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 static __isl_give PW *FN(PW,alloc_)(__isl_take isl_dim *dim,
   8         enum isl_fold type, int n)
   9 #else
  10 static __isl_give PW *FN(PW,alloc_)(__isl_take isl_dim *dim, int n)
  11 #endif
  12 {
  13         struct PW *pw;
  14
  15         if (!dim)
  16                 return NULL;
  17         isl_assert(dim->ctx, n >= 0, goto error);
  18         pw = isl_alloc(dim->ctx, struct PW,
  19                         sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
  20         if (!pw)
  21                 goto error;
  22
  23         pw->ref = 1;
  24 #ifdef HAS_TYPE
  25         pw->type = type;
  26 #endif
  27         pw->size = n;
  28         pw->n = 0;
  29         pw->dim = dim;
  30         return pw;
  31 error:
  32         isl_dim_free(dim);
  33         return NULL;
  34 }
  35
  36 #ifdef HAS_TYPE
  37 __isl_give PW *FN(PW,zero)(__isl_take isl_dim *dim, enum isl_fold type)
  38 {
  39         return FN(PW,alloc_)(dim, type, 0);
  40 }
  41 #else
  42 __isl_give PW *FN(PW,zero)(__isl_take isl_dim *dim)
  43 {
  44         return FN(PW,alloc_)(dim, 0);
  45 }
  46 #endif
  47
  48 __isl_give PW *FN(PW,add_piece)(__isl_take PW *pw,
  49         __isl_take isl_set *set, __isl_take EL *el)
  50 {
  51         if (!pw || !set || !el)
  52                 goto error;
  53
  54         if (isl_set_fast_is_empty(set) || FN(EL,IS_ZERO)(el)) {
  55                 isl_set_free(set);
  56                 FN(EL,free)(el);
  57                 return pw;
  58         }
  59
  60 #ifdef HAS_TYPE
  61         if (pw->type != el->type)
  62                 isl_die(set->ctx, isl_error_invalid, "fold types don't match",
  63                         goto error);
  64 #endif
  65         isl_assert(set->ctx, isl_dim_equal(pw->dim, el->dim), goto error);
  66         isl_assert(set->ctx, pw->n < pw->size, goto error);
  67
  68         pw->p[pw->n].set = set;
  69         pw->p[pw->n].FIELD = el;
  70         pw->n++;
  71
  72         return pw;
  73 error:
  74         FN(PW,free)(pw);
  75         isl_set_free(set);
  76         FN(EL,free)(el);
  77         return NULL;
  78 }
  79
  80 #ifdef HAS_TYPE
  81 __isl_give PW *FN(PW,alloc)(enum isl_fold type,
  82         __isl_take isl_set *set, __isl_take EL *el)
  83 #else
  84 __isl_give PW *FN(PW,alloc)(__isl_take isl_set *set, __isl_take EL *el)
  85 #endif
  86 {
  87         PW *pw;
  88
  89         if (!set || !el)
  90                 goto error;
  91
  92 #ifdef HAS_TYPE
  93         pw = FN(PW,alloc_)(isl_set_get_dim(set), type, 1);
  94 #else
  95         pw = FN(PW,alloc_)(isl_set_get_dim(set), 1);
  96 #endif
  97
  98         return FN(PW,add_piece)(pw, set, el);
  99 error:
 100         isl_set_free(set);
 101         FN(EL,free)(el);
 102         return NULL;
 103 }
 104
 105 __isl_give PW *FN(PW,dup)(__isl_keep PW *pw)
 106 {
 107         int i;
 108         PW *dup;
 109
 110         if (!pw)
 111                 return NULL;
 112
 113 #ifdef HAS_TYPE
 114         dup = FN(PW,alloc_)(isl_dim_copy(pw->dim), pw->type, pw->n);
 115 #else
 116         dup = FN(PW,alloc_)(isl_dim_copy(pw->dim), pw->n);
 117 #endif
 118         if (!dup)
 119                 return NULL;
 120
 121         for (i = 0; i < pw->n; ++i)
 122                 dup = FN(PW,add_piece)(dup, isl_set_copy(pw->p[i].set),
 123                                             FN(EL,copy)(pw->p[i].FIELD));
 124
 125         return dup;
 126 error:
 127         FN(PW,free)(dup);
 128         return NULL;
 129 }
 130
 131 __isl_give PW *FN(PW,cow)(__isl_take PW *pw)
 132 {
 133         if (!pw)
 134                 return NULL;
 135
 136         if (pw->ref == 1)
 137                 return pw;
 138         pw->ref--;
 139         return FN(PW,dup)(pw);
 140 }
 141
 142 __isl_give PW *FN(PW,copy)(__isl_keep PW *pw)
 143 {
 144         if (!pw)
 145                 return NULL;
 146
 147         pw->ref++;
 148         return pw;
 149 }
 150
 151 void FN(PW,free)(__isl_take PW *pw)
 152 {
 153         int i;
 154
 155         if (!pw)
