FN(PW,add_piece)(res, isl_set_copy(pw->p[i].set),
 416                                             FN(EL,copy)(pw->p[i].FIELD));
 417         FN(PW,free)(pw);
 418         return res;
 419 }
 420
 421 static __isl_give PW *FN(PW,add_disjoint_aligned)(__isl_take PW *pw1,
 422         __isl_take PW *pw2)
 423 {
 424         int i;
 425         isl_ctx *ctx;
 426
 427         if (!pw1 || !pw2)
 428                 goto error;
 429
 430         if (pw1->size < pw1->n + pw2->n && pw1->n < pw2->n)
 431                 return FN(PW,add_disjoint_aligned)(pw2, pw1);
 432
 433         ctx = isl_space_get_ctx(pw1->dim);
 434 #ifdef HAS_TYPE
 435         if (pw1->type != pw2->type)
 436                 isl_die(ctx, isl_error_invalid,
 437                         "fold types don't match", goto error);
 438 #endif
 439         isl_assert(ctx, isl_space_is_equal(pw1->dim, pw2->dim), goto error);
 440
 441         if (FN(PW,IS_ZERO)(pw1)) {
 442                 FN(PW,free)(pw1);
 443                 return pw2;
 444         }
 445
 446         if (FN(PW,IS_ZERO)(pw2)) {
 447                 FN(PW,free)(pw2);
 448                 return pw1;
 449         }
 450
 451         pw1 = FN(PW,grow)(pw1, pw2->n);
 452         if (!pw1)
 453                 goto error;
 454
 455         for (i = 0; i < pw2->n; ++i)
 456                 pw1 = FN(PW,add_piece)(pw1,
 457                                 isl_set_copy(pw2->p[i].set),
 458                                 FN(EL,copy)(pw2->p[i].FIELD));
 459
 460         FN(PW,free)(pw2);
 461
 462         return pw1;
 463 error:
 464         FN(PW,free)(pw1);
 465         FN(PW,free)(pw2);
 466         return NULL;
 467 }
 468
 469 __isl_give PW *FN(PW,add_disjoint)(__isl_take PW *pw1, __isl_take PW *pw2)
 470 {
 471         return FN(PW,align_params_pw_pw_and)(pw1, pw2,
 472                                                 &FN(PW,add_disjoint_aligned));
 473 }
 474
 475 #ifndef NO_NEG
 476 __isl_give PW *FN(PW,neg)(__isl_take PW *pw)
 477 {
 478         int i;
 479
 480         if (!pw)
 481                 return NULL;
 482
 483         if (FN(PW,IS_ZERO)(pw))
 484                 return pw;
 485
 486         pw = FN(PW,cow)(pw);
 487         if (!pw)
 488                 return NULL;
 489
 490         for (i = 0; i < pw->n; ++i) {
 491                 pw->p[i].FIELD = FN(EL,neg)(pw->p[i].FIELD);
 492                 if (!pw->p[i].FIELD)
 493                         return FN(PW,free)(pw);
 494         }
 495
 496         return pw;
 497 }
 498
 499 __isl_give PW *FN(PW,sub)(__isl_take PW *pw1, __isl_take PW *pw2)
 500 {
 501         return FN(PW,add)(pw1, FN(PW,neg)(pw2));
 502 }
 503 #endif
 504
 505 #ifndef NO_EVAL
 506 __isl_give isl_qpolynomial *FN(PW,eval)(__isl_take PW *pw,
 507         __isl_take isl_point *pnt)
 508 {
 509         int i;
 510         int found = 0;
 511         isl_ctx *ctx;
 512         isl_space *pnt_dim = NULL;
 513         isl_qpolynomial *qp;
 514
 515         if (!pw || !pnt)
 516                 goto error;
 517         ctx = isl_point_get_ctx(pnt);
 518         pnt_dim = isl_point_get_space(pnt);
 519         isl_assert(ctx, isl_space_is_domain(pnt_dim, pw->dim), goto error);
 520
 521         for (i = 0; i < pw->n; ++i) {
 522                 found = isl_set_contains_point(pw->p[i].set, pnt);
 523                 if (found < 0)
 524                         goto error;
 525                 if (found)
 526                         break;
 527         }
 528         if (found)
 529                 qp = FN(EL,eval)(FN(EL,copy)(pw->p[i].FIELD),
 530                                             isl_point_copy(pnt));
 531         else
 532                 qp = isl_qpolynomial_zero_on_domain(FN(PW,get_domain_space)(pw));
 533         FN(PW,free)(pw);
 534         isl_space_free(pnt_dim);
 535         isl_point_free(pnt);
 536         return qp;
 537 error:
 538         FN(PW,free)(pw);
 539         isl_space_free(pnt_dim);
 540         isl_point_free(pnt);
 541         return NULL;
 542 }
 543 #endif
 544
 545 __isl_give isl_set *FN(PW,domain)(__isl_take PW *pw)
 546 {
 547         int i;
 548         isl_set *dom;
 549
 550         if (!pw)
 551                 return NULL;
 552
 553         dom = isl_set_empty(FN(PW,get_domain_space)(pw));
 554         for (i = 0; i < pw->n; ++i)
 555                 dom = isl_set_union_disjoint(dom, isl_set_copy(pw->p[i].set));
 556
 557         FN(PW,free)(pw);
 558
