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 __isl_give PW *FN(PW,alloc_size)(__isl_take isl_space *dim,
   8         enum isl_fold type, int n)
   9 #else
  10 __isl_give PW *FN(PW,alloc_size)(__isl_take isl_space *dim, int n)
  11 #endif
  12 {
  13         isl_ctx *ctx;
  14         struct PW *pw;
  15
  16         if (!dim)
  17                 return NULL;
  18         ctx = isl_space_get_ctx(dim);
  19         isl_assert(ctx, n >= 0, goto error);
  20         pw = isl_alloc(ctx, struct PW,
  21                         sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
  22         if (!pw)
  23                 goto error;
  24
  25         pw->ref = 1;
  26 #ifdef HAS_TYPE
  27         pw->type = type;
  28 #endif
  29         pw->size = n;
  30         pw->n = 0;
  31         pw->dim = dim;
  32         return pw;
  33 error:
  34         isl_space_free(dim);
  35         return NULL;
  36 }
  37
  38 #ifdef HAS_TYPE
  39 __isl_give PW *FN(PW,ZERO)(__isl_take isl_space *dim, enum isl_fold type)
  40 {
  41         return FN(PW,alloc_size)(dim, type, 0);
  42 }
  43 #else
  44 __isl_give PW *FN(PW,ZERO)(__isl_take isl_space *dim)
  45 {
  46         return FN(PW,alloc_size)(dim, 0);
  47 }
  48 #endif
  49
  50 __isl_give PW *FN(PW,add_piece)(__isl_take PW *pw,
  51         __isl_take isl_set *set, __isl_take EL *el)
  52 {
  53         isl_ctx *ctx;
  54         isl_space *el_dim = NULL;
  55
  56         if (!pw || !set || !el)
  57                 goto error;
  58
  59         if (isl_set_plain_is_empty(set) || FN(EL,EL_IS_ZERO)(el)) {
  60                 isl_set_free(set);
  61                 FN(EL,free)(el);
  62                 return pw;
  63         }
  64
  65         ctx = isl_set_get_ctx(set);
  66 #ifdef HAS_TYPE
  67         if (pw->type != el->type)
  68                 isl_die(ctx, isl_error_invalid, "fold types don't match",
  69                         goto error);
  70 #endif
  71         el_dim = FN(EL,get_space(el));
  72         isl_assert(ctx, isl_space_is_equal(pw->dim, el_dim), goto error);
  73         isl_assert(ctx, pw->n < pw->size, goto error);
  74
  75         pw->p[pw->n].set = set;
  76         pw->p[pw->n].FIELD = el;
  77         pw->n++;
  78
  79         isl_space_free(el_dim);
  80         return pw;
  81 error:
  82         isl_space_free(el_dim);
  83         FN(PW,free)(pw);
  84         isl_set_free(set);
  85         FN(EL,free)(el);
  86         return NULL;
  87 }
  88
  89 #ifdef HAS_TYPE
  90 __isl_give PW *FN(PW,alloc)(enum isl_fold type,
  91         __isl_take isl_set *set, __isl_take EL *el)
  92 #else
  93 __isl_give PW *FN(PW,alloc)(__isl_take isl_set *set, __isl_take EL *el)
  94 #endif
  95 {
  96         PW *pw;
  97
  98         if (!set || !el)
  99                 goto error;
 100
 101 #ifdef HAS_TYPE
 102         pw = FN(PW,alloc_size)(FN(EL,get_space)(el), type, 1);
 103 #else
 104         pw = FN(PW,alloc_size)(FN(EL,get_space)(el), 1);
 105 #endif
 106
 107         return FN(PW,add_piece)(pw, set, el);
 108 error:
 109         isl_set_free(set);
 110         FN(EL,free)(el);
 111         return NULL;
 112 }
 113
 114 __isl_give PW *FN(PW,dup)(__isl_keep PW *pw)
 115 {
 116         int i;
 117         PW *dup;
 118
 119         if (!pw)
 120                 return NULL;
 121
 122 #ifdef HAS_TYPE
 123         dup = FN(PW,alloc_size)(isl_space_copy(pw->dim), pw->type, pw->n);
 124 #else
 125         dup = FN(PW,alloc_size)(isl_space_copy(pw->dim), pw->n);
 126 #endif
 127         if (!dup)
 128                 return NULL;
 129
 130         for (i = 0; i < pw->n; ++i)
 131                 dup = FN(PW,add_piece)(dup, isl_set_copy(pw->p[i].set),
 132                                             FN(EL,copy)(pw->p[i].FIELD));
 133
 134         return dup;
 135 }
 136
 137 __isl_give PW *FN(PW,cow)(__isl_take PW *pw)
 138 {
 139         if (!pw)
 140                 return NULL;
 141
 142         if (pw->ref == 1)
 143                 return pw;
 144         pw->ref--;
 145         return FN(PW,dup)(pw);
 146 }
 147
 148 __isl_give PW *FN(PW,copy)(__isl_keep PW *pw)
 149 {
 150         if (!pw)
 151                 return NULL;
 152
 153         pw->ref++;
 154         return pw;
 155 }
 156
 157 void *FN(PW,free)(__isl_take PW *pw)
 158 {
 159         int i;
 160
 161         if (!pw)
 162                 return NULL;
 163         if (--pw->ref > 0)
 164                 return NULL;
 165
 166         for (i = 0; i < pw->n; ++i) {
 167                 isl_set_free(pw->p[i].set);
 168                 FN(EL,free)(pw->p[i].FIELD);
 169         }
 170         isl_space_free(pw->dim);
 171         free(pw);
 172
 173         return NULL;
 174 }
 175
 176 const char *FN(PW,get_dim_name)(__isl_keep PW *pw, enum isl_dim_type type,
 177         unsigned pos)
 178 {
 179         return pw ? isl_space_get_dim_name(pw->dim, type, pos) : NULL;
 180 }
 181
 182 int FN(PW,has_dim_id)(__isl_keep PW *pw, enum isl_dim_type type, unsigned pos)
 183 {
 184         return pw ? isl_space_has_dim_id(pw->dim, type, pos) : -1;
 185 }
 186
 187 __isl_give isl_id *FN(PW,get_dim_id)(__isl_keep PW *pw, enum isl_dim_type type,
 188         unsigned pos)
 189 {
 190         return pw ? isl_space_get_dim_id(pw->dim, type, pos) : NULL;
 191 }
 192
 193 int FN(PW,has_tuple_name)(__isl_keep PW *pw, enum isl_dim_type type)
 194 {
 195         return pw ? isl_space_has_tuple_name(pw->dim, type) : -1;
 196 }
 197
 198 const char *FN(PW,get_tuple_name)(__isl_keep PW *pw, enum isl_dim_type type)
 199 {
 200         return pw ? isl_space_get_tuple_name(pw->dim, type) : NULL;
 201 }
 202
 203 int FN(PW,has_tuple_id)(__isl_keep PW *pw, enum isl_dim_type type)
 204 {
 205         return pw ? isl_space_has_tuple_id(pw->dim, type) : -1;
 206 }
 207
 208 __isl_give isl_id *FN(PW,get_tuple_id)(__isl_keep PW *pw, enum isl_dim_type type)
 209 {
 210         return pw ? isl_space_get_tuple_id(pw->dim, type) : NULL;
 211 }
 212
 213 int FN(PW,IS_ZERO)(__isl_keep PW *pw)
 214 {
 215         if (!pw)
 216                 return -1;
 217
 218         return pw->n == 0;
 219 }
 220
 221 #ifndef NO_REALIGN
 222 __isl_give PW *FN(PW,realign_domain)(__isl_take PW *pw,
 223         __isl_take isl_reordering *exp)
 224 {
 225         int i;
 226
 227         pw = FN(PW,cow)(pw);
 228         if (!pw || !exp)
 229                 goto error;
 230
 231         for (i = 0; i < pw->n; ++i) {
 232                 pw->p[i].set = isl_set_realign(pw->p[i].set,
 233                                                     isl_reordering_copy(exp));
 234                 if (!pw->p[i].set)
 235                         goto error;
 236                 pw->p[i].FIELD = FN(EL,realign_domain)(pw->p[i].FIELD,
 237                                                     isl_reordering_copy(exp));
 238                 if (!pw->p[i].FIELD)
 239                         goto error;
 240         }
 241
 242         pw = FN(PW,reset_domain_space)(pw, isl_space_copy(exp->dim));
 243
 244         isl_reordering_free(exp);
 245         return pw;
 246 error:
 247         isl_reordering_free(exp);
 248         FN(PW,free)(pw);
 249         return NULL;
 250 }
 251
 252 /* Align the parameters of "pw" to those of "model".