 156                 return;
 157         if (--pw->ref > 0)
 158                 return;
 159
 160         for (i = 0; i < pw->n; ++i) {
 161                 isl_set_free(pw->p[i].set);
 162                 FN(EL,free)(pw->p[i].FIELD);
 163         }
 164         isl_dim_free(pw->dim);
 165         free(pw);
 166 }
 167
 168 int FN(PW,is_zero)(__isl_keep PW *pw)
 169 {
 170         if (!pw)
 171                 return -1;
 172
 173         return pw->n == 0;
 174 }
 175
 176 __isl_give PW *FN(PW,add)(__isl_take PW *pw1, __isl_take PW *pw2)
 177 {
 178         int i, j, n;
 179         struct PW *res;
 180         isl_set *set;
 181
 182         if (!pw1 || !pw2)
 183                 goto error;
 184
 185 #ifdef HAS_TYPE
 186         if (pw1->type != pw2->type)
 187                 isl_die(pw1->dim->ctx, isl_error_invalid,
 188                         "fold types don't match", goto error);
 189 #endif
 190         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
 191
 192         if (FN(PW,is_zero)(pw1)) {
 193                 FN(PW,free)(pw1);
 194                 return pw2;
 195         }
 196
 197         if (FN(PW,is_zero)(pw2)) {
 198                 FN(PW,free)(pw2);
 199                 return pw1;
 200         }
 201
 202         n = (pw1->n + 1) * (pw2->n + 1);
 203 #ifdef HAS_TYPE
 204         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->type, n);
 205 #else
 206         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), n);
 207 #endif
 208
 209         for (i = 0; i < pw1->n; ++i) {
 210                 set = isl_set_copy(pw1->p[i].set);
 211                 for (j = 0; j < pw2->n; ++j) {
 212                         struct isl_set *common;
 213                         EL *sum;
 214                         set = isl_set_subtract(set,
 215                                         isl_set_copy(pw2->p[j].set));
 216                         common = isl_set_intersect(isl_set_copy(pw1->p[i].set),
 217                                                 isl_set_copy(pw2->p[j].set));
 218                         if (isl_set_fast_is_empty(common)) {
 219                                 isl_set_free(common);
 220                                 continue;
 221                         }
 222
 223                         sum = FN(EL,add_on_domain)(common,
 224                                                    FN(EL,copy)(pw1->p[i].FIELD),
 225                                                    FN(EL,copy)(pw2->p[j].FIELD));
 226
 227                         res = FN(PW,add_piece)(res, common, sum);
 228                 }
 229                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw1->p[i].FIELD));
 230         }
 231
 232         for (j = 0; j < pw2->n; ++j) {
 233                 set = isl_set_copy(pw2->p[j].set);
 234                 for (i = 0; i < pw1->n; ++i)
 235                         set = isl_set_subtract(set,
 236                                         isl_set_copy(pw1->p[i].set));
 237                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw2->p[j].FIELD));
 238         }
 239
 240         FN(PW,free)(pw1);
 241         FN(PW,free)(pw2);
 242
 243         return res;
 244 error:
 245         FN(PW,free)(pw1);
 246         FN(PW,free)(pw2);
 247         return NULL;
 248 }
 249
 250 __isl_give PW *FN(PW,add_disjoint)(__isl_take PW *pw1, __isl_take PW *pw2)
 251 {
 252         int i;
 253         PW *res;
 254
 255         if (!pw1 || !pw2)
 256                 goto error;
 257
 258 #ifdef HAS_TYPE
 259         if (pw1->type != pw2->type)
 260                 isl_die(pw1->dim->ctx, isl_error_invalid,
 261                         "fold types don't match", goto error);
 262 #endif
 263         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
 264
 265         if (FN(PW,is_zero)(pw1)) {
 266                 FN(PW,free)(pw1);
 267                 return pw2;
 268         }
 269
 270         if (FN(PW,is_zero)(pw2)) {
 271                 FN(PW,free)(pw2);
 272                 return pw1;
 273         }
 274
 275 #ifdef HAS_TYPE
 276         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->type, pw1->n + pw2->n);