 559         return dom;
 560 }
 561
 562 static __isl_give PW *FN(PW,intersect_domain_aligned)(__isl_take PW *pw,
 563         __isl_take isl_set *set)
 564 {
 565         int i;
 566
 567         if (!pw || !set)
 568                 goto error;
 569
 570         if (pw->n == 0) {
 571                 isl_set_free(set);
 572                 return pw;
 573         }
 574
 575         pw = FN(PW,cow)(pw);
 576         if (!pw)
 577                 goto error;
 578
 579         for (i = pw->n - 1; i >= 0; --i) {
 580                 isl_basic_set *aff;
 581                 pw->p[i].set = isl_set_intersect(pw->p[i].set, isl_set_copy(set));
 582                 if (!pw->p[i].set)
 583                         goto error;
 584                 aff = isl_set_affine_hull(isl_set_copy(pw->p[i].set));
 585                 pw->p[i].FIELD = FN(EL,substitute_equalities)(pw->p[i].FIELD,
 586                                                                 aff);
 587                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 588                         isl_set_free(pw->p[i].set);
 589                         FN(EL,free)(pw->p[i].FIELD);
 590                         if (i != pw->n - 1)
 591                                 pw->p[i] = pw->p[pw->n - 1];
 592                         pw->n--;
 593                 }
 594         }
 595
 596         isl_set_free(set);
 597         return pw;
 598 error:
 599         isl_set_free(set);
 600         FN(PW,free)(pw);
 601         return NULL;
 602 }
 603
 604 __isl_give PW *FN(PW,intersect_domain)(__isl_take PW *pw,
 605         __isl_take isl_set *context)
 606 {
 607         return FN(PW,align_params_pw_set_and)(pw, context,
 608                                         &FN(PW,intersect_domain_aligned));
 609 }
 610
 611 static __isl_give PW *FN(PW,gist_aligned)(__isl_take PW *pw,
 612         __isl_take isl_set *context)
 613 {
 614         int i;
 615         isl_basic_set *hull = NULL;
 616
 617         if (!pw || !context)
 618                 goto error;
 619
 620         if (pw->n == 0) {
 621                 isl_set_free(context);
 622                 return pw;
 623         }
 624
 625         if (!isl_space_match(pw->dim, isl_dim_param,
 626                                 context->dim, isl_dim_param)) {
 627                 pw = FN(PW,align_params)(pw, isl_set_get_space(context));
 628                 context = isl_set_align_params(context, FN(PW,get_space)(pw));
 629         }
 630
 631         context = isl_set_compute_divs(context);
 632         hull = isl_set_simple_hull(isl_set_copy(context));
 633
 634         pw = FN(PW,cow)(pw);
 635         if (!pw)
 636                 goto error;
 637
 638         for (i = pw->n - 1; i >= 0; --i) {
 639                 pw->p[i].set = isl_set_intersect(pw->p[i].set,
 640                                                  isl_set_copy(context));
 641                 if (!pw->p[i].set)
 642                         goto error;
 643                 pw->p[i].FIELD = FN(EL,gist)(pw->p[i].FIELD,
 644                                              isl_set_copy(pw->p[i].set));
 645                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 646                                                 isl_basic_set_copy(hull));
 647                 if (!pw->p[i].set)
 648                         goto error;
 649                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 650                         isl_set_free(pw->p[i].set);
 651                         FN(EL,free)(pw->p[i].FIELD);
 652                         if (i != pw->n - 1)
 653                                 pw->p[i] = pw->p[pw->n - 1];
 654                         pw->n--;
 655                 }
 656         }
 657
 658         isl_basic_set_free(hull);
 659         isl_set_free(context);
 660
 661         return pw;
 662 error:
 663         FN(PW,free)(pw);
 664         isl_basic_set_free(hull);
 665         isl_set_free(context);
 666         return NULL;
 667 }
 668
 669 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
 670 {
 671         return FN(PW,align_params_pw_set_and)(pw, context, &FN(PW,gist_aligned));
 672 }
 673
 674 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 675 {
 676         int i, j;
 677
 678         if (!pw)
 679                 return NULL;
 680         if (pw->n == 0)
 681                 return pw;
 682
 683         for (i = pw->n - 1; i >= 0; --i) {
