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         hull = isl_set_simple_hull(isl_set_copy(context));
 405
 406         pw = FN(PW,cow)(pw);
 407         if (!pw)
 408                 goto error;
 409
 410         for (i = 0; i < pw->n; ++i) {
 411                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 412                                                 isl_basic_set_copy(hull));
 413                 if (!pw->p[i].set)
 414                         goto error;
 415         }
 416
 417         isl_basic_set_free(hull);
 418         isl_set_free(context);
 419
 420         return pw;
 421 error:
 422         FN(PW,free)(pw);
 423         isl_basic_set_free(hull);
 424         isl_set_free(context);
 425         return NULL;
 426 }
 427
 428 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 429 {
 430         int i, j;
 431
 432         if (!pw)
 433                 return NULL;
 434         if (pw->n == 0)
 435                 return pw;
 436
 437         for (i = pw->n - 1; i >= 0; --i) {
 438                 for (j = i - 1; j >= 0; --j) {
 439                         if (!FN(EL,is_equal)(pw->p[i].FIELD, pw->p[j].FIELD))
 440                                 continue;
 441                         pw->p[j].set = isl_set_union(pw->p[j].set,
 442                                                         pw->p[i].set);
 443                         FN(EL,free)(pw->p[i].FIELD);
 444                         if (i != pw->n - 1)
 445                                 pw->p[i] = pw->p[pw->n - 1];
 446                         pw->n--;
 447                         break;
 448                 }
 449                 if (j >= 0)
 450                         continue;
 451                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 452                 if (!pw->p[i].set)
 453                         goto error;
 454         }
 455
 456         return pw;
 457 error:
 458         FN(PW,free)(pw);
 459         return NULL;
 460 }
 461
 462 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 463 {
 464         return pw ? pw->dim->ctx : NULL;
 465 }
 466
 467 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 468         unsigned first, unsigned n)
 469 {
 470         int i;
 471
 472         if (!pw)
 473                 return -1;
 474         if (pw->n == 0 || n == 0)
 475                 return 0;
 476         for (i = 0; i < pw->n; ++i) {
 477                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 478                                                         type, first, n);
 479                 if (involves < 0 || involves)
 480                         return involves;
 481         }
 482         return 0;
 483 }
 484
 485 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 486         enum isl_dim_type type, unsigned first, unsigned n)
 487 {
 488         int i;
 489
 490         if (!pw)
 491                 return NULL;
 492         if (n == 0 && !isl_dim_get_tuple_name(pw->dim, type))
 493                 return pw;
 494
 495         pw = FN(PW,cow)(pw);
 496         if (!pw)
 497                 return NULL;
 498         pw->dim = isl_dim_drop(pw->dim, type, first, n);
 499         if (!pw->dim)
 500                 goto error;
 501         for (i = 0; i < pw->n; ++i) {
 502                 pw->p[i].set = isl_set_drop(pw->p[i].set, type, first, n);
 503                 if (!pw->p[i].set)
 504                         goto error;
 505                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 506                 if (!pw->p[i].FIELD)
 507                         goto error;
 508         }
 509
 510         return pw;
 511 error:
 512         FN(PW,free)(pw);
 513         return NULL;
 514 }
 515
 516 __isl_give PW *FN(PW,insert_dims)(__isl_take PW *pw, enum isl_dim_type type,
 517         unsigned first, unsigned n)
 518 {
 519         int i;
 520
 521         if (!pw)
 522                 return NULL;
 523         if (n == 0 && !isl_dim_is_named_or_nested(pw->dim, type))
 524                 return pw;
 525
 526         pw = FN(PW,cow)(pw);
 527         if (!pw)
 528                 return NULL;
 529
 530         pw->dim = isl_dim_insert(pw->dim, type, first, n);
 531         if (!pw->dim)
 532                 goto error;
 533
 534         for (i = 0; i < pw->n; ++i) {
 535                 pw->p[i].set = isl_set_insert(pw->p[i].set, type, first, n);
 536                 if (!pw->p[i].set)
 537                         goto error;
 538                 pw->p[i].FIELD = FN(EL,insert_dims)(pw->p[i].FIELD,
 539                                                                 type, first, n);
 540                 if (!pw->p[i].FIELD)
 541                         goto error;
