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 static __isl_give PW *FN(PW,alloc_)(__isl_take isl_dim *dim, int n)
   7 {
   8         struct PW *pw;
   9
  10         if (!dim)
  11                 return NULL;
  12         isl_assert(dim->ctx, n >= 0, goto error);
  13         pw = isl_alloc(dim->ctx, struct PW,
  14                         sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
  15         if (!pw)
  16                 goto error;
  17
  18         pw->ref = 1;
  19         pw->size = n;
  20         pw->n = 0;
  21         pw->dim = dim;
  22         return pw;
  23 error:
  24         isl_dim_free(dim);
  25         return NULL;
  26 }
  27
  28 __isl_give PW *FN(PW,zero)(__isl_take isl_dim *dim)
  29 {
  30         return FN(PW,alloc_)(dim, 0);
  31 }
  32
  33 __isl_give PW *FN(PW,add_piece)(__isl_take PW *pw,
  34         __isl_take isl_set *set, __isl_take EL *el)
  35 {
  36         if (!pw || !set || !el)
  37                 goto error;
  38
  39         if (isl_set_fast_is_empty(set) || FN(EL,IS_ZERO)(el)) {
  40                 isl_set_free(set);
  41                 FN(EL,free)(el);
  42                 return pw;
  43         }
  44
  45         isl_assert(set->ctx, isl_dim_equal(pw->dim, el->dim), goto error);
  46         isl_assert(set->ctx, pw->n < pw->size, goto error);
  47
  48         pw->p[pw->n].set = set;
  49         pw->p[pw->n].FIELD = el;
  50         pw->n++;
  51
  52         return pw;
  53 error:
  54         FN(PW,free)(pw);
  55         isl_set_free(set);
  56         FN(EL,free)(el);
  57         return NULL;
  58 }
  59
  60 __isl_give PW *FN(PW,alloc)(__isl_take isl_set *set, __isl_take EL *el)
  61 {
  62         PW *pw;
  63
  64         if (!set || !el)
  65                 goto error;
  66
  67         pw = FN(PW,alloc_)(isl_set_get_dim(set), 1);
  68
  69         return FN(PW,add_piece)(pw, set, el);
  70 error:
  71         isl_set_free(set);
  72         FN(EL,free)(el);
  73         return NULL;
  74 }
  75
  76 __isl_give PW *FN(PW,dup)(__isl_keep PW *pw)
  77 {
  78         int i;
  79         PW *dup;
  80
  81         if (!pw)
  82                 return NULL;
  83
  84         dup = FN(PW,alloc_)(isl_dim_copy(pw->dim), pw->n);
  85         if (!dup)
  86                 return NULL;
  87
  88         for (i = 0; i < pw->n; ++i)
  89                 dup = FN(PW,add_piece)(dup, isl_set_copy(pw->p[i].set),
  90                                             FN(EL,copy)(pw->p[i].FIELD));
  91
  92         return dup;
  93 error:
  94         FN(PW,free)(dup);
  95         return NULL;
  96 }
  97
  98 __isl_give PW *FN(PW,cow)(__isl_take PW *pw)
  99 {
 100         if (!pw)
 101                 return NULL;
 102
 103         if (pw->ref == 1)
 104                 return pw;
 105         pw->ref--;
 106         return FN(PW,dup)(pw);
 107 }
 108
 109 __isl_give PW *FN(PW,copy)(__isl_keep PW *pw)
 110 {
 111         if (!pw)
 112                 return NULL;
 113
 114         pw->ref++;
 115         return pw;
 116 }
 117
 118 void FN(PW,free)(__isl_take PW *pw)
 119 {
 120         int i;
 121
 122         if (!pw)
 123                 return;
 124         if (--pw->ref > 0)
 125                 return;
 126
 127         for (i = 0; i < pw->n; ++i) {
 128                 isl_set_free(pw->p[i].set);
 129                 FN(EL,free)(pw->p[i].FIELD);
 130         }
 131         isl_dim_free(pw->dim);
 132         free(pw);
 133 }
 134
 135 int FN(PW,is_zero)(__isl_keep PW *pw)
 136 {
 137         if (!pw)
 138                 return -1;
 139
 140         return pw->n == 0;
 141 }
 142
 143 __isl_give PW *FN(PW,add)(__isl_take PW *pw1, __isl_take PW *pw2)
 144 {
 145         int i, j, n;
 146         struct PW *res;
 147         isl_set *set;
 148
 149         if (!pw1 || !pw2)
 150                 goto error;
 151
 152         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
 153
 154         if (FN(PW,is_zero)(pw1)) {
 155                 FN(PW,free)(pw1);
 156                 return pw2;
 157         }
 158
 159         if (FN(PW,is_zero)(pw2)) {
 160                 FN(PW,free)(pw2);
 161                 return pw1;
 162         }
 163
 164         n = (pw1->n + 1) * (pw2->n + 1);
 165         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), n);
 166
 167         for (i = 0; i < pw1->n; ++i) {
 168                 set = isl_set_copy(pw1->p[i].set);
 169                 for (j = 0; j < pw2->n; ++j) {
 170                         struct isl_set *common;
 171                         EL *sum;
 172                         set = isl_set_subtract(set,
 173                                         isl_set_copy(pw2->p[j].set));