 684                 for (j = i - 1; j >= 0; --j) {
 685                         if (!FN(EL,plain_is_equal)(pw->p[i].FIELD,
 686                                                         pw->p[j].FIELD))
 687                                 continue;
 688                         pw->p[j].set = isl_set_union(pw->p[j].set,
 689                                                         pw->p[i].set);
 690                         FN(EL,free)(pw->p[i].FIELD);
 691                         if (i != pw->n - 1)
 692                                 pw->p[i] = pw->p[pw->n - 1];
 693                         pw->n--;
 694                         break;
 695                 }
 696                 if (j >= 0)
 697                         continue;
 698                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 699                 if (!pw->p[i].set)
 700                         goto error;
 701         }
 702
 703         return pw;
 704 error:
 705         FN(PW,free)(pw);
 706         return NULL;
 707 }
 708
 709 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 710 {
 711         return pw ? isl_space_get_ctx(pw->dim) : NULL;
 712 }
 713
 714 #ifndef NO_INVOLVES_DIMS
 715 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 716         unsigned first, unsigned n)
 717 {
 718         int i;
 719         enum isl_dim_type set_type;
 720
 721         if (!pw)
 722                 return -1;
 723         if (pw->n == 0 || n == 0)
 724                 return 0;
 725
 726         set_type = type == isl_dim_in ? isl_dim_set : type;
 727
 728         for (i = 0; i < pw->n; ++i) {
 729                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 730                                                         type, first, n);
 731                 if (involves < 0 || involves)
 732                         return involves;
 733                 involves = isl_set_involves_dims(pw->p[i].set,
 734                                                         set_type, first, n);
 735                 if (involves < 0 || involves)
 736                         return involves;
 737         }
 738         return 0;
 739 }
 740 #endif
 741
 742 __isl_give PW *FN(PW,set_dim_name)(__isl_take PW *pw,
 743         enum isl_dim_type type, unsigned pos, const char *s)
 744 {
 745         int i;
 746         enum isl_dim_type set_type;
 747
 748         pw = FN(PW,cow)(pw);
 749         if (!pw)
 750                 return NULL;
 751
 752         set_type = type == isl_dim_in ? isl_dim_set : type;
 753
 754         pw->dim = isl_space_set_dim_name(pw->dim, type, pos, s);
 755         if (!pw->dim)
 756                 goto error;
 757
 758         for (i = 0; i < pw->n; ++i) {
 759                 pw->p[i].set = isl_set_set_dim_name(pw->p[i].set,
 760                                                         set_type, pos, s);
 761                 if (!pw->p[i].set)
 762                         goto error;
 763                 pw->p[i].FIELD = FN(EL,set_dim_name)(pw->p[i].FIELD, type, pos, s);
 764                 if (!pw->p[i].FIELD)
 765                         goto error;
 766         }
 767
 768         return pw;
 769 error:
 770         FN(PW,free)(pw);
 771         return NULL;
 772 }
 773
 774 #ifndef NO_DROP_DIMS
 775 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 776         enum isl_dim_type type, unsigned first, unsigned n)
 777 {
 778         int i;
 779         enum isl_dim_type set_type;
 780
 781         if (!pw)
 782                 return NULL;
 783         if (n == 0 && !isl_space_get_tuple_name(pw->dim, type))
 784                 return pw;
 785
 786         set_type = type == isl_dim_in ? isl_dim_set : type;
 787
 788         pw = FN(PW,cow)(pw);
 789         if (!pw)
 790                 return NULL;
 791         pw->dim = isl_space_drop_dims(pw->dim, type, first, n);
 792         if (!pw->dim)
 793                 goto error;
 794         for (i = 0; i < pw->n; ++i) {
 795                 pw->p[i].set = isl_set_drop(pw->p[i].set, set_type, first, n);
 796                 if (!pw->p[i].set)
 797                         goto error;
 798                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 799                 if (!pw->p[i].FIELD)
 800                         goto error;
 801         }
 802
 803         return pw;
 804 error:
 805         FN(PW,free)(pw);
 806         return NULL;
 807 }
 808
 809 /* This function is very similar to drop_dims.