 277 #else
 278         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->n + pw2->n);
 279 #endif
 280
 281         for (i = 0; i < pw1->n; ++i)
 282                 res = FN(PW,add_piece)(res,
 283                                 isl_set_copy(pw1->p[i].set),
 284                                 FN(EL,copy)(pw1->p[i].FIELD));
 285
 286         for (i = 0; i < pw2->n; ++i)
 287                 res = FN(PW,add_piece)(res,
 288                                 isl_set_copy(pw2->p[i].set),
 289                                 FN(EL,copy)(pw2->p[i].FIELD));
 290
 291         FN(PW,free)(pw1);
 292         FN(PW,free)(pw2);
 293
 294         return res;
 295 error:
 296         FN(PW,free)(pw1);
 297         FN(PW,free)(pw2);
 298         return NULL;
 299 }
 300
 301 __isl_give isl_qpolynomial *FN(PW,eval)(__isl_take PW *pw,
 302         __isl_take isl_point *pnt)
 303 {
 304         int i;
 305         int found = 0;
 306         isl_qpolynomial *qp;
 307
 308         if (!pw || !pnt)
 309                 goto error;
 310         isl_assert(pnt->dim->ctx, isl_dim_equal(pnt->dim, pw->dim), goto error);
 311
 312         for (i = 0; i < pw->n; ++i) {
 313                 found = isl_set_contains_point(pw->p[i].set, pnt);
 314                 if (found < 0)
 315                         goto error;
 316                 if (found)
 317                         break;
 318         }
 319         if (found)
 320                 qp = FN(EL,eval)(FN(EL,copy)(pw->p[i].FIELD),
 321                                             isl_point_copy(pnt));
 322         else
 323                 qp = isl_qpolynomial_zero(isl_dim_copy(pw->dim));
 324         FN(PW,free)(pw);
 325         isl_point_free(pnt);
 326         return qp;
 327 error:
 328         FN(PW,free)(pw);
 329         isl_point_free(pnt);
 330         return NULL;
 331 }
 332
 333 __isl_give isl_set *FN(PW,domain)(__isl_take PW *pw)
 334 {
 335         int i;
 336         isl_set *dom;
 337
 338         if (!pw)
 339                 return NULL;
 340
 341         dom = isl_set_empty(isl_dim_copy(pw->dim));
 342         for (i = 0; i < pw->n; ++i)
 343                 dom = isl_set_union_disjoint(dom, isl_set_copy(pw->p[i].set));
 344
 345         FN(PW,free)(pw);
 346
 347         return dom;
 348 }
 349
 350 __isl_give PW *FN(PW,intersect_domain)(__isl_take PW *pw, __isl_take isl_set *set)
 351 {
 352         int i;
 353
 354         if (!pw || !set)
 355                 goto error;
 356
 357         if (pw->n == 0) {
 358                 isl_set_free(set);
 359                 return pw;
 360         }
 361
 362         pw = FN(PW,cow)(pw);
 363         if (!pw)
 364                 goto error;
 365
 366         for (i = pw->n - 1; i >= 0; --i) {
 367                 isl_basic_set *aff;
 368                 pw->p[i].set = isl_set_intersect(pw->p[i].set, isl_set_copy(set));
 369                 if (!pw->p[i].set)
 370                         goto error;
 371                 aff = isl_set_affine_hull(isl_set_copy(pw->p[i].set));
 372                 pw->p[i].FIELD = FN(EL,substitute_equalities)(pw->p[i].FIELD,
 373                                                                 aff);
 374                 if (isl_set_fast_is_empty(pw->p[i].set)) {
 375                         isl_set_free(pw->p[i].set);
 376                         FN(EL,free)(pw->p[i].FIELD);
 377                         if (i != pw->n - 1)
 378                                 pw->p[i] = pw->p[pw->n - 1];
 379                         pw->n--;
 380                 }
 381         }
 382
 383         isl_set_free(set);
 384         return pw;
 385 error:
 386         isl_set_free(set);
 387         FN(PW,free)(pw);
 388         return NULL;
 389 }
 390
 391 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
 392 {
 393         int i;
 394         isl_basic_set *hull = NULL;
 395
 396         if (!pw || !context)
 397                 goto error;
 398
 399         if (pw->n == 0) {
 400                 isl_set_free(context);
 401                 return pw;
 402         }
 403
