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 __isl_give isl_id *isl_dim_get_tuple_id(__isl_keep isl_dim *dim,
 295         enum isl_dim_type type)
 296 {
 297         if (!dim)
 298                 return NULL;
 299         if (type != isl_dim_in && type != isl_dim_out)
 300                 return NULL;
 301         return isl_id_copy(dim->tuple_id[type - isl_dim_in]);
 302 }
 303
 304 __isl_give isl_dim *isl_dim_set_tuple_id(__isl_take isl_dim *dim,
 305         enum isl_dim_type type, __isl_take isl_id *id)
 306 {
 307         dim = isl_dim_cow(dim);
 308         if (!dim || !id)
 309                 goto error;
 310         if (type != isl_dim_in && type != isl_dim_out)
 311                 isl_die(dim->ctx, isl_error_invalid,
 312                         "only input, output and set tuples can have names",
 313                         goto error);
 314
 315         isl_id_free(dim->tuple_id[type - isl_dim_in]);
 316         dim->tuple_id[type - isl_dim_in] = id;
 317
 318         return dim;
 319 error:
 320         isl_id_free(id);
 321         isl_dim_free(dim);
 322         return NULL;
 323 }
 324
 325 __isl_give isl_dim *isl_dim_reset_tuple_id(__isl_take isl_dim *dim,
 326         enum isl_dim_type type)
 327 {
 328         dim = isl_dim_cow(dim);
 329         if (!dim)
 330                 return NULL;
 331         if (type != isl_dim_in && type != isl_dim_out)
 332                 isl_die(dim->ctx, isl_error_invalid,
 333                         "only input, output and set tuples can have names",
 334                         goto error);
 335
 336         isl_id_free(dim->tuple_id[type - isl_dim_in]);
 337         dim->tuple_id[type - isl_dim_in] = NULL;
 338
 339         return dim;
 340 error:
 341         isl_dim_free(dim);
 342         return NULL;
 343 }
 344
 345 __isl_give isl_dim *isl_dim_set_dim_id(__isl_take isl_dim *dim,
 346         enum isl_dim_type type, unsigned pos, __isl_take isl_id *id)
 347 {
 348         dim = isl_dim_cow(dim);
 349         if (!dim || !id)
 350                 goto error;
 351         isl_id_free(get_id(dim, type, pos));
 352         return set_id(dim, type, pos, id);
 353 error:
 354         isl_id_free(id);
 355         isl_dim_free(dim);
 356         return NULL;
 357 }
 358
 359 __isl_give isl_id *isl_dim_get_dim_id(__isl_keep isl_dim *dim,
 360         enum isl_dim_type type, unsigned pos)
 361 {
 362         return isl_id_copy(get_id(dim, type, pos));
 363 }
 364
 365 __isl_give isl_dim *isl_dim_set_tuple_name(__isl_take isl_dim *dim,
 366         enum isl_dim_type type, const char *s)
 367 {
 368         isl_id *id;
 369
 370         if (!dim)
 371                 return NULL;
 372
 373         if (!s)
 374                 return isl_dim_reset_tuple_id(dim, type);
 375
 376         if (!name_ok(dim->ctx, s))
 377                 goto error;
 378
 379         id = isl_id_alloc(dim->ctx, s, NULL);
 380         return isl_dim_set_tuple_id(dim, type, id);
 381 error:
 382         isl_dim_free(dim);
 383         return NULL;
 384 }
 385
 386 const char *isl_dim_get_tuple_name(__isl_keep isl_dim *dim,
 387          enum isl_dim_type type)
 388 {
 389         isl_id *id;
 390         if (!dim)
 391                 return NULL;
 392         if (type != isl_dim_in && type != isl_dim_out)
 393                 return NULL;
 394         id = dim->tuple_id[type - isl_dim_in];
 395         return id ? id->name : NULL;
 396 }
 397
 398 struct isl_dim *isl_dim_set_name(struct isl_dim *dim,
 399                                  enum isl_dim_type type, unsigned pos,
 400                                  const char *s)
 401 {
 402         isl_id *id;
 403
 404         if (!dim)
 405                 return NULL;
 406         if (!name_ok(dim->ctx, s))
 407                 goto error;
 408         id = isl_id_alloc(dim->ctx, s, NULL);
 409         return isl_dim_set_dim_id(dim, type, pos, id);
 410 error:
 411         isl_dim_free(dim);
 412         return NULL;
 413 }
 414
 415 const char *isl_dim_get_name(struct isl_dim *dim,
 416                                  enum isl_dim_type type, unsigned pos)
 417 {
 418         isl_id *id = get_id(dim, type, pos);
 419         return id ? id->name : NULL;
 420 }
 421
 422 int isl_dim_find_dim_by_id(__isl_keep isl_dim *dim, enum isl_dim_type type,
 423         __isl_keep isl_id *id)
 424 {
 425         int i;
 426         int offset;
 427         int n;
 428
 429         if (!dim || !id)
 430                 return -1;
 431
 432         offset = isl_dim_offset(dim, type);
 433         n = isl_dim_size(dim, type);
 434         for (i = 0; i < n && offset + i < dim->n_id; ++i)
 435                 if (dim->ids[offset + i] == id)
 436                         return i;
 437
 438         return -1;
 439 }
 440
 441 static __isl_keep isl_id *tuple_id(__isl_keep isl_dim *dim,
 442         enum isl_dim_type type)
 443 {
 444         if (!dim)
 445                 return NULL;