 174                         common = isl_set_intersect(isl_set_copy(pw1->p[i].set),
 175                                                 isl_set_copy(pw2->p[j].set));
 176                         if (isl_set_fast_is_empty(common)) {
 177                                 isl_set_free(common);
 178                                 continue;
 179                         }
 180
 181                         sum = ADD(common, FN(EL,copy)(pw1->p[i].FIELD),
 182                                           FN(EL,copy)(pw2->p[j].FIELD));
 183
 184                         res = FN(PW,add_piece)(res, common, sum);
 185                 }
 186                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw1->p[i].FIELD));
 187         }
 188
 189         for (j = 0; j < pw2->n; ++j) {
 190                 set = isl_set_copy(pw2->p[j].set);
 191                 for (i = 0; i < pw1->n; ++i)
 192                         set = isl_set_subtract(set,
 193                                         isl_set_copy(pw1->p[i].set));
 194                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw2->p[j].FIELD));
 195         }
 196
 197         FN(PW,free)(pw1);
 198         FN(PW,free)(pw2);
 199
 200         return res;
 201 error:
 202         FN(PW,free)(pw1);
 203         FN(PW,free)(pw2);
 204         return NULL;
 205 }
 206
 207 __isl_give PW *FN(PW,add_disjoint)(__isl_take PW *pw1, __isl_take PW *pw2)
 208 {
 209         int i;
 210         PW *res;
 211
 212         if (!pw1 || !pw2)
 213                 goto error;
 214
 215         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
 216
 217         if (FN(PW,is_zero)(pw1)) {
 218                 FN(PW,free)(pw1);
 219                 return pw2;
 220         }
 221
 222         if (FN(PW,is_zero)(pw2)) {
 223                 FN(PW,free)(pw2);
 224                 return pw1;
 225         }
 226
 227         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->n + pw2->n);
 228
 229         for (i = 0; i < pw1->n; ++i)
 230                 res = FN(PW,add_piece)(res,
 231                                 isl_set_copy(pw1->p[i].set),
 232                                 FN(EL,copy)(pw1->p[i].FIELD));
 233
 234         for (i = 0; i < pw2->n; ++i)
 235                 res = FN(PW,add_piece)(res,
 236                                 isl_set_copy(pw2->p[i].set),
 237                                 FN(EL,copy)(pw2->p[i].FIELD));
 238
 239         FN(PW,free)(pw1);
 240         FN(PW,free)(pw2);
 241
 242         return res;
 243 error:
 244         FN(PW,free)(pw1);
 245         FN(PW,free)(pw2);
 246         return NULL;
 247 }
 248
 249 __isl_give isl_qpolynomial *FN(PW,eval)(__isl_take PW *pw,
 250         __isl_take isl_point *pnt)
 251 {
 252         int i;
 253         int found = 0;
 254         isl_qpolynomial *qp;
 255
 256         if (!pw || !pnt)
 257                 goto error;
 258         isl_assert(pnt->dim->ctx, isl_dim_equal(pnt->dim, pw->dim), goto error);
 259
 260         for (i = 0; i < pw->n; ++i) {
 261                 found = isl_set_contains_point(pw->p[i].set, pnt);
 262                 if (found < 0)
 263                         goto error;
 264                 if (found)
 265                         break;
 266         }
 267         if (found)
 268                 qp = FN(EL,eval)(FN(EL,copy)(pw->p[i].FIELD),
 269                                             isl_point_copy(pnt));
 270         else
 271                 qp = isl_qpolynomial_zero(isl_dim_copy(pw->dim));
 272         FN(PW,free)(pw);
 273         isl_point_free(pnt);
 274         return qp;
 275 error:
 276         FN(PW,free)(pw);
 277         isl_point_free(pnt);
 278         return NULL;
 279 }
 280
 281 __isl_give isl_set *FN(PW,domain)(__isl_take PW *pw)
 282 {
 283         int i;
 284         isl_set *dom;
 285
 286         if (!pw)
 287                 return NULL;
 288
 289         dom = isl_set_empty(isl_dim_copy(pw->dim));
 290         for (i = 0; i < pw->n; ++i)
 291                 dom = isl_set_union_disjoint(dom, isl_set_copy(pw->p[i].set));
 292
 293         FN(PW,free)(pw);
 294
 295         return dom;
 296 }
 297
 298 __isl_give PW *FN(PW,intersect_domain)(__isl_take PW *pw, __isl_take isl_set *set)
 299 {
 300         int i;
 301
 302         if (!pw || !set)
 303                 goto error;
 304
 305         if (pw->n == 0) {
 306                 isl_set_free(set);
 307                 return pw;
 308         }
 309
 310         pw = FN(PW,cow)(pw);
 311         if (!pw)
 312                 goto error;
 313
 314         for (i = pw->n - 1; i >= 0; --i) {