 810  * The only difference is that the cells may still involve
 811  * the specified dimensions.  They are removed using
 812  * isl_set_project_out instead of isl_set_drop.
 813  */
 814 __isl_give PW *FN(PW,project_out)(__isl_take PW *pw,
 815         enum isl_dim_type type, unsigned first, unsigned n)
 816 {
 817         int i;
 818         enum isl_dim_type set_type;
 819
 820         if (!pw)
 821                 return NULL;
 822         if (n == 0 && !isl_space_get_tuple_name(pw->dim, type))
 823                 return pw;
 824
 825         set_type = type == isl_dim_in ? isl_dim_set : type;
 826
 827         pw = FN(PW,cow)(pw);
 828         if (!pw)
 829                 return NULL;
 830         pw->dim = isl_space_drop_dims(pw->dim, type, first, n);
 831         if (!pw->dim)
 832                 goto error;
 833         for (i = 0; i < pw->n; ++i) {
 834                 pw->p[i].set = isl_set_project_out(pw->p[i].set,
 835                                                         set_type, first, n);
 836                 if (!pw->p[i].set)
 837                         goto error;
 838                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 839                 if (!pw->p[i].FIELD)
 840                         goto error;
 841         }
 842
 843         return pw;
 844 error:
 845         FN(PW,free)(pw);
 846         return NULL;
 847 }
 848
 849 /* Project the domain of pw onto its parameter space.
 850  */
 851 __isl_give PW *FN(PW,project_domain_on_params)(__isl_take PW *pw)
 852 {
 853         isl_space *space;
 854         unsigned n;
 855
 856         n = FN(PW,dim)(pw, isl_dim_in);
 857         pw = FN(PW,project_out)(pw, isl_dim_in, 0, n);
 858         space = FN(PW,get_domain_space)(pw);
 859         space = isl_space_params(space);
 860         pw = FN(PW,reset_domain_space)(pw, space);
 861         return pw;
 862 }
 863 #endif
 864
 865 #ifndef NO_INSERT_DIMS
 866 __isl_give PW *FN(PW,insert_dims)(__isl_take PW *pw, enum isl_dim_type type,
 867         unsigned first, unsigned n)
 868 {
 869         int i;
 870         enum isl_dim_type set_type;
 871
 872         if (!pw)
 873                 return NULL;
 874         if (n == 0 && !isl_space_is_named_or_nested(pw->dim, type))
 875                 return pw;
 876
 877         set_type = type == isl_dim_in ? isl_dim_set : type;
 878
 879         pw = FN(PW,cow)(pw);
 880         if (!pw)
 881                 return NULL;
 882
 883         pw->dim = isl_space_insert_dims(pw->dim, type, first, n);
 884         if (!pw->dim)
 885                 goto error;
 886
 887         for (i = 0; i < pw->n; ++i) {
 888                 pw->p[i].set = isl_set_insert_dims(pw->p[i].set,
 889                                                             set_type, first, n);
 890                 if (!pw->p[i].set)
 891                         goto error;
 892                 pw->p[i].FIELD = FN(EL,insert_dims)(pw->p[i].FIELD,
 893                                                                 type, first, n);
 894                 if (!pw->p[i].FIELD)
 895                         goto error;
 896         }
 897
 898         return pw;
 899 error:
 900         FN(PW,free)(pw);
 901         return NULL;
 902 }
 903 #endif
 904
 905 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
 906         enum isl_dim_type type, unsigned pos, isl_int v)
 907 {
 908         int i;
 909
 910         if (!pw)
 911                 return NULL;
 912
 913         if (type == isl_dim_in)
 914                 type = isl_dim_set;
