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 const char *FN(PW,get_tuple_name)(__isl_keep PW *pw, enum isl_dim_type type)
 177 {
 178         return pw ? isl_space_get_tuple_name(pw->dim, type) : NULL;
 179 }
 180
 181 int FN(PW,IS_ZERO)(__isl_keep PW *pw)
 182 {
 183         if (!pw)
 184                 return -1;
 185
 186         return pw->n == 0;
 187 }
 188
 189 #ifndef NO_REALIGN
 190 __isl_give PW *FN(PW,realign_domain)(__isl_take PW *pw,
 191         __isl_take isl_reordering *exp)
 192 {
 193         int i;
 194
 195         pw = FN(PW,cow)(pw);
 196         if (!pw || !exp)
 197                 return NULL;
 198
 199         for (i = 0; i < pw->n; ++i) {
 200                 pw->p[i].set = isl_set_realign(pw->p[i].set,
 201                                                     isl_reordering_copy(exp));
 202                 if (!pw->p[i].set)
 203                         goto error;
 204                 pw->p[i].FIELD = FN(EL,realign_domain)(pw->p[i].FIELD,
 205                                                     isl_reordering_copy(exp));
 206                 if (!pw->p[i].FIELD)
 207                         goto error;
 208         }
 209
 210         pw = FN(PW,reset_domain_space)(pw, isl_space_copy(exp->dim));
 211
 212         isl_reordering_free(exp);
 213         return pw;
 214 error:
 215         isl_reordering_free(exp);
 216         FN(PW,free)(pw);
 217         return NULL;
 218 }
 219
 220 /* Align the parameters of "pw" to those of "model".
 221  */
 222 __isl_give PW *FN(PW,align_params)(__isl_take PW *pw, __isl_take isl_space *model)
 223 {
 224         isl_ctx *ctx;
 225
 226         if (!pw || !model)
 227                 goto error;
 228
 229         ctx = isl_space_get_ctx(model);
 230         if (!isl_space_has_named_params(model))
 231                 isl_die(ctx, isl_error_invalid,
 232                         "model has unnamed parameters", goto error);
 233         if (!isl_space_has_named_params(pw->dim))
 234                 isl_die(ctx, isl_error_invalid,
 235                         "input has unnamed parameters", goto error);
 236         if (!isl_space_match(pw->dim, isl_dim_param, model, isl_dim_param)) {
 237                 isl_reordering *exp;
 238
 239                 model = isl_space_drop_dims(model, isl_dim_in,
 240                                         0, isl_space_dim(model, isl_dim_in));
 241                 model = isl_space_drop_dims(model, isl_dim_out,
 242                                         0, isl_space_dim(model, isl_dim_out));
 243                 exp = isl_parameter_alignment_reordering(pw->dim, model);
 244                 exp = isl_reordering_extend_space(exp,
 245                                         FN(PW,get_domain_space)(pw));
 246                 pw = FN(PW,realign_domain)(pw, exp);
 247         }
 248
 249         isl_space_free(model);
 250         return pw;
 251 error:
 252         isl_space_free(model);
 253         FN(PW,free)(pw);
 254         return NULL;
 255 }
 256
 257 static __isl_give PW *FN(PW,align_params_pw_pw_and)(__isl_take PW *pw1,
 258         __isl_take PW *pw2,
 259         __isl_give PW *(*fn)(__isl_take PW *pw1, __isl_take PW *pw2))
 260 {
 261         isl_ctx *ctx;
 262
 263         if (!pw1 || !pw2)
 264                 goto error;
 265         if (isl_space_match(pw1->dim, isl_dim_param, pw2->dim, isl_dim_param))
 266                 return fn(pw1, pw2);
 267         ctx = FN(PW,get_ctx)(pw1);
 268         if (!isl_space_has_named_params(pw1->dim) ||
 269             !isl_space_has_named_params(pw2->dim))
 270                 isl_die(ctx, isl_error_invalid,
 271                         "unaligned unnamed parameters", goto error);
 272         pw1 = FN(PW,align_params)(pw1, FN(PW,get_space)(pw2));
 273         pw2 = FN(PW,align_params)(pw2, FN(PW,get_space)(pw1));
 274         return fn(pw1, pw2);
 275 error:
 276         FN(PW,free)(pw1);
 277         FN(PW,free)(pw2);
 278         return NULL;
 279 }
 280
 281 static __isl_give PW *FN(PW,align_params_pw_set_and)(__isl_take PW *pw,
 282         __isl_take isl_set *set,
 283         __isl_give PW *(*fn)(__isl_take PW *pw, __isl_take isl_set *set))
 284 {
 285         isl_ctx *ctx;
 286
 287         if (!pw || !set)
 288                 goto error;
 289         if (isl_space_match(pw->dim, isl_dim_param, set->dim, isl_dim_param))
 290                 return fn(pw, set);
 291         ctx = FN(PW,get_ctx)(pw);
 292         if (!isl_space_has_named_params(pw->dim) ||
 293             !isl_space_has_named_params(set->dim))
 294                 isl_die(ctx, isl_error_invalid,
 295                         "unaligned unnamed parameters", goto error);
 296         pw = FN(PW,align_params)(pw, isl_set_get_space(set));
 297         set = isl_set_align_params(set, FN(PW,get_space)(pw));
 298         return fn(pw, set);
 299 error:
 300         FN(PW,free)(pw);
 301         isl_set_free(set);
 302         return NULL;
 303 }
 304 #endif
 305
 306 static __isl_give PW *FN(PW,add_aligned)(__isl_take PW *pw1, __isl_take PW *pw2)
 307 {
 308         int i, j, n;
 309         struct PW *res;
 310         isl_ctx *ctx;
 311         isl_set *set;
 312
 313         if (!pw1 || !pw2)
 314                 goto error;
 315
 316         ctx = isl_space_get_ctx(pw1->dim);
 317 #ifdef HAS_TYPE
 318         if (pw1->type != pw2->type)
 319                 isl_die(ctx, isl_error_invalid,
 320                         "fold types don't match", goto error);
 321 #endif