 404         context = isl_set_compute_divs(context);
 405         hull = isl_set_simple_hull(isl_set_copy(context));
 406
 407         pw = FN(PW,cow)(pw);
 408         if (!pw)
 409                 goto error;
 410
 411         for (i = pw->n - 1; i >= 0; --i) {
 412                 isl_basic_set *aff;
 413                 pw->p[i].set = isl_set_intersect(pw->p[i].set,
 414                                                  isl_set_copy(context));
 415                 if (!pw->p[i].set)
 416                         goto error;
 417                 aff = isl_set_affine_hull(isl_set_copy(pw->p[i].set));
 418                 pw->p[i].FIELD = FN(EL,substitute_equalities)(pw->p[i].FIELD,
 419                                                                 aff);
 420                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 421                                                 isl_basic_set_copy(hull));
 422                 if (!pw->p[i].set)
 423                         goto error;
 424                 if (isl_set_fast_is_empty(pw->p[i].set)) {
 425                         isl_set_free(pw->p[i].set);
 426                         FN(EL,free)(pw->p[i].FIELD);
 427                         if (i != pw->n - 1)
 428                                 pw->p[i] = pw->p[pw->n - 1];
 429                         pw->n--;
 430                 }
 431         }
 432
 433         isl_basic_set_free(hull);
 434         isl_set_free(context);
 435
 436         return pw;
 437 error:
 438         FN(PW,free)(pw);
 439         isl_basic_set_free(hull);
 440         isl_set_free(context);
 441         return NULL;
 442 }
 443
 444 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 445 {
 446         int i, j;
 447
 448         if (!pw)
 449                 return NULL;
 450         if (pw->n == 0)
 451                 return pw;
 452
 453         for (i = pw->n - 1; i >= 0; --i) {
 454                 for (j = i - 1; j >= 0; --j) {
 455                         if (!FN(EL,is_equal)(pw->p[i].FIELD, pw->p[j].FIELD))
 456                                 continue;
 457                         pw->p[j].set = isl_set_union(pw->p[j].set,
 458                                                         pw->p[i].set);
 459                         FN(EL,free)(pw->p[i].FIELD);
 460                         if (i != pw->n - 1)
 461                                 pw->p[i] = pw->p[pw->n - 1];
 462                         pw->n--;
 463                         break;
 464                 }
 465                 if (j >= 0)
 466                         continue;
 467                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 468                 if (!pw->p[i].set)
 469                         goto error;
 470         }
 471
 472         return pw;
 473 error:
 474         FN(PW,free)(pw);
 475         return NULL;
 476 }
 477
 478 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 479 {
 480         return pw ? pw->dim->ctx : NULL;
 481 }
 482
 483 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 484         unsigned first, unsigned n)
 485 {
 486         int i;
 487
 488         if (!pw)
 489                 return -1;
 490         if (pw->n == 0 || n == 0)
 491                 return 0;
 492         for (i = 0; i < pw->n; ++i) {
 493                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 494                                                         type, first, n);
 495                 if (involves < 0 || involves)
 496                         return involves;
 497         }
 498         return 0;
 499 }
 500
 501 __isl_give PW *FN(PW,set_dim_name)(__isl_take PW *pw,
 502         enum isl_dim_type type, unsigned pos, const char *s)
 503 {
 504         int i;
 505
 506         pw = FN(PW,cow)(pw);
 507         if (!pw)
 508                 return NULL;
 509
 510         pw->dim = isl_dim_set_name(pw->dim, type, pos, s);
 511         if (!pw->dim)
 512                 goto error;
 513
 514         for (i = 0; i < pw->n; ++i) {
 515                 pw->p[i].set = isl_set_set_dim_name(pw->p[i].set, type, pos, s);
 516                 if (!pw->p[i].set)