 446         if (type == isl_dim_in)
 447                 return dim->tuple_id[0];
 448         if (type == isl_dim_out)
 449                 return dim->tuple_id[1];
 450         return NULL;
 451 }
 452
 453 static __isl_keep isl_dim *nested(__isl_keep isl_dim *dim,
 454         enum isl_dim_type type)
 455 {
 456         if (!dim)
 457                 return NULL;
 458         if (type == isl_dim_in)
 459                 return dim->nested[0];
 460         if (type == isl_dim_out)
 461                 return dim->nested[1];
 462         return NULL;
 463 }
 464
 465 int isl_dim_tuple_match(__isl_keep isl_dim *dim1, enum isl_dim_type dim1_type,
 466                         __isl_keep isl_dim *dim2, enum isl_dim_type dim2_type)
 467 {
 468         isl_id *id1, *id2;
 469         isl_dim *nested1, *nested2;
 470
 471         if (n(dim1, dim1_type) != n(dim2, dim2_type))
 472                 return 0;
 473         id1 = tuple_id(dim1, dim1_type);
 474         id2 = tuple_id(dim2, dim2_type);
 475         if (!id1 ^ !id2)
 476                 return 0;
 477         if (id1 && id1 != id2)
 478                 return 0;
 479         nested1 = nested(dim1, dim1_type);
 480         nested2 = nested(dim2, dim2_type);
 481         if (!nested1 ^ !nested2)
 482                 return 0;
 483         if (nested1 && !isl_dim_equal(nested1, nested2))
 484                 return 0;
 485         return 1;
 486 }
 487
 488 static int match(struct isl_dim *dim1, enum isl_dim_type dim1_type,
 489                 struct isl_dim *dim2, enum isl_dim_type dim2_type)
 490 {
 491         int i;
 492
 493         if (!isl_dim_tuple_match(dim1, dim1_type, dim2, dim2_type))
 494                 return 0;
 495
 496         if (!dim1->ids && !dim2->ids)
 497                 return 1;
 498
 499         for (i = 0; i < n(dim1, dim1_type); ++i) {
 500                 if (get_id(dim1, dim1_type, i) != get_id(dim2, dim2_type, i))
 501                         return 0;
 502         }
 503         return 1;
 504 }
 505
 506 int isl_dim_match(struct isl_dim *dim1, enum isl_dim_type dim1_type,
 507                 struct isl_dim *dim2, enum isl_dim_type dim2_type)
 508 {
 509         return match(dim1, dim1_type, dim2, dim2_type);
 510 }
 511
 512 static void get_ids(struct isl_dim *dim, enum isl_dim_type type,
 513         unsigned first, unsigned n, __isl_keep isl_id **ids)
 514 {
 515         int i;
 516
 517         for (i = 0; i < n ; ++i)
 518                 ids[i] = get_id(dim, type, first + i);
 519 }
 520
 521 struct isl_dim *isl_dim_extend(struct isl_dim *dim,
 522                         unsigned nparam, unsigned n_in, unsigned n_out)
 523 {
 524         isl_id **ids = NULL;
 525
 526         if (!dim)
 527                 return NULL;
 528         if (dim->nparam == nparam && dim->n_in == n_in && dim->n_out == n_out)
 529                 return dim;
 530
 531         isl_assert(dim->ctx, dim->nparam <= nparam, goto error);
 532         isl_assert(dim->ctx, dim->n_in <= n_in, goto error);
 533         isl_assert(dim->ctx, dim->n_out <= n_out, goto error);
 534
 535         dim = isl_dim_cow(dim);
 536
 537         if (dim->ids) {
 538                 ids = isl_calloc_array(dim->ctx, isl_id *,
 539                                          nparam + n_in + n_out);
 540                 if (!ids)
 541                         goto error;
 542                 get_ids(dim, isl_dim_param, 0, dim->nparam, ids);
 543                 get_ids(dim, isl_dim_in, 0, dim->n_in, ids + nparam);
 544                 get_ids(dim, isl_dim_out, 0, dim->n_out, ids + nparam + n_in);
 545                 free(dim->ids);
 546                 dim->ids = ids;
 547                 dim->n_id = nparam + n_in + n_out;
 548         }
 549         dim->nparam = nparam;
 550         dim->n_in = n_in;
 551         dim->n_out = n_out;
 552
 553         return dim;
 554 error:
 555         free(ids);
 556         isl_dim_free(dim);
 557         return NULL;
 558 }
 559
 560 struct isl_dim *isl_dim_add(struct isl_dim *dim, enum isl_dim_type type,
 561         unsigned n)
 562 {
 563         if (!dim)
 564                 return NULL;
 565         dim = isl_dim_reset(dim, type);
 566         switch (type) {
 567         case isl_dim_param:
 568                 dim = isl_dim_extend(dim,
 569                                         dim->nparam + n, dim->n_in, dim->n_out);
 570                 if (dim && dim->nested[0] &&
 571                     !(dim->nested[0] = isl_dim_add(dim->nested[0],
 572                                                     isl_dim_param, n)))
 573                         goto error;
 574                 if (dim && dim->nested[1] &&
 575                     !(dim->nested[1] = isl_dim_add(dim->nested[1],
 576                                                     isl_dim_param, n)))
 577                         goto error;
 578                 return dim;
 579         case isl_dim_in:
