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 int FN(PW,IS_ZERO)(__isl_keep PW *pw)
 177 {
 178         if (!pw)
 179                 return -1;
 180
 181         return pw->n == 0;
 182 }
 183
 184 #ifndef NO_REALIGN
 185 __isl_give PW *FN(PW,realign_domain)(__isl_take PW *pw,
 186         __isl_take isl_reordering *exp)
 187 {
 188         int i;
 189
 190         pw = FN(PW,cow)(pw);
 191         if (!pw || !exp)
 192                 return NULL;
 193
 194         for (i = 0; i < pw->n; ++i) {
 195                 pw->p[i].set = isl_set_realign(pw->p[i].set,
 196                                                     isl_reordering_copy(exp));
 197                 if (!pw->p[i].set)
 198                         goto error;
 199                 pw->p[i].FIELD = FN(EL,realign_domain)(pw->p[i].FIELD,
 200                                                     isl_reordering_copy(exp));
 201                 if (!pw->p[i].FIELD)
 202                         goto error;
 203         }
 204
 205         pw = FN(PW,reset_domain_space)(pw, isl_space_copy(exp->dim));
 206
 207         isl_reordering_free(exp);
 208         return pw;
 209 error:
 210         isl_reordering_free(exp);
 211         FN(PW,free)(pw);
 212         return NULL;
 213 }
 214
 215 /* Align the parameters of "pw" to those of "model".
 216  */
 217 __isl_give PW *FN(PW,align_params)(__isl_take PW *pw, __isl_take isl_space *model)
 218 {
 219         isl_ctx *ctx;
 220
 221         if (!pw || !model)
 222                 goto error;
 223
 224         ctx = isl_space_get_ctx(model);
 225         if (!isl_space_has_named_params(model))
 226                 isl_die(ctx, isl_error_invalid,
 227                         "model has unnamed parameters", goto error);
 228         if (!isl_space_has_named_params(pw->dim))
 229                 isl_die(ctx, isl_error_invalid,
 230                         "input has unnamed parameters", goto error);
 231         if (!isl_space_match(pw->dim, isl_dim_param, model, isl_dim_param)) {
 232                 isl_reordering *exp;
 233
 234                 model = isl_space_drop_dims(model, isl_dim_in,
 235                                         0, isl_space_dim(model, isl_dim_in));
 236                 model = isl_space_drop_dims(model, isl_dim_out,
 237                                         0, isl_space_dim(model, isl_dim_out));
 238                 exp = isl_parameter_alignment_reordering(pw->dim, model);
 239                 exp = isl_reordering_extend_space(exp,
 240                                         FN(PW,get_domain_space)(pw));
 241                 pw = FN(PW,realign_domain)(pw, exp);
 242         }
 243
 244         isl_space_free(model);
 245         return pw;
 246 error:
 247         isl_space_free(model);
 248         FN(PW,free)(pw);
 249         return NULL;
 250 }
 251
 252 static __isl_give PW *align_params_pw_pw_and(__isl_take PW *pw1,
 253         __isl_take PW *pw2,
 254         __isl_give PW *(*fn)(__isl_take PW *pw1, __isl_take PW *pw2))
 255 {
 256         isl_ctx *ctx;
 257
 258         if (!pw1 || !pw2)
 259                 goto error;
 260         if (isl_space_match(pw1->dim, isl_dim_param, pw2->dim, isl_dim_param))
 261                 return fn(pw1, pw2);
 262         ctx = FN(PW,get_ctx)(pw1);
 263         if (!isl_space_has_named_params(pw1->dim) ||
 264             !isl_space_has_named_params(pw2->dim))
 265                 isl_die(ctx, isl_error_invalid,
 266                         "unaligned unnamed parameters", goto error);
 267         pw1 = FN(PW,align_params)(pw1, FN(PW,get_space)(pw2));
 268         pw2 = FN(PW,align_params)(pw2, FN(PW,get_space)(pw1));
 269         return fn(pw1, pw2);
 270 error:
 271         FN(PW,free)(pw1);
 272         FN(PW,free)(pw2);
 273         return NULL;
 274 }
 275
 276 static __isl_give PW *align_params_pw_set_and(__isl_take PW *pw,
 277         __isl_take isl_set *set,
 278         __isl_give PW *(*fn)(__isl_take PW *pw, __isl_take isl_set *set))
 279 {
 280         isl_ctx *ctx;
 281
 282         if (!pw || !set)
 283                 goto error;
 284         if (isl_space_match(pw->dim, isl_dim_param, set->dim, isl_dim_param))
 285                 return fn(pw, set);
 286         ctx = FN(PW,get_ctx)(pw);
 287         if (!isl_space_has_named_params(pw->dim) ||
 288             !isl_space_has_named_params(set->dim))
 289                 isl_die(ctx, isl_error_invalid,
 290                         "unaligned unnamed parameters", goto error);
 291         pw = FN(PW,align_params)(pw, isl_set_get_space(set));
 292         set = isl_set_align_params(set, FN(PW,get_space)(pw));
 293         return fn(pw, set);
 294 error:
 295         FN(PW,free)(pw);
 296         isl_set_free(set);
 297         return NULL;
 298 }
 299 #endif
 300
 301 static __isl_give PW *FN(PW,add_aligned)(__isl_take PW *pw1, __isl_take PW *pw2)
 302 {
 303         int i, j, n;
 304         struct PW *res;
 305         isl_ctx *ctx;
 306         isl_set *set;
 307
 308         if (!pw1 || !pw2)
 309                 goto error;
 310
 311         ctx = isl_space_get_ctx(pw1->dim);
 312 #ifdef HAS_TYPE
 313         if (pw1->type != pw2->type)
