isl_dim.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  * Copyright 2010      INRIA Saclay
   4  *
   5  * Use of this software is governed by the GNU LGPLv2.1 license
   6  *
   7  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   8  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   9  * and INRIA Saclay - Ile-de-France, Parc Club Orsay Universite,
  10  * ZAC des vignes, 4 rue Jacques Monod, 91893 Orsay, France
  11  */
  12
  13 #include <stdlib.h>
  14 #include <isl_dim_private.h>
  15 #include <isl_id_private.h>
  16 #include <isl_reordering.h>
  17
  18 isl_ctx *isl_dim_get_ctx(__isl_keep isl_dim *dim)
  19 {
  20         return dim ? dim->ctx : NULL;
  21 }
  22
  23 struct isl_dim *isl_dim_alloc(struct isl_ctx *ctx,
  24                         unsigned nparam, unsigned n_in, unsigned n_out)
  25 {
  26         struct isl_dim *dim;
  27
  28         dim = isl_alloc_type(ctx, struct isl_dim);
  29         if (!dim)
  30                 return NULL;
  31
  32         dim->ctx = ctx;
  33         isl_ctx_ref(ctx);
  34         dim->ref = 1;
  35         dim->nparam = nparam;
  36         dim->n_in = n_in;
  37         dim->n_out = n_out;
  38
  39         dim->tuple_id[0] = NULL;
  40         dim->tuple_id[1] = NULL;
  41
  42         dim->nested[0] = NULL;
  43         dim->nested[1] = NULL;
  44
  45         dim->n_id = 0;
  46         dim->ids = NULL;
  47
  48         return dim;
  49 }
  50
  51 struct isl_dim *isl_dim_set_alloc(struct isl_ctx *ctx,
  52                         unsigned nparam, unsigned dim)
  53 {
  54         return isl_dim_alloc(ctx, nparam, 0, dim);
  55 }
  56
  57 static unsigned global_pos(struct isl_dim *dim,
  58                                  enum isl_dim_type type, unsigned pos)
  59 {
  60         struct isl_ctx *ctx = dim->ctx;
  61
  62         switch (type) {
  63         case isl_dim_param:
  64                 isl_assert(ctx, pos < dim->nparam, return isl_dim_total(dim));
  65                 return pos;
  66         case isl_dim_in:
  67                 isl_assert(ctx, pos < dim->n_in, return isl_dim_total(dim));
  68                 return pos + dim->nparam;
  69         case isl_dim_out:
  70                 isl_assert(ctx, pos < dim->n_out, return isl_dim_total(dim));
  71                 return pos + dim->nparam + dim->n_in;
  72         default:
  73                 isl_assert(ctx, 0, return isl_dim_total(dim));
  74         }
  75         return isl_dim_total(dim);
  76 }
  77
  78 /* Extend length of ids array to the total number of dimensions.
  79  */
  80 static __isl_give isl_dim *extend_ids(__isl_take isl_dim *dim)
  81 {
  82         isl_id **ids;
  83         int i;
  84
  85         if (isl_dim_total(dim) <= dim->n_id)
  86                 return dim;
  87
  88         if (!dim->ids) {
  89                 dim->ids = isl_calloc_array(dim->ctx,
  90                                 isl_id *, isl_dim_total(dim));
  91                 if (!dim->ids)
  92                         goto error;
  93         } else {
  94                 ids = isl_realloc_array(dim->ctx, dim->ids,
  95                                 isl_id *, isl_dim_total(dim));
  96                 if (!ids)
  97                         goto error;
  98                 dim->ids = ids;
  99                 for (i = dim->n_id; i < isl_dim_total(dim); ++i)
 100                         dim->ids[i] = NULL;
 101         }
 102
 103         dim->n_id = isl_dim_total(dim);
 104
 105         return dim;
 106 error:
 107         isl_dim_free(dim);
 108         return NULL;
 109 }
 110
 111 static __isl_give isl_dim *set_id(__isl_take isl_dim *dim,
 112         enum isl_dim_type type, unsigned pos, __isl_take isl_id *id)
 113 {
 114         dim = isl_dim_cow(dim);
 115
 116         if (!dim)
 117                 goto error;
 118
 119         pos = global_pos(dim, type, pos);
 120         if (pos == isl_dim_total(dim))
 121                 goto error;
 122
 123         if (pos >= dim->n_id) {
 124                 if (!id)
 125                         return dim;
 126                 dim = extend_ids(dim);
 127                 if (!dim)
 128                         goto error;
 129         }
 130
 131         dim->ids[pos] = id;
 132
 133         return dim;
 134 error:
 135         isl_id_free(id);
 136         isl_dim_free(dim);
 137         return NULL;
 138 }
 139
 140 static __isl_keep isl_id *get_id(__isl_keep isl_dim *dim,
 141                                  enum isl_dim_type type, unsigned pos)
 142 {
 143         if (!dim)
 144                 return NULL;
 145
 146         pos = global_pos(dim, type, pos);
 147         if (pos == isl_dim_total(dim))
 148                 return NULL;
 149         if (pos >= dim->n_id)
 150                 return NULL;
 151         return dim->ids[pos];
 152 }
 153
 154 static unsigned offset(struct isl_dim *dim, enum isl_dim_type type)
 155 {
 156         switch (type) {
 157         case isl_dim_param:     return 0;
 158         case isl_dim_in:        return dim->nparam;
 159         case isl_dim_out:       return dim->nparam + dim->n_in;
 160         default:                return 0;
 161         }
 162 }
 163
 164 static unsigned n(struct isl_dim *dim, enum isl_dim_type type)
 165 {
 166         switch (type) {
 167         case isl_dim_param:     return dim->nparam;
 168         case isl_dim_in:        return dim->n_in;
 169         case isl_dim_out:       return dim->n_out;
 170         case isl_dim_all:       return dim->nparam + dim->n_in + dim->n_out;
 171         default:                return 0;
 172         }
 173 }
 174
 175 unsigned isl_dim_size(struct isl_dim *dim, enum isl_dim_type type)
 176 {
 177         if (!dim)
 178                 return 0;
 179         return n(dim, type);
 180 }
 181
 182 unsigned isl_dim_offset(__isl_keep isl_dim *dim, enum isl_dim_type type)
 183 {
 184         if (!dim)
 185                 return 0;
 186         return offset(dim, type);
 187 }
 188
 189 static __isl_give isl_dim *copy_ids(__isl_take isl_dim *dst,
 190         enum isl_dim_type dst_type, unsigned offset, __isl_keep isl_dim *src,
 191         enum isl_dim_type src_type)
 192 {
 193         int i;
 194         isl_id *id;
 195
 196         if (!dst)
 197                 return NULL;
 198
 199         for (i = 0; i < n(src, src_type); ++i) {
 200                 id = get_id(src, src_type, i);
