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 static __isl_give PW *FN(PW,alloc_)(__isl_take isl_dim *dim, int n)
   7 {
   8         struct PW *pw;
   9
  10         if (!dim)
  11                 return NULL;
  12         isl_assert(dim->ctx, n >= 0, goto error);
  13         pw = isl_alloc(dim->ctx, struct PW,
  14                         sizeof(struct PW) + (n - 1) * sizeof(S(PW,piece)));
  15         if (!pw)
  16                 goto error;
  17
  18         pw->ref = 1;
  19         pw->size = n;
  20         pw->n = 0;
  21         pw->dim = dim;
  22         return pw;
  23 error:
  24         isl_dim_free(dim);
  25         return NULL;
  26 }
  27
  28 __isl_give PW *FN(PW,zero)(__isl_take isl_dim *dim)
  29 {
  30         return FN(PW,alloc_)(dim, 0);
  31 }
  32
  33 __isl_give PW *FN(PW,add_piece)(__isl_take PW *pw,
  34         __isl_take isl_set *set, __isl_take EL *el)
  35 {
  36         if (!pw || !set || !el)
  37                 goto error;
  38
  39         if (isl_set_fast_is_empty(set) || FN(EL,IS_ZERO)(el)) {
  40                 isl_set_free(set);
  41                 FN(EL,free)(el);
  42                 return pw;
  43         }
  44
  45         isl_assert(set->ctx, isl_dim_equal(pw->dim, el->dim), goto error);
  46         isl_assert(set->ctx, pw->n < pw->size, goto error);
  47
  48         pw->p[pw->n].set = set;
  49         pw->p[pw->n].FIELD = el;
  50         pw->n++;
  51
  52         return pw;
  53 error:
  54         FN(PW,free)(pw);
  55         isl_set_free(set);
  56         FN(EL,free)(el);
  57         return NULL;
  58 }
  59
  60 __isl_give PW *FN(PW,alloc)(__isl_take isl_set *set, __isl_take EL *el)
  61 {
  62         PW *pw;
  63
  64         if (!set || !el)
  65                 goto error;
  66
  67         pw = FN(PW,alloc_)(isl_set_get_dim(set), 1);
  68
  69         return FN(PW,add_piece)(pw, set, el);
  70 error:
  71         isl_set_free(set);
  72         FN(EL,free)(el);
  73         return NULL;
  74 }
  75
  76 __isl_give PW *FN(PW,dup)(__isl_keep PW *pw)
  77 {
  78         int i;
  79         PW *dup;
  80
  81         if (!pw)
  82                 return NULL;
  83
  84         dup = FN(PW,alloc_)(isl_dim_copy(pw->dim), pw->n);
  85         if (!dup)
  86                 return NULL;
  87
  88         for (i = 0; i < pw->n; ++i)
  89                 dup = FN(PW,add_piece)(dup, isl_set_copy(pw->p[i].set),
  90                                             FN(EL,copy)(pw->p[i].FIELD));
  91
  92         return dup;
  93 error:
  94         FN(PW,free)(dup);
  95         return NULL;
  96 }
  97
  98 __isl_give PW *FN(PW,cow)(__isl_take PW *pw)
  99 {
 100         if (!pw)
 101                 return NULL;
 102
 103         if (pw->ref == 1)
 104                 return pw;
 105         pw->ref--;
 106         return FN(PW,dup)(pw);
 107 }
 108
 109 __isl_give PW *FN(PW,copy)(__isl_keep PW *pw)
 110 {
 111         if (!pw)
 112                 return NULL;
 113
 114         pw->ref++;
 115         return pw;
 116 }
 117
 118 void FN(PW,free)(__isl_take PW *pw)
 119 {
 120         int i;
 121
 122         if (!pw)
 123                 return;
 124         if (--pw->ref > 0)
 125                 return;
 126
 127         for (i = 0; i < pw->n; ++i) {
 128                 isl_set_free(pw->p[i].set);
 129                 FN(EL,free)(pw->p[i].FIELD);
 130         }
 131         isl_dim_free(pw->dim);
 132         free(pw);
 133 }
 134
 135 int FN(PW,is_zero)(__isl_keep PW *pw)
 136 {
 137         if (!pw)
 138                 return -1;
 139
 140         return pw->n == 0;
 141 }
 142
 143 __isl_give PW *FN(PW,add)(__isl_take PW *pw1, __isl_take PW *pw2)
 144 {
 145         int i, j, n;
 146         struct PW *res;
 147         isl_set *set;
 148
 149         if (!pw1 || !pw2)
 150                 goto error;