 253  */
 254 __isl_give PW *FN(PW,align_params)(__isl_take PW *pw, __isl_take isl_space *model)
 255 {
 256         isl_ctx *ctx;
 257
 258         if (!pw || !model)
 259                 goto error;
 260
 261         ctx = isl_space_get_ctx(model);
 262         if (!isl_space_has_named_params(model))
 263                 isl_die(ctx, isl_error_invalid,
 264                         "model has unnamed parameters", goto error);
 265         if (!isl_space_has_named_params(pw->dim))
 266                 isl_die(ctx, isl_error_invalid,
 267                         "input has unnamed parameters", goto error);
 268         if (!isl_space_match(pw->dim, isl_dim_param, model, isl_dim_param)) {
 269                 isl_reordering *exp;
 270
 271                 model = isl_space_drop_dims(model, isl_dim_in,
 272                                         0, isl_space_dim(model, isl_dim_in));
 273                 model = isl_space_drop_dims(model, isl_dim_out,
 274                                         0, isl_space_dim(model, isl_dim_out));
 275                 exp = isl_parameter_alignment_reordering(pw->dim, model);
 276                 exp = isl_reordering_extend_space(exp,
 277                                         FN(PW,get_domain_space)(pw));
 278                 pw = FN(PW,realign_domain)(pw, exp);
 279         }
 280
 281         isl_space_free(model);
 282         return pw;
 283 error:
 284         isl_space_free(model);
 285         FN(PW,free)(pw);
 286         return NULL;
 287 }
 288
 289 static __isl_give PW *FN(PW,align_params_pw_pw_and)(__isl_take PW *pw1,
 290         __isl_take PW *pw2,
 291         __isl_give PW *(*fn)(__isl_take PW *pw1, __isl_take PW *pw2))
 292 {
 293         isl_ctx *ctx;
 294
 295         if (!pw1 || !pw2)
 296                 goto error;
 297         if (isl_space_match(pw1->dim, isl_dim_param, pw2->dim, isl_dim_param))
 298                 return fn(pw1, pw2);
 299         ctx = FN(PW,get_ctx)(pw1);
 300         if (!isl_space_has_named_params(pw1->dim) ||
 301             !isl_space_has_named_params(pw2->dim))
 302                 isl_die(ctx, isl_error_invalid,
 303                         "unaligned unnamed parameters", goto error);
 304         pw1 = FN(PW,align_params)(pw1, FN(PW,get_space)(pw2));
 305         pw2 = FN(PW,align_params)(pw2, FN(PW,get_space)(pw1));
 306         return fn(pw1, pw2);
 307 error:
 308         FN(PW,free)(pw1);
 309         FN(PW,free)(pw2);
 310         return NULL;
 311 }
 312
 313 static __isl_give PW *FN(PW,align_params_pw_set_and)(__isl_take PW *pw,
 314         __isl_take isl_set *set,
 315         __isl_give PW *(*fn)(__isl_take PW *pw, __isl_take isl_set *set))
 316 {
 317         isl_ctx *ctx;
 318
 319         if (!pw || !set)
 320                 goto error;
 321         if (isl_space_match(pw->dim, isl_dim_param, set->dim, isl_dim_param))
 322                 return fn(pw, set);
 323         ctx = FN(PW,get_ctx)(pw);
 324         if (!isl_space_has_named_params(pw->dim) ||
 325             !isl_space_has_named_params(set->dim))
 326                 isl_die(ctx, isl_error_invalid,
 327                         "unaligned unnamed parameters", goto error);
 328         pw = FN(PW,align_params)(pw, isl_set_get_space(set));
 329         set = isl_set_align_params(set, FN(PW,get_space)(pw));
 330         return fn(pw, set);
 331 error:
 332         FN(PW,free)(pw);
 333         isl_set_free(set);
 334         return NULL;
 335 }
 336 #endif
 337
 338 static __isl_give PW *FN(PW,union_add_aligned)(__isl_take PW *pw1,
 339         __isl_take PW *pw2)
 340 {
 341         int i, j, n;
 342         struct PW *res;
 343         isl_ctx *ctx;
 344         isl_set *set;
 345
 346         if (!pw1 || !pw2)
 347                 goto error;
 348
 349         ctx = isl_space_get_ctx(pw1->dim);
 350 #ifdef HAS_TYPE
 351         if (pw1->type != pw2->type)
 352                 isl_die(ctx, isl_error_invalid,
 353                         "fold types don't match", goto error);
 354 #endif
 355         isl_assert(ctx, isl_space_is_equal(pw1->dim, pw2->dim), goto error);
 356
 357         if (FN(PW,IS_ZERO)(pw1)) {
 358                 FN(PW,free)(pw1);
 359                 return pw2;
 360         }
 361
 362         if (FN(PW,IS_ZERO)(pw2)) {
 363                 FN(PW,free)(pw2);
 364                 return pw1;
 365         }
 366
 367         n = (pw1->n + 1) * (pw2->n + 1);
 368 #ifdef HAS_TYPE
 369         res = FN(PW,alloc_size)(isl_space_copy(pw1->dim), pw1->type, n);
 370 #else
 371         res = FN(PW,alloc_size)(isl_space_copy(pw1->dim), n);
 372 #endif
 373
 374         for (i = 0; i < pw1->n; ++i) {
 375                 set = isl_set_copy(pw1->p[i].set);
 376                 for (j = 0; j < pw2->n; ++j) {
 377                         struct isl_set *common;
 378                         EL *sum;
 379                         common = isl_set_intersect(isl_set_copy(pw1->p[i].set),
 380                                                 isl_set_copy(pw2->p[j].set));
 381                         if (isl_set_plain_is_empty(common)) {
 382                                 isl_set_free(common);
 383                                 continue;
 384                         }
 385                         set = isl_set_subtract(set,
 386                                         isl_set_copy(pw2->p[j].set));
 387
 388                         sum = FN(EL,add_on_domain)(common,
 389                                                    FN(EL,copy)(pw1->p[i].FIELD),
 390                                                    FN(EL,copy)(pw2->p[j].FIELD));
 391
 392                         res = FN(PW,add_piece)(res, common, sum);
 393                 }
 394                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw1->p[i].FIELD));
 395         }
 396
 397         for (j = 0; j < pw2->n; ++j) {
 398                 set = isl_set_copy(pw2->p[j].set);
 399                 for (i = 0; i < pw1->n; ++i)
 400                         set = isl_set_subtract(set,
 401                                         isl_set_copy(pw1->p[i].set));
 402                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw2->p[j].FIELD));
 403         }
 404
 405         FN(PW,free)(pw1);
 406         FN(PW,free)(pw2);
 407
 408         return res;
 409 error:
 410         FN(PW,free)(pw1);
 411         FN(PW,free)(pw2);
 412         return NULL;
 413 }
 414
 415 /* Private version of "union_add".  For isl_pw_qpolynomial and
 416  * isl_pw_qpolynomial_fold, we prefer to simply call it "add".
