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                 isl_basic_set *aff;
 316                 pw->p[i].set = isl_set_intersect(pw->p[i].set, isl_set_copy(set));
 317                 if (!pw->p[i].set)
 318                         goto error;
 319                 aff = isl_set_affine_hull(isl_set_copy(pw->p[i].set));
 320                 pw->p[i].FIELD = FN(EL,substitute_equalities)(pw->p[i].FIELD,
 321                                                                 aff);
 322                 if (isl_set_fast_is_empty(pw->p[i].set)) {
 323                         isl_set_free(pw->p[i].set);
 324                         FN(EL,free)(pw->p[i].FIELD);
 325                         if (i != pw->n - 1)
 326                                 pw->p[i] = pw->p[pw->n - 1];
 327                         pw->n--;
 328                 }
 329         }
 330
 331         isl_set_free(set);
 332         return pw;
 333 error:
 334         isl_set_free(set);
 335         FN(PW,free)(pw);
 336         return NULL;
 337 }
 338
 339 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
 340 {
 341         int i;
 342         isl_basic_set *hull = NULL;
 343
 344         if (!pw || !context)
 345                 goto error;
 346
 347         if (pw->n == 0) {
 348                 isl_set_free(context);
 349                 return pw;
 350         }
 351
 352         hull = isl_set_simple_hull(isl_set_copy(context));
 353
 354         pw = FN(PW,cow)(pw);
 355         if (!pw)
 356                 goto error;
 357
 358         for (i = 0; i < pw->n; ++i) {
 359                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 360                                                 isl_basic_set_copy(hull));
 361                 if (!pw->p[i].set)
 362                         goto error;
 363         }
 364
 365         isl_basic_set_free(hull);
 366         isl_set_free(context);
 367
 368         return pw;
 369 error:
 370         FN(PW,free)(pw);
 371         isl_basic_set_free(hull);
 372         isl_set_free(context);
 373         return NULL;
 374 }
 375
 376 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 377 {
 378         int i, j;
 379
 380         if (!pw)
 381                 return NULL;
 382         if (pw->n == 0)
 383                 return pw;
 384
 385         for (i = pw->n - 1; i >= 0; --i) {
 386                 for (j = i - 1; j >= 0; --j) {
 387                         if (!FN(EL,is_equal)(pw->p[i].FIELD, pw->p[j].FIELD))
 388                                 continue;
 389                         pw->p[j].set = isl_set_union(pw->p[j].set,
 390                                                         pw->p[i].set);
 391                         FN(EL,free)(pw->p[i].FIELD);
 392                         if (i != pw->n - 1)
 393                                 pw->p[i] = pw->p[pw->n - 1];
 394                         pw->n--;
 395                         break;
 396                 }
 397                 if (j >= 0)
 398                         continue;
 399                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 400                 if (!pw->p[i].set)
 401                         goto error;
 402         }
 403
 404         return pw;
 405 error:
 406         FN(PW,free)(pw);
 407         return NULL;
 408 }
 409
 410 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 411 {
 412         return pw ? pw->dim->ctx : NULL;
 413 }
 414
 415 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 416         unsigned first, unsigned n)
 417 {
 418         int i;
 419
 420         if (!pw)
 421                 return -1;
 422         if (pw->n == 0 || n == 0)
 423                 return 0;
 424         for (i = 0; i < pw->n; ++i) {
 425                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 426                                                         type, first, n);
 427                 if (involves < 0 || involves)
 428                         return involves;
 429         }
 430         return 0;
 431 }
 432
 433 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 434         enum isl_dim_type type, unsigned first, unsigned n)
 435 {
 436         int i;
 437
 438         if (!pw)
 439                 return NULL;
 440         if (n == 0 && !isl_dim_get_tuple_name(pw->dim, type))
 441                 return pw;
 442
 443         pw = FN(PW,cow)(pw);
 444         if (!pw)
 445                 return NULL;
 446         pw->dim = isl_dim_drop(pw->dim, type, first, n);
 447         if (!pw->dim)
 448                 goto error;
 449         for (i = 0; i < pw->n; ++i) {
 450                 pw->p[i].set = isl_set_drop(pw->p[i].set, type, first, n);
 451                 if (!pw->p[i].set)
 452                         goto error;