 151
 152         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
 153
 154         if (FN(PW,is_zero)(pw1)) {
 155                 FN(PW,free)(pw1);
 156                 return pw2;
 157         }
 158
 159         if (FN(PW,is_zero)(pw2)) {
 160                 FN(PW,free)(pw2);
 161                 return pw1;
 162         }
 163
 164         n = (pw1->n + 1) * (pw2->n + 1);
 165         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), n);
 166
 167         for (i = 0; i < pw1->n; ++i) {
 168                 set = isl_set_copy(pw1->p[i].set);
 169                 for (j = 0; j < pw2->n; ++j) {
 170                         struct isl_set *common;
 171                         EL *sum;
 172                         set = isl_set_subtract(set,
 173                                         isl_set_copy(pw2->p[j].set));
 174                         common = isl_set_intersect(isl_set_copy(pw1->p[i].set),
 175                                                 isl_set_copy(pw2->p[j].set));
 176                         if (isl_set_fast_is_empty(common)) {
 177                                 isl_set_free(common);
 178                                 continue;
 179                         }
 180
 181                         sum = ADD(common, FN(EL,copy)(pw1->p[i].FIELD),
 182                                           FN(EL,copy)(pw2->p[j].FIELD));
 183
 184                         res = FN(PW,add_piece)(res, common, sum);
 185                 }
 186                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw1->p[i].FIELD));
 187         }
 188
 189         for (j = 0; j < pw2->n; ++j) {
 190                 set = isl_set_copy(pw2->p[j].set);
 191                 for (i = 0; i < pw1->n; ++i)
 192                         set = isl_set_subtract(set,
 193                                         isl_set_copy(pw1->p[i].set));
 194                 res = FN(PW,add_piece)(res, set, FN(EL,copy)(pw2->p[j].FIELD));
 195         }
 196
 197         FN(PW,free)(pw1);
 198         FN(PW,free)(pw2);
 199
 200         return res;
 201 error:
 202         FN(PW,free)(pw1);
 203         FN(PW,free)(pw2);
 204         return NULL;
 205 }
 206
 207 __isl_give PW *FN(PW,add_disjoint)(__isl_take PW *pw1, __isl_take PW *pw2)
 208 {
 209         int i;
 210         PW *res;
 211
 212         if (!pw1 || !pw2)
 213                 goto error;
 214
 215         isl_assert(pw1->dim->ctx, isl_dim_equal(pw1->dim, pw2->dim), goto error);
 216
 217         if (FN(PW,is_zero)(pw1)) {
 218                 FN(PW,free)(pw1);
 219                 return pw2;
 220         }
 221
 222         if (FN(PW,is_zero)(pw2)) {
 223                 FN(PW,free)(pw2);
 224                 return pw1;
 225         }
 226
 227         res = FN(PW,alloc_)(isl_dim_copy(pw1->dim), pw1->n + pw2->n);
 228
 229         for (i = 0; i < pw1->n; ++i)
 230                 res = FN(PW,add_piece)(res,
 231                                 isl_set_copy(pw1->p[i].set),
 232                                 FN(EL,copy)(pw1->p[i].FIELD));
 233
 234         for (i = 0; i < pw2->n; ++i)
 235                 res = FN(PW,add_piece)(res,
 236                                 isl_set_copy(pw2->p[i].set),
 237                                 FN(EL,copy)(pw2->p[i].FIELD));
 238
 239         FN(PW,free)(pw1);
 240         FN(PW,free)(pw2);
 241
 242         return res;
 243 error:
 244         FN(PW,free)(pw1);
 245         FN(PW,free)(pw2);
 246         return NULL;
 247 }
 248
 249 __isl_give isl_qpolynomial *FN(PW,eval)(__isl_take PW *pw,
 250         __isl_take isl_point *pnt)
 251 {
 252         int i;
 253         int found = 0;
 254         isl_qpolynomial *qp;
 255
 256         if (!pw || !pnt)
 257                 goto error;
 258         isl_assert(pnt->dim->ctx, isl_dim_equal(pnt->dim, pw->dim), goto error);