 580                 return isl_dim_extend(dim,
 581                                         dim->nparam, dim->n_in + n, dim->n_out);
 582         case isl_dim_out:
 583                 return isl_dim_extend(dim,
 584                                         dim->nparam, dim->n_in, dim->n_out + n);
 585         default:
 586                 isl_die(dim->ctx, isl_error_invalid,
 587                         "cannot add dimensions of specified type", goto error);
 588         }
 589 error:
 590         isl_dim_free(dim);
 591         return NULL;
 592 }
 593
 594 static int valid_dim_type(enum isl_dim_type type)
 595 {
 596         switch (type) {
 597         case isl_dim_param:
 598         case isl_dim_in:
 599         case isl_dim_out:
 600                 return 1;
 601         default:
 602                 return 0;
 603         }
 604 }
 605
 606 __isl_give isl_dim *isl_dim_insert(__isl_take isl_dim *dim,
 607         enum isl_dim_type type, unsigned pos, unsigned n)
 608 {
 609         isl_id **ids = NULL;
 610
 611         if (!dim)
 612                 return NULL;
 613         if (n == 0)
 614                 return isl_dim_reset(dim, type);
 615
 616         if (!valid_dim_type(type))
 617                 isl_die(dim->ctx, isl_error_invalid,
 618                         "cannot insert dimensions of specified type",
 619                         goto error);
 620
 621         isl_assert(dim->ctx, pos <= isl_dim_size(dim, type), goto error);
 622
 623         dim = isl_dim_cow(dim);
 624         if (!dim)
 625                 return NULL;
 626
 627         if (dim->ids) {
 628                 enum isl_dim_type t;
 629                 int off;
 630                 int s[3];
 631                 int *size = s - isl_dim_param;
 632                 ids = isl_calloc_array(dim->ctx, isl_id *,
 633                                      dim->nparam + dim->n_in + dim->n_out + n);
 634                 if (!ids)
 635                         goto error;
 636                 off = 0;
 637                 size[isl_dim_param] = dim->nparam;
 638                 size[isl_dim_in] = dim->n_in;
 639                 size[isl_dim_out] = dim->n_out;
 640                 for (t = isl_dim_param; t <= isl_dim_out; ++t) {
 641                         if (t != type) {
 642                                 get_ids(dim, t, 0, size[t], ids + off);
 643                                 off += size[t];
 644                         } else {
 645                                 get_ids(dim, t, 0, pos, ids + off);
 646                                 off += pos + n;
 647                                 get_ids(dim, t, pos, size[t] - pos, ids + off);
 648                                 off += size[t] - pos;
 649                         }
 650                 }
 651                 free(dim->ids);
 652                 dim->ids = ids;
 653                 dim->n_id = dim->nparam + dim->n_in + dim->n_out + n;
 654         }
 655         switch (type) {
 656         case isl_dim_param:     dim->nparam += n; break;
 657         case isl_dim_in:        dim->n_in += n; break;
 658         case isl_dim_out:       dim->n_out += n; break;
 659         default:                ;
 660         }
 661         dim = isl_dim_reset(dim, type);
 662
 663         return dim;
 664 error:
 665         isl_dim_free(dim);
 666         return NULL;
 667 }
 668
 669 __isl_give isl_dim *isl_dim_move(__isl_take isl_dim *dim,
 670         enum isl_dim_type dst_type, unsigned dst_pos,
 671         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 672 {
 673         int i;
 674
 675         if (!dim)
 676                 return NULL;
 677         if (n == 0)
 678                 return dim;
 679
 680         isl_assert(dim->ctx, src_pos + n <= isl_dim_size(dim, src_type),
 681                 goto error);
 682
 683         if (dst_type == src_type && dst_pos == src_pos)
 684                 return dim;
 685
 686         isl_assert(dim->ctx, dst_type != src_type, goto error);
 687
 688         dim = isl_dim_reset(dim, src_type);
 689         dim = isl_dim_reset(dim, dst_type);
 690
 691         dim = isl_dim_cow(dim);
 692         if (!dim)
 693                 return NULL;
 694
 695         if (dim->ids) {
 696                 isl_id **ids;
 697                 enum isl_dim_type t;
 698                 int off;
 699                 int s[3];
 700                 int *size = s - isl_dim_param;
 701                 ids = isl_calloc_array(dim->ctx, isl_id *,
 702                                          dim->nparam + dim->n_in + dim->n_out);
 703                 if (!ids)
 704                         goto error;
 705                 off = 0;
 706                 size[isl_dim_param] = dim->nparam;
 707                 size[isl_dim_in] = dim->n_in;
 708                 size[isl_dim_out] = dim->n_out;
 709                 for (t = isl_dim_param; t <= isl_dim_out; ++t) {
 710                         if (t == dst_type) {