 201                 if (!id)
 202                         continue;
 203                 dst = set_id(dst, dst_type, offset + i, isl_id_copy(id));
 204                 if (!dst)
 205                         return NULL;
 206         }
 207         return dst;
 208 }
 209
 210 struct isl_dim *isl_dim_dup(struct isl_dim *dim)
 211 {
 212         struct isl_dim *dup;
 213         if (!dim)
 214                 return NULL;
 215         dup = isl_dim_alloc(dim->ctx, dim->nparam, dim->n_in, dim->n_out);
 216         if (dim->tuple_id[0] &&
 217             !(dup->tuple_id[0] = isl_id_copy(dim->tuple_id[0])))
 218                 goto error;
 219         if (dim->tuple_id[1] &&
 220             !(dup->tuple_id[1] = isl_id_copy(dim->tuple_id[1])))
 221                 goto error;
 222         if (dim->nested[0] && !(dup->nested[0] = isl_dim_copy(dim->nested[0])))
 223                 goto error;
 224         if (dim->nested[1] && !(dup->nested[1] = isl_dim_copy(dim->nested[1])))
 225                 goto error;
 226         if (!dim->ids)
 227                 return dup;
 228         dup = copy_ids(dup, isl_dim_param, 0, dim, isl_dim_param);
 229         dup = copy_ids(dup, isl_dim_in, 0, dim, isl_dim_in);
 230         dup = copy_ids(dup, isl_dim_out, 0, dim, isl_dim_out);
 231         return dup;
 232 error:
 233         isl_dim_free(dup);
 234         return NULL;
 235 }
 236
 237 struct isl_dim *isl_dim_cow(struct isl_dim *dim)
 238 {
 239         if (!dim)
 240                 return NULL;
 241
 242         if (dim->ref == 1)
 243                 return dim;
 244         dim->ref--;
 245         return isl_dim_dup(dim);
 246 }
 247
 248 struct isl_dim *isl_dim_copy(struct isl_dim *dim)
 249 {
 250         if (!dim)
 251                 return NULL;
 252
 253         dim->ref++;
 254         return dim;
 255 }
 256
 257 void isl_dim_free(struct isl_dim *dim)
 258 {
 259         int i;
 260
 261         if (!dim)
 262                 return;
 263
 264         if (--dim->ref > 0)
 265                 return;
 266
 267         isl_id_free(dim->tuple_id[0]);
 268         isl_id_free(dim->tuple_id[1]);
 269
 270         isl_dim_free(dim->nested[0]);
 271         isl_dim_free(dim->nested[1]);
 272
 273         for (i = 0; i < dim->n_id; ++i)
 274                 isl_id_free(dim->ids[i]);
 275         free(dim->ids);
 276         isl_ctx_deref(dim->ctx);
 277
 278         free(dim);
 279 }
 280
 281 static int name_ok(isl_ctx *ctx, const char *s)
 282 {
 283         char *p;
 284         long dummy;
 285
 286         dummy = strtol(s, &p, 0);
 287         if (p != s)
 288                 isl_die(ctx, isl_error_invalid, "name looks like a number",
 289                         return 0);
 290
 291         return 1;
 292 }
 293
 294 int isl_dim_has_tuple_id(__isl_keep isl_dim *dim, enum isl_dim_type type)
 295 {
 296         if (!dim)
 297                 return -1;
 298         if (type != isl_dim_in && type != isl_dim_out)
 299                 isl_die(dim->ctx, isl_error_invalid,
 300                         "only input, output and set tuples can have ids",
 301                         return -1);
 302         return dim->tuple_id[type - isl_dim_in] != NULL;
 303 }
 304
 305 __isl_give isl_id *isl_dim_get_tuple_id(__isl_keep isl_dim *dim,
 306         enum isl_dim_type type)
 307 {
 308         if (!dim)
 309                 return NULL;
 310         if (type != isl_dim_in && type != isl_dim_out)
 311                 return NULL;
 312         return isl_id_copy(dim->tuple_id[type - isl_dim_in]);
 313 }
 314
 315 __isl_give isl_dim *isl_dim_set_tuple_id(__isl_take isl_dim *dim,
 316         enum isl_dim_type type, __isl_take isl_id *id)
 317 {
 318         dim = isl_dim_cow(dim);
 319         if (!dim || !id)
 320                 goto error;
 321         if (type != isl_dim_in && type != isl_dim_out)
 322                 isl_die(dim->ctx, isl_error_invalid,
 323                         "only input, output and set tuples can have names",
 324                         goto error);
 325
 326         isl_id_free(dim->tuple_id[type - isl_dim_in]);
 327         dim->tuple_id[type - isl_dim_in] = id;
 328
 329         return dim;
 330 error:
 331         isl_id_free(id);
 332         isl_dim_free(dim);
 333         return NULL;
 334 }
 335
 336 __isl_give isl_dim *isl_dim_reset_tuple_id(__isl_take isl_dim *dim,
 337         enum isl_dim_type type)
 338 {
 339         dim = isl_dim_cow(dim);
 340         if (!dim)
 341                 return NULL;
 342         if (type != isl_dim_in && type != isl_dim_out)
 343                 isl_die(dim->ctx, isl_error_invalid,
 344                         "only input, output and set tuples can have names",
 345                         goto error);
 346
 347         isl_id_free(dim->tuple_id[type - isl_dim_in]);
 348         dim->tuple_id[type - isl_dim_in] = NULL;
 349
 350         return dim;
 351 error:
 352         isl_dim_free(dim);
 353         return NULL;
 354 }
 355
 356 __isl_give isl_dim *isl_dim_set_dim_id(__isl_take isl_dim *dim,
 357         enum isl_dim_type type, unsigned pos, __isl_take isl_id *id)
 358 {
 359         dim = isl_dim_cow(dim);
 360         if (!dim || !id)
 361                 goto error;
 362         isl_id_free(get_id(dim, type, pos));
 363         return set_id(dim, type, pos, id);
 364 error:
 365         isl_id_free(id);
 366         isl_dim_free(dim);
 367         return NULL;
 368 }
 369
 370 int isl_dim_has_dim_id(__isl_keep isl_dim *dim,
 371         enum isl_dim_type type, unsigned pos)
 372 {
 373         if (!dim)
 374                 return -1;
 375         return get_id(dim, type, pos) != NULL;
 376 }
 377
 378 __isl_give isl_id *isl_dim_get_dim_id(__isl_keep isl_dim *dim,
 379         enum isl_dim_type type, unsigned pos)
 380 {
 381         if (!dim)
 382                 return NULL;
 383         if (!get_id(dim, type, pos))
 384                 isl_die(dim->ctx, isl_error_invalid,
 385                         "dim has no id", return NULL);
 386         return isl_id_copy(get_id(dim, type, pos));
 387 }
 388
 389 __isl_give isl_dim *isl_dim_set_tuple_name(__isl_take isl_dim *dim,
 390         enum isl_dim_type type, const char *s)
 391 {
 392         isl_id *id;
 393
 394         if (!dim)
 395                 return NULL;
 396
 397         if (!s)
 398                 return isl_dim_reset_tuple_id(dim, type);