 315                 pw->p[i].set = isl_set_intersect(pw->p[i].set, isl_set_copy(set));
 316                 if (!pw->p[i].set)
 317                         goto error;
 318                 if (isl_set_fast_is_empty(pw->p[i].set)) {
 319                         isl_set_free(pw->p[i].set);
 320                         FN(EL,free)(pw->p[i].FIELD);
 321                         if (i != pw->n - 1)
 322                                 pw->p[i] = pw->p[pw->n - 1];
 323                         pw->n--;
 324                 }
 325         }
 326
 327         isl_set_free(set);
 328         return pw;
 329 error:
 330         isl_set_free(set);
 331         FN(PW,free)(pw);
 332         return NULL;
 333 }
 334
 335 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
 336 {
 337         int i;
 338         isl_basic_set *hull = NULL;
 339
 340         if (!pw || !context)
 341                 goto error;
 342
 343         if (pw->n == 0) {
 344                 isl_set_free(context);
 345                 return pw;
 346         }
 347
 348         hull = isl_set_simple_hull(isl_set_copy(context));
 349
 350         pw = FN(PW,cow)(pw);
 351         if (!pw)
 352                 goto error;
 353
 354         for (i = 0; i < pw->n; ++i) {
 355                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 356                                                 isl_basic_set_copy(hull));
 357                 if (!pw->p[i].set)
 358                         goto error;
 359         }
 360
 361         isl_basic_set_free(hull);
 362         isl_set_free(context);
 363
 364         return pw;
 365 error:
 366         FN(PW,free)(pw);
 367         isl_basic_set_free(hull);
 368         isl_set_free(context);
 369         return NULL;
 370 }
 371
 372 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 373 {
 374         int i, j;
 375
 376         if (!pw)
 377                 return NULL;
 378         if (pw->n == 0)
 379                 return pw;
 380
 381         for (i = pw->n - 1; i >= 0; --i) {
 382                 for (j = i - 1; j >= 0; --j) {
 383                         if (!FN(EL,is_equal)(pw->p[i].FIELD, pw->p[j].FIELD))
 384                                 continue;
 385                         pw->p[j].set = isl_set_union(pw->p[j].set,
 386                                                         pw->p[i].set);
 387                         FN(EL,free)(pw->p[i].FIELD);
 388                         if (i != pw->n - 1)
 389                                 pw->p[i] = pw->p[pw->n - 1];
 390                         pw->n--;
 391                         break;
 392                 }
 393                 if (j >= 0)
 394                         continue;
 395                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 396                 if (!pw->p[i].set)
 397                         goto error;
 398         }
 399
 400         return pw;
 401 error:
 402         FN(PW,free)(pw);
 403         return NULL;
 404 }
 405
 406 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 407 {
 408         return pw ? pw->dim->ctx : NULL;
 409 }
 410
 411 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 412         unsigned first, unsigned n)
 413 {
 414         int i;
 415
 416         if (!pw)
 417                 return -1;
 418         if (pw->n == 0 || n == 0)
 419                 return 0;
 420         for (i = 0; i < pw->n; ++i) {
 421                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 422                                                         type, first, n);
 423                 if (involves < 0 || involves)
 424                         return involves;
 425         }
 426         return 0;
 427 }
 428
 429 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 430         enum isl_dim_type type, unsigned first, unsigned n)
 431 {
 432         int i;
 433
 434         if (!pw)
 435                 return NULL;
 436         if (n == 0 && !isl_dim_get_tuple_name(pw->dim, type))
 437                 return pw;
 438
 439         pw = FN(PW,cow)(pw);
 440         if (!pw)
 441                 return NULL;
 442         pw->dim = isl_dim_drop(pw->dim, type, first, n);
 443         if (!pw->dim)
 444                 goto error;
 445         for (i = 0; i < pw->n; ++i) {
 446                 pw->p[i].set = isl_set_drop(pw->p[i].set, type, first, n);
 447                 if (!pw->p[i].set)
 448                         goto error;
 449                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 450                 if (!pw->p[i].FIELD)
 451                         goto error;
 452         }
 453
 454         return pw;
 455 error:
 456         FN(PW,free)(pw);
 457         return NULL;