 417  */
 418 static __isl_give PW *FN(PW,union_add_)(__isl_take PW *pw1, __isl_take PW *pw2)
 419 {
 420         return FN(PW,align_params_pw_pw_and)(pw1, pw2,
 421                                                 &FN(PW,union_add_aligned));
 422 }
 423
 424 /* Make sure "pw" has room for at least "n" more pieces.
 425  *
 426  * If there is only one reference to pw, we extend it in place.
 427  * Otherwise, we create a new PW and copy the pieces.
 428  */
 429 static __isl_give PW *FN(PW,grow)(__isl_take PW *pw, int n)
 430 {
 431         int i;
 432         isl_ctx *ctx;
 433         PW *res;
 434
 435         if (!pw)
 436                 return NULL;
 437         if (pw->n + n <= pw->size)
 438                 return pw;
 439         ctx = FN(PW,get_ctx)(pw);
 440         n += pw->n;
 441         if (pw->ref == 1) {
 442                 res = isl_realloc(ctx, pw, struct PW,
 443                             sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
 444                 if (!res)
 445                         return FN(PW,free)(pw);
 446                 res->size = n;
 447                 return res;
 448         }
 449 #ifdef HAS_TYPE
 450         res = FN(PW,alloc_size)(isl_space_copy(pw->dim), pw->type, n);
 451 #else
 452         res = FN(PW,alloc_size)(isl_space_copy(pw->dim), n);
 453 #endif
 454         if (!res)
 455                 return FN(PW,free)(pw);
 456         for (i = 0; i < pw->n; ++i)
 457                 res = FN(PW,add_piece)(res, isl_set_copy(pw->p[i].set),
 458                                             FN(EL,copy)(pw->p[i].FIELD));
 459         FN(PW,free)(pw);
 460         return res;
 461 }
 462
 463 static __isl_give PW *FN(PW,add_disjoint_aligned)(__isl_take PW *pw1,
 464         __isl_take PW *pw2)
 465 {
 466         int i;
 467         isl_ctx *ctx;
 468
 469         if (!pw1 || !pw2)
 470                 goto error;
 471
 472         if (pw1->size < pw1->n + pw2->n && pw1->n < pw2->n)
 473                 return FN(PW,add_disjoint_aligned)(pw2, pw1);
 474
 475         ctx = isl_space_get_ctx(pw1->dim);
 476 #ifdef HAS_TYPE
 477         if (pw1->type != pw2->type)
 478                 isl_die(ctx, isl_error_invalid,
 479                         "fold types don't match", goto error);
 480 #endif
 481         isl_assert(ctx, isl_space_is_equal(pw1->dim, pw2->dim), goto error);
 482
 483         if (FN(PW,IS_ZERO)(pw1)) {
 484                 FN(PW,free)(pw1);
 485                 return pw2;
 486         }
 487
 488         if (FN(PW,IS_ZERO)(pw2)) {
 489                 FN(PW,free)(pw2);
 490                 return pw1;
 491         }
 492
 493         pw1 = FN(PW,grow)(pw1, pw2->n);
 494         if (!pw1)
 495                 goto error;
 496
 497         for (i = 0; i < pw2->n; ++i)
 498                 pw1 = FN(PW,add_piece)(pw1,
 499                                 isl_set_copy(pw2->p[i].set),
 500                                 FN(EL,copy)(pw2->p[i].FIELD));
 501
 502         FN(PW,free)(pw2);
 503
 504         return pw1;
 505 error:
 506         FN(PW,free)(pw1);
 507         FN(PW,free)(pw2);
 508         return NULL;
 509 }
 510
 511 __isl_give PW *FN(PW,add_disjoint)(__isl_take PW *pw1, __isl_take PW *pw2)
 512 {
 513         return FN(PW,align_params_pw_pw_and)(pw1, pw2,
 514                                                 &FN(PW,add_disjoint_aligned));
 515 }
 516
 517 /* This function is currently only used from isl_aff.c
 518  */
 519 static __isl_give PW *FN(PW,on_shared_domain_in)(__isl_take PW *pw1,
 520         __isl_take PW *pw2, __isl_take isl_space *space,
 521         __isl_give EL *(*fn)(__isl_take EL *el1, __isl_take EL *el2))
 522         __attribute__ ((unused));
 523
 524 /* Apply "fn" to pairs of elements from pw1 and pw2 on shared domains.
 525  * The result of "fn" (and therefore also of this function) lives in "space".
 526  */
 527 static __isl_give PW *FN(PW,on_shared_domain_in)(__isl_take PW *pw1,
 528         __isl_take PW *pw2, __isl_take isl_space *space,
 529         __isl_give EL *(*fn)(__isl_take EL *el1, __isl_take EL *el2))
 530 {
 531         int i, j, n;
 532         PW *res = NULL;
 533
 534         if (!pw1 || !pw2)
 535                 goto error;
 536
 537         n = pw1->n * pw2->n;
 538 #ifdef HAS_TYPE
 539         res = FN(PW,alloc_size)(space, pw1->type, n);
 540 #else
 541         res = FN(PW,alloc_size)(space, n);
 542 #endif
 543
 544         for (i = 0; i < pw1->n; ++i) {
 545                 for (j = 0; j < pw2->n; ++j) {
 546                         isl_set *common;
 547                         EL *res_ij;
 548                         int empty;
 549
 550                         common = isl_set_intersect(
 551                                         isl_set_copy(pw1->p[i].set),
 552                                         isl_set_copy(pw2->p[j].set));
 553                         empty = isl_set_plain_is_empty(common);
 554                         if (empty < 0 || empty) {
 555                                 isl_set_free(common);
 556                                 if (empty < 0)
 557                                         goto error;
 558                                 continue;
 559                         }
 560
 561                         res_ij = fn(FN(EL,copy)(pw1->p[i].FIELD),
 562                                     FN(EL,copy)(pw2->p[j].FIELD));
 563                         res_ij = FN(EL,gist)(res_ij, isl_set_copy(common));
 564
 565                         res = FN(PW,add_piece)(res, common, res_ij);
 566                 }
 567         }
 568
 569         FN(PW,free)(pw1);
 570         FN(PW,free)(pw2);
 571         return res;
 572 error:
 573         isl_space_free(space);
 574         FN(PW,free)(pw1);
 575         FN(PW,free)(pw2);
 576         FN(PW,free)(res);
 577         return NULL;
 578 }
 579
 580 /* This function is currently only used from isl_aff.c
 581  */
 582 static __isl_give PW *FN(PW,on_shared_domain)(__isl_take PW *pw1,
 583         __isl_take PW *pw2,
 584         __isl_give EL *(*fn)(__isl_take EL *el1, __isl_take EL *el2))
 585         __attribute__ ((unused));
 586
 587 /* Apply "fn" to pairs of elements from pw1 and pw2 on shared domains.