 399
 400         if (!name_ok(dim->ctx, s))
 401                 goto error;
 402
 403         id = isl_id_alloc(dim->ctx, s, NULL);
 404         return isl_dim_set_tuple_id(dim, type, id);
 405 error:
 406         isl_dim_free(dim);
 407         return NULL;
 408 }
 409
 410 const char *isl_dim_get_tuple_name(__isl_keep isl_dim *dim,
 411          enum isl_dim_type type)
 412 {
 413         isl_id *id;
 414         if (!dim)
 415                 return NULL;
 416         if (type != isl_dim_in && type != isl_dim_out)
 417                 return NULL;
 418         id = dim->tuple_id[type - isl_dim_in];
 419         return id ? id->name : NULL;
 420 }
 421
 422 struct isl_dim *isl_dim_set_name(struct isl_dim *dim,
 423                                  enum isl_dim_type type, unsigned pos,
 424                                  const char *s)
 425 {
 426         isl_id *id;
 427
 428         if (!dim)
 429                 return NULL;
 430         if (!name_ok(dim->ctx, s))
 431                 goto error;
 432         id = isl_id_alloc(dim->ctx, s, NULL);
 433         return isl_dim_set_dim_id(dim, type, pos, id);
 434 error:
 435         isl_dim_free(dim);
 436         return NULL;
 437 }
 438
 439 const char *isl_dim_get_name(struct isl_dim *dim,
 440                                  enum isl_dim_type type, unsigned pos)
 441 {
 442         isl_id *id = get_id(dim, type, pos);
 443         return id ? id->name : NULL;
 444 }
 445
 446 int isl_dim_find_dim_by_id(__isl_keep isl_dim *dim, enum isl_dim_type type,
 447         __isl_keep isl_id *id)
 448 {
 449         int i;
 450         int offset;
 451         int n;
 452
 453         if (!dim || !id)
 454                 return -1;
 455
 456         offset = isl_dim_offset(dim, type);
 457         n = isl_dim_size(dim, type);
 458         for (i = 0; i < n && offset + i < dim->n_id; ++i)
 459                 if (dim->ids[offset + i] == id)
 460                         return i;
 461
 462         return -1;
 463 }
 464
 465 static __isl_keep isl_id *tuple_id(__isl_keep isl_dim *dim,
 466         enum isl_dim_type type)
 467 {
 468         if (!dim)
 469                 return NULL;
 470         if (type == isl_dim_in)
 471                 return dim->tuple_id[0];
 472         if (type == isl_dim_out)
 473                 return dim->tuple_id[1];
 474         return NULL;
 475 }
 476
 477 static __isl_keep isl_dim *nested(__isl_keep isl_dim *dim,
 478         enum isl_dim_type type)
 479 {
 480         if (!dim)
 481                 return NULL;
 482         if (type == isl_dim_in)
 483                 return dim->nested[0];
 484         if (type == isl_dim_out)
 485                 return dim->nested[1];
 486         return NULL;
 487 }
 488
 489 int isl_dim_tuple_match(__isl_keep isl_dim *dim1, enum isl_dim_type dim1_type,
 490                         __isl_keep isl_dim *dim2, enum isl_dim_type dim2_type)
 491 {
 492         isl_id *id1, *id2;
 493         isl_dim *nested1, *nested2;
 494
 495         if (!dim1 || !dim2)
 496                 return -1;
 497
 498         if (n(dim1, dim1_type) != n(dim2, dim2_type))
 499                 return 0;
 500         id1 = tuple_id(dim1, dim1_type);
 501         id2 = tuple_id(dim2, dim2_type);
 502         if (!id1 ^ !id2)
 503                 return 0;
 504         if (id1 && id1 != id2)
 505                 return 0;
 506         nested1 = nested(dim1, dim1_type);
 507         nested2 = nested(dim2, dim2_type);
 508         if (!nested1 ^ !nested2)
 509                 return 0;
 510         if (nested1 && !isl_dim_equal(nested1, nested2))
 511                 return 0;
 512         return 1;
 513 }
 514
 515 static int match(struct isl_dim *dim1, enum isl_dim_type dim1_type,
 516                 struct isl_dim *dim2, enum isl_dim_type dim2_type)
 517 {
 518         int i;
 519
 520         if (!isl_dim_tuple_match(dim1, dim1_type, dim2, dim2_type))
 521                 return 0;
 522
 523         if (!dim1->ids && !dim2->ids)
 524                 return 1;
 525
 526         for (i = 0; i < n(dim1, dim1_type); ++i) {
 527                 if (get_id(dim1, dim1_type, i) != get_id(dim2, dim2_type, i))
 528                         return 0;
 529         }
 530         return 1;
 531 }
 532
 533 int isl_dim_match(struct isl_dim *dim1, enum isl_dim_type dim1_type,
 534                 struct isl_dim *dim2, enum isl_dim_type dim2_type)
 535 {
 536         return match(dim1, dim1_type, dim2, dim2_type);
 537 }
 538
 539 static void get_ids(struct isl_dim *dim, enum isl_dim_type type,
 540         unsigned first, unsigned n, __isl_keep isl_id **ids)
 541 {
 542         int i;
 543
 544         for (i = 0; i < n ; ++i)
 545                 ids[i] = get_id(dim, type, first + i);
 546 }
 547
 548 struct isl_dim *isl_dim_extend(struct isl_dim *dim,
 549                         unsigned nparam, unsigned n_in, unsigned n_out)
 550 {
 551         isl_id **ids = NULL;
 552
 553         if (!dim)
 554                 return NULL;
 555         if (dim->nparam == nparam && dim->n_in == n_in && dim->n_out == n_out)
 556                 return dim;
 557
 558         isl_assert(dim->ctx, dim->nparam <= nparam, goto error);
 559         isl_assert(dim->ctx, dim->n_in <= n_in, goto error);
 560         isl_assert(dim->ctx, dim->n_out <= n_out, goto error);
 561
 562         dim = isl_dim_cow(dim);
 563
 564         if (dim->ids) {
 565                 ids = isl_calloc_array(dim->ctx, isl_id *,
 566                                          nparam + n_in + n_out);
 567                 if (!ids)
 568                         goto error;
 569                 get_ids(dim, isl_dim_param, 0, dim->nparam, ids);
 570                 get_ids(dim, isl_dim_in, 0, dim->n_in, ids + nparam);
 571                 get_ids(dim, isl_dim_out, 0, dim->n_out, ids + nparam + n_in);
 572                 free(dim->ids);
 573                 dim->ids = ids;
 574                 dim->n_id = nparam + n_in + n_out;
 575         }
 576         dim->nparam = nparam;
 577         dim->n_in = n_in;
 578         dim->n_out = n_out;
 579
 580         return dim;
 581 error:
 582         free(ids);
 583         isl_dim_free(dim);
 584         return NULL;
 585 }
 586
 587 struct isl_dim *isl_dim_add(struct isl_dim *dim, enum isl_dim_type type,
 588         unsigned n)
 589 {
 590         if (!dim)
