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_plain_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 }
 127
 128 __isl_give PW *FN(PW,cow)(__isl_take PW *pw)
 129 {
 130         if (!pw)
 131                 return NULL;
 132
 133         if (pw->ref == 1)
 134                 return pw;
 135         pw->ref--;
 136         return FN(PW,dup)(pw);
 137 }
 138
 139 __isl_give PW *FN(PW,copy)(__isl_keep PW *pw)
 140 {
 141         if (!pw)
 142                 return NULL;
 143
 144         pw->ref++;
 145         return pw;
 146 }
 147
 148 void FN(PW,free)(__isl_take PW *pw)
 149 {
 150         int i;
 151
 152         if (!pw)
 153                 return;
 154         if (--pw->ref > 0)
 155                 return;
 156
 157         for (i = 0; i < pw->n; ++i) {
 158                 isl_set_free(pw->p[i].set);
 159                 FN(EL,free)(pw->p[i].FIELD);
 160         }
 161         isl_dim_free(pw->dim);
 162         free(pw);
 163 }
 164
 165 int FN(PW,is_zero)(__isl_keep PW *pw)
 166 {
 167         if (!pw)
 168                 return -1;
 169
 170         return pw->n == 0;
 171 }
 172
 173 __isl_give PW *FN(PW,add)(__isl_take PW *pw1, __isl_take PW *pw2)
 174 {
 175         int i, j, n;
 176         struct PW *res;
 177         isl_set *set;
 178
 179         if (!pw1 || !pw2)
 180                 goto error;
 181
 182 #ifdef HAS_TYPE
 183         if (pw1->type != pw2->type)
 184                 isl_die(pw1->dim->ctx, isl_error_invalid,
 185                         "fold types don't match", goto error);
 186 #endif
 187         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
 188
 189         if (FN(PW,is_zero)(pw1)) {
 190                 FN(PW,free)(pw1);
 191                 return pw2;
 192         }
 193
 194         if (FN(PW,is_zero)(pw2)) {
 195                 FN(PW,free)(pw2);
 196                 return pw1;
 197         }
 198
 199         n = (pw1->n + 1) * (pw2->n + 1);
 200 #ifdef HAS_TYPE
 201         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->type, n);
 202 #else
 203         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), n);
 204 #endif
 205
 206         for (i = 0; i < pw1->n; ++i) {
 207                 set = isl_set_copy(pw1->p[i].set);
 208                 for (j = 0; j < pw2->n; ++j) {
 209                         struct isl_set *common;
 210                         EL *sum;
 211                         set = isl_set_subtract(set,
 212                                         isl_set_copy(pw2->p[j].set));
 213                         common = isl_set_intersect(isl_set_copy(pw1->p[i].set),
 214                                                 isl_set_copy(pw2->p[j].set));
 215                         if (isl_set_plain_is_empty(common)) {
 216                                 isl_set_free(common);
 217                                 continue;
 218                         }
 219
 220                         sum = FN(EL,add_on_domain)(common,
 221                                                    FN(EL,copy)(pw1->p[i].FIELD),
 222                                                    FN(EL,copy)(pw2->p[j].FIELD));
 223
 224                         res = FN(PW,add_piece)(res, common, sum);
 225                 }
 226                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw1->p[i].FIELD));
 227         }
 228
 229         for (j = 0; j < pw2->n; ++j) {
 230                 set = isl_set_copy(pw2->p[j].set);
 231                 for (i = 0; i < pw1->n; ++i)
 232                         set = isl_set_subtract(set,
 233                                         isl_set_copy(pw1->p[i].set));
 234                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw2->p[j].FIELD));
 235         }
 236
 237         FN(PW,free)(pw1);
 238         FN(PW,free)(pw2);
 239
 240         return res;
 241 error:
 242         FN(PW,free)(pw1);
 243         FN(PW,free)(pw2);
 244         return NULL;
 245 }
 246
 247 __isl_give PW *FN(PW,add_disjoint)(__isl_take PW *pw1, __isl_take PW *pw2)
 248 {
 249         int i;
 250         PW *res;
 251
 252         if (!pw1 || !pw2)
 253                 goto error;
 254
 255 #ifdef HAS_TYPE
 256         if (pw1->type != pw2->type)
 257                 isl_die(pw1->dim->ctx, isl_error_invalid,
 258                         "fold types don't match", goto error);