 588  * The result of "fn" is assumed to live in the same space as "pw1" and "pw2".
 589  */
 590 static __isl_give PW *FN(PW,on_shared_domain)(__isl_take PW *pw1,
 591         __isl_take PW *pw2,
 592         __isl_give EL *(*fn)(__isl_take EL *el1, __isl_take EL *el2))
 593 {
 594         isl_space *space;
 595
 596         if (!pw1 || !pw2)
 597                 goto error;
 598
 599         space = isl_space_copy(pw1->dim);
 600         return FN(PW,on_shared_domain_in)(pw1, pw2, space, fn);
 601 error:
 602         FN(PW,free)(pw1);
 603         FN(PW,free)(pw2);
 604         return NULL;
 605 }
 606
 607 #ifndef NO_NEG
 608 __isl_give PW *FN(PW,neg)(__isl_take PW *pw)
 609 {
 610         int i;
 611
 612         if (!pw)
 613                 return NULL;
 614
 615         if (FN(PW,IS_ZERO)(pw))
 616                 return pw;
 617
 618         pw = FN(PW,cow)(pw);
 619         if (!pw)
 620                 return NULL;
 621
 622         for (i = 0; i < pw->n; ++i) {
 623                 pw->p[i].FIELD = FN(EL,neg)(pw->p[i].FIELD);
 624                 if (!pw->p[i].FIELD)
 625                         return FN(PW,free)(pw);
 626         }
 627
 628         return pw;
 629 }
 630
 631 __isl_give PW *FN(PW,sub)(__isl_take PW *pw1, __isl_take PW *pw2)
 632 {
 633         return FN(PW,add)(pw1, FN(PW,neg)(pw2));
 634 }
 635 #endif
 636
 637 #ifndef NO_EVAL
 638 __isl_give isl_qpolynomial *FN(PW,eval)(__isl_take PW *pw,
 639         __isl_take isl_point *pnt)
 640 {
 641         int i;
 642         int found = 0;
 643         isl_ctx *ctx;
 644         isl_space *pnt_dim = NULL;
 645         isl_qpolynomial *qp;
 646
 647         if (!pw || !pnt)
 648                 goto error;
 649         ctx = isl_point_get_ctx(pnt);
 650         pnt_dim = isl_point_get_space(pnt);
 651         isl_assert(ctx, isl_space_is_domain(pnt_dim, pw->dim), goto error);
 652
 653         for (i = 0; i < pw->n; ++i) {
 654                 found = isl_set_contains_point(pw->p[i].set, pnt);
 655                 if (found < 0)
 656                         goto error;
 657                 if (found)
 658                         break;
 659         }
 660         if (found)
 661                 qp = FN(EL,eval)(FN(EL,copy)(pw->p[i].FIELD),
 662                                             isl_point_copy(pnt));
 663         else
 664                 qp = isl_qpolynomial_zero_on_domain(FN(PW,get_domain_space)(pw));
 665         FN(PW,free)(pw);
 666         isl_space_free(pnt_dim);
 667         isl_point_free(pnt);
 668         return qp;
 669 error:
 670         FN(PW,free)(pw);
 671         isl_space_free(pnt_dim);
 672         isl_point_free(pnt);
 673         return NULL;
 674 }
 675 #endif
 676
 677 __isl_give isl_set *FN(PW,domain)(__isl_take PW *pw)
 678 {
 679         int i;
 680         isl_set *dom;
 681
 682         if (!pw)
 683                 return NULL;
 684
 685         dom = isl_set_empty(FN(PW,get_domain_space)(pw));
 686         for (i = 0; i < pw->n; ++i)
 687                 dom = isl_set_union_disjoint(dom, isl_set_copy(pw->p[i].set));
 688
 689         FN(PW,free)(pw);
 690
 691         return dom;
 692 }
 693
 694 /* Restrict the domain of "pw" by combining each cell
 695  * with "set" through a call to "fn", where "fn" may be
 696  * isl_set_intersect or isl_set_intersect_params.
 697  */
 698 static __isl_give PW *FN(PW,intersect_aligned)(__isl_take PW *pw,
 699         __isl_take isl_set *set,
 700         __isl_give isl_set *(*fn)(__isl_take isl_set *set1,
 701                                     __isl_take isl_set *set2))
 702 {
 703         int i;
 704
 705         if (!pw || !set)
 706                 goto error;
 707
 708         if (pw->n == 0) {
 709                 isl_set_free(set);
 710                 return pw;
 711         }
 712
 713         pw = FN(PW,cow)(pw);
 714         if (!pw)
 715                 goto error;
 716
 717         for (i = pw->n - 1; i >= 0; --i) {
 718                 isl_basic_set *aff;
 719                 pw->p[i].set = fn(pw->p[i].set, isl_set_copy(set));
 720                 if (!pw->p[i].set)
 721                         goto error;
 722                 aff = isl_set_affine_hull(isl_set_copy(pw->p[i].set));
 723                 pw->p[i].FIELD = FN(EL,substitute_equalities)(pw->p[i].FIELD,
 724                                                                 aff);
 725                 if (!pw->p[i].FIELD)
 726                         goto error;
 727                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 728                         isl_set_free(pw->p[i].set);
 729                         FN(EL,free)(pw->p[i].FIELD);
 730                         if (i != pw->n - 1)
 731                                 pw->p[i] = pw->p[pw->n - 1];
 732                         pw->n--;
 733                 }
 734         }
 735
 736         isl_set_free(set);
 737         return pw;
 738 error:
 739         isl_set_free(set);
 740         FN(PW,free)(pw);
 741         return NULL;
 742 }
 743
 744 static __isl_give PW *FN(PW,intersect_domain_aligned)(__isl_take PW *pw,
 745         __isl_take isl_set *set)
 746 {
 747         return FN(PW,intersect_aligned)(pw, set, &isl_set_intersect);
 748 }
 749
 750 __isl_give PW *FN(PW,intersect_domain)(__isl_take PW *pw,
 751         __isl_take isl_set *context)
 752 {
 753         return FN(PW,align_params_pw_set_and)(pw, context,
 754                                         &FN(PW,intersect_domain_aligned));
 755 }
 756
 757 static __isl_give PW *FN(PW,intersect_params_aligned)(__isl_take PW *pw,
 758         __isl_take isl_set *set)
 759 {
 760         return FN(PW,intersect_aligned)(pw, set, &isl_set_intersect_params);
 761 }
 762
 763 /* Intersect the domain of "pw" with the parameter domain "context".