 314                 isl_die(ctx, isl_error_invalid,
 315                         "fold types don't match", goto error);
 316 #endif
 317         isl_assert(ctx, isl_space_is_equal(pw1->dim, pw2->dim), goto error);
 318
 319         if (FN(PW,IS_ZERO)(pw1)) {
 320                 FN(PW,free)(pw1);
 321                 return pw2;
 322         }
 323
 324         if (FN(PW,IS_ZERO)(pw2)) {
 325                 FN(PW,free)(pw2);
 326                 return pw1;
 327         }
 328
 329         n = (pw1->n + 1) * (pw2->n + 1);
 330 #ifdef HAS_TYPE
 331         res = FN(PW,alloc_size)(isl_space_copy(pw1->dim), pw1->type, n);
 332 #else
 333         res = FN(PW,alloc_size)(isl_space_copy(pw1->dim), n);
 334 #endif
 335
 336         for (i = 0; i < pw1->n; ++i) {
 337                 set = isl_set_copy(pw1->p[i].set);
 338                 for (j = 0; j < pw2->n; ++j) {
 339                         struct isl_set *common;
 340                         EL *sum;
 341                         set = isl_set_subtract(set,
 342                                         isl_set_copy(pw2->p[j].set));
 343                         common = isl_set_intersect(isl_set_copy(pw1->p[i].set),
 344                                                 isl_set_copy(pw2->p[j].set));
 345                         if (isl_set_plain_is_empty(common)) {
 346                                 isl_set_free(common);
 347                                 continue;
 348                         }
 349
 350                         sum = FN(EL,add_on_domain)(common,
 351                                                    FN(EL,copy)(pw1->p[i].FIELD),
 352                                                    FN(EL,copy)(pw2->p[j].FIELD));
 353
 354                         res = FN(PW,add_piece)(res, common, sum);
 355                 }
 356                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw1->p[i].FIELD));
 357         }
 358
 359         for (j = 0; j < pw2->n; ++j) {
 360                 set = isl_set_copy(pw2->p[j].set);
 361                 for (i = 0; i < pw1->n; ++i)
 362                         set = isl_set_subtract(set,
 363                                         isl_set_copy(pw1->p[i].set));
 364                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw2->p[j].FIELD));
 365         }
 366
 367         FN(PW,free)(pw1);
 368         FN(PW,free)(pw2);
 369
 370         return res;
 371 error:
 372         FN(PW,free)(pw1);
 373         FN(PW,free)(pw2);
 374         return NULL;
 375 }
 376
 377 __isl_give PW *FN(PW,add)(__isl_take PW *pw1, __isl_take PW *pw2)
 378 {
 379         return align_params_pw_pw_and(pw1, pw2, &FN(PW,add_aligned));
 380 }
 381
 382 /* Make sure "pw" has room for at least "n" more pieces.
 383  *
 384  * If there is only one reference to pw, we extend it in place.
 385  * Otherwise, we create a new PW and copy the pieces.
 386  */
 387 static __isl_give PW *FN(PW,grow)(__isl_take PW *pw, int n)
 388 {
 389         int i;
 390         isl_ctx *ctx;
 391         PW *res;
 392
 393         if (!pw)
 394                 return NULL;
 395         if (pw->n + n <= pw->size)
 396                 return pw;
 397         ctx = FN(PW,get_ctx)(pw);
 398         n += pw->n;
 399         if (pw->ref == 1) {
 400                 res = isl_realloc(ctx, pw, struct PW,
 401                             sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
 402                 if (!res)
 403                         return FN(PW,free)(pw);
 404                 res->size = n;
 405                 return res;
 406         }
 407 #ifdef HAS_TYPE
 408         res = FN(PW,alloc_size)(isl_space_copy(pw->dim), pw->type, n);
 409 #else
 410         res = FN(PW,alloc_size)(isl_space_copy(pw->dim), n);
 411 #endif
 412         if (!res)
 413                 return FN(PW,free)(pw);
 414         for (i = 0; i < pw->n; ++i)
 415                 res = FN(PW,add_piece)(res, isl_set_copy(pw->p[i].set),
 416                                             FN(EL,copy)(pw->p[i].FIELD));
 417         FN(PW,free)(pw);
 418         return res;
 419 }
 420
 421 static __isl_give PW *FN(PW,add_disjoint_aligned)(__isl_take PW *pw1,
 422         __isl_take PW *pw2)
 423 {
 424         int i;
 425         isl_ctx *ctx;
 426
 427         if (!pw1 || !pw2)
 428                 goto error;
 429
 430         if (pw1->size < pw1->n + pw2->n && pw1->n < pw2->n)
 431                 return FN(PW,add_disjoint_aligned)(pw2, pw1);
 432
 433         ctx = isl_space_get_ctx(pw1->dim);
 434 #ifdef HAS_TYPE
 435         if (pw1->type != pw2->type)
 436                 isl_die(ctx, isl_error_invalid,
 437                         "fold types don't match", goto error);
 438 #endif
 439         isl_assert(ctx, isl_space_is_equal(pw1->dim, pw2->dim), goto error);
 440
 441         if (FN(PW,IS_ZERO)(pw1)) {
 442                 FN(PW,free)(pw1);
 443                 return pw2;
 444         }
 445
 446         if (FN(PW,IS_ZERO)(pw2)) {
 447                 FN(PW,free)(pw2);
 448                 return pw1;
 449         }
 450
 451         pw1 = FN(PW,grow)(pw1, pw2->n);
 452         if (!pw1)
 453                 goto error;
 454