 458 }
 459
 460 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
 461         enum isl_dim_type type, unsigned pos, isl_int v)
 462 {
 463         int i;
 464
 465         if (!pw)
 466                 return NULL;
 467
 468         pw = FN(PW,cow)(pw);
 469         if (!pw)
 470                 return NULL;
 471         for (i = 0; i < pw->n; ++i) {
 472                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
 473                 if (!pw->p[i].set)
 474                         goto error;
 475         }
 476
 477         return pw;
 478 error:
 479         FN(PW,free)(pw);
 480         return NULL;
 481 }
 482
 483 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
 484 {
 485         return pw ? isl_dim_size(pw->dim, type) : 0;
 486 }
 487
 488 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
 489         enum isl_dim_type type, unsigned first, unsigned n)
 490 {
 491         int i;
 492
 493         if (!pw)
 494                 return NULL;
 495         if (n == 0)
 496                 return pw;
 497
 498         pw = FN(PW,cow)(pw);
 499         if (!pw)
 500                 return NULL;
 501         if (!pw->dim)
 502                 goto error;
 503         for (i = 0; i < pw->n; ++i) {
 504                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
 505                 if (!pw->p[i].set)
 506                         goto error;
 507         }
 508
 509         return pw;
 510 error:
 511         FN(PW,free)(pw);
 512         return NULL;
 513 }
 514
 515 /* Compute the maximal value attained by the piecewise quasipolynomial
 516  * on its domain or zero if the domain is empty.
 517  * In the worst case, the domain is scanned completely,
 518  * so the domain is assumed to be bounded.
 519  */
 520 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
 521 {
 522         int i;
 523         isl_qpolynomial *opt;
 524
 525         if (!pw)
 526                 return NULL;
 527
 528         if (pw->n == 0) {
 529                 isl_dim *dim = isl_dim_copy(pw->dim);
 530                 FN(PW,free)(pw);
 531                 return isl_qpolynomial_zero(dim);
 532         }
 533
 534         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
 535                                         isl_set_copy(pw->p[0].set), max);
 536         for (i = 1; i < pw->n; ++i) {
 537                 isl_qpolynomial *opt_i;
 538                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
 539                                                 isl_set_copy(pw->p[i].set), max);
 540                 if (max)
 541                         opt = isl_qpolynomial_max_cst(opt, opt_i);
 542                 else
 543                         opt = isl_qpolynomial_min_cst(opt, opt_i);
 544         }
 545
 546         FN(PW,free)(pw);
 547         return opt;
 548 }
 549
 550 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
 551 {
 552         return FN(PW,opt)(pw, 1);
 553 }
 554
 555 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
 556 {
 557         return FN(PW,opt)(pw, 0);
 558 }
 559
 560 __isl_give isl_dim *FN(PW,get_dim)(__isl_keep PW *pw)
 561 {
 562         return pw ? isl_dim_copy(pw->dim) : NULL;
 563 }
 564
 565 __isl_give PW *FN(PW,reset_dim)(__isl_take PW *pw, __isl_take isl_dim *dim)
 566 {
 567         int i;
 568
 569         pw = FN(PW,cow)(pw);
 570         if (!pw || !dim)
 571                 goto error;
 572
 573         for (i = 0; i < pw->n; ++i) {
 574                 pw->p[i].set = isl_set_reset_dim(pw->p[i].set,
 575                                                  isl_dim_copy(dim));
 576                 if (!pw->p[i].set)
 577                         goto error;
 578                 pw->p[i].FIELD = FN(EL,reset_dim)(pw->p[i].FIELD,
 579                                                   isl_dim_copy(dim));
 580                 if (!pw->p[i].FIELD)
 581                         goto error;
 582         }
 583         isl_dim_free(pw->dim);
 584         pw->dim = dim;
 585
 586         return pw;
 587 error:
 588         isl_dim_free(dim);
 589         FN(PW,free)(pw);
 590         return NULL;
 591 }
 592
 593 int FN(PW,has_equal_dim)(__isl_keep PW *pw1, __isl_keep PW *pw2)
 594 {
 595         if (!pw1 || !pw2)
 596                 return -1;
 597
 598         return isl_dim_equal(pw1->dim, pw2->dim);
 599 }
 600
 601 __isl_give PW *FN(PW,morph)(__isl_take PW *pw, __isl_take isl_morph *morph)
 602 {
 603         int i;
 604
 605         if (!pw || !morph)
 606                 goto error;
 607
 608         isl_assert(pw->dim->ctx, isl_dim_equal(pw->dim, morph->dom->dim),
 609                 goto error);