 915
 916         pw = FN(PW,cow)(pw);
 917         if (!pw)
 918                 return NULL;
 919         for (i = 0; i < pw->n; ++i) {
 920                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
 921                 if (!pw->p[i].set)
 922                         goto error;
 923         }
 924
 925         return pw;
 926 error:
 927         FN(PW,free)(pw);
 928         return NULL;
 929 }
 930
 931 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
 932 {
 933         return pw ? isl_space_dim(pw->dim, type) : 0;
 934 }
 935
 936 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
 937         enum isl_dim_type type, unsigned first, unsigned n)
 938 {
 939         int i;
 940
 941         if (!pw)
 942                 return NULL;
 943         if (n == 0)
 944                 return pw;
 945
 946         if (type == isl_dim_in)
 947                 type = isl_dim_set;
 948
 949         pw = FN(PW,cow)(pw);
 950         if (!pw)
 951                 return NULL;
 952         if (!pw->dim)
 953                 goto error;
 954         for (i = 0; i < pw->n; ++i) {
 955                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
 956                 if (!pw->p[i].set)
 957                         goto error;
 958         }
 959
 960         return pw;
 961 error:
 962         FN(PW,free)(pw);
 963         return NULL;
 964 }
 965
 966 #ifndef NO_OPT
 967 /* Compute the maximal value attained by the piecewise quasipolynomial
 968  * on its domain or zero if the domain is empty.
 969  * In the worst case, the domain is scanned completely,
 970  * so the domain is assumed to be bounded.
 971  */
 972 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
 973 {
 974         int i;
 975         isl_qpolynomial *opt;
 976
 977         if (!pw)
 978                 return NULL;
 979
 980         if (pw->n == 0) {
 981                 isl_space *dim = isl_space_copy(pw->dim);
 982                 FN(PW,free)(pw);
 983                 return isl_qpolynomial_zero_on_domain(dim);
 984         }
 985
 986         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
 987                                         isl_set_copy(pw->p[0].set), max);
 988         for (i = 1; i < pw->n; ++i) {
 989                 isl_qpolynomial *opt_i;
 990                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
 991                                                 isl_set_copy(pw->p[i].set), max);
 992                 if (max)
 993                         opt = isl_qpolynomial_max_cst(opt, opt_i);
 994                 else
 995                         opt = isl_qpolynomial_min_cst(opt, opt_i);
 996         }
 997
 998         FN(PW,free)(pw);
 999         return opt;
1000 }
1001
1002 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
1003 {
1004         return FN(PW,opt)(pw, 1);
1005 }
1006
1007 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
1008 {
1009         return FN(PW,opt)(pw, 0);
1010 }
1011 #endif
1012
1013 __isl_give isl_space *FN(PW,get_space)(__isl_keep PW *pw)
1014 {
1015         return pw ? isl_space_copy(pw->dim) : NULL;
1016 }
1017
1018 __isl_give isl_space *FN(PW,get_domain_space)(__isl_keep PW *pw)
1019 {
1020         return pw ? isl_space_domain(isl_space_copy(pw->dim)) : NULL;
1021 }
1022
1023 #ifndef NO_RESET_DIM
1024 /* Reset the space of "pw".  Since we don't know if the elements
1025  * represent the spaces themselves or their domains, we pass along
1026  * both when we call their reset_space_and_domain.