 764  */
 765 __isl_give PW *FN(PW,intersect_params)(__isl_take PW *pw,
 766         __isl_take isl_set *context)
 767 {
 768         return FN(PW,align_params_pw_set_and)(pw, context,
 769                                         &FN(PW,intersect_params_aligned));
 770 }
 771
 772 static __isl_give PW *FN(PW,gist_aligned)(__isl_take PW *pw,
 773         __isl_take isl_set *context,
 774         __isl_give EL *(*fn_el)(__isl_take EL *el,
 775                                     __isl_take isl_set *set),
 776         __isl_give isl_set *(*fn_dom)(__isl_take isl_set *set,
 777                                     __isl_take isl_basic_set *bset))
 778 {
 779         int i;
 780         isl_basic_set *hull = NULL;
 781
 782         if (!pw || !context)
 783                 goto error;
 784
 785         if (pw->n == 0) {
 786                 isl_set_free(context);
 787                 return pw;
 788         }
 789
 790         if (!isl_space_match(pw->dim, isl_dim_param,
 791                                 context->dim, isl_dim_param)) {
 792                 pw = FN(PW,align_params)(pw, isl_set_get_space(context));
 793                 context = isl_set_align_params(context, FN(PW,get_space)(pw));
 794         }
 795
 796         context = isl_set_compute_divs(context);
 797         hull = isl_set_simple_hull(isl_set_copy(context));
 798
 799         pw = FN(PW,cow)(pw);
 800         if (!pw)
 801                 goto error;
 802
 803         for (i = pw->n - 1; i >= 0; --i) {
 804                 pw->p[i].set = isl_set_intersect(pw->p[i].set,
 805                                                  isl_set_copy(context));
 806                 if (!pw->p[i].set)
 807                         goto error;
 808                 pw->p[i].FIELD = fn_el(pw->p[i].FIELD,
 809                                              isl_set_copy(pw->p[i].set));
 810                 pw->p[i].set = fn_dom(pw->p[i].set, isl_basic_set_copy(hull));
 811                 if (!pw->p[i].set)
 812                         goto error;
 813                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 814                         isl_set_free(pw->p[i].set);
 815                         FN(EL,free)(pw->p[i].FIELD);
 816                         if (i != pw->n - 1)
 817                                 pw->p[i] = pw->p[pw->n - 1];
 818                         pw->n--;
 819                 }
 820         }
 821
 822         isl_basic_set_free(hull);
 823         isl_set_free(context);
 824
 825         return pw;
 826 error:
 827         FN(PW,free)(pw);
 828         isl_basic_set_free(hull);
 829         isl_set_free(context);
 830         return NULL;
 831 }
 832
 833 static __isl_give PW *FN(PW,gist_domain_aligned)(__isl_take PW *pw,
 834         __isl_take isl_set *set)
 835 {
 836         return FN(PW,gist_aligned)(pw, set, &FN(EL,gist),
 837                                         &isl_set_gist_basic_set);
 838 }
 839
 840 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
 841 {
 842         return FN(PW,align_params_pw_set_and)(pw, context,
 843                                                 &FN(PW,gist_domain_aligned));
 844 }
 845
 846 static __isl_give PW *FN(PW,gist_params_aligned)(__isl_take PW *pw,
 847         __isl_take isl_set *set)
 848 {
 849         return FN(PW,gist_aligned)(pw, set, &FN(EL,gist_params),
 850                                         &isl_set_gist_params_basic_set);
 851 }
 852
 853 __isl_give PW *FN(PW,gist_params)(__isl_take PW *pw,
 854         __isl_take isl_set *context)
 855 {
 856         return FN(PW,align_params_pw_set_and)(pw, context,
 857                                                 &FN(PW,gist_params_aligned));
 858 }
 859
 860 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 861 {
 862         int i, j;
 863
 864         if (!pw)
 865                 return NULL;
 866         if (pw->n == 0)
 867                 return pw;
 868
 869         for (i = pw->n - 1; i >= 0; --i) {
 870                 for (j = i - 1; j >= 0; --j) {
 871                         if (!FN(EL,plain_is_equal)(pw->p[i].FIELD,
 872                                                         pw->p[j].FIELD))
 873                                 continue;
 874                         pw->p[j].set = isl_set_union(pw->p[j].set,
 875                                                         pw->p[i].set);
 876                         FN(EL,free)(pw->p[i].FIELD);
 877                         if (i != pw->n - 1)
 878                                 pw->p[i] = pw->p[pw->n - 1];
 879                         pw->n--;
 880                         break;
 881                 }
 882                 if (j >= 0)
 883                         continue;
 884                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 885                 if (!pw->p[i].set)
 886                         goto error;
 887         }
 888
 889         return pw;
 890 error:
 891         FN(PW,free)(pw);
 892         return NULL;
 893 }
 894
 895 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 896 {
 897         return pw ? isl_space_get_ctx(pw->dim) : NULL;
 898 }
 899
 900 #ifndef NO_INVOLVES_DIMS
 901 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 902         unsigned first, unsigned n)
 903 {
 904         int i;
 905         enum isl_dim_type set_type;
 906
 907         if (!pw)
 908                 return -1;
 909         if (pw->n == 0 || n == 0)
 910                 return 0;
 911
 912         set_type = type == isl_dim_in ? isl_dim_set : type;
 913
 914         for (i = 0; i < pw->n; ++i) {
 915                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 916                                                         type, first, n);
 917                 if (involves < 0 || involves)
 918                         return involves;
 919                 involves = isl_set_involves_dims(pw->p[i].set,
 920                                                         set_type, first, n);
 921                 if (involves < 0 || involves)
 922                         return involves;
 923         }
 924         return 0;
 925 }
 926 #endif
 927
 928 __isl_give PW *FN(PW,set_dim_name)(__isl_take PW *pw,
 929         enum isl_dim_type type, unsigned pos, const char *s)
 930 {
 931         int i;
 932         enum isl_dim_type set_type;
 933
 934         pw = FN(PW,cow)(pw);
 935         if (!pw)
 936                 return NULL;
 937
 938         set_type = type == isl_dim_in ? isl_dim_set : type;
 939
 940         pw->dim = isl_space_set_dim_name(pw->dim, type, pos, s);
 941         if (!pw->dim)
 942                 goto error;
 943
 944         for (i = 0; i < pw->n; ++i) {
 945                 pw->p[i].set = isl_set_set_dim_name(pw->p[i].set,
 946                                                         set_type, pos, s);
 947                 if (!pw->p[i].set)
 948                         goto error;
 949                 pw->p[i].FIELD = FN(EL,set_dim_name)(pw->p[i].FIELD, type, pos, s);
 950                 if (!pw->p[i].FIELD)
 951                         goto error;
 952         }
 953
 954         return pw;
 955 error:
 956         FN(PW,free)(pw);
 957         return NULL;
 958 }
 959
 960 #ifndef NO_DROP_DIMS
 961 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 962         enum isl_dim_type type, unsigned first, unsigned n)
 963 {
 964         int i;
 965         enum isl_dim_type set_type;
 966
 967         if (!pw)
 968                 return NULL;
 969         if (n == 0 && !isl_space_get_tuple_name(pw->dim, type))
 970                 return pw;
 971
 972         set_type = type == isl_dim_in ? isl_dim_set : type;
 973
 974         pw = FN(PW,cow)(pw);
 975         if (!pw)
 976                 return NULL;
 977         pw->dim = isl_space_drop_dims(pw->dim, type, first, n);
 978         if (!pw->dim)
 979                 goto error;
 980         for (i = 0; i < pw->n; ++i) {
 981                 pw->p[i].set = isl_set_drop(pw->p[i].set, set_type, first, n);
 982                 if (!pw->p[i].set)
 983                         goto error;
 984                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 985                 if (!pw->p[i].FIELD)
 986                         goto error;
 987         }
 988
 989         return pw;
 990 error:
 991         FN(PW,free)(pw);
 992         return NULL;
 993 }
 994
 995 /* This function is very similar to drop_dims.