 453                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 454                 if (!pw->p[i].FIELD)
 455                         goto error;
 456         }
 457
 458         return pw;
 459 error:
 460         FN(PW,free)(pw);
 461         return NULL;
 462 }
 463
 464 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
 465         enum isl_dim_type type, unsigned pos, isl_int v)
 466 {
 467         int i;
 468
 469         if (!pw)
 470                 return NULL;
 471
 472         pw = FN(PW,cow)(pw);
 473         if (!pw)
 474                 return NULL;
 475         for (i = 0; i < pw->n; ++i) {
 476                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
 477                 if (!pw->p[i].set)
 478                         goto error;
 479         }
 480
 481         return pw;
 482 error:
 483         FN(PW,free)(pw);
 484         return NULL;
 485 }
 486
 487 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
 488 {
 489         return pw ? isl_dim_size(pw->dim, type) : 0;
 490 }
 491
 492 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
 493         enum isl_dim_type type, unsigned first, unsigned n)
 494 {
 495         int i;
 496
 497         if (!pw)
 498                 return NULL;
 499         if (n == 0)
 500                 return pw;
 501
 502         pw = FN(PW,cow)(pw);
 503         if (!pw)
 504                 return NULL;
 505         if (!pw->dim)
 506                 goto error;
 507         for (i = 0; i < pw->n; ++i) {
 508                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
 509                 if (!pw->p[i].set)
 510                         goto error;
 511         }
 512
 513         return pw;
 514 error:
 515         FN(PW,free)(pw);
 516         return NULL;
 517 }
 518
 519 /* Compute the maximal value attained by the piecewise quasipolynomial
 520  * on its domain or zero if the domain is empty.
 521  * In the worst case, the domain is scanned completely,
 522  * so the domain is assumed to be bounded.
 523  */
 524 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
 525 {
 526         int i;
 527         isl_qpolynomial *opt;
 528
 529         if (!pw)
 530                 return NULL;
 531
 532         if (pw->n == 0) {
 533                 isl_dim *dim = isl_dim_copy(pw->dim);
 534                 FN(PW,free)(pw);
 535                 return isl_qpolynomial_zero(dim);
 536         }
 537
 538         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
 539                                         isl_set_copy(pw->p[0].set), max);
 540         for (i = 1; i < pw->n; ++i) {
 541                 isl_qpolynomial *opt_i;
 542                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
 543                                                 isl_set_copy(pw->p[i].set), max);
 544                 if (max)
 545                         opt = isl_qpolynomial_max_cst(opt, opt_i);
 546                 else
 547                         opt = isl_qpolynomial_min_cst(opt, opt_i);
 548         }
 549
 550         FN(PW,free)(pw);
 551         return opt;
 552 }
 553
 554 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
 555 {
 556         return FN(PW,opt)(pw, 1);
 557 }
 558
 559 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
 560 {
 561         return FN(PW,opt)(pw, 0);
 562 }
 563
 564 __isl_give isl_dim *FN(PW,get_dim)(__isl_keep PW *pw)
 565 {
 566         return pw ? isl_dim_copy(pw->dim) : NULL;
 567 }
 568
 569 __isl_give PW *FN(PW,reset_dim)(__isl_take PW *pw, __isl_take isl_dim *dim)
 570 {
 571         int i;
 572
 573         pw = FN(PW,cow)(pw);
 574         if (!pw || !dim)
 575                 goto error;
 576
 577         for (i = 0; i < pw->n; ++i) {
 578                 pw->p[i].set = isl_set_reset_dim(pw->p[i].set,
 579                                                  isl_dim_copy(dim));
 580                 if (!pw->p[i].set)
 581                         goto error;
 582                 pw->p[i].FIELD = FN(EL,reset_dim)(pw->p[i].FIELD,
 583                                                   isl_dim_copy(dim));
 584                 if (!pw->p[i].FIELD)
 585                         goto error;
 586         }
 587         isl_dim_free(pw->dim);
 588         pw->dim = dim;
 589
 590         return pw;
 591 error:
 592         isl_dim_free(dim);
 593         FN(PW,free)(pw);
 594         return NULL;
 595 }
 596
 597 int FN(PW,has_equal_dim)(__isl_keep PW *pw1, __isl_keep PW *pw2)
 598 {
 599         if (!pw1 || !pw2)
 600                 return -1;
 601
 602         return isl_dim_equal(pw1->dim, pw2->dim);
 603 }
 604
 605 __isl_give PW *FN(PW,morph)(__isl_take PW *pw, __isl_take isl_morph *morph)
 606 {
 607         int i;
 608
 609         if (!pw || !morph)
 610                 goto error;