 259 #endif
 260         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
 261
 262         if (FN(PW,is_zero)(pw1)) {
 263                 FN(PW,free)(pw1);
 264                 return pw2;
 265         }
 266
 267         if (FN(PW,is_zero)(pw2)) {
 268                 FN(PW,free)(pw2);
 269                 return pw1;
 270         }
 271
 272 #ifdef HAS_TYPE
 273         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->type, pw1->n + pw2->n);
 274 #else
 275         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->n + pw2->n);
 276 #endif
 277
 278         for (i = 0; i < pw1->n; ++i)
 279                 res = FN(PW,add_piece)(res,
 280                                 isl_set_copy(pw1->p[i].set),
 281                                 FN(EL,copy)(pw1->p[i].FIELD));
 282
 283         for (i = 0; i < pw2->n; ++i)
 284                 res = FN(PW,add_piece)(res,
 285                                 isl_set_copy(pw2->p[i].set),
 286                                 FN(EL,copy)(pw2->p[i].FIELD));
 287
 288         FN(PW,free)(pw1);
 289         FN(PW,free)(pw2);
 290
 291         return res;
 292 error:
 293         FN(PW,free)(pw1);
 294         FN(PW,free)(pw2);
 295         return NULL;
 296 }
 297
 298 __isl_give isl_qpolynomial *FN(PW,eval)(__isl_take PW *pw,
 299         __isl_take isl_point *pnt)
 300 {
 301         int i;
 302         int found = 0;
 303         isl_qpolynomial *qp;
 304
 305         if (!pw || !pnt)
 306                 goto error;
 307         isl_assert(pnt->dim->ctx, isl_dim_equal(pnt->dim, pw->dim), goto error);
 308
 309         for (i = 0; i < pw->n; ++i) {
 310                 found = isl_set_contains_point(pw->p[i].set, pnt);
 311                 if (found < 0)
 312                         goto error;
 313                 if (found)
 314                         break;
 315         }
 316         if (found)
 317                 qp = FN(EL,eval)(FN(EL,copy)(pw->p[i].FIELD),
 318                                             isl_point_copy(pnt));
 319         else
 320                 qp = isl_qpolynomial_zero(isl_dim_copy(pw->dim));
 321         FN(PW,free)(pw);
 322         isl_point_free(pnt);
 323         return qp;
 324 error:
 325         FN(PW,free)(pw);
 326         isl_point_free(pnt);
 327         return NULL;
 328 }
 329
 330 __isl_give isl_set *FN(PW,domain)(__isl_take PW *pw)
 331 {
 332         int i;
 333         isl_set *dom;
 334
 335         if (!pw)
 336                 return NULL;
 337
 338         dom = isl_set_empty(isl_dim_copy(pw->dim));
 339         for (i = 0; i < pw->n; ++i)
 340                 dom = isl_set_union_disjoint(dom, isl_set_copy(pw->p[i].set));
 341
 342         FN(PW,free)(pw);
 343
 344         return dom;
 345 }
 346
 347 __isl_give PW *FN(PW,intersect_domain)(__isl_take PW *pw, __isl_take isl_set *set)
 348 {
 349         int i;
 350
 351         if (!pw || !set)
 352                 goto error;
 353
 354         if (pw->n == 0) {
 355                 isl_set_free(set);
 356                 return pw;
 357         }
 358
 359         pw = FN(PW,cow)(pw);
 360         if (!pw)
 361                 goto error;
 362
 363         for (i = pw->n - 1; i >= 0; --i) {
 364                 isl_basic_set *aff;
 365                 pw->p[i].set = isl_set_intersect(pw->p[i].set, isl_set_copy(set));
 366                 if (!pw->p[i].set)
 367                         goto error;
 368                 aff = isl_set_affine_hull(isl_set_copy(pw->p[i].set));
 369                 pw->p[i].FIELD = FN(EL,substitute_equalities)(pw->p[i].FIELD,
 370                                                                 aff);
 371                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 372                         isl_set_free(pw->p[i].set);
 373                         FN(EL,free)(pw->p[i].FIELD);
 374                         if (i != pw->n - 1)
 375                                 pw->p[i] = pw->p[pw->n - 1];
 376                         pw->n--;
 377                 }
 378         }
 379
 380         isl_set_free(set);
 381         return pw;
 382 error:
 383         isl_set_free(set);
 384         FN(PW,free)(pw);
 385         return NULL;
 386 }
 387
 388 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
 389 {
 390         int i;