 996  * The only difference is that the cells may still involve
 997  * the specified dimensions.  They are removed using
 998  * isl_set_project_out instead of isl_set_drop.
 999  */
1000 __isl_give PW *FN(PW,project_out)(__isl_take PW *pw,
1001         enum isl_dim_type type, unsigned first, unsigned n)
1002 {
1003         int i;
1004         enum isl_dim_type set_type;
1005
1006         if (!pw)
1007                 return NULL;
1008         if (n == 0 && !isl_space_get_tuple_name(pw->dim, type))
1009                 return pw;
1010
1011         set_type = type == isl_dim_in ? isl_dim_set : type;
1012
1013         pw = FN(PW,cow)(pw);
1014         if (!pw)
1015                 return NULL;
1016         pw->dim = isl_space_drop_dims(pw->dim, type, first, n);
1017         if (!pw->dim)
1018                 goto error;
1019         for (i = 0; i < pw->n; ++i) {
1020                 pw->p[i].set = isl_set_project_out(pw->p[i].set,
1021                                                         set_type, first, n);
1022                 if (!pw->p[i].set)
1023                         goto error;
1024                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
1025                 if (!pw->p[i].FIELD)
1026                         goto error;
1027         }
1028
1029         return pw;
1030 error:
1031         FN(PW,free)(pw);
1032         return NULL;
1033 }
1034
1035 /* Project the domain of pw onto its parameter space.
1036  */
1037 __isl_give PW *FN(PW,project_domain_on_params)(__isl_take PW *pw)
1038 {
1039         isl_space *space;
1040         unsigned n;
1041
1042         n = FN(PW,dim)(pw, isl_dim_in);
1043         pw = FN(PW,project_out)(pw, isl_dim_in, 0, n);
1044         space = FN(PW,get_domain_space)(pw);
1045         space = isl_space_params(space);
1046         pw = FN(PW,reset_domain_space)(pw, space);
1047         return pw;
1048 }
1049 #endif
1050
1051 #ifndef NO_INSERT_DIMS
1052 __isl_give PW *FN(PW,insert_dims)(__isl_take PW *pw, enum isl_dim_type type,
1053         unsigned first, unsigned n)
1054 {
1055         int i;
1056         enum isl_dim_type set_type;
1057
1058         if (!pw)
1059                 return NULL;
1060         if (n == 0 && !isl_space_is_named_or_nested(pw->dim, type))
1061                 return pw;
1062
1063         set_type = type == isl_dim_in ? isl_dim_set : type;
1064
1065         pw = FN(PW,cow)(pw);
1066         if (!pw)
1067                 return NULL;
1068
1069         pw->dim = isl_space_insert_dims(pw->dim, type, first, n);
1070         if (!pw->dim)
1071                 goto error;
1072
1073         for (i = 0; i < pw->n; ++i) {
1074                 pw->p[i].set = isl_set_insert_dims(pw->p[i].set,
1075                                                             set_type, first, n);
1076                 if (!pw->p[i].set)
1077                         goto error;
1078                 pw->p[i].FIELD = FN(EL,insert_dims)(pw->p[i].FIELD,
1079                                                                 type, first, n);
1080                 if (!pw->p[i].FIELD)
1081                         goto error;
1082         }
1083
1084         return pw;
1085 error:
1086         FN(PW,free)(pw);
1087         return NULL;
1088 }
1089 #endif
1090
1091 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
1092         enum isl_dim_type type, unsigned pos, isl_int v)
1093 {
1094         int i;
1095
1096         if (!pw)
1097                 return NULL;
1098
1099         if (type == isl_dim_in)
1100                 type = isl_dim_set;
1101
1102         pw = FN(PW,cow)(pw);
1103         if (!pw)
1104                 return NULL;
1105         for (i = 0; i < pw->n; ++i) {
1106                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
1107                 if (!pw->p[i].set)
1108                         goto error;
1109         }
1110
1111         return pw;
1112 error:
1113         FN(PW,free)(pw);
1114         return NULL;
1115 }
1116
1117 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
1118 {
1119         return pw ? isl_space_dim(pw->dim, type) : 0;
1120 }
1121
1122 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
1123         enum isl_dim_type type, unsigned first, unsigned n)
1124 {
1125         int i;
1126
1127         if (!pw)
1128                 return NULL;
1129         if (n == 0)
1130                 return pw;
1131
1132         if (type == isl_dim_in)
1133                 type = isl_dim_set;
1134
1135         pw = FN(PW,cow)(pw);
1136         if (!pw)
1137                 return NULL;
1138         if (!pw->dim)
1139                 goto error;
1140         for (i = 0; i < pw->n; ++i) {
1141                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
1142                 if (!pw->p[i].set)
1143                         goto error;
1144         }
1145
1146         return pw;
1147 error:
1148         FN(PW,free)(pw);
1149         return NULL;
1150 }
1151
1152 #ifndef NO_OPT
1153 /* Compute the maximal value attained by the piecewise quasipolynomial
1154  * on its domain or zero if the domain is empty.
1155  * In the worst case, the domain is scanned completely,
1156  * so the domain is assumed to be bounded.
1157  */
1158 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
1159 {
1160         int i;
1161         isl_qpolynomial *opt;
1162
1163         if (!pw)
1164                 return NULL;
1165
1166         if (pw->n == 0) {
1167                 isl_space *dim = isl_space_copy(pw->dim);
1168                 FN(PW,free)(pw);
1169                 return isl_qpolynomial_zero_on_domain(isl_space_domain(dim));
1170         }
1171
1172         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
1173                                         isl_set_copy(pw->p[0].set), max);
1174         for (i = 1; i < pw->n; ++i) {
1175                 isl_qpolynomial *opt_i;
1176                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
1177                                                 isl_set_copy(pw->p[i].set), max);
1178                 if (max)
1179                         opt = isl_qpolynomial_max_cst(opt, opt_i);
1180                 else
1181                         opt = isl_qpolynomial_min_cst(opt, opt_i);
1182         }
1183
1184         FN(PW,free)(pw);
1185         return opt;
1186 }
1187
1188 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
1189 {
1190         return FN(PW,opt)(pw, 1);
1191 }
1192
1193 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
1194 {
1195         return FN(PW,opt)(pw, 0);
1196 }
1197 #endif
1198
1199 __isl_give isl_space *FN(PW,get_space)(__isl_keep PW *pw)
1200 {
1201         return pw ? isl_space_copy(pw->dim) : NULL;
1202 }
1203
1204 __isl_give isl_space *FN(PW,get_domain_space)(__isl_keep PW *pw)
1205 {
1206         return pw ? isl_space_domain(isl_space_copy(pw->dim)) : NULL;
1207 }
1208
1209 #ifndef NO_RESET_DIM
1210 /* Reset the space of "pw".  Since we don't know if the elements
1211  * represent the spaces themselves or their domains, we pass along
1212  * both when we call their reset_space_and_domain.