 591                 return NULL;
 592         dim = isl_dim_reset(dim, type);
 593         switch (type) {
 594         case isl_dim_param:
 595                 dim = isl_dim_extend(dim,
 596                                         dim->nparam + n, dim->n_in, dim->n_out);
 597                 if (dim && dim->nested[0] &&
 598                     !(dim->nested[0] = isl_dim_add(dim->nested[0],
 599                                                     isl_dim_param, n)))
 600                         goto error;
 601                 if (dim && dim->nested[1] &&
 602                     !(dim->nested[1] = isl_dim_add(dim->nested[1],
 603                                                     isl_dim_param, n)))
 604                         goto error;
 605                 return dim;
 606         case isl_dim_in:
 607                 return isl_dim_extend(dim,
 608                                         dim->nparam, dim->n_in + n, dim->n_out);
 609         case isl_dim_out:
 610                 return isl_dim_extend(dim,
 611                                         dim->nparam, dim->n_in, dim->n_out + n);
 612         default:
 613                 isl_die(dim->ctx, isl_error_invalid,
 614                         "cannot add dimensions of specified type", goto error);
 615         }
 616 error:
 617         isl_dim_free(dim);
 618         return NULL;
 619 }
 620
 621 static int valid_dim_type(enum isl_dim_type type)
 622 {
 623         switch (type) {
 624         case isl_dim_param:
 625         case isl_dim_in:
 626         case isl_dim_out:
 627                 return 1;
 628         default:
 629                 return 0;
 630         }
 631 }
 632
 633 __isl_give isl_dim *isl_dim_insert(__isl_take isl_dim *dim,
 634         enum isl_dim_type type, unsigned pos, unsigned n)
 635 {
 636         isl_id **ids = NULL;
 637
 638         if (!dim)
 639                 return NULL;
 640         if (n == 0)
 641                 return isl_dim_reset(dim, type);
 642
 643         if (!valid_dim_type(type))
 644                 isl_die(dim->ctx, isl_error_invalid,
 645                         "cannot insert dimensions of specified type",
 646                         goto error);
 647
 648         isl_assert(dim->ctx, pos <= isl_dim_size(dim, type), goto error);
 649
 650         dim = isl_dim_cow(dim);
 651         if (!dim)
 652                 return NULL;
 653
 654         if (dim->ids) {
 655                 enum isl_dim_type t;
 656                 int off;
 657                 int s[3];
 658                 int *size = s - isl_dim_param;
 659                 ids = isl_calloc_array(dim->ctx, isl_id *,
 660                                      dim->nparam + dim->n_in + dim->n_out + n);
 661                 if (!ids)
 662                         goto error;
 663                 off = 0;
 664                 size[isl_dim_param] = dim->nparam;
 665                 size[isl_dim_in] = dim->n_in;
 666                 size[isl_dim_out] = dim->n_out;
 667                 for (t = isl_dim_param; t <= isl_dim_out; ++t) {
 668                         if (t != type) {
 669                                 get_ids(dim, t, 0, size[t], ids + off);
 670                                 off += size[t];
 671                         } else {
 672                                 get_ids(dim, t, 0, pos, ids + off);
 673                                 off += pos + n;
 674                                 get_ids(dim, t, pos, size[t] - pos, ids + off);
 675                                 off += size[t] - pos;
 676                         }
 677                 }
 678                 free(dim->ids);
 679                 dim->ids = ids;
 680                 dim->n_id = dim->nparam + dim->n_in + dim->n_out + n;
 681         }
 682         switch (type) {
 683         case isl_dim_param:     dim->nparam += n; break;
 684         case isl_dim_in:        dim->n_in += n; break;
 685         case isl_dim_out:       dim->n_out += n; break;
 686         default:                ;
 687         }
 688         dim = isl_dim_reset(dim, type);
 689
 690         return dim;
 691 error:
 692         isl_dim_free(dim);
 693         return NULL;
 694 }
 695
 696 __isl_give isl_dim *isl_dim_move(__isl_take isl_dim *dim,
 697         enum isl_dim_type dst_type, unsigned dst_pos,
 698         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 699 {
 700         int i;
 701
 702         if (!dim)
 703                 return NULL;
 704         if (n == 0)
 705                 return dim;
 706
 707         isl_assert(dim->ctx, src_pos + n <= isl_dim_size(dim, src_type),
 708                 goto error);
 709
 710         if (dst_type == src_type && dst_pos == src_pos)
 711                 return dim;
 712
 713         isl_assert(dim->ctx, dst_type != src_type, goto error);
 714
 715         dim = isl_dim_reset(dim, src_type);
 716         dim = isl_dim_reset(dim, dst_type);
 717
 718         dim = isl_dim_cow(dim);
 719         if (!dim)
 720                 return NULL;
 721
 722         if (dim->ids) {
 723                 isl_id **ids;
 724                 enum isl_dim_type t;
 725                 int off;
 726                 int s[3];
 727                 int *size = s - isl_dim_param;
 728                 ids = isl_calloc_array(dim->ctx, isl_id *,
 729                                          dim->nparam + dim->n_in + dim->n_out);
 730                 if (!ids)
 731                         goto error;
 732                 off = 0;
 733                 size[isl_dim_param] = dim->nparam;
 734                 size[isl_dim_in] = dim->n_in;
 735                 size[isl_dim_out] = dim->n_out;
 736                 for (t = isl_dim_param; t <= isl_dim_out; ++t) {
 737                         if (t == dst_type) {
 738                                 get_ids(dim, t, 0, dst_pos, ids + off);
 739                                 off += dst_pos;
 740                                 get_ids(dim, src_type, src_pos, n, ids + off);
 741                                 off += n;
 742                                 get_ids(dim, t, dst_pos, size[t] - dst_pos,
 743                                                 ids + off);
 744                                 off += size[t] - dst_pos;
 745                         } else if (t == src_type) {
 746                                 get_ids(dim, t, 0, src_pos, ids + off);
 747                                 off += src_pos;