 322         isl_assert(ctx, isl_space_is_equal(pw1->dim, pw2->dim), goto error);
 323
 324         if (FN(PW,IS_ZERO)(pw1)) {
 325                 FN(PW,free)(pw1);
 326                 return pw2;
 327         }
 328
 329         if (FN(PW,IS_ZERO)(pw2)) {
 330                 FN(PW,free)(pw2);
 331                 return pw1;
 332         }
 333
 334         n = (pw1->n + 1) * (pw2->n + 1);
 335 #ifdef HAS_TYPE
 336         res = FN(PW,alloc_size)(isl_space_copy(pw1->dim), pw1->type, n);
 337 #else
 338         res = FN(PW,alloc_size)(isl_space_copy(pw1->dim), n);
 339 #endif
 340
 341         for (i = 0; i < pw1->n; ++i) {
 342                 set = isl_set_copy(pw1->p[i].set);
 343                 for (j = 0; j < pw2->n; ++j) {
 344                         struct isl_set *common;
 345                         EL *sum;
 346                         set = isl_set_subtract(set,
 347                                         isl_set_copy(pw2->p[j].set));
 348                         common = isl_set_intersect(isl_set_copy(pw1->p[i].set),
 349                                                 isl_set_copy(pw2->p[j].set));
 350                         if (isl_set_plain_is_empty(common)) {
 351                                 isl_set_free(common);
 352                                 continue;
 353                         }
 354
 355                         sum = FN(EL,add_on_domain)(common,
 356                                                    FN(EL,copy)(pw1->p[i].FIELD),
 357                                                    FN(EL,copy)(pw2->p[j].FIELD));
 358
 359                         res = FN(PW,add_piece)(res, common, sum);
 360                 }
 361                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw1->p[i].FIELD));
 362         }
 363
 364         for (j = 0; j < pw2->n; ++j) {
 365                 set = isl_set_copy(pw2->p[j].set);
 366                 for (i = 0; i < pw1->n; ++i)
 367                         set = isl_set_subtract(set,
 368                                         isl_set_copy(pw1->p[i].set));
 369                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw2->p[j].FIELD));
 370         }
 371
 372         FN(PW,free)(pw1);
 373         FN(PW,free)(pw2);
 374
 375         return res;
 376 error:
 377         FN(PW,free)(pw1);
 378         FN(PW,free)(pw2);
 379         return NULL;
 380 }
 381
 382 __isl_give PW *FN(PW,add)(__isl_take PW *pw1, __isl_take PW *pw2)
 383 {
 384         return FN(PW,align_params_pw_pw_and)(pw1, pw2, &FN(PW,add_aligned));
 385 }
 386
 387 /* Make sure "pw" has room for at least "n" more pieces.
 388  *
 389  * If there is only one reference to pw, we extend it in place.
 390  * Otherwise, we create a new PW and copy the pieces.
 391  */
 392 static __isl_give PW *FN(PW,grow)(__isl_take PW *pw, int n)
 393 {
 394         int i;
 395         isl_ctx *ctx;
 396         PW *res;
 397
 398         if (!pw)
 399                 return NULL;
 400         if (pw->n + n <= pw->size)
 401                 return pw;
 402         ctx = FN(PW,get_ctx)(pw);
 403         n += pw->n;
 404         if (pw->ref == 1) {
 405                 res = isl_realloc(ctx, pw, struct PW,
 406                             sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
 407                 if (!res)
 408                         return FN(PW,free)(pw);
 409                 res->size = n;
 410                 return res;
 411         }
 412 #ifdef HAS_TYPE
 413         res = FN(PW,alloc_size)(isl_space_copy(pw->dim), pw->type, n);
 414 #else
 415         res = FN(PW,alloc_size)(isl_space_copy(pw->dim), n);
 416 #endif
 417         if (!res)
 418                 return FN(PW,free)(pw);
 419         for (i = 0; i < pw->n; ++i)
 420                 res = FN(PW,add_piece)(res, isl_set_copy(pw->p[i].set),
 421                                             FN(EL,copy)(pw->p[i].FIELD));
 422         FN(PW,free)(pw);
 423         return res;
 424 }
 425
 426 static __isl_give PW *FN(PW,add_disjoint_aligned)(__isl_take PW *pw1,
 427         __isl_take PW *pw2)
 428 {
 429         int i;
 430         isl_ctx *ctx;
 431
 432         if (!pw1 || !pw2)
 433                 goto error;
 434
 435         if (pw1->size < pw1->n + pw2->n && pw1->n < pw2->n)
 436                 return FN(PW,add_disjoint_aligned)(pw2, pw1);
 437
 438         ctx = isl_space_get_ctx(pw1->dim);
 439 #ifdef HAS_TYPE
 440         if (pw1->type != pw2->type)
 441                 isl_die(ctx, isl_error_invalid,
 442                         "fold types don't match", goto error);
 443 #endif
 444         isl_assert(ctx, isl_space_is_equal(pw1->dim, pw2->dim), goto error);
 445
 446         if (FN(PW,IS_ZERO)(pw1)) {
 447                 FN(PW,free)(pw1);
 448                 return pw2;
 449         }
 450
 451         if (FN(PW,IS_ZERO)(pw2)) {
 452                 FN(PW,free)(pw2);
 453                 return pw1;
 454         }
 455
 456         pw1 = FN(PW,grow)(pw1, pw2->n);
 457         if (!pw1)
 458                 goto error;
 459
 460         for (i = 0; i < pw2->n; ++i)
 461                 pw1 = FN(PW,add_piece)(pw1,
 462                                 isl_set_copy(pw2->p[i].set),
 463                                 FN(EL,copy)(pw2->p[i].FIELD));
 464
 465         FN(PW,free)(pw2);
 466
 467         return pw1;
 468 error:
 469         FN(PW,free)(pw1);
 470         FN(PW,free)(pw2);
 471         return NULL;
 472 }
 473
 474 __isl_give PW *FN(PW,add_disjoint)(__isl_take PW *pw1, __isl_take PW *pw2)
 475 {