 611
 612         isl_assert(pw->dim->ctx, isl_dim_equal(pw->dim, morph->dom->dim),
 613                 goto error);
 614
 615         pw = FN(PW,cow)(pw);
 616         if (!pw)
 617                 goto error;
 618         isl_dim_free(pw->dim);
 619         pw->dim = isl_dim_copy(morph->ran->dim);
 620         if (!pw->dim)
 621                 goto error;
 622
 623         for (i = 0; i < pw->n; ++i) {
 624                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
 625                 if (!pw->p[i].set)
 626                         goto error;
 627                 pw->p[i].FIELD = FN(EL,morph)(pw->p[i].FIELD,
 628                                                 isl_morph_copy(morph));
 629                 if (!pw->p[i].FIELD)
 630                         goto error;
 631         }
 632
 633         isl_morph_free(morph);
 634
 635         return pw;
 636 error:
 637         FN(PW,free)(pw);
 638         isl_morph_free(morph);
 639         return NULL;
 640 }
 641
 642 int FN(PW,foreach_piece)(__isl_keep PW *pw,
 643         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
 644         void *user)
 645 {
 646         int i;
 647
 648         if (!pw)
 649                 return -1;
 650
 651         for (i = 0; i < pw->n; ++i)
 652                 if (fn(isl_set_copy(pw->p[i].set),
 653                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
 654                         return -1;
 655
 656         return 0;
 657 }
 658
 659 static int any_divs(__isl_keep isl_set *set)
 660 {
 661         int i;
 662
 663         if (!set)
 664                 return -1;
 665
 666         for (i = 0; i < set->n; ++i)
 667                 if (set->p[i]->n_div > 0)
 668                         return 1;
 669
 670         return 0;
 671 }
 672
 673 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
 674         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 675                     void *user), void *user)
 676 {
 677         int i;
 678
 679         if (!set || !el)
 680                 goto error;
 681
 682         for (i = 0; i < set->n; ++i) {
 683                 isl_set *lift;
 684                 EL *copy;
 685
 686                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
 687                 lift = isl_set_lift(lift);
 688
 689                 copy = FN(EL,copy)(el);
 690                 copy = FN(EL,lift)(copy, isl_set_get_dim(lift));
 691
 692                 if (fn(lift, copy, user) < 0)
 693                         goto error;
 694         }
 695
 696         isl_set_free(set);
 697         FN(EL,free)(el);
 698
 699         return 0;
 700 error:
 701         isl_set_free(set);
 702         FN(EL,free)(el);
 703         return -1;
 704 }
 705
 706 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
 707         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 708                     void *user), void *user)
 709 {
 710         int i;
 711
 712         if (!pw)
 713                 return -1;
 714
 715         for (i = 0; i < pw->n; ++i) {
 716                 isl_set *set;
 717                 EL *el;
 718
 719                 set = isl_set_copy(pw->p[i].set);
 720                 el = FN(EL,copy)(pw->p[i].FIELD);
 721                 if (!any_divs(set)) {
 722                         if (fn(set, el, user) < 0)
 723                                 return -1;
 724                         continue;
 725                 }
 726                 if (foreach_lifted_subset(set, el, fn, user) < 0)
 727                         return -1;
 728         }
 729
 730         return 0;
 731 }
 732
 733 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
 734         enum isl_dim_type dst_type, unsigned dst_pos,
 735         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 736 {
 737         int i;
 738
 739         pw = FN(PW,cow)(pw);
 740         if (!pw)
 741                 return NULL;
 742
 743         pw->dim = isl_dim_move(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
 744         if (!pw->dim)
 745                 goto error;
 746
 747         for (i = 0; i < pw->n; ++i) {
 748                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
 749                                                 dst_type, dst_pos,
 750                                                 src_type, src_pos, n);
 751                 if (!pw->p[i].set)
 752                         goto error;
 753                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
 754                                         dst_type, dst_pos, src_type, src_pos, n);
 755                 if (!pw->p[i].FIELD)
 756                         goto error;
 757         }
 758
 759         return pw;
 760 error:
 761         FN(PW,free)(pw);
 762         return NULL;
 763 }