 748                                 get_ids(dim, t, src_pos + n,
 749                                             size[t] - src_pos - n, ids + off);
 750                                 off += size[t] - src_pos - n;
 751                         } else {
 752                                 get_ids(dim, t, 0, size[t], ids + off);
 753                                 off += size[t];
 754                         }
 755                 }
 756                 free(dim->ids);
 757                 dim->ids = ids;
 758                 dim->n_id = dim->nparam + dim->n_in + dim->n_out;
 759         }
 760
 761         switch (dst_type) {
 762         case isl_dim_param:     dim->nparam += n; break;
 763         case isl_dim_in:        dim->n_in += n; break;
 764         case isl_dim_out:       dim->n_out += n; break;
 765         default:                ;
 766         }
 767
 768         switch (src_type) {
 769         case isl_dim_param:     dim->nparam -= n; break;
 770         case isl_dim_in:        dim->n_in -= n; break;
 771         case isl_dim_out:       dim->n_out -= n; break;
 772         default:                ;
 773         }
 774
 775         if (dst_type != isl_dim_param && src_type != isl_dim_param)
 776                 return dim;
 777
 778         for (i = 0; i < 2; ++i) {
 779                 if (!dim->nested[i])
 780                         continue;
 781                 dim->nested[i] = isl_dim_replace(dim->nested[i],
 782                                                  isl_dim_param, dim);
 783                 if (!dim->nested[i])
 784                         goto error;
 785         }
 786
 787         return dim;
 788 error:
 789         isl_dim_free(dim);
 790         return NULL;
 791 }
 792
 793 struct isl_dim *isl_dim_join(struct isl_dim *left, struct isl_dim *right)
 794 {
 795         struct isl_dim *dim;
 796
 797         if (!left || !right)
 798                 goto error;
 799
 800         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 801                         goto error);
 802         isl_assert(left->ctx,
 803                 isl_dim_tuple_match(left, isl_dim_out, right, isl_dim_in),
 804                 goto error);
 805
 806         dim = isl_dim_alloc(left->ctx, left->nparam, left->n_in, right->n_out);
 807         if (!dim)
 808                 goto error;
 809
 810         dim = copy_ids(dim, isl_dim_param, 0, left, isl_dim_param);
 811         dim = copy_ids(dim, isl_dim_in, 0, left, isl_dim_in);
 812         dim = copy_ids(dim, isl_dim_out, 0, right, isl_dim_out);
 813
 814         if (dim && left->tuple_id[0] &&
 815             !(dim->tuple_id[0] = isl_id_copy(left->tuple_id[0])))
 816                 goto error;
 817         if (dim && right->tuple_id[1] &&
 818             !(dim->tuple_id[1] = isl_id_copy(right->tuple_id[1])))
 819                 goto error;
 820         if (dim && left->nested[0] &&
 821             !(dim->nested[0] = isl_dim_copy(left->nested[0])))
 822                 goto error;
 823         if (dim && right->nested[1] &&
 824             !(dim->nested[1] = isl_dim_copy(right->nested[1])))
 825                 goto error;
 826
 827         isl_dim_free(left);
 828         isl_dim_free(right);
 829
 830         return dim;
 831 error:
 832         isl_dim_free(left);
 833         isl_dim_free(right);
 834         return NULL;
 835 }
 836
 837 struct isl_dim *isl_dim_product(struct isl_dim *left, struct isl_dim *right)
 838 {
 839         isl_dim *dom1, *dom2, *nest1, *nest2;
 840
 841         if (!left || !right)
 842                 goto error;
 843
 844         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 845                         goto error);
 846
 847         dom1 = isl_dim_domain(isl_dim_copy(left));
 848         dom2 = isl_dim_domain(isl_dim_copy(right));
 849         nest1 = isl_dim_wrap(isl_dim_join(isl_dim_reverse(dom1), dom2));
 850
 851         dom1 = isl_dim_range(left);
 852         dom2 = isl_dim_range(right);
 853         nest2 = isl_dim_wrap(isl_dim_join(isl_dim_reverse(dom1), dom2));
 854
 855         return isl_dim_join(isl_dim_reverse(nest1), nest2);
 856 error:
 857         isl_dim_free(left);
 858         isl_dim_free(right);
 859         return NULL;
 860 }
 861
 862 __isl_give isl_dim *isl_dim_range_product(__isl_take isl_dim *left,
 863         __isl_take isl_dim *right)
 864 {
 865         isl_dim *dom, *ran1, *ran2, *nest;
 866
 867         if (!left || !right)
 868                 goto error;
 869
 870         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 871                         goto error);
 872         if (!isl_dim_tuple_match(left, isl_dim_in, right, isl_dim_in))
 873                 isl_die(left->ctx, isl_error_invalid,
 874                         "domains need to match", goto error);
 875
 876         dom = isl_dim_domain(isl_dim_copy(left));
 877
 878         ran1 = isl_dim_range(left);
 879         ran2 = isl_dim_range(right);
 880         nest = isl_dim_wrap(isl_dim_join(isl_dim_reverse(ran1), ran2));
 881
 882         return isl_dim_join(isl_dim_reverse(dom), nest);
 883 error:
 884         isl_dim_free(left);
 885         isl_dim_free(right);
 886         return NULL;
 887 }
 888
 889 __isl_give isl_dim *isl_dim_map_from_set(__isl_take isl_dim *dim)
 890 {
 891         isl_id **ids = NULL;
 892
 893         if (!dim)
 894                 return NULL;
 895         isl_assert(dim->ctx, dim->n_in == 0, goto error);
 896         if (dim->n_out == 0 && !isl_dim_is_named_or_nested(dim, isl_dim_out))
 897                 return dim;
 898         dim = isl_dim_cow(dim);
 899         if (!dim)
 900                 return NULL;
 901         if (dim->ids) {
 902                 ids = isl_calloc_array(dim->ctx, isl_id *,
 903                                         dim->nparam + dim->n_out + dim->n_out);
 904                 if (!ids)
 905                         goto error;
 906                 get_ids(dim, isl_dim_param, 0, dim->nparam, ids);
 907                 get_ids(dim, isl_dim_out, 0, dim->n_out, ids + dim->nparam);
 908         }
 909         dim->n_in = dim->n_out;
 910         if (ids) {
 911                 free(dim->ids);
 912                 dim->ids = ids;
 913                 dim->n_id = dim->nparam + dim->n_out + dim->n_out;
 914                 dim = copy_ids(dim, isl_dim_out, 0, dim, isl_dim_in);
 915         }