 476         return FN(PW,align_params_pw_pw_and)(pw1, pw2,
 477                                                 &FN(PW,add_disjoint_aligned));
 478 }
 479
 480 #ifndef NO_NEG
 481 __isl_give PW *FN(PW,neg)(__isl_take PW *pw)
 482 {
 483         int i;
 484
 485         if (!pw)
 486                 return NULL;
 487
 488         if (FN(PW,IS_ZERO)(pw))
 489                 return pw;
 490
 491         pw = FN(PW,cow)(pw);
 492         if (!pw)
 493                 return NULL;
 494
 495         for (i = 0; i < pw->n; ++i) {
 496                 pw->p[i].FIELD = FN(EL,neg)(pw->p[i].FIELD);
 497                 if (!pw->p[i].FIELD)
 498                         return FN(PW,free)(pw);
 499         }
 500
 501         return pw;
 502 }
 503
 504 __isl_give PW *FN(PW,sub)(__isl_take PW *pw1, __isl_take PW *pw2)
 505 {
 506         return FN(PW,add)(pw1, FN(PW,neg)(pw2));
 507 }
 508 #endif
 509
 510 #ifndef NO_EVAL
 511 __isl_give isl_qpolynomial *FN(PW,eval)(__isl_take PW *pw,
 512         __isl_take isl_point *pnt)
 513 {
 514         int i;
 515         int found = 0;
 516         isl_ctx *ctx;
 517         isl_space *pnt_dim = NULL;
 518         isl_qpolynomial *qp;
 519
 520         if (!pw || !pnt)
 521                 goto error;
 522         ctx = isl_point_get_ctx(pnt);
 523         pnt_dim = isl_point_get_space(pnt);
 524         isl_assert(ctx, isl_space_is_domain(pnt_dim, pw->dim), goto error);
 525
 526         for (i = 0; i < pw->n; ++i) {
 527                 found = isl_set_contains_point(pw->p[i].set, pnt);
 528                 if (found < 0)
 529                         goto error;
 530                 if (found)
 531                         break;
 532         }
 533         if (found)
 534                 qp = FN(EL,eval)(FN(EL,copy)(pw->p[i].FIELD),
 535                                             isl_point_copy(pnt));
 536         else
 537                 qp = isl_qpolynomial_zero_on_domain(FN(PW,get_domain_space)(pw));
 538         FN(PW,free)(pw);
 539         isl_space_free(pnt_dim);
 540         isl_point_free(pnt);
 541         return qp;
 542 error:
 543         FN(PW,free)(pw);
 544         isl_space_free(pnt_dim);
 545         isl_point_free(pnt);
 546         return NULL;
 547 }
 548 #endif
 549
 550 __isl_give isl_set *FN(PW,domain)(__isl_take PW *pw)
 551 {
 552         int i;
 553         isl_set *dom;
 554
 555         if (!pw)
 556                 return NULL;
 557
 558         dom = isl_set_empty(FN(PW,get_domain_space)(pw));
 559         for (i = 0; i < pw->n; ++i)
 560                 dom = isl_set_union_disjoint(dom, isl_set_copy(pw->p[i].set));
 561
 562         FN(PW,free)(pw);
 563
 564         return dom;
 565 }
 566
 567 static __isl_give PW *FN(PW,intersect_domain_aligned)(__isl_take PW *pw,
 568         __isl_take isl_set *set)
 569 {
 570         int i;
 571
 572         if (!pw || !set)
 573                 goto error;
 574
 575         if (pw->n == 0) {
 576                 isl_set_free(set);
 577                 return pw;
 578         }
 579
 580         pw = FN(PW,cow)(pw);
 581         if (!pw)
 582                 goto error;
 583
 584         for (i = pw->n - 1; i >= 0; --i) {
 585                 isl_basic_set *aff;
 586                 pw->p[i].set = isl_set_intersect(pw->p[i].set, isl_set_copy(set));
 587                 if (!pw->p[i].set)
 588                         goto error;
 589                 aff = isl_set_affine_hull(isl_set_copy(pw->p[i].set));
 590                 pw->p[i].FIELD = FN(EL,substitute_equalities)(pw->p[i].FIELD,
 591                                                                 aff);
 592                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 593                         isl_set_free(pw->p[i].set);
 594                         FN(EL,free)(pw->p[i].FIELD);
 595                         if (i != pw->n - 1)
 596                                 pw->p[i] = pw->p[pw->n - 1];
 597                         pw->n--;
 598                 }
 599         }
 600
 601         isl_set_free(set);
 602         return pw;
 603 error:
 604         isl_set_free(set);
 605         FN(PW,free)(pw);
 606         return NULL;
 607 }
 608
 609 __isl_give PW *FN(PW,intersect_domain)(__isl_take PW *pw,
 610         __isl_take isl_set *context)
 611 {
 612         return FN(PW,align_params_pw_set_and)(pw, context,
 613                                         &FN(PW,intersect_domain_aligned));
 614 }
 615
 616 static __isl_give PW *FN(PW,gist_aligned)(__isl_take PW *pw,
 617         __isl_take isl_set *context)
 618 {
 619         int i;
 620         isl_basic_set *hull = NULL;
 621
 622         if (!pw || !context)
 623                 goto error;
 624
 625         if (pw->n == 0) {
 626                 isl_set_free(context);
 627                 return pw;
 628         }
 629
 630         if (!isl_space_match(pw->dim, isl_dim_param,
 631                                 context->dim, isl_dim_param)) {
 632                 pw = FN(PW,align_params)(pw, isl_set_get_space(context));
 633                 context = isl_set_align_params(context, FN(PW,get_space)(pw));
 634         }
 635
 636         context = isl_set_compute_divs(context);
 637         hull = isl_set_simple_hull(isl_set_copy(context));
 638
 639         pw = FN(PW,cow)(pw);
 640         if (!pw)
 641                 goto error;
 642
 643         for (i = pw->n - 1; i >= 0; --i) {
 644                 pw->p[i].set = isl_set_intersect(pw->p[i].set,
 645                                                  isl_set_copy(context));