1027  */
1028 static __isl_give PW *FN(PW,reset_space_and_domain)(__isl_take PW *pw,
1029         __isl_take isl_space *space, __isl_take isl_space *domain)
1030 {
1031         int i;
1032
1033         pw = FN(PW,cow)(pw);
1034         if (!pw || !space || !domain)
1035                 goto error;
1036
1037         for (i = 0; i < pw->n; ++i) {
1038                 pw->p[i].set = isl_set_reset_space(pw->p[i].set,
1039                                                  isl_space_copy(domain));
1040                 if (!pw->p[i].set)
1041                         goto error;
1042                 pw->p[i].FIELD = FN(EL,reset_space_and_domain)(pw->p[i].FIELD,
1043                               isl_space_copy(space), isl_space_copy(domain));
1044                 if (!pw->p[i].FIELD)
1045                         goto error;
1046         }
1047
1048         isl_space_free(domain);
1049
1050         isl_space_free(pw->dim);
1051         pw->dim = space;
1052
1053         return pw;
1054 error:
1055         isl_space_free(domain);
1056         isl_space_free(space);
1057         FN(PW,free)(pw);
1058         return NULL;
1059 }
1060
1061 __isl_give PW *FN(PW,reset_domain_space)(__isl_take PW *pw,
1062         __isl_take isl_space *domain)
1063 {
1064         isl_space *space;
1065
1066         space = isl_space_extend_domain_with_range(isl_space_copy(domain),
1067                                                    FN(PW,get_space)(pw));
1068         return FN(PW,reset_space_and_domain)(pw, space, domain);
1069 }
1070
1071 __isl_give PW *FN(PW,reset_space)(__isl_take PW *pw, __isl_take isl_space *dim)
1072 {
1073         isl_space *domain;
1074
1075         domain = isl_space_domain(isl_space_copy(dim));
1076         return FN(PW,reset_space_and_domain)(pw, dim, domain);
1077 }
1078
1079 __isl_give PW *FN(PW,set_tuple_id)(__isl_keep PW *pw, enum isl_dim_type type,
1080         __isl_take isl_id *id)
1081 {
1082         isl_space *space;
1083
1084         pw = FN(PW,cow)(pw);
1085         if (!pw)
1086                 return isl_id_free(id);
1087
1088         space = FN(PW,get_space)(pw);
1089         space = isl_space_set_tuple_id(space, type, id);
1090
1091         return FN(PW,reset_space)(pw, space);
1092 }
1093 #endif
1094
1095 int FN(PW,has_equal_space)(__isl_keep PW *pw1, __isl_keep PW *pw2)
1096 {
1097         if (!pw1 || !pw2)
1098                 return -1;
1099
1100         return isl_space_is_equal(pw1->dim, pw2->dim);
1101 }
1102
1103 #ifndef NO_MORPH
1104 __isl_give PW *FN(PW,morph_domain)(__isl_take PW *pw,
1105         __isl_take isl_morph *morph)
1106 {
1107         int i;
1108         isl_ctx *ctx;
1109
1110         if (!pw || !morph)
1111                 goto error;
1112
1113         ctx = isl_space_get_ctx(pw->dim);
1114         isl_assert(ctx, isl_space_is_domain(morph->dom->dim, pw->dim),
1115                 goto error);
1116
1117         pw = FN(PW,cow)(pw);
1118         if (!pw)
1119                 goto error;
1120         pw->dim = isl_space_extend_domain_with_range(
1121                         isl_space_copy(morph->ran->dim), pw->dim);
1122         if (!pw->dim)
1123                 goto error;
1124
1125         for (i = 0; i < pw->n; ++i) {
1126                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
1127                 if (!pw->p[i].set)
1128                         goto error;
1129                 pw->p[i].FIELD = FN(EL,morph_domain)(pw->p[i].FIELD,
1130                                                 isl_morph_copy(morph));
1131                 if (!pw->p[i].FIELD)
1132                         goto error;
1133         }
1134
1135         isl_morph_free(morph);
1136
1137         return pw;
1138 error:
1139         FN(PW,free)(pw);
1140         isl_morph_free(morph);
1141         return NULL;
1142 }
1143 #endif
1144
1145 int FN(PW,foreach_piece)(__isl_keep PW *pw,
1146         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
1147         void *user)
1148 {
1149         int i;
1150
1151         if (!pw)
1152                 return -1;
1153
1154         for (i = 0; i < pw->n; ++i)
1155                 if (fn(isl_set_copy(pw->p[i].set),
1156                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
1157                         return -1;
1158
1159         return 0;
1160 }
1161
1162 #ifndef NO_LIFT
1163 static int any_divs(__isl_keep isl_set *set)
1164 {
1165         int i;
1166
1167         if (!set)
1168                 return -1;
1169
1170         for (i = 0; i < set->n; ++i)
1171                 if (set->p[i]->n_div > 0)
1172                         return 1;
1173
1174         return 0;
1175 }
1176
1177 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
1178         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
1179                     void *user), void *user)
1180 {
1181         int i;