 517                         goto error;
 518                 pw->p[i].FIELD = FN(EL,set_dim_name)(pw->p[i].FIELD, type, pos, s);
 519                 if (!pw->p[i].FIELD)
 520                         goto error;
 521         }
 522
 523         return pw;
 524 error:
 525         FN(PW,free)(pw);
 526         return NULL;
 527 }
 528
 529 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 530         enum isl_dim_type type, unsigned first, unsigned n)
 531 {
 532         int i;
 533
 534         if (!pw)
 535                 return NULL;
 536         if (n == 0 && !isl_dim_get_tuple_name(pw->dim, type))
 537                 return pw;
 538
 539         pw = FN(PW,cow)(pw);
 540         if (!pw)
 541                 return NULL;
 542         pw->dim = isl_dim_drop(pw->dim, type, first, n);
 543         if (!pw->dim)
 544                 goto error;
 545         for (i = 0; i < pw->n; ++i) {
 546                 pw->p[i].set = isl_set_drop(pw->p[i].set, type, first, n);
 547                 if (!pw->p[i].set)
 548                         goto error;
 549                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 550                 if (!pw->p[i].FIELD)
 551                         goto error;
 552         }
 553
 554         return pw;
 555 error:
 556         FN(PW,free)(pw);
 557         return NULL;
 558 }
 559
 560 __isl_give PW *FN(PW,insert_dims)(__isl_take PW *pw, enum isl_dim_type type,
 561         unsigned first, unsigned n)
 562 {
 563         int i;
 564
 565         if (!pw)
 566                 return NULL;
 567         if (n == 0 && !isl_dim_is_named_or_nested(pw->dim, type))
 568                 return pw;
 569
 570         pw = FN(PW,cow)(pw);
 571         if (!pw)
 572                 return NULL;
 573
 574         pw->dim = isl_dim_insert(pw->dim, type, first, n);
 575         if (!pw->dim)
 576                 goto error;
 577
 578         for (i = 0; i < pw->n; ++i) {
 579                 pw->p[i].set = isl_set_insert(pw->p[i].set, type, first, n);
 580                 if (!pw->p[i].set)
 581                         goto error;
 582                 pw->p[i].FIELD = FN(EL,insert_dims)(pw->p[i].FIELD,
 583                                                                 type, first, n);
 584                 if (!pw->p[i].FIELD)
 585                         goto error;
 586         }
 587
 588         return pw;
 589 error:
 590         FN(PW,free)(pw);
 591         return NULL;
 592 }
 593
 594 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
 595         enum isl_dim_type type, unsigned pos, isl_int v)
 596 {
 597         int i;
 598
 599         if (!pw)
 600                 return NULL;
 601
 602         pw = FN(PW,cow)(pw);
 603         if (!pw)
 604                 return NULL;
 605         for (i = 0; i < pw->n; ++i) {
 606                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
 607                 if (!pw->p[i].set)
 608                         goto error;
 609         }
 610
 611         return pw;
 612 error:
 613         FN(PW,free)(pw);
 614         return NULL;
 615 }
 616
 617 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
 618 {
 619         return pw ? isl_dim_size(pw->dim, type) : 0;
 620 }
 621
 622 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
 623         enum isl_dim_type type, unsigned first, unsigned n)
 624 {
 625         int i;
 626
 627         if (!pw)
 628                 return NULL;
 629         if (n == 0)
 630                 return pw;
 631
 632         pw = FN(PW,cow)(pw);
 633         if (!pw)
 634                 return NULL;
 635         if (!pw->dim)
 636                 goto error;
 637         for (i = 0; i < pw->n; ++i) {
 638                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
 639                 if (!pw->p[i].set)
 640                         goto error;
 641         }
 642
 643         return pw;
 644 error:
 645         FN(PW,free)(pw);
 646         return NULL;
 647 }
 648
 649 /* Compute the maximal value attained by the piecewise quasipolynomial
 650  * on its domain or zero if the domain is empty.