 916         isl_id_free(dim->tuple_id[0]);
 917         dim->tuple_id[0] = isl_id_copy(dim->tuple_id[1]);
 918         isl_dim_free(dim->nested[0]);
 919         dim->nested[0] = isl_dim_copy(dim->nested[1]);
 920         return dim;
 921 error:
 922         isl_dim_free(dim);
 923         return NULL;
 924 }
 925
 926 static __isl_give isl_dim *set_ids(struct isl_dim *dim, enum isl_dim_type type,
 927         unsigned first, unsigned n, __isl_take isl_id **ids)
 928 {
 929         int i;
 930
 931         for (i = 0; i < n ; ++i)
 932                 dim = set_id(dim, type, first + i, ids[i]);
 933
 934         return dim;
 935 }
 936
 937 struct isl_dim *isl_dim_reverse(struct isl_dim *dim)
 938 {
 939         unsigned t;
 940         isl_dim *nested;
 941         isl_id **ids = NULL;
 942         isl_id *id;
 943
 944         if (!dim)
 945                 return NULL;
 946         if (match(dim, isl_dim_in, dim, isl_dim_out))
 947                 return dim;
 948
 949         dim = isl_dim_cow(dim);
 950         if (!dim)
 951                 return NULL;
 952
 953         id = dim->tuple_id[0];
 954         dim->tuple_id[0] = dim->tuple_id[1];
 955         dim->tuple_id[1] = id;
 956
 957         nested = dim->nested[0];
 958         dim->nested[0] = dim->nested[1];
 959         dim->nested[1] = nested;
 960
 961         if (dim->ids) {
 962                 ids = isl_alloc_array(dim->ctx, isl_id *,
 963                                         dim->n_in + dim->n_out);
 964                 if (!ids)
 965                         goto error;
 966                 get_ids(dim, isl_dim_in, 0, dim->n_in, ids);
 967                 get_ids(dim, isl_dim_out, 0, dim->n_out, ids + dim->n_in);
 968         }
 969
 970         t = dim->n_in;
 971         dim->n_in = dim->n_out;
 972         dim->n_out = t;
 973
 974         if (dim->ids) {
 975                 dim = set_ids(dim, isl_dim_out, 0, dim->n_out, ids);
 976                 dim = set_ids(dim, isl_dim_in, 0, dim->n_in, ids + dim->n_out);
 977                 free(ids);
 978         }
 979
 980         return dim;
 981 error:
 982         free(ids);
 983         isl_dim_free(dim);
 984         return NULL;
 985 }
 986
 987 struct isl_dim *isl_dim_drop(struct isl_dim *dim, enum isl_dim_type type,
 988                 unsigned first, unsigned num)
 989 {
 990         int i;
 991
 992         if (!dim)
 993                 return NULL;
 994
 995         if (num == 0)
 996                 return isl_dim_reset(dim, type);
 997
 998         if (!valid_dim_type(type))
 999                 isl_die(dim->ctx, isl_error_invalid,
1000                         "cannot drop dimensions of specified type", goto error);
1001
1002         isl_assert(dim->ctx, first + num <= n(dim, type), goto error);
1003         dim = isl_dim_cow(dim);
1004         if (!dim)
1005                 goto error;
1006         if (dim->ids) {
1007                 dim = extend_ids(dim);
1008                 if (!dim)
1009                         goto error;
1010                 for (i = 0; i < num; ++i)
1011                         isl_id_free(get_id(dim, type, first + i));
1012                 for (i = first+num; i < n(dim, type); ++i)
1013                         set_id(dim, type, i - num, get_id(dim, type, i));
1014                 switch (type) {
1015                 case isl_dim_param:
1016                         get_ids(dim, isl_dim_in, 0, dim->n_in,
1017                                 dim->ids + offset(dim, isl_dim_in) - num);
1018                 case isl_dim_in:
1019                         get_ids(dim, isl_dim_out, 0, dim->n_out,
1020                                 dim->ids + offset(dim, isl_dim_out) - num);
1021                 default:
1022                         ;
1023                 }
1024                 dim->n_id -= num;
1025         }
1026         switch (type) {
1027         case isl_dim_param:     dim->nparam -= num; break;
1028         case isl_dim_in:        dim->n_in -= num; break;
1029         case isl_dim_out:       dim->n_out -= num; break;
1030         default:                ;
1031         }
1032         dim = isl_dim_reset(dim, type);
1033         if (type == isl_dim_param) {
1034                 if (dim && dim->nested[0] &&
1035                     !(dim->nested[0] = isl_dim_drop(dim->nested[0],
1036                                                     isl_dim_param, first, num)))
1037                         goto error;
1038                 if (dim && dim->nested[1] &&
1039                     !(dim->nested[1] = isl_dim_drop(dim->nested[1],
1040                                                     isl_dim_param, first, num)))
1041                         goto error;
1042         }
1043         return dim;
1044 error:
1045         isl_dim_free(dim);
1046         return NULL;
1047 }
1048
1049 struct isl_dim *isl_dim_drop_inputs(struct isl_dim *dim,
1050                 unsigned first, unsigned n)
1051 {
1052         if (!dim)
1053                 return NULL;
1054         return isl_dim_drop(dim, isl_dim_in, first, n);
1055 }
1056
1057 struct isl_dim *isl_dim_drop_outputs(struct isl_dim *dim,
1058                 unsigned first, unsigned n)
1059 {
1060         if (!dim)
1061                 return NULL;
1062         return isl_dim_drop(dim, isl_dim_out, first, n);
1063 }
1064
1065 struct isl_dim *isl_dim_domain(struct isl_dim *dim)
1066 {
1067         if (!dim)
1068                 return NULL;
1069         dim = isl_dim_drop_outputs(dim, 0, dim->n_out);
1070         return isl_dim_reverse(dim);
1071 }
1072
1073 __isl_give isl_dim *isl_dim_from_domain(__isl_take isl_dim *dim)
1074 {
1075         return isl_dim_reverse(dim);
1076 }
1077
1078 struct isl_dim *isl_dim_range(struct isl_dim *dim)
1079 {
1080         if (!dim)
1081                 return NULL;
1082         return isl_dim_drop_inputs(dim, 0, dim->n_in);
1083 }
1084
1085 __isl_give isl_dim *isl_dim_from_range(__isl_take isl_dim *dim)
1086 {
1087         return dim;
1088 }
1089
1090 __isl_give isl_dim *isl_dim_as_set_dim(__isl_take isl_dim *dim)
1091 {
1092         dim = isl_dim_cow(dim);
1093         if (!dim)
1094                 return NULL;
1095
1096         dim->n_out += dim->n_in;
1097         dim->n_in = 0;
1098         dim = isl_dim_reset(dim, isl_dim_in);
1099         dim = isl_dim_reset(dim, isl_dim_out);
1100
1101         return dim;
1102 }
1103