1182
1183         if (!set || !el)
1184                 goto error;
1185
1186         for (i = 0; i < set->n; ++i) {
1187                 isl_set *lift;
1188                 EL *copy;
1189
1190                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
1191                 lift = isl_set_lift(lift);
1192
1193                 copy = FN(EL,copy)(el);
1194                 copy = FN(EL,lift)(copy, isl_set_get_space(lift));
1195
1196                 if (fn(lift, copy, user) < 0)
1197                         goto error;
1198         }
1199
1200         isl_set_free(set);
1201         FN(EL,free)(el);
1202
1203         return 0;
1204 error:
1205         isl_set_free(set);
1206         FN(EL,free)(el);
1207         return -1;
1208 }
1209
1210 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
1211         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
1212                     void *user), void *user)
1213 {
1214         int i;
1215
1216         if (!pw)
1217                 return -1;
1218
1219         for (i = 0; i < pw->n; ++i) {
1220                 isl_set *set;
1221                 EL *el;
1222
1223                 set = isl_set_copy(pw->p[i].set);
1224                 el = FN(EL,copy)(pw->p[i].FIELD);
1225                 if (!any_divs(set)) {
1226                         if (fn(set, el, user) < 0)
1227                                 return -1;
1228                         continue;
1229                 }
1230                 if (foreach_lifted_subset(set, el, fn, user) < 0)
1231                         return -1;
1232         }
1233
1234         return 0;
1235 }
1236 #endif
1237
1238 #ifndef NO_MOVE_DIMS
1239 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
1240         enum isl_dim_type dst_type, unsigned dst_pos,
1241         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
1242 {
1243         int i;
1244
1245         pw = FN(PW,cow)(pw);
1246         if (!pw)
1247                 return NULL;
1248
1249         pw->dim = isl_space_move_dims(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
1250         if (!pw->dim)
1251                 goto error;
1252
1253         for (i = 0; i < pw->n; ++i) {
1254                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
1255                                         dst_type, dst_pos, src_type, src_pos, n);
1256                 if (!pw->p[i].FIELD)
1257                         goto error;
1258         }
1259
1260         if (dst_type == isl_dim_in)
1261                 dst_type = isl_dim_set;
1262         if (src_type == isl_dim_in)
1263                 src_type = isl_dim_set;
1264
1265         for (i = 0; i < pw->n; ++i) {
1266                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
1267                                                 dst_type, dst_pos,
1268                                                 src_type, src_pos, n);
1269                 if (!pw->p[i].set)
1270                         goto error;
1271         }
1272
1273         return pw;
1274 error:
1275         FN(PW,free)(pw);
1276         return NULL;
1277 }
1278 #endif
1279
1280 __isl_give PW *FN(PW,mul_isl_int)(__isl_take PW *pw, isl_int v)
1281 {
1282         int i;
1283
1284         if (isl_int_is_one(v))
1285                 return pw;
1286         if (pw && isl_int_is_zero(v)) {
1287                 PW *zero;
1288                 isl_space *dim = FN(PW,get_space)(pw);
1289 #ifdef HAS_TYPE
1290                 zero = FN(PW,ZERO)(dim, pw->type);
1291 #else
1292                 zero = FN(PW,ZERO)(dim);
1293 #endif
1294                 FN(PW,free)(pw);
1295                 return zero;
1296         }
1297         pw = FN(PW,cow)(pw);
1298         if (!pw)
1299                 return NULL;
1300         if (pw->n == 0)
1301                 return pw;
1302
1303 #ifdef HAS_TYPE
1304         if (isl_int_is_neg(v))
1305                 pw->type = isl_fold_type_negate(pw->type);
1306 #endif
1307         for (i = 0; i < pw->n; ++i) {
1308                 pw->p[i].FIELD = FN(EL,scale)(pw->p[i].FIELD, v);
1309                 if (!pw->p[i].FIELD)
1310                         goto error;
1311         }
1312
1313         return pw;
1314 error:
1315         FN(PW,free)(pw);
1316         return NULL;
1317 }
1318
1319 __isl_give PW *FN(PW,scale)(__isl_take PW *pw, isl_int v)
1320 {
1321         return FN(PW,mul_isl_int)(pw, v);
1322 }
1323
1324 static int FN(PW,qsort_set_cmp)(const void *p1, const void *p2)
1325 {
1326         const isl_set *set1 = *(const isl_set **)p1;
1327         const isl_set *set2 = *(const isl_set **)p2;
1328
1329         return isl_set_plain_cmp(set1, set2);
1330 }
1331
1332 /* We normalize in place, but if anything goes wrong we need
1333  * to return NULL, so we need to make sure we don't change the
1334  * meaning of any possible other copies of map.