 646                 if (!pw->p[i].set)
 647                         goto error;
 648                 pw->p[i].FIELD = FN(EL,gist)(pw->p[i].FIELD,
 649                                              isl_set_copy(pw->p[i].set));
 650                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 651                                                 isl_basic_set_copy(hull));
 652                 if (!pw->p[i].set)
 653                         goto error;
 654                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 655                         isl_set_free(pw->p[i].set);
 656                         FN(EL,free)(pw->p[i].FIELD);
 657                         if (i != pw->n - 1)
 658                                 pw->p[i] = pw->p[pw->n - 1];
 659                         pw->n--;
 660                 }
 661         }
 662
 663         isl_basic_set_free(hull);
 664         isl_set_free(context);
 665
 666         return pw;
 667 error:
 668         FN(PW,free)(pw);
 669         isl_basic_set_free(hull);
 670         isl_set_free(context);
 671         return NULL;
 672 }
 673
 674 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
 675 {
 676         return FN(PW,align_params_pw_set_and)(pw, context, &FN(PW,gist_aligned));
 677 }
 678
 679 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 680 {
 681         int i, j;
 682
 683         if (!pw)
 684                 return NULL;
 685         if (pw->n == 0)
 686                 return pw;
 687
 688         for (i = pw->n - 1; i >= 0; --i) {
 689                 for (j = i - 1; j >= 0; --j) {
 690                         if (!FN(EL,plain_is_equal)(pw->p[i].FIELD,
 691                                                         pw->p[j].FIELD))
 692                                 continue;
 693                         pw->p[j].set = isl_set_union(pw->p[j].set,
 694                                                         pw->p[i].set);
 695                         FN(EL,free)(pw->p[i].FIELD);
 696                         if (i != pw->n - 1)
 697                                 pw->p[i] = pw->p[pw->n - 1];
 698                         pw->n--;
 699                         break;
 700                 }
 701                 if (j >= 0)
 702                         continue;
 703                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 704                 if (!pw->p[i].set)
 705                         goto error;
 706         }
 707
 708         return pw;
 709 error:
 710         FN(PW,free)(pw);
 711         return NULL;
 712 }
 713
 714 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 715 {
 716         return pw ? isl_space_get_ctx(pw->dim) : NULL;
 717 }
 718
 719 #ifndef NO_INVOLVES_DIMS
 720 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 721         unsigned first, unsigned n)
 722 {
 723         int i;
 724         enum isl_dim_type set_type;
 725
 726         if (!pw)
 727                 return -1;
 728         if (pw->n == 0 || n == 0)
 729                 return 0;
 730
 731         set_type = type == isl_dim_in ? isl_dim_set : type;
 732
 733         for (i = 0; i < pw->n; ++i) {
 734                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 735                                                         type, first, n);
 736                 if (involves < 0 || involves)
 737                         return involves;
 738                 involves = isl_set_involves_dims(pw->p[i].set,
 739                                                         set_type, first, n);
 740                 if (involves < 0 || involves)
 741                         return involves;
 742         }
 743         return 0;
 744 }
 745 #endif
 746
 747 __isl_give PW *FN(PW,set_dim_name)(__isl_take PW *pw,
 748         enum isl_dim_type type, unsigned pos, const char *s)
 749 {
 750         int i;
 751         enum isl_dim_type set_type;
 752
 753         pw = FN(PW,cow)(pw);
 754         if (!pw)
 755                 return NULL;
 756
 757         set_type = type == isl_dim_in ? isl_dim_set : type;
 758
 759         pw->dim = isl_space_set_dim_name(pw->dim, type, pos, s);
 760         if (!pw->dim)
 761                 goto error;
 762
 763         for (i = 0; i < pw->n; ++i) {
 764                 pw->p[i].set = isl_set_set_dim_name(pw->p[i].set,
 765                                                         set_type, pos, s);
 766                 if (!pw->p[i].set)
 767                         goto error;
 768                 pw->p[i].FIELD = FN(EL,set_dim_name)(pw->p[i].FIELD, type, pos, s);
 769                 if (!pw->p[i].FIELD)
 770                         goto error;
 771         }
 772
 773         return pw;
 774 error:
 775         FN(PW,free)(pw);
 776         return NULL;
 777 }
 778
 779 #ifndef NO_DROP_DIMS
 780 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 781         enum isl_dim_type type, unsigned first, unsigned n)
 782 {
 783         int i;
 784         enum isl_dim_type set_type;
 785
 786         if (!pw)
 787                 return NULL;
 788         if (n == 0 && !isl_space_get_tuple_name(pw->dim, type))
 789                 return pw;
 790
 791         set_type = type == isl_dim_in ? isl_dim_set : type;
 792
 793         pw = FN(PW,cow)(pw);
 794         if (!pw)
 795                 return NULL;
 796         pw->dim = isl_space_drop_dims(pw->dim, type, first, n);
 797         if (!pw->dim)
 798                 goto error;
 799         for (i = 0; i < pw->n; ++i) {
 800                 pw->p[i].set = isl_set_drop(pw->p[i].set, set_type, first, n);