 455         for (i = 0; i < pw2->n; ++i)
 456                 pw1 = FN(PW,add_piece)(pw1,
 457                                 isl_set_copy(pw2->p[i].set),
 458                                 FN(EL,copy)(pw2->p[i].FIELD));
 459
 460         FN(PW,free)(pw2);
 461
 462         return pw1;
 463 error:
 464         FN(PW,free)(pw1);
 465         FN(PW,free)(pw2);
 466         return NULL;
 467 }
 468
 469 __isl_give PW *FN(PW,add_disjoint)(__isl_take PW *pw1, __isl_take PW *pw2)
 470 {
 471         return align_params_pw_pw_and(pw1, pw2, &FN(PW,add_disjoint_aligned));
 472 }
 473
 474 #ifndef NO_NEG
 475 __isl_give PW *FN(PW,neg)(__isl_take PW *pw)
 476 {
 477         int i;
 478
 479         if (!pw)
 480                 return NULL;
 481
 482         if (FN(PW,IS_ZERO)(pw))
 483                 return pw;
 484
 485         pw = FN(PW,cow)(pw);
 486         if (!pw)
 487                 return NULL;
 488
 489         for (i = 0; i < pw->n; ++i) {
 490                 pw->p[i].FIELD = FN(EL,neg)(pw->p[i].FIELD);
 491                 if (!pw->p[i].FIELD)
 492                         return FN(PW,free)(pw);
 493         }
 494
 495         return pw;
 496 }
 497
 498 __isl_give PW *FN(PW,sub)(__isl_take PW *pw1, __isl_take PW *pw2)
 499 {
 500         return FN(PW,add)(pw1, FN(PW,neg)(pw2));
 501 }
 502 #endif
 503
 504 #ifndef NO_EVAL
 505 __isl_give isl_qpolynomial *FN(PW,eval)(__isl_take PW *pw,
 506         __isl_take isl_point *pnt)
 507 {
 508         int i;
 509         int found = 0;
 510         isl_ctx *ctx;
 511         isl_space *pnt_dim = NULL;
 512         isl_qpolynomial *qp;
 513
 514         if (!pw || !pnt)
 515                 goto error;
 516         ctx = isl_point_get_ctx(pnt);
 517         pnt_dim = isl_point_get_space(pnt);
 518         isl_assert(ctx, isl_space_is_domain(pnt_dim, pw->dim), goto error);
 519
 520         for (i = 0; i < pw->n; ++i) {
 521                 found = isl_set_contains_point(pw->p[i].set, pnt);
 522                 if (found < 0)
 523                         goto error;
 524                 if (found)
 525                         break;
 526         }
 527         if (found)
 528                 qp = FN(EL,eval)(FN(EL,copy)(pw->p[i].FIELD),
 529                                             isl_point_copy(pnt));
 530         else
 531                 qp = isl_qpolynomial_zero_on_domain(FN(PW,get_domain_space)(pw));
 532         FN(PW,free)(pw);
 533         isl_space_free(pnt_dim);
 534         isl_point_free(pnt);
 535         return qp;
 536 error:
 537         FN(PW,free)(pw);
 538         isl_space_free(pnt_dim);
 539         isl_point_free(pnt);
 540         return NULL;
 541 }
 542 #endif
 543
 544 __isl_give isl_set *FN(PW,domain)(__isl_take PW *pw)
 545 {
 546         int i;
 547         isl_set *dom;
 548
 549         if (!pw)
 550                 return NULL;
 551
 552         dom = isl_set_empty(FN(PW,get_domain_space)(pw));
 553         for (i = 0; i < pw->n; ++i)
 554                 dom = isl_set_union_disjoint(dom, isl_set_copy(pw->p[i].set));
 555
 556         FN(PW,free)(pw);
 557
 558         return dom;
 559 }
 560
 561 static __isl_give PW *FN(PW,intersect_domain_aligned)(__isl_take PW *pw,
 562         __isl_take isl_set *set)
 563 {
 564         int i;
 565
 566         if (!pw || !set)
 567                 goto error;
 568
 569         if (pw->n == 0) {
 570                 isl_set_free(set);
 571                 return pw;
 572         }
 573
 574         pw = FN(PW,cow)(pw);
 575         if (!pw)
 576                 goto error;
 577
 578         for (i = pw->n - 1; i >= 0; --i) {
 579                 isl_basic_set *aff;
 580                 pw->p[i].set = isl_set_intersect(pw->p[i].set, isl_set_copy(set));
 581                 if (!pw->p[i].set)
 582                         goto error;
 583                 aff = isl_set_affine_hull(isl_set_copy(pw->p[i].set));
 584                 pw->p[i].FIELD = FN(EL,substitute_equalities)(pw->p[i].FIELD,
 585                                                                 aff);
 586                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 587                         isl_set_free(pw->p[i].set);
 588                         FN(EL,free)(pw->p[i].FIELD);
 589                         if (i != pw->n - 1)
 590                                 pw->p[i] = pw->p[pw->n - 1];
 591                         pw->n--;
 592                 }
 593         }
 594
 595         isl_set_free(set);
 596         return pw;
 597 error:
 598         isl_set_free(set);
 599         FN(PW,free)(pw);
 600         return NULL;
 601 }
 602
 603 __isl_give PW *FN(PW,intersect_domain)(__isl_take PW *pw,
 604         __isl_take isl_set *context)
 605 {
 606         return align_params_pw_set_and(pw, context,
 607                                         &FN(PW,intersect_domain_aligned));
 608 }
 609
 610 static __isl_give PW *FN(PW,gist_aligned)(__isl_take PW *pw,
 611         __isl_take isl_set *context)
 612 {
 613         int i;
 614         isl_basic_set *hull = NULL;
 615
 616         if (!pw || !context)
 617                 goto error;
 618
 619         if (pw->n == 0) {
 620                 isl_set_free(context);