 651  * In the worst case, the domain is scanned completely,
 652  * so the domain is assumed to be bounded.
 653  */
 654 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
 655 {
 656         int i;
 657         isl_qpolynomial *opt;
 658
 659         if (!pw)
 660                 return NULL;
 661
 662         if (pw->n == 0) {
 663                 isl_dim *dim = isl_dim_copy(pw->dim);
 664                 FN(PW,free)(pw);
 665                 return isl_qpolynomial_zero(dim);
 666         }
 667
 668         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
 669                                         isl_set_copy(pw->p[0].set), max);
 670         for (i = 1; i < pw->n; ++i) {
 671                 isl_qpolynomial *opt_i;
 672                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
 673                                                 isl_set_copy(pw->p[i].set), max);
 674                 if (max)
 675                         opt = isl_qpolynomial_max_cst(opt, opt_i);
 676                 else
 677                         opt = isl_qpolynomial_min_cst(opt, opt_i);
 678         }
 679
 680         FN(PW,free)(pw);
 681         return opt;
 682 }
 683
 684 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
 685 {
 686         return FN(PW,opt)(pw, 1);
 687 }
 688
 689 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
 690 {
 691         return FN(PW,opt)(pw, 0);
 692 }
 693
 694 __isl_give isl_dim *FN(PW,get_dim)(__isl_keep PW *pw)
 695 {
 696         return pw ? isl_dim_copy(pw->dim) : NULL;
 697 }
 698
 699 __isl_give PW *FN(PW,reset_dim)(__isl_take PW *pw, __isl_take isl_dim *dim)
 700 {
 701         int i;
 702
 703         pw = FN(PW,cow)(pw);
 704         if (!pw || !dim)
 705                 goto error;
 706
 707         for (i = 0; i < pw->n; ++i) {
 708                 pw->p[i].set = isl_set_reset_dim(pw->p[i].set,
 709                                                  isl_dim_copy(dim));
 710                 if (!pw->p[i].set)
 711                         goto error;
 712                 pw->p[i].FIELD = FN(EL,reset_dim)(pw->p[i].FIELD,
 713                                                   isl_dim_copy(dim));
 714                 if (!pw->p[i].FIELD)
 715                         goto error;
 716         }
 717         isl_dim_free(pw->dim);
 718         pw->dim = dim;
 719
 720         return pw;
 721 error:
 722         isl_dim_free(dim);
 723         FN(PW,free)(pw);
 724         return NULL;
 725 }
 726
 727 int FN(PW,has_equal_dim)(__isl_keep PW *pw1, __isl_keep PW *pw2)
 728 {
 729         if (!pw1 || !pw2)
 730                 return -1;
 731
 732         return isl_dim_equal(pw1->dim, pw2->dim);
 733 }
 734
 735 __isl_give PW *FN(PW,morph)(__isl_take PW *pw, __isl_take isl_morph *morph)
 736 {
 737         int i;
 738
 739         if (!pw || !morph)
 740                 goto error;
 741
 742         isl_assert(pw->dim->ctx, isl_dim_equal(pw->dim, morph->dom->dim),
 743                 goto error);
 744
 745         pw = FN(PW,cow)(pw);
 746         if (!pw)
 747                 goto error;
 748         isl_dim_free(pw->dim);
 749         pw->dim = isl_dim_copy(morph->ran->dim);
 750         if (!pw->dim)
 751                 goto error;
 752
 753         for (i = 0; i < pw->n; ++i) {
 754                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
 755                 if (!pw->p[i].set)
 756                         goto error;
 757                 pw->p[i].FIELD = FN(EL,morph)(pw->p[i].FIELD,
 758                                                 isl_morph_copy(morph));
 759                 if (!pw->p[i].FIELD)
 760                         goto error;
 761         }
 762
 763         isl_morph_free(morph);
 764
 765         return pw;
 766 error:
 767         FN(PW,free)(pw);
 768         isl_morph_free(morph);
 769         return NULL;
 770 }
 771
 772 int FN(PW,foreach_piece)(__isl_keep PW *pw,
 773         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
 774         void *user)
 775 {
 776         int i;
 777
 778         if (!pw)
 779                 return -1;
 780
 781         for (i = 0; i < pw->n; ++i)
 782                 if (fn(isl_set_copy(pw->p[i].set),
 783                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
 784                         return -1;
 785