 391         isl_basic_set *hull = NULL;
 392
 393         if (!pw || !context)
 394                 goto error;
 395
 396         if (pw->n == 0) {
 397                 isl_set_free(context);
 398                 return pw;
 399         }
 400
 401         context = isl_set_compute_divs(context);
 402         hull = isl_set_simple_hull(isl_set_copy(context));
 403
 404         pw = FN(PW,cow)(pw);
 405         if (!pw)
 406                 goto error;
 407
 408         for (i = pw->n - 1; i >= 0; --i) {
 409                 pw->p[i].set = isl_set_intersect(pw->p[i].set,
 410                                                  isl_set_copy(context));
 411                 if (!pw->p[i].set)
 412                         goto error;
 413                 pw->p[i].FIELD = FN(EL,gist)(pw->p[i].FIELD,
 414                                              isl_set_copy(pw->p[i].set));
 415                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 416                                                 isl_basic_set_copy(hull));
 417                 if (!pw->p[i].set)
 418                         goto error;
 419                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 420                         isl_set_free(pw->p[i].set);
 421                         FN(EL,free)(pw->p[i].FIELD);
 422                         if (i != pw->n - 1)
 423                                 pw->p[i] = pw->p[pw->n - 1];
 424                         pw->n--;
 425                 }
 426         }
 427
 428         isl_basic_set_free(hull);
 429         isl_set_free(context);
 430
 431         return pw;
 432 error:
 433         FN(PW,free)(pw);
 434         isl_basic_set_free(hull);
 435         isl_set_free(context);
 436         return NULL;
 437 }
 438
 439 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 440 {
 441         int i, j;
 442
 443         if (!pw)
 444                 return NULL;
 445         if (pw->n == 0)
 446                 return pw;
 447
 448         for (i = pw->n - 1; i >= 0; --i) {
 449                 for (j = i - 1; j >= 0; --j) {
 450                         if (!FN(EL,is_equal)(pw->p[i].FIELD, pw->p[j].FIELD))
 451                                 continue;
 452                         pw->p[j].set = isl_set_union(pw->p[j].set,
 453                                                         pw->p[i].set);
 454                         FN(EL,free)(pw->p[i].FIELD);
 455                         if (i != pw->n - 1)
 456                                 pw->p[i] = pw->p[pw->n - 1];
 457                         pw->n--;
 458                         break;
 459                 }
 460                 if (j >= 0)
 461                         continue;
 462                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 463                 if (!pw->p[i].set)
 464                         goto error;
 465         }
 466
 467         return pw;
 468 error:
 469         FN(PW,free)(pw);
 470         return NULL;
 471 }
 472
 473 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 474 {
 475         return pw ? pw->dim->ctx : NULL;
 476 }
 477
 478 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 479         unsigned first, unsigned n)
 480 {
 481         int i;
 482
 483         if (!pw)
 484                 return -1;
 485         if (pw->n == 0 || n == 0)
 486                 return 0;
 487         for (i = 0; i < pw->n; ++i) {
 488                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 489                                                         type, first, n);
 490                 if (involves < 0 || involves)
 491                         return involves;
 492                 involves = isl_set_involves_dims(pw->p[i].set, type, first, n);
 493                 if (involves < 0 || involves)
 494                         return involves;
 495         }
 496         return 0;
 497 }
 498
 499 __isl_give PW *FN(PW,set_dim_name)(__isl_take PW *pw,
 500         enum isl_dim_type type, unsigned pos, const char *s)
 501 {
 502         int i;
 503
 504         pw = FN(PW,cow)(pw);
 505         if (!pw)
 506                 return NULL;
 507
 508         pw->dim = isl_dim_set_name(pw->dim, type, pos, s);
 509         if (!pw->dim)
 510                 goto error;
 511
 512         for (i = 0; i < pw->n; ++i) {