 621                 return pw;
 622         }
 623
 624         if (!isl_space_match(pw->dim, isl_dim_param,
 625                                 context->dim, isl_dim_param)) {
 626                 pw = FN(PW,align_params)(pw, isl_set_get_space(context));
 627                 context = isl_set_align_params(context, FN(PW,get_space)(pw));
 628         }
 629
 630         context = isl_set_compute_divs(context);
 631         hull = isl_set_simple_hull(isl_set_copy(context));
 632
 633         pw = FN(PW,cow)(pw);
 634         if (!pw)
 635                 goto error;
 636
 637         for (i = pw->n - 1; i >= 0; --i) {
 638                 pw->p[i].set = isl_set_intersect(pw->p[i].set,
 639                                                  isl_set_copy(context));
 640                 if (!pw->p[i].set)
 641                         goto error;
 642                 pw->p[i].FIELD = FN(EL,gist)(pw->p[i].FIELD,
 643                                              isl_set_copy(pw->p[i].set));
 644                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 645                                                 isl_basic_set_copy(hull));
 646                 if (!pw->p[i].set)
 647                         goto error;
 648                 if (isl_set_plain_is_empty(pw->p[i].set)) {
 649                         isl_set_free(pw->p[i].set);
 650                         FN(EL,free)(pw->p[i].FIELD);
 651                         if (i != pw->n - 1)
 652                                 pw->p[i] = pw->p[pw->n - 1];
 653                         pw->n--;
 654                 }
 655         }
 656
 657         isl_basic_set_free(hull);
 658         isl_set_free(context);
 659
 660         return pw;
 661 error:
 662         FN(PW,free)(pw);
 663         isl_basic_set_free(hull);
 664         isl_set_free(context);
 665         return NULL;
 666 }
 667
 668 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
 669 {
 670         return align_params_pw_set_and(pw, context, &FN(PW,gist_aligned));
 671 }
 672
 673 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 674 {
 675         int i, j;
 676
 677         if (!pw)
 678                 return NULL;
 679         if (pw->n == 0)
 680                 return pw;
 681
 682         for (i = pw->n - 1; i >= 0; --i) {
 683                 for (j = i - 1; j >= 0; --j) {
 684                         if (!FN(EL,plain_is_equal)(pw->p[i].FIELD,
 685                                                         pw->p[j].FIELD))
 686                                 continue;
 687                         pw->p[j].set = isl_set_union(pw->p[j].set,
 688                                                         pw->p[i].set);
 689                         FN(EL,free)(pw->p[i].FIELD);
 690                         if (i != pw->n - 1)
 691                                 pw->p[i] = pw->p[pw->n - 1];
 692                         pw->n--;
 693                         break;
 694                 }
 695                 if (j >= 0)
 696                         continue;
 697                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 698                 if (!pw->p[i].set)
 699                         goto error;
 700         }
 701
 702         return pw;
 703 error:
 704         FN(PW,free)(pw);
 705         return NULL;
 706 }
 707
 708 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 709 {
 710         return pw ? isl_space_get_ctx(pw->dim) : NULL;
 711 }
 712
 713 #ifndef NO_INVOLVES_DIMS
 714 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 715         unsigned first, unsigned n)
 716 {
 717         int i;
 718         enum isl_dim_type set_type;
 719
 720         if (!pw)
 721                 return -1;
 722         if (pw->n == 0 || n == 0)
 723                 return 0;
 724
 725         set_type = type == isl_dim_in ? isl_dim_set : type;
 726
 727         for (i = 0; i < pw->n; ++i) {
 728                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 729                                                         type, first, n);
 730                 if (involves < 0 || involves)
 731                         return involves;
 732                 involves = isl_set_involves_dims(pw->p[i].set,
 733                                                         set_type, first, n);
 734                 if (involves < 0 || involves)
 735                         return involves;
 736         }
 737         return 0;
 738 }
 739 #endif
 740
 741 __isl_give PW *FN(PW,set_dim_name)(__isl_take PW *pw,
 742         enum isl_dim_type type, unsigned pos, const char *s)
 743 {
 744         int i;
 745         enum isl_dim_type set_type;
 746
 747         pw = FN(PW,cow)(pw);
 748         if (!pw)
 749                 return NULL;
 750
 751         set_type = type == isl_dim_in ? isl_dim_set : type;
 752
 753         pw->dim = isl_space_set_dim_name(pw->dim, type, pos, s);
 754         if (!pw->dim)
 755                 goto error;
 756
 757         for (i = 0; i < pw->n; ++i) {
 758                 pw->p[i].set = isl_set_set_dim_name(pw->p[i].set,
 759                                                         set_type, pos, s);
 760                 if (!pw->p[i].set)