1104 struct isl_dim *isl_dim_underlying(struct isl_dim *dim, unsigned n_div)
1105 {
1106         int i;
1107
1108         if (!dim)
1109                 return NULL;
1110         if (n_div == 0 &&
1111             dim->nparam == 0 && dim->n_in == 0 && dim->n_id == 0)
1112                 return isl_dim_reset(isl_dim_reset(dim, isl_dim_in), isl_dim_out);
1113         dim = isl_dim_cow(dim);
1114         if (!dim)
1115                 return NULL;
1116         dim->n_out += dim->nparam + dim->n_in + n_div;
1117         dim->nparam = 0;
1118         dim->n_in = 0;
1119
1120         for (i = 0; i < dim->n_id; ++i)
1121                 isl_id_free(get_id(dim, isl_dim_out, i));
1122         dim->n_id = 0;
1123         dim = isl_dim_reset(dim, isl_dim_in);
1124         dim = isl_dim_reset(dim, isl_dim_out);
1125
1126         return dim;
1127 }
1128
1129 unsigned isl_dim_total(struct isl_dim *dim)
1130 {
1131         return dim ? dim->nparam + dim->n_in + dim->n_out : 0;
1132 }
1133
1134 int isl_dim_equal(struct isl_dim *dim1, struct isl_dim *dim2)
1135 {
1136         if (!dim1 || !dim2)
1137                 return -1;
1138         return match(dim1, isl_dim_param, dim2, isl_dim_param) &&
1139                isl_dim_tuple_match(dim1, isl_dim_in, dim2, isl_dim_in) &&
1140                isl_dim_tuple_match(dim1, isl_dim_out, dim2, isl_dim_out);
1141 }
1142
1143 int isl_dim_compatible(struct isl_dim *dim1, struct isl_dim *dim2)
1144 {
1145         return dim1->nparam == dim2->nparam &&
1146                dim1->n_in + dim1->n_out == dim2->n_in + dim2->n_out;
1147 }
1148
1149 static uint32_t isl_hash_dim(uint32_t hash, __isl_keep isl_dim *dim)
1150 {
1151         int i;
1152         isl_id *id;
1153
1154         if (!dim)
1155                 return hash;
1156
1157         hash = isl_hash_builtin(hash, dim->nparam);
1158         hash = isl_hash_builtin(hash, dim->n_in);
1159         hash = isl_hash_builtin(hash, dim->n_out);
1160
1161         for (i = 0; i < dim->nparam; ++i) {
1162                 id = get_id(dim, isl_dim_param, i);
1163                 hash = isl_hash_id(hash, id);
1164         }
1165
1166         id = tuple_id(dim, isl_dim_in);
1167         hash = isl_hash_id(hash, id);
1168         id = tuple_id(dim, isl_dim_out);
1169         hash = isl_hash_id(hash, id);
1170
1171         hash = isl_hash_dim(hash, dim->nested[0]);
1172         hash = isl_hash_dim(hash, dim->nested[1]);
1173
1174         return hash;
1175 }
1176
1177 uint32_t isl_dim_get_hash(__isl_keep isl_dim *dim)
1178 {
1179         uint32_t hash;
1180
1181         if (!dim)
1182                 return 0;
1183
1184         hash = isl_hash_init();
1185         hash = isl_hash_dim(hash, dim);
1186
1187         return hash;
1188 }
1189
1190 int isl_dim_is_wrapping(__isl_keep isl_dim *dim)
1191 {
1192         if (!dim)
1193                 return -1;
1194
1195         if (dim->n_in != 0 || dim->tuple_id[0] || dim->nested[0])
1196                 return 0;
1197
1198         return dim->nested[1] != NULL;
1199 }
1200
1201 __isl_give isl_dim *isl_dim_wrap(__isl_take isl_dim *dim)
1202 {
1203         isl_dim *wrap;
1204
1205         if (!dim)
1206                 return NULL;
1207
1208         wrap = isl_dim_alloc(dim->ctx, dim->nparam, 0, dim->n_in + dim->n_out);
1209
1210         wrap = copy_ids(wrap, isl_dim_param, 0, dim, isl_dim_param);
1211         wrap = copy_ids(wrap, isl_dim_set, 0, dim, isl_dim_in);
1212         wrap = copy_ids(wrap, isl_dim_set, dim->n_in, dim, isl_dim_out);
1213
1214         if (!wrap)
1215                 goto error;
1216
1217         wrap->nested[1] = dim;
1218
1219         return wrap;
1220 error:
1221         isl_dim_free(dim);
1222         return NULL;
1223 }
1224
1225 __isl_give isl_dim *isl_dim_unwrap(__isl_take isl_dim *dim)
1226 {
1227         isl_dim *unwrap;
1228
1229         if (!dim)
1230                 return NULL;
1231
1232         if (!isl_dim_is_wrapping(dim))
1233                 isl_die(dim->ctx, isl_error_invalid, "not a wrapping dim",
1234                         goto error);
1235
1236         unwrap = isl_dim_copy(dim->nested[1]);
1237         isl_dim_free(dim);
1238
1239         return unwrap;
1240 error:
1241         isl_dim_free(dim);
1242         return NULL;
1243 }
1244
1245 int isl_dim_is_named_or_nested(__isl_keep isl_dim *dim, enum isl_dim_type type)
1246 {
1247         if (type != isl_dim_in && type != isl_dim_out)
1248                 return 0;
1249         if (!dim)
1250                 return -1;
1251         if (dim->tuple_id[type - isl_dim_in])
1252                 return 1;
1253         if (dim->nested[type - isl_dim_in])
1254                 return 1;
1255         return 0;
1256 }
1257
1258 int isl_dim_may_be_set(__isl_keep isl_dim *dim)
1259 {
1260         if (!dim)
1261                 return -1;
1262         if (isl_dim_size(dim, isl_dim_in) != 0)
1263                 return 0;
1264         if (isl_dim_is_named_or_nested(dim, isl_dim_in))
1265                 return 0;
1266         return 1;
1267 }
1268
1269 __isl_give isl_dim *isl_dim_reset(__isl_take isl_dim *dim,
1270         enum isl_dim_type type)
1271 {
1272         if (!isl_dim_is_named_or_nested(dim, type))
1273                 return dim;
1274
1275         dim = isl_dim_cow(dim);
1276         if (!dim)
1277                 return NULL;
1278
1279         isl_id_free(dim->tuple_id[type - isl_dim_in]);
1280         dim->tuple_id[type - isl_dim_in] = NULL;
1281         isl_dim_free(dim->nested[type - isl_dim_in]);
1282         dim->nested[type - isl_dim_in] = NULL;
1283
1284         return dim;
1285 }
1286
1287 __isl_give isl_dim *isl_dim_flatten(__isl_take isl_dim *dim)
1288 {
1289         if (!dim)
1290                 return NULL;
1291         if (!dim->nested[0] && !dim->nested[1])
1292                 return dim;
1293
1294         if (dim->nested[0])
1295                 dim = isl_dim_reset(dim, isl_dim_in);
1296         if (dim && dim->nested[1])
1297                 dim = isl_dim_reset(dim, isl_dim_out);
1298
1299         return dim;
1300 }
1301
1302 __isl_give isl_dim *isl_dim_flatten_range(__isl_take isl_dim *dim)
1303 {
1304         if (!dim)
1305                 return NULL;
1306         if (!dim->nested[1])
1307                 return dim;
1308
1309         return isl_dim_reset(dim, isl_dim_out);
1310 }
1311
1312 /* Replace the dimensions of the given type of dst by those of src.