 801                 if (!pw->p[i].set)
 802                         goto error;
 803                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 804                 if (!pw->p[i].FIELD)
 805                         goto error;
 806         }
 807
 808         return pw;
 809 error:
 810         FN(PW,free)(pw);
 811         return NULL;
 812 }
 813
 814 /* This function is very similar to drop_dims.
 815  * The only difference is that the cells may still involve
 816  * the specified dimensions.  They are removed using
 817  * isl_set_project_out instead of isl_set_drop.
 818  */
 819 __isl_give PW *FN(PW,project_out)(__isl_take PW *pw,
 820         enum isl_dim_type type, unsigned first, unsigned n)
 821 {
 822         int i;
 823         enum isl_dim_type set_type;
 824
 825         if (!pw)
 826                 return NULL;
 827         if (n == 0 && !isl_space_get_tuple_name(pw->dim, type))
 828                 return pw;
 829
 830         set_type = type == isl_dim_in ? isl_dim_set : type;
 831
 832         pw = FN(PW,cow)(pw);
 833         if (!pw)
 834                 return NULL;
 835         pw->dim = isl_space_drop_dims(pw->dim, type, first, n);
 836         if (!pw->dim)
 837                 goto error;
 838         for (i = 0; i < pw->n; ++i) {
 839                 pw->p[i].set = isl_set_project_out(pw->p[i].set,
 840                                                         set_type, first, n);
 841                 if (!pw->p[i].set)
 842                         goto error;
 843                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 844                 if (!pw->p[i].FIELD)
 845                         goto error;
 846         }
 847
 848         return pw;
 849 error:
 850         FN(PW,free)(pw);
 851         return NULL;
 852 }
 853
 854 /* Project the domain of pw onto its parameter space.
 855  */
 856 __isl_give PW *FN(PW,project_domain_on_params)(__isl_take PW *pw)
 857 {
 858         isl_space *space;
 859         unsigned n;
 860
 861         n = FN(PW,dim)(pw, isl_dim_in);
 862         pw = FN(PW,project_out)(pw, isl_dim_in, 0, n);
 863         space = FN(PW,get_domain_space)(pw);
 864         space = isl_space_params(space);
 865         pw = FN(PW,reset_domain_space)(pw, space);
 866         return pw;
 867 }
 868 #endif
 869
 870 #ifndef NO_INSERT_DIMS
 871 __isl_give PW *FN(PW,insert_dims)(__isl_take PW *pw, enum isl_dim_type type,
 872         unsigned first, unsigned n)
 873 {
 874         int i;
 875         enum isl_dim_type set_type;
 876
 877         if (!pw)
 878                 return NULL;
 879         if (n == 0 && !isl_space_is_named_or_nested(pw->dim, type))
 880                 return pw;
 881
 882         set_type = type == isl_dim_in ? isl_dim_set : type;
 883
 884         pw = FN(PW,cow)(pw);
 885         if (!pw)
 886                 return NULL;
 887
 888         pw->dim = isl_space_insert_dims(pw->dim, type, first, n);
 889         if (!pw->dim)
 890                 goto error;
 891
 892         for (i = 0; i < pw->n; ++i) {
 893                 pw->p[i].set = isl_set_insert_dims(pw->p[i].set,
 894                                                             set_type, first, n);
 895                 if (!pw->p[i].set)
 896                         goto error;
 897                 pw->p[i].FIELD = FN(EL,insert_dims)(pw->p[i].FIELD,
 898                                                                 type, first, n);
 899                 if (!pw->p[i].FIELD)
 900                         goto error;
 901         }
 902
 903         return pw;
 904 error:
 905         FN(PW,free)(pw);
 906         return NULL;
 907 }
 908 #endif
 909
 910 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
 911         enum isl_dim_type type, unsigned pos, isl_int v)
 912 {
 913         int i;
 914
 915         if (!pw)
 916                 return NULL;
 917
 918         if (type == isl_dim_in)
 919                 type = isl_dim_set;
 920
 921         pw = FN(PW,cow)(pw);
 922         if (!pw)
 923                 return NULL;
 924         for (i = 0; i < pw->n; ++i) {
 925                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
 926                 if (!pw->p[i].set)
 927                         goto error;
 928         }
 929
 930         return pw;
 931 error:
 932         FN(PW,free)(pw);
 933         return NULL;
 934 }
 935
 936 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
 937 {
 938         return pw ? isl_space_dim(pw->dim, type) : 0;
 939 }
 940
 941 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
 942         enum isl_dim_type type, unsigned first, unsigned n)
 943 {
 944         int i;
 945
 946         if (!pw)
 947                 return NULL;
 948         if (n == 0)
 949                 return pw;
 950
 951         if (type == isl_dim_in)
 952                 type = isl_dim_set;
 953
 954         pw = FN(PW,cow)(pw);
 955         if (!pw)
 956                 return NULL;
 957         if (!pw->dim)
 958                 goto error;
 959         for (i = 0; i < pw->n; ++i) {
 960                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
 961                 if (!pw->p[i].set)
 962                         goto error;
 963         }
 964
 965         return pw;
 966 error:
 967         FN(PW,free)(pw);
 968         return NULL;
 969 }
 970
 971 #ifndef NO_OPT
 972 /* Compute the maximal value attained by the piecewise quasipolynomial
 973  * on its domain or zero if the domain is empty.