 513                 pw->p[i].set = isl_set_set_dim_name(pw->p[i].set, type, pos, s);
 514                 if (!pw->p[i].set)
 515                         goto error;
 516                 pw->p[i].FIELD = FN(EL,set_dim_name)(pw->p[i].FIELD, type, pos, s);
 517                 if (!pw->p[i].FIELD)
 518                         goto error;
 519         }
 520
 521         return pw;
 522 error:
 523         FN(PW,free)(pw);
 524         return NULL;
 525 }
 526
 527 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 528         enum isl_dim_type type, unsigned first, unsigned n)
 529 {
 530         int i;
 531
 532         if (!pw)
 533                 return NULL;
 534         if (n == 0 && !isl_dim_get_tuple_name(pw->dim, type))
 535                 return pw;
 536
 537         pw = FN(PW,cow)(pw);
 538         if (!pw)
 539                 return NULL;
 540         pw->dim = isl_dim_drop(pw->dim, type, first, n);
 541         if (!pw->dim)
 542                 goto error;
 543         for (i = 0; i < pw->n; ++i) {
 544                 pw->p[i].set = isl_set_drop(pw->p[i].set, type, first, n);
 545                 if (!pw->p[i].set)
 546                         goto error;
 547                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 548                 if (!pw->p[i].FIELD)
 549                         goto error;
 550         }
 551
 552         return pw;
 553 error:
 554         FN(PW,free)(pw);
 555         return NULL;
 556 }
 557
 558 __isl_give PW *FN(PW,insert_dims)(__isl_take PW *pw, enum isl_dim_type type,
 559         unsigned first, unsigned n)
 560 {
 561         int i;
 562
 563         if (!pw)
 564                 return NULL;
 565         if (n == 0 && !isl_dim_is_named_or_nested(pw->dim, type))
 566                 return pw;
 567
 568         pw = FN(PW,cow)(pw);
 569         if (!pw)
 570                 return NULL;
 571
 572         pw->dim = isl_dim_insert(pw->dim, type, first, n);
 573         if (!pw->dim)
 574                 goto error;
 575
 576         for (i = 0; i < pw->n; ++i) {
 577                 pw->p[i].set = isl_set_insert(pw->p[i].set, type, first, n);
 578                 if (!pw->p[i].set)
 579                         goto error;
 580                 pw->p[i].FIELD = FN(EL,insert_dims)(pw->p[i].FIELD,
 581                                                                 type, first, n);
 582                 if (!pw->p[i].FIELD)
 583                         goto error;
 584         }
 585
 586         return pw;
 587 error:
 588         FN(PW,free)(pw);
 589         return NULL;
 590 }
 591
 592 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
 593         enum isl_dim_type type, unsigned pos, isl_int v)
 594 {
 595         int i;
 596
 597         if (!pw)
 598                 return NULL;
 599
 600         pw = FN(PW,cow)(pw);
 601         if (!pw)
 602                 return NULL;
 603         for (i = 0; i < pw->n; ++i) {
 604                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
 605                 if (!pw->p[i].set)
 606                         goto error;
 607         }
 608
 609         return pw;
 610 error:
 611         FN(PW,free)(pw);
 612         return NULL;
 613 }
 614
 615 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
 616 {
 617         return pw ? isl_dim_size(pw->dim, type) : 0;
 618 }
 619
 620 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
 621         enum isl_dim_type type, unsigned first, unsigned n)
 622 {
 623         int i;
 624
 625         if (!pw)
 626                 return NULL;
 627         if (n == 0)
 628                 return pw;
 629
 630         pw = FN(PW,cow)(pw);
 631         if (!pw)
 632                 return NULL;
 633         if (!pw->dim)
 634                 goto error;
 635         for (i = 0; i < pw->n; ++i) {
 636                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
 637                 if (!pw->p[i].set)
 638                         goto error;
 639         }
 640
 641         return pw;
 642 error:
 643         FN(PW,free)(pw);
 644         return NULL;
 645 }
 646
 647 /* Compute the maximal value attained by the piecewise quasipolynomial
 648  * on its domain or zero if the domain is empty.
 649  * In the worst case, the domain is scanned completely,
 650  * so the domain is assumed to be bounded.