 542         }
 543
 544         return pw;
 545 error:
 546         FN(PW,free)(pw);
 547         return NULL;
 548 }
 549
 550 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
 551         enum isl_dim_type type, unsigned pos, isl_int v)
 552 {
 553         int i;
 554
 555         if (!pw)
 556                 return NULL;
 557
 558         pw = FN(PW,cow)(pw);
 559         if (!pw)
 560                 return NULL;
 561         for (i = 0; i < pw->n; ++i) {
 562                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
 563                 if (!pw->p[i].set)
 564                         goto error;
 565         }
 566
 567         return pw;
 568 error:
 569         FN(PW,free)(pw);
 570         return NULL;
 571 }
 572
 573 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
 574 {
 575         return pw ? isl_dim_size(pw->dim, type) : 0;
 576 }
 577
 578 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
 579         enum isl_dim_type type, unsigned first, unsigned n)
 580 {
 581         int i;
 582
 583         if (!pw)
 584                 return NULL;
 585         if (n == 0)
 586                 return pw;
 587
 588         pw = FN(PW,cow)(pw);
 589         if (!pw)
 590                 return NULL;
 591         if (!pw->dim)
 592                 goto error;
 593         for (i = 0; i < pw->n; ++i) {
 594                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
 595                 if (!pw->p[i].set)
 596                         goto error;
 597         }
 598
 599         return pw;
 600 error:
 601         FN(PW,free)(pw);
 602         return NULL;
 603 }
 604
 605 /* Compute the maximal value attained by the piecewise quasipolynomial
 606  * on its domain or zero if the domain is empty.
 607  * In the worst case, the domain is scanned completely,
 608  * so the domain is assumed to be bounded.
 609  */
 610 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
 611 {
 612         int i;
 613         isl_qpolynomial *opt;
 614
 615         if (!pw)
 616                 return NULL;
 617
 618         if (pw->n == 0) {
 619                 isl_dim *dim = isl_dim_copy(pw->dim);
 620                 FN(PW,free)(pw);
 621                 return isl_qpolynomial_zero(dim);
 622         }
 623
 624         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
 625                                         isl_set_copy(pw->p[0].set), max);
 626         for (i = 1; i < pw->n; ++i) {
 627                 isl_qpolynomial *opt_i;
 628                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
 629                                                 isl_set_copy(pw->p[i].set), max);
 630                 if (max)
 631                         opt = isl_qpolynomial_max_cst(opt, opt_i);
 632                 else
 633                         opt = isl_qpolynomial_min_cst(opt, opt_i);
 634         }
 635
 636         FN(PW,free)(pw);
 637         return opt;
 638 }
 639
 640 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
 641 {
 642         return FN(PW,opt)(pw, 1);
 643 }
 644
 645 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
 646 {
 647         return FN(PW,opt)(pw, 0);
 648 }
 649
 650 __isl_give isl_dim *FN(PW,get_dim)(__isl_keep PW *pw)
 651 {
 652         return pw ? isl_dim_copy(pw->dim) : NULL;
 653 }
 654
 655 __isl_give PW *FN(PW,reset_dim)(__isl_take PW *pw, __isl_take isl_dim *dim)
 656 {
 657         int i;
 658
 659         pw = FN(PW,cow)(pw);
 660         if (!pw || !dim)
 661                 goto error;
 662
 663         for (i = 0; i < pw->n; ++i) {
 664                 pw->p[i].set = isl_set_reset_dim(pw->p[i].set,
 665                                                  isl_dim_copy(dim));
 666                 if (!pw->p[i].set)
 667                         goto error;
 668                 pw->p[i].FIELD = FN(EL,reset_dim)(pw->p[i].FIELD,
 669                                                   isl_dim_copy(dim));
 670                 if (!pw->p[i].FIELD)
 671                         goto error;
 672         }
 673         isl_dim_free(pw->dim);
 674         pw->dim = dim;
 675
 676         return pw;
 677 error:
 678         isl_dim_free(dim);
 679         FN(PW,free)(pw);
 680         return NULL;
 681 }
 682
 683 int FN(PW,has_equal_dim)(__isl_keep PW *pw1, __isl_keep PW *pw2)
 684 {
 685         if (!pw1 || !pw2)
 686                 return -1;
 687
 688         return isl_dim_equal(pw1->dim, pw2->dim);
 689 }
 690
 691 __isl_give PW *FN(PW,morph)(__isl_take PW *pw, __isl_take isl_morph *morph)
 692 {
 693         int i;
 694
 695         if (!pw || !morph)
 696                 goto error;
 697
 698         isl_assert(pw->dim->ctx, isl_dim_equal(pw->dim, morph->dom->dim),