 711                                 get_ids(dim, t, 0, dst_pos, ids + off);
 712                                 off += dst_pos;
 713                                 get_ids(dim, src_type, src_pos, n, ids + off);
 714                                 off += n;
 715                                 get_ids(dim, t, dst_pos, size[t] - dst_pos,
 716                                                 ids + off);
 717                                 off += size[t] - dst_pos;
 718                         } else if (t == src_type) {
 719                                 get_ids(dim, t, 0, src_pos, ids + off);
 720                                 off += src_pos;
 721                                 get_ids(dim, t, src_pos + n,
 722                                             size[t] - src_pos - n, ids + off);
 723                                 off += size[t] - src_pos - n;
 724                         } else {
 725                                 get_ids(dim, t, 0, size[t], ids + off);
 726                                 off += size[t];
 727                         }
 728                 }
 729                 free(dim->ids);
 730                 dim->ids = ids;
 731                 dim->n_id = dim->nparam + dim->n_in + dim->n_out;
 732         }
 733
 734         switch (dst_type) {
 735         case isl_dim_param:     dim->nparam += n; break;
 736         case isl_dim_in:        dim->n_in += n; break;
 737         case isl_dim_out:       dim->n_out += n; break;
 738         default:                ;
 739         }
 740
 741         switch (src_type) {
 742         case isl_dim_param:     dim->nparam -= n; break;
 743         case isl_dim_in:        dim->n_in -= n; break;
 744         case isl_dim_out:       dim->n_out -= n; break;
 745         default:                ;
 746         }
 747
 748         if (dst_type != isl_dim_param && src_type != isl_dim_param)
 749                 return dim;
 750
 751         for (i = 0; i < 2; ++i) {
 752                 if (!dim->nested[i])
 753                         continue;
 754                 dim->nested[i] = isl_dim_replace(dim->nested[i],
 755                                                  isl_dim_param, dim);
 756                 if (!dim->nested[i])
 757                         goto error;
 758         }
 759
 760         return dim;
 761 error:
 762         isl_dim_free(dim);
 763         return NULL;
 764 }
 765
 766 struct isl_dim *isl_dim_join(struct isl_dim *left, struct isl_dim *right)
 767 {
 768         struct isl_dim *dim;
 769
 770         if (!left || !right)
 771                 goto error;
 772
 773         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 774                         goto error);
 775         isl_assert(left->ctx,
 776                 isl_dim_tuple_match(left, isl_dim_out, right, isl_dim_in),
 777                 goto error);
 778
 779         dim = isl_dim_alloc(left->ctx, left->nparam, left->n_in, right->n_out);
 780         if (!dim)
 781                 goto error;
 782
 783         dim = copy_ids(dim, isl_dim_param, 0, left, isl_dim_param);
 784         dim = copy_ids(dim, isl_dim_in, 0, left, isl_dim_in);
 785         dim = copy_ids(dim, isl_dim_out, 0, right, isl_dim_out);
 786
 787         if (dim && left->tuple_id[0] &&
 788             !(dim->tuple_id[0] = isl_id_copy(left->tuple_id[0])))
 789                 goto error;
 790         if (dim && right->tuple_id[1] &&
 791             !(dim->tuple_id[1] = isl_id_copy(right->tuple_id[1])))
 792                 goto error;
 793         if (dim && left->nested[0] &&
 794             !(dim->nested[0] = isl_dim_copy(left->nested[0])))
 795                 goto error;
 796         if (dim && right->nested[1] &&
 797             !(dim->nested[1] = isl_dim_copy(right->nested[1])))
 798                 goto error;
 799
 800         isl_dim_free(left);
 801         isl_dim_free(right);
 802
 803         return dim;
 804 error:
 805         isl_dim_free(left);
 806         isl_dim_free(right);
 807         return NULL;
 808 }
 809
 810 struct isl_dim *isl_dim_product(struct isl_dim *left, struct isl_dim *right)
 811 {
 812         isl_dim *dom1, *dom2, *nest1, *nest2;
 813
 814         if (!left || !right)
 815                 goto error;
 816
 817         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 818                         goto error);
 819
 820         dom1 = isl_dim_domain(isl_dim_copy(left));
 821         dom2 = isl_dim_domain(isl_dim_copy(right));
 822         nest1 = isl_dim_wrap(isl_dim_join(isl_dim_reverse(dom1), dom2));
 823
 824         dom1 = isl_dim_range(left);
 825         dom2 = isl_dim_range(right);
 826         nest2 = isl_dim_wrap(isl_dim_join(isl_dim_reverse(dom1), dom2));
 827
 828         return isl_dim_join(isl_dim_reverse(nest1), nest2);
 829 error:
 830         isl_dim_free(left);
 831         isl_dim_free(right);
 832         return NULL;
 833 }
 834