1213  */
1214 static __isl_give PW *FN(PW,reset_space_and_domain)(__isl_take PW *pw,
1215         __isl_take isl_space *space, __isl_take isl_space *domain)
1216 {
1217         int i;
1218
1219         pw = FN(PW,cow)(pw);
1220         if (!pw || !space || !domain)
1221                 goto error;
1222
1223         for (i = 0; i < pw->n; ++i) {
1224                 pw->p[i].set = isl_set_reset_space(pw->p[i].set,
1225                                                  isl_space_copy(domain));
1226                 if (!pw->p[i].set)
1227                         goto error;
1228                 pw->p[i].FIELD = FN(EL,reset_space_and_domain)(pw->p[i].FIELD,
1229                               isl_space_copy(space), isl_space_copy(domain));
1230                 if (!pw->p[i].FIELD)
1231                         goto error;
1232         }
1233
1234         isl_space_free(domain);
1235
1236         isl_space_free(pw->dim);
1237         pw->dim = space;
1238
1239         return pw;
1240 error:
1241         isl_space_free(domain);
1242         isl_space_free(space);
1243         FN(PW,free)(pw);
1244         return NULL;
1245 }
1246
1247 __isl_give PW *FN(PW,reset_domain_space)(__isl_take PW *pw,
1248         __isl_take isl_space *domain)
1249 {
1250         isl_space *space;
1251
1252         space = isl_space_extend_domain_with_range(isl_space_copy(domain),
1253                                                    FN(PW,get_space)(pw));
1254         return FN(PW,reset_space_and_domain)(pw, space, domain);
1255 }
1256
1257 __isl_give PW *FN(PW,reset_space)(__isl_take PW *pw, __isl_take isl_space *dim)
1258 {
1259         isl_space *domain;
1260
1261         domain = isl_space_domain(isl_space_copy(dim));
1262         return FN(PW,reset_space_and_domain)(pw, dim, domain);
1263 }
1264
1265 __isl_give PW *FN(PW,set_tuple_id)(__isl_keep PW *pw, enum isl_dim_type type,
1266         __isl_take isl_id *id)
1267 {
1268         isl_space *space;
1269
1270         pw = FN(PW,cow)(pw);
1271         if (!pw)
1272                 return isl_id_free(id);
1273
1274         space = FN(PW,get_space)(pw);
1275         space = isl_space_set_tuple_id(space, type, id);
1276
1277         return FN(PW,reset_space)(pw, space);
1278 }
1279
1280 __isl_give PW *FN(PW,set_dim_id)(__isl_take PW *pw,
1281         enum isl_dim_type type, unsigned pos, __isl_take isl_id *id)
1282 {
1283         pw = FN(PW,cow)(pw);
1284         if (!pw)
1285                 return isl_id_free(id);
1286         pw->dim = isl_space_set_dim_id(pw->dim, type, pos, id);
1287         return FN(PW,reset_space)(pw, isl_space_copy(pw->dim));
1288 }
1289 #endif
1290
1291 int FN(PW,has_equal_space)(__isl_keep PW *pw1, __isl_keep PW *pw2)
1292 {
1293         if (!pw1 || !pw2)
1294                 return -1;
1295
1296         return isl_space_is_equal(pw1->dim, pw2->dim);
1297 }
1298
1299 #ifndef NO_MORPH
1300 __isl_give PW *FN(PW,morph_domain)(__isl_take PW *pw,
1301         __isl_take isl_morph *morph)
1302 {
1303         int i;
1304         isl_ctx *ctx;
1305
1306         if (!pw || !morph)
1307                 goto error;
1308
1309         ctx = isl_space_get_ctx(pw->dim);
1310         isl_assert(ctx, isl_space_is_domain(morph->dom->dim, pw->dim),
1311                 goto error);
1312
1313         pw = FN(PW,cow)(pw);
1314         if (!pw)
1315                 goto error;
1316         pw->dim = isl_space_extend_domain_with_range(
1317                         isl_space_copy(morph->ran->dim), pw->dim);
1318         if (!pw->dim)
1319                 goto error;
1320
1321         for (i = 0; i < pw->n; ++i) {
1322                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
1323                 if (!pw->p[i].set)
1324                         goto error;
1325                 pw->p[i].FIELD = FN(EL,morph_domain)(pw->p[i].FIELD,
1326                                                 isl_morph_copy(morph));
1327                 if (!pw->p[i].FIELD)
1328                         goto error;
1329         }
1330
1331         isl_morph_free(morph);
1332
1333         return pw;
1334 error:
1335         FN(PW,free)(pw);
1336         isl_morph_free(morph);
1337         return NULL;
1338 }
1339 #endif
1340
1341 int FN(PW,n_piece)(__isl_keep PW *pw)
1342 {
1343         return pw ? pw->n : 0;
1344 }
1345
1346 int FN(PW,foreach_piece)(__isl_keep PW *pw,
1347         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
1348         void *user)
1349 {
1350         int i;
1351
1352         if (!pw)
1353                 return -1;
1354
1355         for (i = 0; i < pw->n; ++i)
1356                 if (fn(isl_set_copy(pw->p[i].set),
1357                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
1358                         return -1;
1359
1360         return 0;
1361 }
1362
1363 #ifndef NO_LIFT
1364 static int any_divs(__isl_keep isl_set *set)
1365 {
1366         int i;
1367
1368         if (!set)
1369                 return -1;
1370
1371         for (i = 0; i < set->n; ++i)
1372                 if (set->p[i]->n_div > 0)
1373                         return 1;
1374
1375         return 0;
1376 }
1377
1378 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
1379         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
1380                     void *user), void *user)
1381 {
1382         int i;
1383
1384         if (!set || !el)
1385                 goto error;
1386
1387         for (i = 0; i < set->n; ++i) {
1388                 isl_set *lift;
1389                 EL *copy;
1390
1391                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
1392                 lift = isl_set_lift(lift);
1393
1394                 copy = FN(EL,copy)(el);
1395                 copy = FN(EL,lift)(copy, isl_set_get_space(lift));
1396
1397                 if (fn(lift, copy, user) < 0)
1398                         goto error;
1399         }
1400
1401         isl_set_free(set);
1402         FN(EL,free)(el);
1403
1404         return 0;
1405 error:
1406         isl_set_free(set);
1407         FN(EL,free)(el);
1408         return -1;
1409 }
1410
1411 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
1412         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
1413                     void *user), void *user)
1414 {
1415         int i;
1416
1417         if (!pw)
1418                 return -1;
1419
1420         for (i = 0; i < pw->n; ++i) {
1421                 isl_set *set;
1422                 EL *el;
1423
1424                 set = isl_set_copy(pw->p[i].set);