 651  */
 652 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
 653 {
 654         int i;
 655         isl_qpolynomial *opt;
 656
 657         if (!pw)
 658                 return NULL;
 659
 660         if (pw->n == 0) {
 661                 isl_dim *dim = isl_dim_copy(pw->dim);
 662                 FN(PW,free)(pw);
 663                 return isl_qpolynomial_zero(dim);
 664         }
 665
 666         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
 667                                         isl_set_copy(pw->p[0].set), max);
 668         for (i = 1; i < pw->n; ++i) {
 669                 isl_qpolynomial *opt_i;
 670                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
 671                                                 isl_set_copy(pw->p[i].set), max);
 672                 if (max)
 673                         opt = isl_qpolynomial_max_cst(opt, opt_i);
 674                 else
 675                         opt = isl_qpolynomial_min_cst(opt, opt_i);
 676         }
 677
 678         FN(PW,free)(pw);
 679         return opt;
 680 }
 681
 682 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
 683 {
 684         return FN(PW,opt)(pw, 1);
 685 }
 686
 687 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
 688 {
 689         return FN(PW,opt)(pw, 0);
 690 }
 691
 692 __isl_give isl_dim *FN(PW,get_dim)(__isl_keep PW *pw)
 693 {
 694         return pw ? isl_dim_copy(pw->dim) : NULL;
 695 }
 696
 697 __isl_give PW *FN(PW,reset_dim)(__isl_take PW *pw, __isl_take isl_dim *dim)
 698 {
 699         int i;
 700
 701         pw = FN(PW,cow)(pw);
 702         if (!pw || !dim)
 703                 goto error;
 704
 705         for (i = 0; i < pw->n; ++i) {
 706                 pw->p[i].set = isl_set_reset_dim(pw->p[i].set,
 707                                                  isl_dim_copy(dim));
 708                 if (!pw->p[i].set)
 709                         goto error;
 710                 pw->p[i].FIELD = FN(EL,reset_dim)(pw->p[i].FIELD,
 711                                                   isl_dim_copy(dim));
 712                 if (!pw->p[i].FIELD)
 713                         goto error;
 714         }
 715         isl_dim_free(pw->dim);
 716         pw->dim = dim;
 717
 718         return pw;
 719 error:
 720         isl_dim_free(dim);
 721         FN(PW,free)(pw);
 722         return NULL;
 723 }
 724
 725 int FN(PW,has_equal_dim)(__isl_keep PW *pw1, __isl_keep PW *pw2)
 726 {
 727         if (!pw1 || !pw2)
 728                 return -1;
 729
 730         return isl_dim_equal(pw1->dim, pw2->dim);
 731 }
 732
 733 __isl_give PW *FN(PW,morph)(__isl_take PW *pw, __isl_take isl_morph *morph)
 734 {
 735         int i;
 736
 737         if (!pw || !morph)
 738                 goto error;
 739
 740         isl_assert(pw->dim->ctx, isl_dim_equal(pw->dim, morph->dom->dim),
 741                 goto error);
 742
 743         pw = FN(PW,cow)(pw);
 744         if (!pw)
 745                 goto error;
 746         isl_dim_free(pw->dim);
 747         pw->dim = isl_dim_copy(morph->ran->dim);
 748         if (!pw->dim)
 749                 goto error;
 750
 751         for (i = 0; i < pw->n; ++i) {
 752                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
 753                 if (!pw->p[i].set)
 754                         goto error;
 755                 pw->p[i].FIELD = FN(EL,morph)(pw->p[i].FIELD,
 756                                                 isl_morph_copy(morph));
 757                 if (!pw->p[i].FIELD)
 758                         goto error;
 759         }
 760
 761         isl_morph_free(morph);
 762
 763         return pw;
 764 error:
 765         FN(PW,free)(pw);
 766         isl_morph_free(morph);
 767         return NULL;
 768 }
 769
 770 int FN(PW,foreach_piece)(__isl_keep PW *pw,
 771         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
 772         void *user)
 773 {
 774         int i;
 775
 776         if (!pw)
 777                 return -1;
 778
 779         for (i = 0; i < pw->n; ++i)
 780                 if (fn(isl_set_copy(pw->p[i].set),
 781                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
 782                         return -1;
 783
 784         return 0;
 785 }
 786
 787 static int any_divs(__isl_keep isl_set *set)
 788 {
 789         int i;
 790
 791         if (!set)
 792                 return -1;
 793
 794         for (i = 0; i < set->n; ++i)
 795                 if (set->p[i]->n_div > 0)
 796                         return 1;
 797
 798         return 0;
 799 }
 800
 801 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
 802         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 803                     void *user), void *user)
 804 {
 805         int i;
 806
 807         if (!set || !el)
 808                 goto error;
 809