 835 __isl_give isl_dim *isl_dim_range_product(__isl_take isl_dim *left,
 836         __isl_take isl_dim *right)
 837 {
 838         isl_dim *dom, *ran1, *ran2, *nest;
 839
 840         if (!left || !right)
 841                 goto error;
 842
 843         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 844                         goto error);
 845         if (!isl_dim_tuple_match(left, isl_dim_in, right, isl_dim_in))
 846                 isl_die(left->ctx, isl_error_invalid,
 847                         "domains need to match", goto error);
 848
 849         dom = isl_dim_domain(isl_dim_copy(left));
 850
 851         ran1 = isl_dim_range(left);
 852         ran2 = isl_dim_range(right);
 853         nest = isl_dim_wrap(isl_dim_join(isl_dim_reverse(ran1), ran2));
 854
 855         return isl_dim_join(isl_dim_reverse(dom), nest);
 856 error:
 857         isl_dim_free(left);
 858         isl_dim_free(right);
 859         return NULL;
 860 }
 861
 862 __isl_give isl_dim *isl_dim_map_from_set(__isl_take isl_dim *dim)
 863 {
 864         isl_id **ids = NULL;
 865
 866         if (!dim)
 867                 return NULL;
 868         isl_assert(dim->ctx, dim->n_in == 0, goto error);
 869         if (dim->n_out == 0 && !isl_dim_is_named_or_nested(dim, isl_dim_out))
 870                 return dim;
 871         dim = isl_dim_cow(dim);
 872         if (!dim)
 873                 return NULL;
 874         if (dim->ids) {
 875                 ids = isl_calloc_array(dim->ctx, isl_id *,
 876                                         dim->nparam + dim->n_out + dim->n_out);
 877                 if (!ids)
 878                         goto error;
 879                 get_ids(dim, isl_dim_param, 0, dim->nparam, ids);
 880                 get_ids(dim, isl_dim_out, 0, dim->n_out, ids + dim->nparam);
 881         }
 882         dim->n_in = dim->n_out;
 883         if (ids) {
 884                 free(dim->ids);
 885                 dim->ids = ids;
 886                 dim->n_id = dim->nparam + dim->n_out + dim->n_out;
 887                 dim = copy_ids(dim, isl_dim_out, 0, dim, isl_dim_in);
 888         }
 889         isl_id_free(dim->tuple_id[0]);
 890         dim->tuple_id[0] = isl_id_copy(dim->tuple_id[1]);
 891         isl_dim_free(dim->nested[0]);
 892         dim->nested[0] = isl_dim_copy(dim->nested[1]);
 893         return dim;
 894 error:
 895         isl_dim_free(dim);
 896         return NULL;
 897 }
 898
 899 static __isl_give isl_dim *set_ids(struct isl_dim *dim, enum isl_dim_type type,
 900         unsigned first, unsigned n, __isl_take isl_id **ids)
 901 {
 902         int i;
 903
 904         for (i = 0; i < n ; ++i)
 905                 dim = set_id(dim, type, first + i, ids[i]);
 906
 907         return dim;
 908 }
 909
 910 struct isl_dim *isl_dim_reverse(struct isl_dim *dim)
 911 {
 912         unsigned t;
 913         isl_dim *nested;
 914         isl_id **ids = NULL;
 915         isl_id *id;
 916
 917         if (!dim)
 918                 return NULL;
 919         if (match(dim, isl_dim_in, dim, isl_dim_out))
 920                 return dim;
 921
 922         dim = isl_dim_cow(dim);
 923         if (!dim)
 924                 return NULL;
 925
 926         id = dim->tuple_id[0];
 927         dim->tuple_id[0] = dim->tuple_id[1];
 928         dim->tuple_id[1] = id;
 929
 930         nested = dim->nested[0];
 931         dim->nested[0] = dim->nested[1];
 932         dim->nested[1] = nested;
 933
 934         if (dim->ids) {
 935                 ids = isl_alloc_array(dim->ctx, isl_id *,
 936                                         dim->n_in + dim->n_out);
 937                 if (!ids)
 938                         goto error;
 939                 get_ids(dim, isl_dim_in, 0, dim->n_in, ids);
 940                 get_ids(dim, isl_dim_out, 0, dim->n_out, ids + dim->n_in);
 941         }
 942
 943         t = dim->n_in;
 944         dim->n_in = dim->n_out;
 945         dim->n_out = t;
 946
 947         if (dim->ids) {
 948                 dim = set_ids(dim, isl_dim_out, 0, dim->n_out, ids);
 949                 dim = set_ids(dim, isl_dim_in, 0, dim->n_in, ids + dim->n_out);
 950                 free(ids);
 951         }
 952
 953         return dim;
 954 error:
 955         free(ids);
 956         isl_dim_free(dim);
 957         return NULL;
 958 }
 959
 960 struct isl_dim *isl_dim_drop(struct isl_dim *dim, enum isl_dim_type type,
 961                 unsigned first, unsigned num)
 962 {
 963         int i;
 964
 965         if (!dim)
 966                 return NULL;
 967
 968         if (num == 0)
 969                 return isl_dim_reset(dim, type);
 970
 971         if (!valid_dim_type(type))
 972                 isl_die(dim->ctx, isl_error_invalid,
 973                         "cannot drop dimensions of specified type", goto error);
 974
 975         isl_assert(dim->ctx, first + num <= n(dim, type), goto error);
 976         dim = isl_dim_cow(dim);