 761                         goto error;
 762                 pw->p[i].FIELD = FN(EL,set_dim_name)(pw->p[i].FIELD, type, pos, s);
 763                 if (!pw->p[i].FIELD)
 764                         goto error;
 765         }
 766
 767         return pw;
 768 error:
 769         FN(PW,free)(pw);
 770         return NULL;
 771 }
 772
 773 #ifndef NO_DROP_DIMS
 774 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 775         enum isl_dim_type type, unsigned first, unsigned n)
 776 {
 777         int i;
 778         enum isl_dim_type set_type;
 779
 780         if (!pw)
 781                 return NULL;
 782         if (n == 0 && !isl_space_get_tuple_name(pw->dim, type))
 783                 return pw;
 784
 785         set_type = type == isl_dim_in ? isl_dim_set : type;
 786
 787         pw = FN(PW,cow)(pw);
 788         if (!pw)
 789                 return NULL;
 790         pw->dim = isl_space_drop_dims(pw->dim, type, first, n);
 791         if (!pw->dim)
 792                 goto error;
 793         for (i = 0; i < pw->n; ++i) {
 794                 pw->p[i].set = isl_set_drop(pw->p[i].set, set_type, first, n);
 795                 if (!pw->p[i].set)
 796                         goto error;
 797                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 798                 if (!pw->p[i].FIELD)
 799                         goto error;
 800         }
 801
 802         return pw;
 803 error:
 804         FN(PW,free)(pw);
 805         return NULL;
 806 }
 807
 808 /* This function is very similar to drop_dims.
 809  * The only difference is that the cells may still involve
 810  * the specified dimensions.  They are removed using
 811  * isl_set_project_out instead of isl_set_drop.
 812  */
 813 __isl_give PW *FN(PW,project_out)(__isl_take PW *pw,
 814         enum isl_dim_type type, unsigned first, unsigned n)
 815 {
 816         int i;
 817         enum isl_dim_type set_type;
 818
 819         if (!pw)
 820                 return NULL;
 821         if (n == 0 && !isl_space_get_tuple_name(pw->dim, type))
 822                 return pw;
 823
 824         set_type = type == isl_dim_in ? isl_dim_set : type;
 825
 826         pw = FN(PW,cow)(pw);
 827         if (!pw)
 828                 return NULL;
 829         pw->dim = isl_space_drop_dims(pw->dim, type, first, n);
 830         if (!pw->dim)
 831                 goto error;
 832         for (i = 0; i < pw->n; ++i) {
 833                 pw->p[i].set = isl_set_project_out(pw->p[i].set,
 834                                                         set_type, first, n);
 835                 if (!pw->p[i].set)
 836                         goto error;
 837                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 838                 if (!pw->p[i].FIELD)
 839                         goto error;
 840         }
 841
 842         return pw;
 843 error:
 844         FN(PW,free)(pw);
 845         return NULL;
 846 }
 847
 848 /* Project the domain of pw onto its parameter space.
 849  */
 850 __isl_give PW *FN(PW,project_domain_on_params)(__isl_take PW *pw)
 851 {
 852         isl_space *space;
 853         unsigned n;
 854
 855         n = FN(PW,dim)(pw, isl_dim_in);
 856         pw = FN(PW,project_out)(pw, isl_dim_in, 0, n);
 857         space = FN(PW,get_domain_space)(pw);
 858         space = isl_space_params(space);
 859         pw = FN(PW,reset_domain_space)(pw, space);
 860         return pw;
 861 }
 862 #endif
 863
 864 #ifndef NO_INSERT_DIMS
 865 __isl_give PW *FN(PW,insert_dims)(__isl_take PW *pw, enum isl_dim_type type,
 866         unsigned first, unsigned n)
 867 {
 868         int i;
 869         enum isl_dim_type set_type;
 870
 871         if (!pw)
 872                 return NULL;
 873         if (n == 0 && !isl_space_is_named_or_nested(pw->dim, type))
 874                 return pw;
 875
 876         set_type = type == isl_dim_in ? isl_dim_set : type;
 877
 878         pw = FN(PW,cow)(pw);
 879         if (!pw)
 880                 return NULL;
 881
 882         pw->dim = isl_space_insert_dims(pw->dim, type, first, n);
 883         if (!pw->dim)
 884                 goto error;
 885
 886         for (i = 0; i < pw->n; ++i) {
 887                 pw->p[i].set = isl_set_insert_dims(pw->p[i].set,
 888                                                             set_type, first, n);
 889                 if (!pw->p[i].set)
 890                         goto error;
 891                 pw->p[i].FIELD = FN(EL,insert_dims)(pw->p[i].FIELD,
 892                                                                 type, first, n);
 893                 if (!pw->p[i].FIELD)
 894                         goto error;
 895         }
 896
 897         return pw;
 898 error:
 899         FN(PW,free)(pw);
 900         return NULL;
 901 }
 902 #endif
 903
 904 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
 905         enum isl_dim_type type, unsigned pos, isl_int v)
 906 {
 907         int i;
 908
 909         if (!pw)
 910                 return NULL;
 911
 912         if (type == isl_dim_in)
 913                 type = isl_dim_set;
 914
 915         pw = FN(PW,cow)(pw);
 916         if (!pw)
 917                 return NULL;