 610
 611         pw = FN(PW,cow)(pw);
 612         if (!pw)
 613                 goto error;
 614         isl_dim_free(pw->dim);
 615         pw->dim = isl_dim_copy(morph->ran->dim);
 616         if (!pw->dim)
 617                 goto error;
 618
 619         for (i = 0; i < pw->n; ++i) {
 620                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
 621                 if (!pw->p[i].set)
 622                         goto error;
 623                 pw->p[i].FIELD = FN(EL,morph)(pw->p[i].FIELD,
 624                                                 isl_morph_copy(morph));
 625                 if (!pw->p[i].FIELD)
 626                         goto error;
 627         }
 628
 629         isl_morph_free(morph);
 630
 631         return pw;
 632 error:
 633         FN(PW,free)(pw);
 634         isl_morph_free(morph);
 635         return NULL;
 636 }
 637
 638 int FN(PW,foreach_piece)(__isl_keep PW *pw,
 639         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
 640         void *user)
 641 {
 642         int i;
 643
 644         if (!pw)
 645                 return -1;
 646
 647         for (i = 0; i < pw->n; ++i)
 648                 if (fn(isl_set_copy(pw->p[i].set),
 649                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
 650                         return -1;
 651
 652         return 0;
 653 }
 654
 655 static int any_divs(__isl_keep isl_set *set)
 656 {
 657         int i;
 658
 659         if (!set)
 660                 return -1;
 661
 662         for (i = 0; i < set->n; ++i)
 663                 if (set->p[i]->n_div > 0)
 664                         return 1;
 665
 666         return 0;
 667 }
 668
 669 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
 670         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 671                     void *user), void *user)
 672 {
 673         int i;
 674
 675         if (!set || !el)
 676                 goto error;
 677
 678         for (i = 0; i < set->n; ++i) {
 679                 isl_set *lift;
 680                 EL *copy;
 681
 682                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
 683                 lift = isl_set_lift(lift);
 684
 685                 copy = FN(EL,copy)(el);
 686                 copy = FN(EL,lift)(copy, isl_set_get_dim(lift));
 687
 688                 if (fn(lift, copy, user) < 0)
 689                         goto error;
 690         }
 691
 692         isl_set_free(set);
 693         FN(EL,free)(el);
 694
 695         return 0;
 696 error:
 697         isl_set_free(set);
 698         FN(EL,free)(el);
 699         return -1;
 700 }
 701
 702 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
 703         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 704                     void *user), void *user)
 705 {
 706         int i;
 707
 708         if (!pw)
 709                 return -1;
 710
 711         for (i = 0; i < pw->n; ++i) {
 712                 isl_set *set;
 713                 EL *el;
 714
 715                 set = isl_set_copy(pw->p[i].set);
 716                 el = FN(EL,copy)(pw->p[i].FIELD);
 717                 if (!any_divs(set)) {
 718                         if (fn(set, el, user) < 0)
 719                                 return -1;
 720                         continue;
 721                 }
 722                 if (foreach_lifted_subset(set, el, fn, user) < 0)
 723                         return -1;
 724         }
 725
 726         return 0;
 727 }
 728
 729 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
 730         enum isl_dim_type dst_type, unsigned dst_pos,
 731         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 732 {
 733         int i;
 734
 735         pw = FN(PW,cow)(pw);
 736         if (!pw)
 737                 return NULL;
 738
 739         pw->dim = isl_dim_move(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
 740         if (!pw->dim)
 741                 goto error;
 742
 743         for (i = 0; i < pw->n; ++i) {
 744                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
 745                                                 dst_type, dst_pos,
 746                                                 src_type, src_pos, n);
 747                 if (!pw->p[i].set)
 748                         goto error;
 749                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
 750                                         dst_type, dst_pos, src_type, src_pos, n);
 751                 if (!pw->p[i].FIELD)
 752                         goto error;
 753         }
 754
 755         return pw;
 756 error:
 757         FN(PW,free)(pw);
 758         return NULL;
 759 }