 977         if (!dim)
 978                 goto error;
 979         if (dim->ids) {
 980                 dim = extend_ids(dim);
 981                 if (!dim)
 982                         goto error;
 983                 for (i = 0; i < num; ++i)
 984                         isl_id_free(get_id(dim, type, first + i));
 985                 for (i = first+num; i < n(dim, type); ++i)
 986                         set_id(dim, type, i - num, get_id(dim, type, i));
 987                 switch (type) {
 988                 case isl_dim_param:
 989                         get_ids(dim, isl_dim_in, 0, dim->n_in,
 990                                 dim->ids + offset(dim, isl_dim_in) - num);
 991                 case isl_dim_in:
 992                         get_ids(dim, isl_dim_out, 0, dim->n_out,
 993                                 dim->ids + offset(dim, isl_dim_out) - num);
 994                 default:
 995                         ;
 996                 }
 997                 dim->n_id -= num;
 998         }
 999         switch (type) {
1000         case isl_dim_param:     dim->nparam -= num; break;
1001         case isl_dim_in:        dim->n_in -= num; break;
1002         case isl_dim_out:       dim->n_out -= num; break;
1003         default:                ;
1004         }
1005         dim = isl_dim_reset(dim, type);
1006         if (type == isl_dim_param) {
1007                 if (dim && dim->nested[0] &&
1008                     !(dim->nested[0] = isl_dim_drop(dim->nested[0],
1009                                                     isl_dim_param, first, num)))
1010                         goto error;
1011                 if (dim && dim->nested[1] &&
1012                     !(dim->nested[1] = isl_dim_drop(dim->nested[1],
1013                                                     isl_dim_param, first, num)))
1014                         goto error;
1015         }
1016         return dim;
1017 error:
1018         isl_dim_free(dim);
1019         return NULL;
1020 }
1021
1022 struct isl_dim *isl_dim_drop_inputs(struct isl_dim *dim,
1023                 unsigned first, unsigned n)
1024 {
1025         if (!dim)
1026                 return NULL;
1027         return isl_dim_drop(dim, isl_dim_in, first, n);
1028 }
1029
1030 struct isl_dim *isl_dim_drop_outputs(struct isl_dim *dim,
1031                 unsigned first, unsigned n)
1032 {
1033         if (!dim)
1034                 return NULL;
1035         return isl_dim_drop(dim, isl_dim_out, first, n);
1036 }
1037
1038 struct isl_dim *isl_dim_domain(struct isl_dim *dim)
1039 {
1040         if (!dim)
1041                 return NULL;
1042         dim = isl_dim_drop_outputs(dim, 0, dim->n_out);
1043         return isl_dim_reverse(dim);
1044 }
1045
1046 __isl_give isl_dim *isl_dim_from_domain(__isl_take isl_dim *dim)
1047 {
1048         return isl_dim_reverse(dim);
1049 }
1050
1051 struct isl_dim *isl_dim_range(struct isl_dim *dim)
1052 {
1053         if (!dim)
1054                 return NULL;
1055         return isl_dim_drop_inputs(dim, 0, dim->n_in);
1056 }
1057
1058 __isl_give isl_dim *isl_dim_from_range(__isl_take isl_dim *dim)
1059 {
1060         return dim;
1061 }
1062
1063 __isl_give isl_dim *isl_dim_as_set_dim(__isl_take isl_dim *dim)
1064 {
1065         dim = isl_dim_cow(dim);
1066         if (!dim)
1067                 return NULL;
1068
1069         dim->n_out += dim->n_in;
1070         dim->n_in = 0;
1071         dim = isl_dim_reset(dim, isl_dim_in);
1072         dim = isl_dim_reset(dim, isl_dim_out);
1073
1074         return dim;
1075 }
1076
1077 struct isl_dim *isl_dim_underlying(struct isl_dim *dim, unsigned n_div)
1078 {
1079         int i;
1080
1081         if (!dim)
1082                 return NULL;
1083         if (n_div == 0 &&
1084             dim->nparam == 0 && dim->n_in == 0 && dim->n_id == 0)
1085                 return isl_dim_reset(isl_dim_reset(dim, isl_dim_in), isl_dim_out);
1086         dim = isl_dim_cow(dim);
1087         if (!dim)
1088                 return NULL;
1089         dim->n_out += dim->nparam + dim->n_in + n_div;
1090         dim->nparam = 0;
1091         dim->n_in = 0;
1092
1093         for (i = 0; i < dim->n_id; ++i)
1094                 isl_id_free(get_id(dim, isl_dim_out, i));
1095         dim->n_id = 0;
1096         dim = isl_dim_reset(dim, isl_dim_in);
1097         dim = isl_dim_reset(dim, isl_dim_out);
1098
1099         return dim;
1100 }
1101
1102 unsigned isl_dim_total(struct isl_dim *dim)
1103 {
1104         return dim ? dim->nparam + dim->n_in + dim->n_out : 0;
1105 }
1106
1107 int isl_dim_equal(struct isl_dim *dim1, struct isl_dim *dim2)
1108 {
1109         return match(dim1, isl_dim_param, dim2, isl_dim_param) &&
1110                isl_dim_tuple_match(dim1, isl_dim_in, dim2, isl_dim_in) &&
1111                isl_dim_tuple_match(dim1, isl_dim_out, dim2, isl_dim_out);
1112 }
1113
1114 int isl_dim_compatible(struct isl_dim *dim1, struct isl_dim *dim2)
1115 {