 974  * In the worst case, the domain is scanned completely,
 975  * so the domain is assumed to be bounded.
 976  */
 977 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
 978 {
 979         int i;
 980         isl_qpolynomial *opt;
 981
 982         if (!pw)
 983                 return NULL;
 984
 985         if (pw->n == 0) {
 986                 isl_space *dim = isl_space_copy(pw->dim);
 987                 FN(PW,free)(pw);
 988                 return isl_qpolynomial_zero_on_domain(dim);
 989         }
 990
 991         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
 992                                         isl_set_copy(pw->p[0].set), max);
 993         for (i = 1; i < pw->n; ++i) {
 994                 isl_qpolynomial *opt_i;
 995                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
 996                                                 isl_set_copy(pw->p[i].set), max);
 997                 if (max)
 998                         opt = isl_qpolynomial_max_cst(opt, opt_i);
 999                 else
1000                         opt = isl_qpolynomial_min_cst(opt, opt_i);
1001         }
1002
1003         FN(PW,free)(pw);
1004         return opt;
1005 }
1006
1007 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
1008 {
1009         return FN(PW,opt)(pw, 1);
1010 }
1011
1012 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
1013 {
1014         return FN(PW,opt)(pw, 0);
1015 }
1016 #endif
1017
1018 __isl_give isl_space *FN(PW,get_space)(__isl_keep PW *pw)
1019 {
1020         return pw ? isl_space_copy(pw->dim) : NULL;
1021 }
1022
1023 __isl_give isl_space *FN(PW,get_domain_space)(__isl_keep PW *pw)
1024 {
1025         return pw ? isl_space_domain(isl_space_copy(pw->dim)) : NULL;
1026 }
1027
1028 #ifndef NO_RESET_DIM
1029 /* Reset the space of "pw".  Since we don't know if the elements
1030  * represent the spaces themselves or their domains, we pass along
1031  * both when we call their reset_space_and_domain.
1032  */
1033 static __isl_give PW *FN(PW,reset_space_and_domain)(__isl_take PW *pw,
1034         __isl_take isl_space *space, __isl_take isl_space *domain)
1035 {
1036         int i;
1037
1038         pw = FN(PW,cow)(pw);
1039         if (!pw || !space || !domain)
1040                 goto error;
1041
1042         for (i = 0; i < pw->n; ++i) {
1043                 pw->p[i].set = isl_set_reset_space(pw->p[i].set,
1044                                                  isl_space_copy(domain));
1045                 if (!pw->p[i].set)
1046                         goto error;
1047                 pw->p[i].FIELD = FN(EL,reset_space_and_domain)(pw->p[i].FIELD,
1048                               isl_space_copy(space), isl_space_copy(domain));
1049                 if (!pw->p[i].FIELD)
1050                         goto error;
1051         }
1052
1053         isl_space_free(domain);
1054
1055         isl_space_free(pw->dim);
1056         pw->dim = space;
1057
1058         return pw;
1059 error:
1060         isl_space_free(domain);
1061         isl_space_free(space);
1062         FN(PW,free)(pw);
1063         return NULL;
1064 }
1065
1066 __isl_give PW *FN(PW,reset_domain_space)(__isl_take PW *pw,
1067         __isl_take isl_space *domain)
1068 {
1069         isl_space *space;
1070
1071         space = isl_space_extend_domain_with_range(isl_space_copy(domain),
1072                                                    FN(PW,get_space)(pw));
1073         return FN(PW,reset_space_and_domain)(pw, space, domain);
1074 }
1075
1076 __isl_give PW *FN(PW,reset_space)(__isl_take PW *pw, __isl_take isl_space *dim)
1077 {
1078         isl_space *domain;
1079
1080         domain = isl_space_domain(isl_space_copy(dim));
1081         return FN(PW,reset_space_and_domain)(pw, dim, domain);
1082 }
1083
1084 __isl_give PW *FN(PW,set_tuple_id)(__isl_keep PW *pw, enum isl_dim_type type,
1085         __isl_take isl_id *id)
1086 {
1087         isl_space *space;
1088
1089         pw = FN(PW,cow)(pw);
1090         if (!pw)
1091                 return isl_id_free(id);
1092
1093         space = FN(PW,get_space)(pw);
1094         space = isl_space_set_tuple_id(space, type, id);
1095
1096         return FN(PW,reset_space)(pw, space);
1097 }
1098 #endif
1099
1100 int FN(PW,has_equal_space)(__isl_keep PW *pw1, __isl_keep PW *pw2)
1101 {
1102         if (!pw1 || !pw2)
1103                 return -1;
1104
1105         return isl_space_is_equal(pw1->dim, pw2->dim);
1106 }
1107
1108 #ifndef NO_MORPH
1109 __isl_give PW *FN(PW,morph_domain)(__isl_take PW *pw,
1110         __isl_take isl_morph *morph)
1111 {
1112         int i;
1113         isl_ctx *ctx;
1114
1115         if (!pw || !morph)
1116                 goto error;
1117
1118         ctx = isl_space_get_ctx(pw->dim);
1119         isl_assert(ctx, isl_space_is_domain(morph->dom->dim, pw->dim),
1120                 goto error);