1425                 el = FN(EL,copy)(pw->p[i].FIELD);
1426                 if (!any_divs(set)) {
1427                         if (fn(set, el, user) < 0)
1428                                 return -1;
1429                         continue;
1430                 }
1431                 if (foreach_lifted_subset(set, el, fn, user) < 0)
1432                         return -1;
1433         }
1434
1435         return 0;
1436 }
1437 #endif
1438
1439 #ifndef NO_MOVE_DIMS
1440 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
1441         enum isl_dim_type dst_type, unsigned dst_pos,
1442         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
1443 {
1444         int i;
1445
1446         pw = FN(PW,cow)(pw);
1447         if (!pw)
1448                 return NULL;
1449
1450         pw->dim = isl_space_move_dims(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
1451         if (!pw->dim)
1452                 goto error;
1453
1454         for (i = 0; i < pw->n; ++i) {
1455                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
1456                                         dst_type, dst_pos, src_type, src_pos, n);
1457                 if (!pw->p[i].FIELD)
1458                         goto error;
1459         }
1460
1461         if (dst_type == isl_dim_in)
1462                 dst_type = isl_dim_set;
1463         if (src_type == isl_dim_in)
1464                 src_type = isl_dim_set;
1465
1466         for (i = 0; i < pw->n; ++i) {
1467                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
1468                                                 dst_type, dst_pos,
1469                                                 src_type, src_pos, n);
1470                 if (!pw->p[i].set)
1471                         goto error;
1472         }
1473
1474         return pw;
1475 error:
1476         FN(PW,free)(pw);
1477         return NULL;
1478 }
1479 #endif
1480
1481 __isl_give PW *FN(PW,mul_isl_int)(__isl_take PW *pw, isl_int v)
1482 {
1483         int i;
1484
1485         if (isl_int_is_one(v))
1486                 return pw;
1487         if (pw && DEFAULT_IS_ZERO && isl_int_is_zero(v)) {
1488                 PW *zero;
1489                 isl_space *dim = FN(PW,get_space)(pw);
1490 #ifdef HAS_TYPE
1491                 zero = FN(PW,ZERO)(dim, pw->type);
1492 #else
1493                 zero = FN(PW,ZERO)(dim);
1494 #endif
1495                 FN(PW,free)(pw);
1496                 return zero;
1497         }
1498         pw = FN(PW,cow)(pw);
1499         if (!pw)
1500                 return NULL;
1501         if (pw->n == 0)
1502                 return pw;
1503
1504 #ifdef HAS_TYPE
1505         if (isl_int_is_neg(v))
1506                 pw->type = isl_fold_type_negate(pw->type);
1507 #endif
1508         for (i = 0; i < pw->n; ++i) {
1509                 pw->p[i].FIELD = FN(EL,scale)(pw->p[i].FIELD, v);
1510                 if (!pw->p[i].FIELD)
1511                         goto error;
1512         }
1513
1514         return pw;
1515 error:
1516         FN(PW,free)(pw);
1517         return NULL;
1518 }
1519
1520 __isl_give PW *FN(PW,scale)(__isl_take PW *pw, isl_int v)
1521 {
1522         return FN(PW,mul_isl_int)(pw, v);
1523 }
1524
1525 static int FN(PW,qsort_set_cmp)(const void *p1, const void *p2)
1526 {
1527         const isl_set *set1 = *(const isl_set **)p1;
1528         const isl_set *set2 = *(const isl_set **)p2;
1529
1530         return isl_set_plain_cmp(set1, set2);
1531 }
1532
1533 /* We normalize in place, but if anything goes wrong we need
1534  * to return NULL, so we need to make sure we don't change the
1535  * meaning of any possible other copies of map.
1536  */
1537 __isl_give PW *FN(PW,normalize)(__isl_take PW *pw)
1538 {
1539         int i, j;
1540         isl_set *set;
1541
1542         if (!pw)
1543                 return NULL;
1544         for (i = 0; i < pw->n; ++i) {
1545                 set = isl_set_normalize(isl_set_copy(pw->p[i].set));
1546                 if (!set)
1547                         return FN(PW,free)(pw);
1548                 isl_set_free(pw->p[i].set);
1549                 pw->p[i].set = set;
1550         }
1551         qsort(pw->p, pw->n, sizeof(pw->p[0]), &FN(PW,qsort_set_cmp));
1552         for (i = pw->n - 1; i >= 1; --i) {
1553                 if (!isl_set_plain_is_equal(pw->p[i - 1].set, pw->p[i].set))
1554                         continue;
1555                 if (!FN(EL,plain_is_equal)(pw->p[i - 1].FIELD, pw->p[i].FIELD))
1556                         continue;
1557                 set = isl_set_union(isl_set_copy(pw->p[i - 1].set),
1558                                     isl_set_copy(pw->p[i].set));
1559                 if (!set)
1560                         return FN(PW,free)(pw);
1561                 isl_set_free(pw->p[i].set);
1562                 FN(EL,free)(pw->p[i].FIELD);
1563                 isl_set_free(pw->p[i - 1].set);
1564                 pw->p[i - 1].set = set;
1565                 for (j = i + 1; j < pw->n; ++j)
1566                         pw->p[j - 1] = pw->p[j];
1567                 pw->n--;
1568         }
1569
1570         return pw;
1571 }
1572
1573 /* Is pw1 obviously equal to pw2?
1574  * That is, do they have obviously identical cells and obviously identical
1575  * elements on each cell?
1576  */
1577 int FN(PW,plain_is_equal)(__isl_keep PW *pw1, __isl_keep PW *pw2)
1578 {
1579         int i;
1580         int equal;
1581
1582         if (!pw1 || !pw2)
1583                 return -1;
1584
1585         if (pw1 == pw2)
1586                 return 1;
1587         if (!isl_space_is_equal(pw1->dim, pw2->dim))
1588                 return 0;
1589
1590         pw1 = FN(PW,copy)(pw1);
1591         pw2 = FN(PW,copy)(pw2);
1592         pw1 = FN(PW,normalize)(pw1);
1593         pw2 = FN(PW,normalize)(pw2);
1594         if (!pw1 || !pw2)
1595                 goto error;
1596
1597         equal = pw1->n == pw2->n;
1598         for (i = 0; equal && i < pw1->n; ++i) {
1599                 equal = isl_set_plain_is_equal(pw1->p[i].set, pw2->p[i].set);
1600                 if (equal < 0)
1601                         goto error;
1602                 if (!equal)
1603                         break;
1604                 equal = FN(EL,plain_is_equal)(pw1->p[i].FIELD, pw2->p[i].FIELD);
1605                 if (equal < 0)
1606                         goto error;
1607         }
1608
1609         FN(PW,free)(pw1);
1610         FN(PW,free)(pw2);
1611         return equal;
1612 error:
1613         FN(PW,free)(pw1);
1614         FN(PW,free)(pw2);
1615         return -1;
1616 }