1116         return dim1->nparam == dim2->nparam &&
1117                dim1->n_in + dim1->n_out == dim2->n_in + dim2->n_out;
1118 }
1119
1120 static uint32_t isl_hash_dim(uint32_t hash, __isl_keep isl_dim *dim)
1121 {
1122         int i;
1123         isl_id *id;
1124
1125         if (!dim)
1126                 return hash;
1127
1128         hash = isl_hash_builtin(hash, dim->nparam);
1129         hash = isl_hash_builtin(hash, dim->n_in);
1130         hash = isl_hash_builtin(hash, dim->n_out);
1131
1132         for (i = 0; i < dim->nparam; ++i) {
1133                 id = get_id(dim, isl_dim_param, i);
1134                 hash = isl_hash_id(hash, id);
1135         }
1136
1137         id = tuple_id(dim, isl_dim_in);
1138         hash = isl_hash_id(hash, id);
1139         id = tuple_id(dim, isl_dim_out);
1140         hash = isl_hash_id(hash, id);
1141
1142         hash = isl_hash_dim(hash, dim->nested[0]);
1143         hash = isl_hash_dim(hash, dim->nested[1]);
1144
1145         return hash;
1146 }
1147
1148 uint32_t isl_dim_get_hash(__isl_keep isl_dim *dim)
1149 {
1150         uint32_t hash;
1151
1152         if (!dim)
1153                 return 0;
1154
1155         hash = isl_hash_init();
1156         hash = isl_hash_dim(hash, dim);
1157
1158         return hash;
1159 }
1160
1161 int isl_dim_is_wrapping(__isl_keep isl_dim *dim)
1162 {
1163         if (!dim)
1164                 return -1;
1165
1166         if (dim->n_in != 0 || dim->tuple_id[0] || dim->nested[0])
1167                 return 0;
1168
1169         return dim->nested[1] != NULL;
1170 }
1171
1172 __isl_give isl_dim *isl_dim_wrap(__isl_take isl_dim *dim)
1173 {
1174         isl_dim *wrap;
1175
1176         if (!dim)
1177                 return NULL;
1178
1179         wrap = isl_dim_alloc(dim->ctx, dim->nparam, 0, dim->n_in + dim->n_out);
1180
1181         wrap = copy_ids(wrap, isl_dim_param, 0, dim, isl_dim_param);
1182         wrap = copy_ids(wrap, isl_dim_set, 0, dim, isl_dim_in);
1183         wrap = copy_ids(wrap, isl_dim_set, dim->n_in, dim, isl_dim_out);
1184
1185         if (!wrap)
1186                 goto error;
1187
1188         wrap->nested[1] = dim;
1189
1190         return wrap;
1191 error:
1192         isl_dim_free(dim);
1193         return NULL;
1194 }
1195
1196 __isl_give isl_dim *isl_dim_unwrap(__isl_take isl_dim *dim)
1197 {
1198         isl_dim *unwrap;
1199
1200         if (!dim)
1201                 return NULL;
1202
1203         if (!isl_dim_is_wrapping(dim))
1204                 isl_die(dim->ctx, isl_error_invalid, "not a wrapping dim",
1205                         goto error);
1206
1207         unwrap = isl_dim_copy(dim->nested[1]);
1208         isl_dim_free(dim);
1209
1210         return unwrap;
1211 error:
1212         isl_dim_free(dim);
1213         return NULL;
1214 }
1215
1216 int isl_dim_is_named_or_nested(__isl_keep isl_dim *dim, enum isl_dim_type type)
1217 {
1218         if (type != isl_dim_in && type != isl_dim_out)
1219                 return 0;
1220         if (!dim)
1221                 return -1;
1222         if (dim->tuple_id[type - isl_dim_in])
1223                 return 1;
1224         if (dim->nested[type - isl_dim_in])
1225                 return 1;
1226         return 0;
1227 }
1228
1229 int isl_dim_may_be_set(__isl_keep isl_dim *dim)
1230 {
1231         if (!dim)
1232                 return -1;
1233         if (isl_dim_size(dim, isl_dim_in) != 0)
1234                 return 0;
1235         if (isl_dim_is_named_or_nested(dim, isl_dim_in))
1236                 return 0;
1237         return 1;
1238 }
1239
1240 __isl_give isl_dim *isl_dim_reset(__isl_take isl_dim *dim,
1241         enum isl_dim_type type)
1242 {
1243         if (!isl_dim_is_named_or_nested(dim, type))
1244                 return dim;
1245
1246         dim = isl_dim_cow(dim);
1247         if (!dim)
1248                 return NULL;
1249
1250         isl_id_free(dim->tuple_id[type - isl_dim_in]);
1251         dim->tuple_id[type - isl_dim_in] = NULL;
1252         isl_dim_free(dim->nested[type - isl_dim_in]);
1253         dim->nested[type - isl_dim_in] = NULL;
1254
1255         return dim;
1256 }
1257
1258 __isl_give isl_dim *isl_dim_flatten(__isl_take isl_dim *dim)
1259 {
1260         if (!dim)
1261                 return NULL;
1262         if (!dim->nested[0] && !dim->nested[1])
1263                 return dim;
1264
1265         if (dim->nested[0])
1266                 dim = isl_dim_reset(dim, isl_dim_in);
1267         if (dim && dim->nested[1])
1268                 dim = isl_dim_reset(dim, isl_dim_out);
1269
1270         return dim;
1271 }
1272
1273 __isl_give isl_dim *isl_dim_flatten_range(__isl_take isl_dim *dim)
1274 {
1275         if (!dim)
1276                 return NULL;
1277         if (!dim->nested[1])
1278                 return dim;
1279
1280         return isl_dim_reset(dim, isl_dim_out);
1281 }
1282
1283 /* Replace the dimensions of the given type of dst by those of src.