 918         for (i = 0; i < pw->n; ++i) {
 919                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
 920                 if (!pw->p[i].set)
 921                         goto error;
 922         }
 923
 924         return pw;
 925 error:
 926         FN(PW,free)(pw);
 927         return NULL;
 928 }
 929
 930 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
 931 {
 932         return pw ? isl_space_dim(pw->dim, type) : 0;
 933 }
 934
 935 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
 936         enum isl_dim_type type, unsigned first, unsigned n)
 937 {
 938         int i;
 939
 940         if (!pw)
 941                 return NULL;
 942         if (n == 0)
 943                 return pw;
 944
 945         if (type == isl_dim_in)
 946                 type = isl_dim_set;
 947
 948         pw = FN(PW,cow)(pw);
 949         if (!pw)
 950                 return NULL;
 951         if (!pw->dim)
 952                 goto error;
 953         for (i = 0; i < pw->n; ++i) {
 954                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
 955                 if (!pw->p[i].set)
 956                         goto error;
 957         }
 958
 959         return pw;
 960 error:
 961         FN(PW,free)(pw);
 962         return NULL;
 963 }
 964
 965 #ifndef NO_OPT
 966 /* Compute the maximal value attained by the piecewise quasipolynomial
 967  * on its domain or zero if the domain is empty.
 968  * In the worst case, the domain is scanned completely,
 969  * so the domain is assumed to be bounded.
 970  */
 971 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
 972 {
 973         int i;
 974         isl_qpolynomial *opt;
 975
 976         if (!pw)
 977                 return NULL;
 978
 979         if (pw->n == 0) {
 980                 isl_space *dim = isl_space_copy(pw->dim);
 981                 FN(PW,free)(pw);
 982                 return isl_qpolynomial_zero_on_domain(dim);
 983         }
 984
 985         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
 986                                         isl_set_copy(pw->p[0].set), max);
 987         for (i = 1; i < pw->n; ++i) {
 988                 isl_qpolynomial *opt_i;
 989                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
 990                                                 isl_set_copy(pw->p[i].set), max);
 991                 if (max)
 992                         opt = isl_qpolynomial_max_cst(opt, opt_i);
 993                 else
 994                         opt = isl_qpolynomial_min_cst(opt, opt_i);
 995         }
 996
 997         FN(PW,free)(pw);
 998         return opt;
 999 }
1000
1001 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
1002 {
1003         return FN(PW,opt)(pw, 1);
1004 }
1005
1006 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
1007 {
1008         return FN(PW,opt)(pw, 0);
1009 }
1010 #endif
1011
1012 __isl_give isl_space *FN(PW,get_space)(__isl_keep PW *pw)
1013 {
1014         return pw ? isl_space_copy(pw->dim) : NULL;
1015 }
1016
1017 __isl_give isl_space *FN(PW,get_domain_space)(__isl_keep PW *pw)
1018 {
1019         return pw ? isl_space_domain(isl_space_copy(pw->dim)) : NULL;
1020 }
1021
1022 #ifndef NO_RESET_DIM
1023 /* Reset the space of "pw".  Since we don't know if the elements
1024  * represent the spaces themselves or their domains, we pass along
1025  * both when we call their reset_space_and_domain.
1026  */
1027 static __isl_give PW *FN(PW,reset_space_and_domain)(__isl_take PW *pw,
1028         __isl_take isl_space *space, __isl_take isl_space *domain)
1029 {
1030         int i;
1031
1032         pw = FN(PW,cow)(pw);
1033         if (!pw || !space || !domain)
1034                 goto error;
1035
1036         for (i = 0; i < pw->n; ++i) {
1037                 pw->p[i].set = isl_set_reset_space(pw->p[i].set,
1038                                                  isl_space_copy(domain));
1039                 if (!pw->p[i].set)
1040                         goto error;
1041                 pw->p[i].FIELD = FN(EL,reset_space_and_domain)(pw->p[i].FIELD,
1042                               isl_space_copy(space), isl_space_copy(domain));
1043                 if (!pw->p[i].FIELD)
1044                         goto error;
1045         }
1046
1047         isl_space_free(domain);
1048
1049         isl_space_free(pw->dim);
1050         pw->dim = space;
1051
1052         return pw;
1053 error:
1054         isl_space_free(domain);
1055         isl_space_free(space);
1056         FN(PW,free)(pw);
1057         return NULL;
1058 }
1059
1060 __isl_give PW *FN(PW,reset_domain_space)(__isl_take PW *pw,
1061         __isl_take isl_space *domain)
1062 {
1063         isl_space *space;
1064
1065         space = isl_space_extend_domain_with_range(isl_space_copy(domain),
1066                                                    FN(PW,get_space)(pw));
1067         return FN(PW,reset_space_and_domain)(pw, space, domain);
1068 }
1069
1070 __isl_give PW *FN(PW,reset_space)(__isl_take PW *pw, __isl_take isl_space *dim)
1071 {
1072         isl_space *domain;
1073
1074         domain = isl_space_domain(isl_space_copy(dim));