 786         return 0;
 787 }
 788
 789 static int any_divs(__isl_keep isl_set *set)
 790 {
 791         int i;
 792
 793         if (!set)
 794                 return -1;
 795
 796         for (i = 0; i < set->n; ++i)
 797                 if (set->p[i]->n_div > 0)
 798                         return 1;
 799
 800         return 0;
 801 }
 802
 803 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
 804         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 805                     void *user), void *user)
 806 {
 807         int i;
 808
 809         if (!set || !el)
 810                 goto error;
 811
 812         for (i = 0; i < set->n; ++i) {
 813                 isl_set *lift;
 814                 EL *copy;
 815
 816                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
 817                 lift = isl_set_lift(lift);
 818
 819                 copy = FN(EL,copy)(el);
 820                 copy = FN(EL,lift)(copy, isl_set_get_dim(lift));
 821
 822                 if (fn(lift, copy, user) < 0)
 823                         goto error;
 824         }
 825
 826         isl_set_free(set);
 827         FN(EL,free)(el);
 828
 829         return 0;
 830 error:
 831         isl_set_free(set);
 832         FN(EL,free)(el);
 833         return -1;
 834 }
 835
 836 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
 837         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 838                     void *user), void *user)
 839 {
 840         int i;
 841
 842         if (!pw)
 843                 return -1;
 844
 845         for (i = 0; i < pw->n; ++i) {
 846                 isl_set *set;
 847                 EL *el;
 848
 849                 set = isl_set_copy(pw->p[i].set);
 850                 el = FN(EL,copy)(pw->p[i].FIELD);
 851                 if (!any_divs(set)) {
 852                         if (fn(set, el, user) < 0)
 853                                 return -1;
 854                         continue;
 855                 }
 856                 if (foreach_lifted_subset(set, el, fn, user) < 0)
 857                         return -1;
 858         }
 859
 860         return 0;
 861 }
 862
 863 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
 864         enum isl_dim_type dst_type, unsigned dst_pos,
 865         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 866 {
 867         int i;
 868
 869         pw = FN(PW,cow)(pw);
 870         if (!pw)
 871                 return NULL;
 872
 873         pw->dim = isl_dim_move(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
 874         if (!pw->dim)
 875                 goto error;
 876
 877         for (i = 0; i < pw->n; ++i) {
 878                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
 879                                                 dst_type, dst_pos,
 880                                                 src_type, src_pos, n);
 881                 if (!pw->p[i].set)
 882                         goto error;
 883                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
 884                                         dst_type, dst_pos, src_type, src_pos, n);
 885                 if (!pw->p[i].FIELD)
 886                         goto error;
 887         }
 888
 889         return pw;
 890 error:
 891         FN(PW,free)(pw);
 892         return NULL;
 893 }
 894
 895 __isl_give PW *FN(PW,realign)(__isl_take PW *pw, __isl_take isl_reordering *exp)
 896 {
 897         int i;
 898
 899         pw = FN(PW,cow)(pw);
 900         if (!pw || !exp)
 901                 return NULL;
 902
 903         for (i = 0; i < pw->n; ++i) {
 904                 pw->p[i].set = isl_set_realign(pw->p[i].set,
 905                                                     isl_reordering_copy(exp));
 906                 if (!pw->p[i].set)
 907                         goto error;
 908                 pw->p[i].FIELD = FN(EL,realign)(pw->p[i].FIELD,
 909                                                     isl_reordering_copy(exp));
 910                 if (!pw->p[i].FIELD)
 911                         goto error;
 912         }
 913
 914         pw = FN(PW,reset_dim)(pw, isl_dim_copy(exp->dim));
 915
 916         isl_reordering_free(exp);
 917         return pw;
 918 error:
 919         isl_reordering_free(exp);
 920         FN(PW,free)(pw);
 921         return NULL;
 922 }