1335  */
1336 __isl_give PW *FN(PW,normalize)(__isl_take PW *pw)
1337 {
1338         int i, j;
1339         isl_set *set;
1340
1341         if (!pw)
1342                 return NULL;
1343         for (i = 0; i < pw->n; ++i) {
1344                 set = isl_set_normalize(isl_set_copy(pw->p[i].set));
1345                 if (!set)
1346                         return FN(PW,free)(pw);
1347                 isl_set_free(pw->p[i].set);
1348                 pw->p[i].set = set;
1349         }
1350         qsort(pw->p, pw->n, sizeof(pw->p[0]), &FN(PW,qsort_set_cmp));
1351         for (i = pw->n - 1; i >= 1; --i) {
1352                 if (!isl_set_plain_is_equal(pw->p[i - 1].set, pw->p[i].set))
1353                         continue;
1354                 if (!FN(EL,plain_is_equal)(pw->p[i - 1].FIELD, pw->p[i].FIELD))
1355                         continue;
1356                 set = isl_set_union(isl_set_copy(pw->p[i - 1].set),
1357                                     isl_set_copy(pw->p[i].set));
1358                 if (!set)
1359                         return FN(PW,free)(pw);
1360                 isl_set_free(pw->p[i].set);
1361                 FN(EL,free)(pw->p[i].FIELD);
1362                 isl_set_free(pw->p[i - 1].set);
1363                 pw->p[i - 1].set = set;
1364                 for (j = i + 1; j < pw->n; ++j)
1365                         pw->p[j - 1] = pw->p[j];
1366                 pw->n--;
1367         }
1368
1369         return pw;
1370 }
1371
1372 /* Is pw1 obviously equal to pw2?
1373  * That is, do they have obviously identical cells and obviously identical
1374  * elements on each cell?
1375  */
1376 int FN(PW,plain_is_equal)(__isl_keep PW *pw1, __isl_keep PW *pw2)
1377 {
1378         int i;
1379         int equal;
1380
1381         if (!pw1 || !pw2)
1382                 return -1;
1383
1384         if (pw1 == pw2)
1385                 return 1;
1386         if (!isl_space_is_equal(pw1->dim, pw2->dim))
1387                 return 0;
1388
1389         pw1 = FN(PW,copy)(pw1);
1390         pw2 = FN(PW,copy)(pw2);
1391         pw1 = FN(PW,normalize)(pw1);
1392         pw2 = FN(PW,normalize)(pw2);
1393         if (!pw1 || !pw2)
1394                 goto error;
1395
1396         equal = pw1->n == pw2->n;
1397         for (i = 0; equal && i < pw1->n; ++i) {
1398                 equal = isl_set_plain_is_equal(pw1->p[i].set, pw2->p[i].set);
1399                 if (equal < 0)
1400                         goto error;
1401                 if (!equal)
1402                         break;
1403                 equal = FN(EL,plain_is_equal)(pw1->p[i].FIELD, pw2->p[i].FIELD);
1404                 if (equal < 0)
1405                         goto error;
1406         }
1407
1408         FN(PW,free)(pw1);
1409         FN(PW,free)(pw2);
1410         return equal;
1411 error:
1412         FN(PW,free)(pw1);
1413         FN(PW,free)(pw2);
1414         return -1;
1415 }