 259
 260         for (i = 0; i < pw->n; ++i) {
 261                 found = isl_set_contains_point(pw->p[i].set, pnt);
 262                 if (found < 0)
 263                         goto error;
 264                 if (found)
 265                         break;
 266         }
 267         if (found)
 268                 qp = FN(EL,eval)(FN(EL,copy)(pw->p[i].FIELD),
 269                                             isl_point_copy(pnt));
 270         else
 271                 qp = isl_qpolynomial_zero(isl_dim_copy(pw->dim));
 272         FN(PW,free)(pw);
 273         isl_point_free(pnt);
 274         return qp;
 275 error:
 276         FN(PW,free)(pw);
 277         isl_point_free(pnt);
 278         return NULL;
 279 }
 280
 281 __isl_give isl_set *FN(PW,domain)(__isl_take PW *pw)
 282 {
 283         int i;
 284         isl_set *dom;
 285
 286         if (!pw)
 287                 return NULL;
 288
 289         dom = isl_set_empty(isl_dim_copy(pw->dim));
 290         for (i = 0; i < pw->n; ++i)
 291                 dom = isl_set_union_disjoint(dom, isl_set_copy(pw->p[i].set));
 292
 293         FN(PW,free)(pw);
 294
 295         return dom;
 296 }
 297
 298 __isl_give PW *FN(PW,intersect_domain)(__isl_take PW *pw, __isl_take isl_set *set)
 299 {
 300         int i;
 301
 302         if (!pw || !set)
 303                 goto error;
 304
 305         if (pw->n == 0) {
 306                 isl_set_free(set);
 307                 return pw;
 308         }
 309
 310         pw = FN(PW,cow)(pw);
 311         if (!pw)
 312                 goto error;
 313
 314         for (i = 0; i < pw->n; ++i) {
 315                 pw->p[i].set = isl_set_intersect(pw->p[i].set, isl_set_copy(set));
 316                 if (!pw->p[i].set)
 317                         goto error;
 318         }
 319
 320         isl_set_free(set);
 321         return pw;
 322 error:
 323         isl_set_free(set);
 324         FN(PW,free)(pw);
 325         return NULL;
 326 }
 327
 328 __isl_give PW *FN(PW,gist)(__isl_take PW *pw, __isl_take isl_set *context)
 329 {
 330         int i;
 331         isl_basic_set *hull = NULL;
 332
 333         if (!pw || !context)
 334                 goto error;
 335
 336         if (pw->n == 0) {
 337                 isl_set_free(context);
 338                 return pw;
 339         }
 340
 341         hull = isl_set_simple_hull(isl_set_copy(context));
 342
 343         pw = FN(PW,cow)(pw);
 344         if (!pw)
 345                 goto error;
 346
 347         for (i = 0; i < pw->n; ++i) {
 348                 pw->p[i].set = isl_set_gist_basic_set(pw->p[i].set,
 349                                                 isl_basic_set_copy(hull));
 350                 if (!pw->p[i].set)
 351                         goto error;
 352         }
 353
 354         isl_basic_set_free(hull);
 355         isl_set_free(context);
 356
 357         return pw;
 358 error:
 359         FN(PW,free)(pw);
 360         isl_basic_set_free(hull);
 361         isl_set_free(context);
 362         return NULL;
 363 }
 364
 365 __isl_give PW *FN(PW,coalesce)(__isl_take PW *pw)
 366 {
 367         int i, j;
 368
 369         if (!pw)
 370                 return NULL;
 371         if (pw->n == 0)
 372                 return pw;
 373
 374         for (i = pw->n - 1; i >= 0; --i) {
 375                 for (j = i - 1; j >= 0; --j) {
 376                         if (!FN(EL,is_equal)(pw->p[i].FIELD, pw->p[j].FIELD))
 377                                 continue;
 378                         pw->p[j].set = isl_set_union(pw->p[j].set,
 379                                                         pw->p[i].set);
 380                         FN(EL,free)(pw->p[i].FIELD);
 381                         if (i != pw->n - 1)
 382                                 pw->p[i] = pw->p[pw->n - 1];