1121
1122         pw = FN(PW,cow)(pw);
1123         if (!pw)
1124                 goto error;
1125         pw->dim = isl_space_extend_domain_with_range(
1126                         isl_space_copy(morph->ran->dim), pw->dim);
1127         if (!pw->dim)
1128                 goto error;
1129
1130         for (i = 0; i < pw->n; ++i) {
1131                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
1132                 if (!pw->p[i].set)
1133                         goto error;
1134                 pw->p[i].FIELD = FN(EL,morph_domain)(pw->p[i].FIELD,
1135                                                 isl_morph_copy(morph));
1136                 if (!pw->p[i].FIELD)
1137                         goto error;
1138         }
1139
1140         isl_morph_free(morph);
1141
1142         return pw;
1143 error:
1144         FN(PW,free)(pw);
1145         isl_morph_free(morph);
1146         return NULL;
1147 }
1148 #endif
1149
1150 int FN(PW,foreach_piece)(__isl_keep PW *pw,
1151         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
1152         void *user)
1153 {
1154         int i;
1155
1156         if (!pw)
1157                 return -1;
1158
1159         for (i = 0; i < pw->n; ++i)
1160                 if (fn(isl_set_copy(pw->p[i].set),
1161                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
1162                         return -1;
1163
1164         return 0;
1165 }
1166
1167 #ifndef NO_LIFT
1168 static int any_divs(__isl_keep isl_set *set)
1169 {
1170         int i;
1171
1172         if (!set)
1173                 return -1;
1174
1175         for (i = 0; i < set->n; ++i)
1176                 if (set->p[i]->n_div > 0)
1177                         return 1;
1178
1179         return 0;
1180 }
1181
1182 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
1183         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
1184                     void *user), void *user)
1185 {
1186         int i;
1187
1188         if (!set || !el)
1189                 goto error;
1190
1191         for (i = 0; i < set->n; ++i) {
1192                 isl_set *lift;
1193                 EL *copy;
1194
1195                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
1196                 lift = isl_set_lift(lift);
1197
1198                 copy = FN(EL,copy)(el);
1199                 copy = FN(EL,lift)(copy, isl_set_get_space(lift));
1200
1201                 if (fn(lift, copy, user) < 0)
1202                         goto error;
1203         }
1204
1205         isl_set_free(set);
1206         FN(EL,free)(el);
1207
1208         return 0;
1209 error:
1210         isl_set_free(set);
1211         FN(EL,free)(el);
1212         return -1;
1213 }
1214
1215 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
1216         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
1217                     void *user), void *user)
1218 {
1219         int i;
1220
1221         if (!pw)
1222                 return -1;
1223
1224         for (i = 0; i < pw->n; ++i) {
1225                 isl_set *set;
1226                 EL *el;
1227
1228                 set = isl_set_copy(pw->p[i].set);
1229                 el = FN(EL,copy)(pw->p[i].FIELD);
1230                 if (!any_divs(set)) {
1231                         if (fn(set, el, user) < 0)
1232                                 return -1;
1233                         continue;
1234                 }
1235                 if (foreach_lifted_subset(set, el, fn, user) < 0)
1236                         return -1;
1237         }
1238
1239         return 0;
1240 }
1241 #endif
1242
1243 #ifndef NO_MOVE_DIMS
1244 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
1245         enum isl_dim_type dst_type, unsigned dst_pos,
1246         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
1247 {
1248         int i;
1249
1250         pw = FN(PW,cow)(pw);
1251         if (!pw)
1252                 return NULL;
1253
1254         pw->dim = isl_space_move_dims(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
1255         if (!pw->dim)
1256                 goto error;
1257
1258         for (i = 0; i < pw->n; ++i) {
1259                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
1260                                         dst_type, dst_pos, src_type, src_pos, n);
1261                 if (!pw->p[i].FIELD)
1262                         goto error;
1263         }
1264
1265         if (dst_type == isl_dim_in)
1266                 dst_type = isl_dim_set;
1267         if (src_type == isl_dim_in)
1268                 src_type = isl_dim_set;
1269
1270         for (i = 0; i < pw->n; ++i) {
1271                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
1272                                                 dst_type, dst_pos,
1273                                                 src_type, src_pos, n);