1075         return FN(PW,reset_space_and_domain)(pw, dim, domain);
1076 }
1077 #endif
1078
1079 int FN(PW,has_equal_space)(__isl_keep PW *pw1, __isl_keep PW *pw2)
1080 {
1081         if (!pw1 || !pw2)
1082                 return -1;
1083
1084         return isl_space_is_equal(pw1->dim, pw2->dim);
1085 }
1086
1087 #ifndef NO_MORPH
1088 __isl_give PW *FN(PW,morph_domain)(__isl_take PW *pw,
1089         __isl_take isl_morph *morph)
1090 {
1091         int i;
1092         isl_ctx *ctx;
1093
1094         if (!pw || !morph)
1095                 goto error;
1096
1097         ctx = isl_space_get_ctx(pw->dim);
1098         isl_assert(ctx, isl_space_is_domain(morph->dom->dim, pw->dim),
1099                 goto error);
1100
1101         pw = FN(PW,cow)(pw);
1102         if (!pw)
1103                 goto error;
1104         pw->dim = isl_space_extend_domain_with_range(
1105                         isl_space_copy(morph->ran->dim), pw->dim);
1106         if (!pw->dim)
1107                 goto error;
1108
1109         for (i = 0; i < pw->n; ++i) {
1110                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
1111                 if (!pw->p[i].set)
1112                         goto error;
1113                 pw->p[i].FIELD = FN(EL,morph_domain)(pw->p[i].FIELD,
1114                                                 isl_morph_copy(morph));
1115                 if (!pw->p[i].FIELD)
1116                         goto error;
1117         }
1118
1119         isl_morph_free(morph);
1120
1121         return pw;
1122 error:
1123         FN(PW,free)(pw);
1124         isl_morph_free(morph);
1125         return NULL;
1126 }
1127 #endif
1128
1129 int FN(PW,foreach_piece)(__isl_keep PW *pw,
1130         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
1131         void *user)
1132 {
1133         int i;
1134
1135         if (!pw)
1136                 return -1;
1137
1138         for (i = 0; i < pw->n; ++i)
1139                 if (fn(isl_set_copy(pw->p[i].set),
1140                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
1141                         return -1;
1142
1143         return 0;
1144 }
1145
1146 #ifndef NO_LIFT
1147 static int any_divs(__isl_keep isl_set *set)
1148 {
1149         int i;
1150
1151         if (!set)
1152                 return -1;
1153
1154         for (i = 0; i < set->n; ++i)
1155                 if (set->p[i]->n_div > 0)
1156                         return 1;
1157
1158         return 0;
1159 }
1160
1161 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
1162         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
1163                     void *user), void *user)
1164 {
1165         int i;
1166
1167         if (!set || !el)
1168                 goto error;
1169
1170         for (i = 0; i < set->n; ++i) {
1171                 isl_set *lift;
1172                 EL *copy;
1173
1174                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
1175                 lift = isl_set_lift(lift);
1176
1177                 copy = FN(EL,copy)(el);
1178                 copy = FN(EL,lift)(copy, isl_set_get_space(lift));
1179
1180                 if (fn(lift, copy, user) < 0)
1181                         goto error;
1182         }
1183
1184         isl_set_free(set);
1185         FN(EL,free)(el);
1186
1187         return 0;
1188 error:
1189         isl_set_free(set);
1190         FN(EL,free)(el);
1191         return -1;
1192 }
1193
1194 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
1195         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
1196                     void *user), void *user)
1197 {
1198         int i;
1199
1200         if (!pw)
1201                 return -1;
1202
1203         for (i = 0; i < pw->n; ++i) {
1204                 isl_set *set;
1205                 EL *el;
1206
1207                 set = isl_set_copy(pw->p[i].set);
1208                 el = FN(EL,copy)(pw->p[i].FIELD);
1209                 if (!any_divs(set)) {
1210                         if (fn(set, el, user) < 0)
1211                                 return -1;
1212                         continue;
1213                 }
1214                 if (foreach_lifted_subset(set, el, fn, user) < 0)
1215                         return -1;
1216         }
1217
1218         return 0;
1219 }
1220 #endif
1221
1222 #ifndef NO_MOVE_DIMS
1223 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
1224         enum isl_dim_type dst_type, unsigned dst_pos,
1225         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
1226 {
1227         int i;
1228
1229         pw = FN(PW,cow)(pw);
1230         if (!pw)
1231                 return NULL;
1232
1233         pw->dim = isl_space_move_dims(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
1234         if (!pw->dim)
1235                 goto error;
1236
1237         for (i = 0; i < pw->n; ++i) {
1238                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
1239                                         dst_type, dst_pos, src_type, src_pos, n);
1240                 if (!pw->p[i].FIELD)
1241                         goto error;
1242         }
1243
1244         if (dst_type == isl_dim_in)
1245                 dst_type = isl_dim_set;
1246         if (src_type == isl_dim_in)