 383                         pw->n--;
 384                         break;
 385                 }
 386                 if (j >= 0)
 387                         continue;
 388                 pw->p[i].set = isl_set_coalesce(pw->p[i].set);
 389                 if (!pw->p[i].set)
 390                         goto error;
 391         }
 392
 393         return pw;
 394 error:
 395         FN(PW,free)(pw);
 396         return NULL;
 397 }
 398
 399 isl_ctx *FN(PW,get_ctx)(__isl_keep PW *pw)
 400 {
 401         return pw ? pw->dim->ctx : NULL;
 402 }
 403
 404 int FN(PW,involves_dims)(__isl_keep PW *pw, enum isl_dim_type type,
 405         unsigned first, unsigned n)
 406 {
 407         int i;
 408
 409         if (!pw)
 410                 return -1;
 411         if (pw->n == 0 || n == 0)
 412                 return 0;
 413         for (i = 0; i < pw->n; ++i) {
 414                 int involves = FN(EL,involves_dims)(pw->p[i].FIELD,
 415                                                         type, first, n);
 416                 if (involves < 0 || involves)
 417                         return involves;
 418         }
 419         return 0;
 420 }
 421
 422 __isl_give PW *FN(PW,drop_dims)(__isl_take PW *pw,
 423         enum isl_dim_type type, unsigned first, unsigned n)
 424 {
 425         int i;
 426
 427         if (!pw)
 428                 return NULL;
 429         if (n == 0 && !isl_dim_get_tuple_name(pw->dim, type))
 430                 return pw;
 431
 432         pw = FN(PW,cow)(pw);
 433         if (!pw)
 434                 return NULL;
 435         pw->dim = isl_dim_drop(pw->dim, type, first, n);
 436         if (!pw->dim)
 437                 goto error;
 438         for (i = 0; i < pw->n; ++i) {
 439                 pw->p[i].set = isl_set_drop(pw->p[i].set, type, first, n);
 440                 if (!pw->p[i].set)
 441                         goto error;
 442                 pw->p[i].FIELD = FN(EL,drop_dims)(pw->p[i].FIELD, type, first, n);
 443                 if (!pw->p[i].FIELD)
 444                         goto error;
 445         }
 446
 447         return pw;
 448 error:
 449         FN(PW,free)(pw);
 450         return NULL;
 451 }
 452
 453 __isl_give PW *FN(PW,fix_dim)(__isl_take PW *pw,
 454         enum isl_dim_type type, unsigned pos, isl_int v)
 455 {
 456         int i;
 457
 458         if (!pw)
 459                 return NULL;
 460
 461         pw = FN(PW,cow)(pw);
 462         if (!pw)
 463                 return NULL;
 464         for (i = 0; i < pw->n; ++i) {
 465                 pw->p[i].set = isl_set_fix(pw->p[i].set, type, pos, v);
 466                 if (!pw->p[i].set)
 467                         goto error;
 468         }
 469
 470         return pw;
 471 error:
 472         FN(PW,free)(pw);
 473         return NULL;
 474 }
 475
 476 unsigned FN(PW,dim)(__isl_keep PW *pw, enum isl_dim_type type)
 477 {
 478         return pw ? isl_dim_size(pw->dim, type) : 0;
 479 }
 480
 481 __isl_give PW *FN(PW,split_dims)(__isl_take PW *pw,
 482         enum isl_dim_type type, unsigned first, unsigned n)
 483 {
 484         int i;
 485
 486         if (!pw)
 487                 return NULL;
 488         if (n == 0)
 489                 return pw;
 490
 491         pw = FN(PW,cow)(pw);
 492         if (!pw)
 493                 return NULL;
 494         if (!pw->dim)
 495                 goto error;
 496         for (i = 0; i < pw->n; ++i) {
 497                 pw->p[i].set = isl_set_split_dims(pw->p[i].set, type, first, n);
 498                 if (!pw->p[i].set)
 499                         goto error;
 500         }
 501
 502         return pw;
 503 error:
 504         FN(PW,free)(pw);
 505         return NULL;
 506 }
 507
 508 /* Compute the maximal value attained by the piecewise quasipolynomial
 509  * on its domain or zero if the domain is empty.
