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 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_plain_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_plain_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                 pw->p[i].set = isl_set_intersect(pw->p[i].set,
 413                                                  isl_set_copy(context));
 414                 if (!pw->p[i].set)
 415                         goto error;
 416                 pw->p[i].FIELD = FN(EL,gist)(pw->p[i].FIELD,
 417                                              isl_set_copy(pw->p[i].set));
 418                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 419                                                 isl_basic_set_copy(hull));
 420                 if (!pw->p[i].set)
 421                         goto error;
 422                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 423                         isl_set_free(pw->p[i].set);
 424                         FN(EL,free)(pw->p[i].FIELD);
 425                         if (i != pw->n - 1)
 426                                 pw->p[i] = pw->p[pw->n - 1];
 427                         pw->n--;
 428                 }
 429         }
 430
 431         isl_basic_set_free(hull);
 432         isl_set_free(context);
 433
 434         return pw;
 435 error:
 436         FN(PW,free)(pw);
 437         isl_basic_set_free(hull);
 438         isl_set_free(context);
 439         return NULL;
 440 }
 441
 442 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 443 {
 444         int i, j;
 445
 446         if (!pw)
 447                 return NULL;
 448         if (pw->n == 0)
 449                 return pw;
 450
 451         for (i = pw->n - 1; i >= 0; --i) {
 452                 for (j = i - 1; j >= 0; --j) {
 453                         if (!FN(EL,is_equal)(pw->p[i].FIELD, pw->p[j].FIELD))
 454                                 continue;
 455                         pw->p[j].set = isl_set_union(pw->p[j].set,
 456                                                         pw->p[i].set);
 457                         FN(EL,free)(pw->p[i].FIELD);
 458                         if (i != pw->n - 1)
 459                                 pw->p[i] = pw->p[pw->n - 1];
 460                         pw->n--;
 461                         break;
 462                 }
 463                 if (j >= 0)
 464                         continue;
 465                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 466                 if (!pw->p[i].set)
 467                         goto error;
 468         }
 469
 470         return pw;
 471 error:
 472         FN(PW,free)(pw);
 473         return NULL;
 474 }
 475
 476 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 477 {
 478         return pw ? pw->dim->ctx : NULL;
 479 }
 480
 481 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 482         unsigned first, unsigned n)
 483 {
 484         int i;
 485
 486         if (!pw)
 487                 return -1;
 488         if (pw->n == 0 || n == 0)
 489                 return 0;
 490         for (i = 0; i < pw->n; ++i) {
 491                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 492                                                         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 }