1247                 src_type = isl_dim_set;
1248
1249         for (i = 0; i < pw->n; ++i) {
1250                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
1251                                                 dst_type, dst_pos,
1252                                                 src_type, src_pos, n);
1253                 if (!pw->p[i].set)
1254                         goto error;
1255         }
1256
1257         return pw;
1258 error:
1259         FN(PW,free)(pw);
1260         return NULL;
1261 }
1262 #endif
1263
1264 __isl_give PW *FN(PW,mul_isl_int)(__isl_take PW *pw, isl_int v)
1265 {
1266         int i;
1267
1268         if (isl_int_is_one(v))
1269                 return pw;
1270         if (pw && isl_int_is_zero(v)) {
1271                 PW *zero;
1272                 isl_space *dim = FN(PW,get_space)(pw);
1273 #ifdef HAS_TYPE
1274                 zero = FN(PW,ZERO)(dim, pw->type);
1275 #else
1276                 zero = FN(PW,ZERO)(dim);
1277 #endif
1278                 FN(PW,free)(pw);
1279                 return zero;
1280         }
1281         pw = FN(PW,cow)(pw);
1282         if (!pw)
1283                 return NULL;
1284         if (pw->n == 0)
1285                 return pw;
1286
1287 #ifdef HAS_TYPE
1288         if (isl_int_is_neg(v))
1289                 pw->type = isl_fold_type_negate(pw->type);
1290 #endif
1291         for (i = 0; i < pw->n; ++i) {
1292                 pw->p[i].FIELD = FN(EL,scale)(pw->p[i].FIELD, v);
1293                 if (!pw->p[i].FIELD)
1294                         goto error;
1295         }
1296
1297         return pw;
1298 error:
1299         FN(PW,free)(pw);
1300         return NULL;
1301 }
1302
1303 __isl_give PW *FN(PW,scale)(__isl_take PW *pw, isl_int v)
1304 {
1305         return FN(PW,mul_isl_int)(pw, v);
1306 }
1307
1308 static int FN(PW,qsort_set_cmp)(const void *p1, const void *p2)
1309 {
1310         const isl_set *set1 = *(const isl_set **)p1;
1311         const isl_set *set2 = *(const isl_set **)p2;
1312
1313         return isl_set_plain_cmp(set1, set2);
1314 }
1315
1316 /* We normalize in place, but if anything goes wrong we need
1317  * to return NULL, so we need to make sure we don't change the
1318  * meaning of any possible other copies of map.
1319  */
1320 __isl_give PW *FN(PW,normalize)(__isl_take PW *pw)
1321 {
1322         int i, j;
1323         isl_set *set;
1324
1325         if (!pw)
1326                 return NULL;
1327         for (i = 0; i < pw->n; ++i) {
1328                 set = isl_set_normalize(isl_set_copy(pw->p[i].set));
1329                 if (!set)
1330                         return FN(PW,free)(pw);
1331                 isl_set_free(pw->p[i].set);
1332                 pw->p[i].set = set;
1333         }
1334         qsort(pw->p, pw->n, sizeof(pw->p[0]), &FN(PW,qsort_set_cmp));
1335         for (i = pw->n - 1; i >= 1; --i) {
1336                 if (!isl_set_plain_is_equal(pw->p[i - 1].set, pw->p[i].set))
1337                         continue;
1338                 if (!FN(EL,plain_is_equal)(pw->p[i - 1].FIELD, pw->p[i].FIELD))
1339                         continue;
1340                 set = isl_set_union(isl_set_copy(pw->p[i - 1].set),
1341                                     isl_set_copy(pw->p[i].set));
1342                 if (!set)
1343                         return FN(PW,free)(pw);
1344                 isl_set_free(pw->p[i].set);
1345                 FN(EL,free)(pw->p[i].FIELD);
1346                 isl_set_free(pw->p[i - 1].set);
1347                 pw->p[i - 1].set = set;
1348                 for (j = i + 1; j < pw->n; ++j)
1349                         pw->p[j - 1] = pw->p[j];
1350                 pw->n--;
1351         }
1352
1353         return pw;
1354 }
1355
1356 /* Is pw1 obviously equal to pw2?
1357  * That is, do they have obviously identical cells and obviously identical
1358  * elements on each cell?
1359  */
1360 int FN(PW,plain_is_equal)(__isl_keep PW *pw1, __isl_keep PW *pw2)
1361 {
1362         int i;
1363         int equal;
1364
1365         if (!pw1 || !pw2)
1366                 return -1;
1367
1368         if (pw1 == pw2)
1369                 return 1;
1370         if (!isl_space_is_equal(pw1->dim, pw2->dim))
1371                 return 0;
1372
1373         pw1 = FN(PW,copy)(pw1);
1374         pw2 = FN(PW,copy)(pw2);
1375         pw1 = FN(PW,normalize)(pw1);
1376         pw2 = FN(PW,normalize)(pw2);
1377         if (!pw1 || !pw2)
1378                 goto error;
1379
1380         equal = pw1->n == pw2->n;
1381         for (i = 0; equal && i < pw1->n; ++i) {
1382                 equal = isl_set_plain_is_equal(pw1->p[i].set, pw2->p[i].set);
1383                 if (equal < 0)
1384                         goto error;
1385                 if (!equal)
1386                         break;
1387                 equal = FN(EL,plain_is_equal)(pw1->p[i].FIELD, pw2->p[i].FIELD);
1388                 if (equal < 0)
1389                         goto error;
1390         }
1391
1392         FN(PW,free)(pw1);
1393         FN(PW,free)(pw2);
1394         return equal;
1395 error:
1396         FN(PW,free)(pw1);
1397         FN(PW,free)(pw2);
1398         return -1;
1399 }