 510  * In the worst case, the domain is scanned completely,
 511  * so the domain is assumed to be bounded.
 512  */
 513 __isl_give isl_qpolynomial *FN(PW,opt)(__isl_take PW *pw, int max)
 514 {
 515         int i;
 516         isl_qpolynomial *opt;
 517
 518         if (!pw)
 519                 return NULL;
 520
 521         if (pw->n == 0) {
 522                 isl_dim *dim = isl_dim_copy(pw->dim);
 523                 FN(PW,free)(pw);
 524                 return isl_qpolynomial_zero(dim);
 525         }
 526
 527         opt = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[0].FIELD),
 528                                         isl_set_copy(pw->p[0].set), max);
 529         for (i = 1; i < pw->n; ++i) {
 530                 isl_qpolynomial *opt_i;
 531                 opt_i = FN(EL,opt_on_domain)(FN(EL,copy)(pw->p[i].FIELD),
 532                                                 isl_set_copy(pw->p[i].set), max);
 533                 if (max)
 534                         opt = isl_qpolynomial_max_cst(opt, opt_i);
 535                 else
 536                         opt = isl_qpolynomial_min_cst(opt, opt_i);
 537         }
 538
 539         FN(PW,free)(pw);
 540         return opt;
 541 }
 542
 543 __isl_give isl_qpolynomial *FN(PW,max)(__isl_take PW *pw)
 544 {
 545         return FN(PW,opt)(pw, 1);
 546 }
 547
 548 __isl_give isl_qpolynomial *FN(PW,min)(__isl_take PW *pw)
 549 {
 550         return FN(PW,opt)(pw, 0);
 551 }
 552
 553 __isl_give isl_dim *FN(PW,get_dim)(__isl_keep PW *pw)
 554 {
 555         return pw ? isl_dim_copy(pw->dim) : NULL;
 556 }
 557
 558 __isl_give PW *FN(PW,reset_dim)(__isl_take PW *pw, __isl_take isl_dim *dim)
 559 {
 560         int i;
 561
 562         pw = FN(PW,cow)(pw);
 563         if (!pw || !dim)
 564                 goto error;
 565
 566         for (i = 0; i < pw->n; ++i) {
 567                 pw->p[i].set = isl_set_reset_dim(pw->p[i].set,
 568                                                  isl_dim_copy(dim));
 569                 if (!pw->p[i].set)
 570                         goto error;
 571                 pw->p[i].FIELD = FN(EL,reset_dim)(pw->p[i].FIELD,
 572                                                   isl_dim_copy(dim));
 573                 if (!pw->p[i].FIELD)
 574                         goto error;
 575         }
 576         isl_dim_free(pw->dim);
 577         pw->dim = dim;
 578
 579         return pw;
 580 error:
 581         isl_dim_free(dim);
 582         FN(PW,free)(pw);
 583         return NULL;
 584 }
 585
 586 int FN(PW,has_equal_dim)(__isl_keep PW *pw1, __isl_keep PW *pw2)
 587 {
 588         if (!pw1 || !pw2)
 589                 return -1;
 590
 591         return isl_dim_equal(pw1->dim, pw2->dim);
 592 }
 593
 594 __isl_give PW *FN(PW,morph)(__isl_take PW *pw, __isl_take isl_morph *morph)
 595 {
 596         int i;
 597
 598         if (!pw || !morph)
 599                 goto error;
 600
 601         isl_assert(pw->dim->ctx, isl_dim_equal(pw->dim, morph->dom->dim),
 602                 goto error);
 603
 604         pw = FN(PW,cow)(pw);
 605         if (!pw)
 606                 goto error;
 607         isl_dim_free(pw->dim);
 608         pw->dim = isl_dim_copy(morph->ran->dim);
 609         if (!pw->dim)
 610                 goto error;
 611
 612         for (i = 0; i < pw->n; ++i) {
 613                 pw->p[i].set = isl_morph_set(isl_morph_copy(morph), pw->p[i].set);
 614                 if (!pw->p[i].set)
 615                         goto error;
 616                 pw->p[i].FIELD = FN(EL,morph)(pw->p[i].FIELD,
 617                                                 isl_morph_copy(morph));
 618                 if (!pw->p[i].FIELD)
 619                         goto error;
 620         }
 621
 622         isl_morph_free(morph);
 623
 624         return pw;
 625 error:
 626         FN(PW,free)(pw);