1313  */
1314 __isl_give isl_dim *isl_dim_replace(__isl_take isl_dim *dst,
1315         enum isl_dim_type type, __isl_keep isl_dim *src)
1316 {
1317         dst = isl_dim_cow(dst);
1318
1319         if (!dst || !src)
1320                 goto error;
1321
1322         dst = isl_dim_drop(dst, type, 0, isl_dim_size(dst, type));
1323         dst = isl_dim_add(dst, type, isl_dim_size(src, type));
1324         dst = copy_ids(dst, type, 0, src, type);
1325
1326         if (dst && type == isl_dim_param) {
1327                 int i;
1328                 for (i = 0; i <= 1; ++i) {
1329                         if (!dst->nested[i])
1330                                 continue;
1331                         dst->nested[i] = isl_dim_replace(dst->nested[i],
1332                                                          type, src);
1333                         if (!dst->nested[i])
1334                                 goto error;
1335                 }
1336         }
1337
1338         return dst;
1339 error:
1340         isl_dim_free(dst);
1341         return NULL;
1342 }
1343
1344 /* Given a dimension specification "dim" of a set, create a dimension
1345  * specification for the lift of the set.  In particular, the result
1346  * is of the form [dim -> local[..]], with n_local variables in the
1347  * range of the wrapped map.
1348  */
1349 __isl_give isl_dim *isl_dim_lift(__isl_take isl_dim *dim, unsigned n_local)
1350 {
1351         isl_dim *local_dim;
1352
1353         if (!dim)
1354                 return NULL;
1355
1356         local_dim = isl_dim_dup(dim);
1357         local_dim = isl_dim_drop(local_dim, isl_dim_set, 0, dim->n_out);
1358         local_dim = isl_dim_add(local_dim, isl_dim_set, n_local);
1359         local_dim = isl_dim_set_tuple_name(local_dim, isl_dim_set, "local");
1360         dim = isl_dim_join(isl_dim_from_domain(dim),
1361                             isl_dim_from_range(local_dim));
1362         dim = isl_dim_wrap(dim);
1363         dim = isl_dim_set_tuple_name(dim, isl_dim_set, "lifted");
1364
1365         return dim;
1366 }
1367
1368 int isl_dim_can_zip(__isl_keep isl_dim *dim)
1369 {
1370         if (!dim)
1371                 return -1;
1372
1373         return dim->nested[0] && dim->nested[1];
1374 }
1375
1376 __isl_give isl_dim *isl_dim_zip(__isl_take isl_dim *dim)
1377 {
1378         isl_dim *dom, *ran;
1379         isl_dim *dom_dom, *dom_ran, *ran_dom, *ran_ran;
1380
1381         if (!isl_dim_can_zip(dim))
1382                 isl_die(dim->ctx, isl_error_invalid, "dim cannot be zipped",
1383                         goto error);
1384
1385         if (!dim)
1386                 return 0;
1387         dom = isl_dim_unwrap(isl_dim_domain(isl_dim_copy(dim)));
1388         ran = isl_dim_unwrap(isl_dim_range(dim));
1389         dom_dom = isl_dim_domain(isl_dim_copy(dom));
1390         dom_ran = isl_dim_range(dom);
1391         ran_dom = isl_dim_domain(isl_dim_copy(ran));
1392         ran_ran = isl_dim_range(ran);
1393         dom = isl_dim_join(isl_dim_from_domain(dom_dom),
1394                            isl_dim_from_range(ran_dom));
1395         ran = isl_dim_join(isl_dim_from_domain(dom_ran),
1396                            isl_dim_from_range(ran_ran));
1397         return isl_dim_join(isl_dim_from_domain(isl_dim_wrap(dom)),
1398                             isl_dim_from_range(isl_dim_wrap(ran)));
1399 error:
1400         isl_dim_free(dim);
1401         return NULL;
1402 }
1403
1404 int isl_dim_has_named_params(__isl_keep isl_dim *dim)
1405 {
1406         int i;
1407         unsigned off;
1408
1409         if (!dim)
1410                 return -1;
1411         if (dim->nparam == 0)
1412                 return 1;
1413         off = isl_dim_offset(dim, isl_dim_param);
1414         if (off + dim->nparam > dim->n_id)
1415                 return 0;
1416         for (i = 0; i < dim->nparam; ++i)
1417                 if (!dim->ids[off + i])
1418                         return 0;
1419         return 1;
1420 }
1421
1422 /* Align the initial parameters of dim1 to match the order in dim2.
1423  */
1424 __isl_give isl_dim *isl_dim_align_params(__isl_take isl_dim *dim1,
1425         __isl_take isl_dim *dim2)
1426 {
1427         isl_reordering *exp;
1428
1429         if (!isl_dim_has_named_params(dim1) || !isl_dim_has_named_params(dim2))
1430                 isl_die(isl_dim_get_ctx(dim1), isl_error_invalid,
1431                         "parameter alignment requires named parameters",
1432                         goto error);
1433
1434         exp = isl_parameter_alignment_reordering(dim1, dim2);
1435         isl_dim_free(dim1);
1436         isl_dim_free(dim2);
1437         if (!exp)
1438                 return NULL;
1439         dim1 = isl_dim_copy(exp->dim);
1440         isl_reordering_free(exp);
1441         return dim1;
1442 error:
1443         isl_dim_free(dim1);
1444         isl_dim_free(dim2);
1445         return NULL;
1446 }