1274                 if (!pw->p[i].set)
1275                         goto error;
1276         }
1277
1278         return pw;
1279 error:
1280         FN(PW,free)(pw);
1281         return NULL;
1282 }
1283 #endif
1284
1285 __isl_give PW *FN(PW,mul_isl_int)(__isl_take PW *pw, isl_int v)
1286 {
1287         int i;
1288
1289         if (isl_int_is_one(v))
1290                 return pw;
1291         if (pw && isl_int_is_zero(v)) {
1292                 PW *zero;
1293                 isl_space *dim = FN(PW,get_space)(pw);
1294 #ifdef HAS_TYPE
1295                 zero = FN(PW,ZERO)(dim, pw->type);
1296 #else
1297                 zero = FN(PW,ZERO)(dim);
1298 #endif
1299                 FN(PW,free)(pw);
1300                 return zero;
1301         }
1302         pw = FN(PW,cow)(pw);
1303         if (!pw)
1304                 return NULL;
1305         if (pw->n == 0)
1306                 return pw;
1307
1308 #ifdef HAS_TYPE
1309         if (isl_int_is_neg(v))
1310                 pw->type = isl_fold_type_negate(pw->type);
1311 #endif
1312         for (i = 0; i < pw->n; ++i) {
1313                 pw->p[i].FIELD = FN(EL,scale)(pw->p[i].FIELD, v);
1314                 if (!pw->p[i].FIELD)
1315                         goto error;
1316         }
1317
1318         return pw;
1319 error:
1320         FN(PW,free)(pw);
1321         return NULL;
1322 }
1323
1324 __isl_give PW *FN(PW,scale)(__isl_take PW *pw, isl_int v)
1325 {
1326         return FN(PW,mul_isl_int)(pw, v);
1327 }
1328
1329 static int FN(PW,qsort_set_cmp)(const void *p1, const void *p2)
1330 {
1331         const isl_set *set1 = *(const isl_set **)p1;
1332         const isl_set *set2 = *(const isl_set **)p2;
1333
1334         return isl_set_plain_cmp(set1, set2);
1335 }
1336
1337 /* We normalize in place, but if anything goes wrong we need
1338  * to return NULL, so we need to make sure we don't change the
1339  * meaning of any possible other copies of map.
1340  */
1341 __isl_give PW *FN(PW,normalize)(__isl_take PW *pw)
1342 {
1343         int i, j;
1344         isl_set *set;
1345
1346         if (!pw)
1347                 return NULL;
1348         for (i = 0; i < pw->n; ++i) {
1349                 set = isl_set_normalize(isl_set_copy(pw->p[i].set));
1350                 if (!set)
1351                         return FN(PW,free)(pw);
1352                 isl_set_free(pw->p[i].set);
1353                 pw->p[i].set = set;
1354         }
1355         qsort(pw->p, pw->n, sizeof(pw->p[0]), &FN(PW,qsort_set_cmp));
1356         for (i = pw->n - 1; i >= 1; --i) {
1357                 if (!isl_set_plain_is_equal(pw->p[i - 1].set, pw->p[i].set))
1358                         continue;
1359                 if (!FN(EL,plain_is_equal)(pw->p[i - 1].FIELD, pw->p[i].FIELD))
1360                         continue;
1361                 set = isl_set_union(isl_set_copy(pw->p[i - 1].set),
1362                                     isl_set_copy(pw->p[i].set));
1363                 if (!set)
1364                         return FN(PW,free)(pw);
1365                 isl_set_free(pw->p[i].set);
1366                 FN(EL,free)(pw->p[i].FIELD);
1367                 isl_set_free(pw->p[i - 1].set);
1368                 pw->p[i - 1].set = set;
1369                 for (j = i + 1; j < pw->n; ++j)
1370                         pw->p[j - 1] = pw->p[j];
1371                 pw->n--;
1372         }
1373
1374         return pw;
1375 }
1376
1377 /* Is pw1 obviously equal to pw2?
1378  * That is, do they have obviously identical cells and obviously identical
1379  * elements on each cell?
1380  */
1381 int FN(PW,plain_is_equal)(__isl_keep PW *pw1, __isl_keep PW *pw2)
1382 {
1383         int i;
1384         int equal;
1385
1386         if (!pw1 || !pw2)
1387                 return -1;
1388
1389         if (pw1 == pw2)
1390                 return 1;
1391         if (!isl_space_is_equal(pw1->dim, pw2->dim))
1392                 return 0;
1393
1394         pw1 = FN(PW,copy)(pw1);
1395         pw2 = FN(PW,copy)(pw2);
1396         pw1 = FN(PW,normalize)(pw1);
1397         pw2 = FN(PW,normalize)(pw2);
1398         if (!pw1 || !pw2)
1399                 goto error;
1400
1401         equal = pw1->n == pw2->n;
1402         for (i = 0; equal && i < pw1->n; ++i) {
1403                 equal = isl_set_plain_is_equal(pw1->p[i].set, pw2->p[i].set);
1404                 if (equal < 0)
1405                         goto error;
1406                 if (!equal)
1407                         break;
1408                 equal = FN(EL,plain_is_equal)(pw1->p[i].FIELD, pw2->p[i].FIELD);
1409                 if (equal < 0)
1410                         goto error;
1411         }
1412
1413         FN(PW,free)(pw1);
1414         FN(PW,free)(pw2);
1415         return equal;
1416 error:
1417         FN(PW,free)(pw1);
1418         FN(PW,free)(pw2);
1419         return -1;
1420 }