 627         isl_morph_free(morph);
 628         return NULL;
 629 }
 630
 631 int FN(PW,foreach_piece)(__isl_keep PW *pw,
 632         int (*fn)(__isl_take isl_set *set, __isl_take EL *el, void *user),
 633         void *user)
 634 {
 635         int i;
 636
 637         if (!pw)
 638                 return -1;
 639
 640         for (i = 0; i < pw->n; ++i)
 641                 if (fn(isl_set_copy(pw->p[i].set),
 642                                 FN(EL,copy)(pw->p[i].FIELD), user) < 0)
 643                         return -1;
 644
 645         return 0;
 646 }
 647
 648 static int any_divs(__isl_keep isl_set *set)
 649 {
 650         int i;
 651
 652         if (!set)
 653                 return -1;
 654
 655         for (i = 0; i < set->n; ++i)
 656                 if (set->p[i]->n_div > 0)
 657                         return 1;
 658
 659         return 0;
 660 }
 661
 662 static int foreach_lifted_subset(__isl_take isl_set *set, __isl_take EL *el,
 663         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 664                     void *user), void *user)
 665 {
 666         int i;
 667
 668         if (!set || !el)
 669                 goto error;
 670
 671         for (i = 0; i < set->n; ++i) {
 672                 isl_set *lift;
 673                 EL *copy;
 674
 675                 lift = isl_set_from_basic_set(isl_basic_set_copy(set->p[i]));
 676                 lift = isl_set_lift(lift);
 677
 678                 copy = FN(EL,copy)(el);
 679                 copy = FN(EL,lift)(copy, isl_set_get_dim(lift));
 680
 681                 if (fn(lift, copy, user) < 0)
 682                         goto error;
 683         }
 684
 685         isl_set_free(set);
 686         FN(EL,free)(el);
 687
 688         return 0;
 689 error:
 690         isl_set_free(set);
 691         FN(EL,free)(el);
 692         return -1;
 693 }
 694
 695 int FN(PW,foreach_lifted_piece)(__isl_keep PW *pw,
 696         int (*fn)(__isl_take isl_set *set, __isl_take EL *el,
 697                     void *user), void *user)
 698 {
 699         int i;
 700
 701         if (!pw)
 702                 return -1;
 703
 704         for (i = 0; i < pw->n; ++i) {
 705                 isl_set *set;
 706                 EL *el;
 707
 708                 set = isl_set_copy(pw->p[i].set);
 709                 el = FN(EL,copy)(pw->p[i].FIELD);
 710                 if (!any_divs(set)) {
 711                         if (fn(set, el, user) < 0)
 712                                 return -1;
 713                         continue;
 714                 }
 715                 if (foreach_lifted_subset(set, el, fn, user) < 0)
 716                         return -1;
 717         }
 718
 719         return 0;
 720 }
 721
 722 __isl_give PW *FN(PW,move_dims)(__isl_take PW *pw,
 723         enum isl_dim_type dst_type, unsigned dst_pos,
 724         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 725 {
 726         int i;
 727
 728         pw = FN(PW,cow)(pw);
 729         if (!pw)
 730                 return NULL;
 731
 732         pw->dim = isl_dim_move(pw->dim, dst_type, dst_pos, src_type, src_pos, n);
 733         if (!pw->dim)
 734                 goto error;
 735
 736         for (i = 0; i < pw->n; ++i) {
 737                 pw->p[i].set = isl_set_move_dims(pw->p[i].set,
 738                                                 dst_type, dst_pos,
 739                                                 src_type, src_pos, n);
 740                 if (!pw->p[i].set)
 741                         goto error;
 742                 pw->p[i].FIELD = FN(EL,move_dims)(pw->p[i].FIELD,
 743                                         dst_type, dst_pos, src_type, src_pos, n);
 744                 if (!pw->p[i].FIELD)
 745                         goto error;
 746         }
 747
 748         return pw;
 749 error:
 750         FN(PW,free)(pw);
 751         return NULL;
 752 }