1284  */
1285 __isl_give isl_dim *isl_dim_replace(__isl_take isl_dim *dst,
1286         enum isl_dim_type type, __isl_keep isl_dim *src)
1287 {
1288         dst = isl_dim_cow(dst);
1289
1290         if (!dst || !src)
1291                 goto error;
1292
1293         dst = isl_dim_drop(dst, type, 0, isl_dim_size(dst, type));
1294         dst = isl_dim_add(dst, type, isl_dim_size(src, type));
1295         dst = copy_ids(dst, type, 0, src, type);
1296
1297         if (dst && type == isl_dim_param) {
1298                 int i;
1299                 for (i = 0; i <= 1; ++i) {
1300                         if (!dst->nested[i])
1301                                 continue;
1302                         dst->nested[i] = isl_dim_replace(dst->nested[i],
1303                                                          type, src);
1304                         if (!dst->nested[i])
1305                                 goto error;
1306                 }
1307         }
1308
1309         return dst;
1310 error:
1311         isl_dim_free(dst);
1312         return NULL;
1313 }
1314
1315 /* Given a dimension specification "dim" of a set, create a dimension
1316  * specification for the lift of the set.  In particular, the result
1317  * is of the form [dim -> local[..]], with n_local variables in the
1318  * range of the wrapped map.
1319  */
1320 __isl_give isl_dim *isl_dim_lift(__isl_take isl_dim *dim, unsigned n_local)
1321 {
1322         isl_dim *local_dim;
1323
1324         if (!dim)
1325                 return NULL;
1326
1327         local_dim = isl_dim_dup(dim);
1328         local_dim = isl_dim_drop(local_dim, isl_dim_set, 0, dim->n_out);
1329         local_dim = isl_dim_add(local_dim, isl_dim_set, n_local);
1330         local_dim = isl_dim_set_tuple_name(local_dim, isl_dim_set, "local");
1331         dim = isl_dim_join(isl_dim_from_domain(dim),
1332                             isl_dim_from_range(local_dim));
1333         dim = isl_dim_wrap(dim);
1334         dim = isl_dim_set_tuple_name(dim, isl_dim_set, "lifted");
1335
1336         return dim;
1337 }
1338
1339 int isl_dim_can_zip(__isl_keep isl_dim *dim)
1340 {
1341         if (!dim)
1342                 return -1;
1343
1344         return dim->nested[0] && dim->nested[1];
1345 }
1346
1347 __isl_give isl_dim *isl_dim_zip(__isl_take isl_dim *dim)
1348 {
1349         isl_dim *dom, *ran;
1350         isl_dim *dom_dom, *dom_ran, *ran_dom, *ran_ran;
1351
1352         if (!isl_dim_can_zip(dim))
1353                 isl_die(dim->ctx, isl_error_invalid, "dim cannot be zipped",
1354                         goto error);
1355
1356         if (!dim)
1357                 return 0;
1358         dom = isl_dim_unwrap(isl_dim_domain(isl_dim_copy(dim)));
1359         ran = isl_dim_unwrap(isl_dim_range(dim));
1360         dom_dom = isl_dim_domain(isl_dim_copy(dom));
1361         dom_ran = isl_dim_range(dom);
1362         ran_dom = isl_dim_domain(isl_dim_copy(ran));
1363         ran_ran = isl_dim_range(ran);
1364         dom = isl_dim_join(isl_dim_from_domain(dom_dom),
1365                            isl_dim_from_range(ran_dom));
1366         ran = isl_dim_join(isl_dim_from_domain(dom_ran),
1367                            isl_dim_from_range(ran_ran));
1368         return isl_dim_join(isl_dim_from_domain(isl_dim_wrap(dom)),
1369                             isl_dim_from_range(isl_dim_wrap(ran)));
1370 error:
1371         isl_dim_free(dim);
1372         return NULL;
1373 }
1374
1375 int isl_dim_has_named_params(__isl_keep isl_dim *dim)
1376 {
1377         int i;
1378         unsigned off;
1379
1380         if (!dim)
1381                 return -1;
1382         if (dim->nparam == 0)
1383                 return 1;
1384         off = isl_dim_offset(dim, isl_dim_param);
1385         if (off + dim->nparam > dim->n_id)
1386                 return 0;
1387         for (i = 0; i < dim->nparam; ++i)
1388                 if (!dim->ids[off + i])
1389                         return 0;
1390         return 1;
1391 }
1392
1393 /* Align the initial parameters of dim1 to match the order in dim2.
1394  */
1395 __isl_give isl_dim *isl_dim_align_params(__isl_take isl_dim *dim1,
1396         __isl_take isl_dim *dim2)
1397 {
1398         isl_reordering *exp;
1399
1400         if (!isl_dim_has_named_params(dim1) || !isl_dim_has_named_params(dim2))
1401                 isl_die(isl_dim_get_ctx(dim1), isl_error_invalid,
1402                         "parameter alignment requires named parameters",
1403                         goto error);
1404
1405         exp = isl_parameter_alignment_reordering(dim1, dim2);
1406         isl_dim_free(dim1);
1407         isl_dim_free(dim2);
1408         if (!exp)
1409                 return NULL;
1410         dim1 = isl_dim_copy(exp->dim);
1411         isl_reordering_free(exp);
1412         return dim1;
1413 error:
1414         isl_dim_free(dim1);
1415         isl_dim_free(dim2);
1416         return NULL;
1417 }