 699                 goto error);
 700
 701         pw = FN(PW,cow)(pw);
 702         if (!pw)
 703                 goto error;
 704         isl_dim_free(pw->dim);
 705         pw->dim = isl_dim_copy(morph->ran->dim);
 706         if (!pw->dim)
 707                 goto error;
 708
 709         for (i = 0; i < pw->n; ++i) {
 710                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
 711                 if (!pw->p[i].set)
 712                         goto error;
 713                 pw->p[i].FIELD = FN(EL,morph)(pw->p[i].FIELD,
 714                                                 isl_morph_copy(morph));
 715                 if (!pw->p[i].FIELD)
 716                         goto error;
 717         }
 718
 719         isl_morph_free(morph);
 720
 721         return pw;
 722 error:
 723         FN(PW,free)(pw);
 724         isl_morph_free(morph);
 725         return NULL;
 726 }
 727
 728 int FN(PW,foreach_piece)(__isl_keep PW *pw,
 729         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
 730         void *user)
 731 {
 732         int i;
 733
 734         if (!pw)
 735                 return -1;
 736
 737         for (i = 0; i < pw->n; ++i)
 738                 if (fn(isl_set_copy(pw->p[i].set),
 739                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
 740                         return -1;
 741
 742         return 0;
 743 }
 744
 745 static int any_divs(__isl_keep isl_set *set)
 746 {
 747         int i;
 748
 749         if (!set)
 750                 return -1;
 751
 752         for (i = 0; i < set->n; ++i)
 753                 if (set->p[i]->n_div > 0)
 754                         return 1;
 755
 756         return 0;
 757 }
 758
 759 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
 760         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 761                     void *user), void *user)
 762 {
 763         int i;
 764
 765         if (!set || !el)
 766                 goto error;
 767
 768         for (i = 0; i < set->n; ++i) {
 769                 isl_set *lift;
 770                 EL *copy;
 771
 772                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
 773                 lift = isl_set_lift(lift);
 774
 775                 copy = FN(EL,copy)(el);
 776                 copy = FN(EL,lift)(copy, isl_set_get_dim(lift));
 777
 778                 if (fn(lift, copy, user) < 0)
 779                         goto error;
 780         }
 781
 782         isl_set_free(set);
 783         FN(EL,free)(el);
 784
 785         return 0;
 786 error:
 787         isl_set_free(set);
 788         FN(EL,free)(el);
 789         return -1;
 790 }
 791
 792 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
 793         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 794                     void *user), void *user)
 795 {
 796         int i;
 797
 798         if (!pw)
 799                 return -1;
 800
 801         for (i = 0; i < pw->n; ++i) {
 802                 isl_set *set;
 803                 EL *el;
 804
 805                 set = isl_set_copy(pw->p[i].set);
 806                 el = FN(EL,copy)(pw->p[i].FIELD);
 807                 if (!any_divs(set)) {
 808                         if (fn(set, el, user) < 0)
 809                                 return -1;
 810                         continue;
 811                 }
 812                 if (foreach_lifted_subset(set, el, fn, user) < 0)
 813                         return -1;
 814         }
 815
 816         return 0;
 817 }
 818
 819 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
 820         enum isl_dim_type dst_type, unsigned dst_pos,
 821         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 822 {
 823         int i;
 824
 825         pw = FN(PW,cow)(pw);
 826         if (!pw)
 827                 return NULL;
 828
 829         pw->dim = isl_dim_move(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
 830         if (!pw->dim)
 831                 goto error;
 832
 833         for (i = 0; i < pw->n; ++i) {
 834                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
 835                                                 dst_type, dst_pos,
 836                                                 src_type, src_pos, n);
 837                 if (!pw->p[i].set)
 838                         goto error;
 839                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
 840                                         dst_type, dst_pos, src_type, src_pos, n);
 841                 if (!pw->p[i].FIELD)
 842                         goto error;
 843         }
 844
 845         return pw;
 846 error:
 847         FN(PW,free)(pw);
 848         return NULL;
 849 }