 810         for (i = 0; i < set->n; ++i) {
 811                 isl_set *lift;
 812                 EL *copy;
 813
 814                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
 815                 lift = isl_set_lift(lift);
 816
 817                 copy = FN(EL,copy)(el);
 818                 copy = FN(EL,lift)(copy, isl_set_get_dim(lift));
 819
 820                 if (fn(lift, copy, user) < 0)
 821                         goto error;
 822         }
 823
 824         isl_set_free(set);
 825         FN(EL,free)(el);
 826
 827         return 0;
 828 error:
 829         isl_set_free(set);
 830         FN(EL,free)(el);
 831         return -1;
 832 }
 833
 834 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
 835         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 836                     void *user), void *user)
 837 {
 838         int i;
 839
 840         if (!pw)
 841                 return -1;
 842
 843         for (i = 0; i < pw->n; ++i) {
 844                 isl_set *set;
 845                 EL *el;
 846
 847                 set = isl_set_copy(pw->p[i].set);
 848                 el = FN(EL,copy)(pw->p[i].FIELD);
 849                 if (!any_divs(set)) {
 850                         if (fn(set, el, user) < 0)
 851                                 return -1;
 852                         continue;
 853                 }
 854                 if (foreach_lifted_subset(set, el, fn, user) < 0)
 855                         return -1;
 856         }
 857
 858         return 0;
 859 }
 860
 861 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
 862         enum isl_dim_type dst_type, unsigned dst_pos,
 863         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 864 {
 865         int i;
 866
 867         pw = FN(PW,cow)(pw);
 868         if (!pw)
 869                 return NULL;
 870
 871         pw->dim = isl_dim_move(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
 872         if (!pw->dim)
 873                 goto error;
 874
 875         for (i = 0; i < pw->n; ++i) {
 876                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
 877                                                 dst_type, dst_pos,
 878                                                 src_type, src_pos, n);
 879                 if (!pw->p[i].set)
 880                         goto error;
 881                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
 882                                         dst_type, dst_pos, src_type, src_pos, n);
 883                 if (!pw->p[i].FIELD)
 884                         goto error;
 885         }
 886
 887         return pw;
 888 error:
 889         FN(PW,free)(pw);
 890         return NULL;
 891 }
 892
 893 __isl_give PW *FN(PW,realign)(__isl_take PW *pw, __isl_take isl_reordering *exp)
 894 {
 895         int i;
 896
 897         pw = FN(PW,cow)(pw);
 898         if (!pw || !exp)
 899                 return NULL;
 900
 901         for (i = 0; i < pw->n; ++i) {
 902                 pw->p[i].set = isl_set_realign(pw->p[i].set,
 903                                                     isl_reordering_copy(exp));
 904                 if (!pw->p[i].set)
 905                         goto error;
 906                 pw->p[i].FIELD = FN(EL,realign)(pw->p[i].FIELD,
 907                                                     isl_reordering_copy(exp));
 908                 if (!pw->p[i].FIELD)
 909                         goto error;
 910         }
 911
 912         pw = FN(PW,reset_dim)(pw, isl_dim_copy(exp->dim));
 913
 914         isl_reordering_free(exp);
 915         return pw;
 916 error:
 917         isl_reordering_free(exp);
 918         FN(PW,free)(pw);
 919         return NULL;
 920 }
 921
 922 __isl_give PW *FN(PW,mul_isl_int)(__isl_take PW *pw, isl_int v)
 923 {
 924         int i;
 925
 926         if (isl_int_is_one(v))
 927                 return pw;
 928         if (pw && isl_int_is_zero(v)) {
 929                 PW *zero;
 930                 isl_dim *dim = FN(PW,get_dim)(pw);
 931 #ifdef HAS_TYPE
 932                 zero = FN(PW,zero)(dim, pw->type);
 933 #else
 934                 zero = FN(PW,zero)(dim);
 935 #endif
 936                 FN(PW,free)(pw);
 937                 return zero;
 938         }
 939         pw = FN(PW,cow)(pw);
 940         if (!pw)
 941                 return NULL;
 942         if (pw->n == 0)
 943                 return pw;
 944
 945 #ifdef HAS_TYPE
 946         if (isl_int_is_neg(v))
 947                 pw->type = isl_fold_type_negate(pw->type);
 948 #endif
 949         for (i = 0; i < pw->n; ++i) {
 950                 pw->p[i].FIELD = FN(EL,mul_isl_int)(pw->p[i].FIELD, v);
 951                 if (!pw->p[i].FIELD)
 952                         goto error;
 953         }
 954
 955         return pw;
 956 error:
 957         FN(PW,free)(pw);
 958         return NULL;
 959 }