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 (!dim1 || !dim2)
 472                 return -1;
 473
 474         if (n(dim1, dim1_type) != n(dim2, dim2_type))
 475                 return 0;
 476         id1 = tuple_id(dim1, dim1_type);
 477         id2 = tuple_id(dim2, dim2_type);
 478         if (!id1 ^ !id2)
 479                 return 0;
 480         if (id1 && id1 != id2)
 481                 return 0;
 482         nested1 = nested(dim1, dim1_type);
 483         nested2 = nested(dim2, dim2_type);
 484         if (!nested1 ^ !nested2)
 485                 return 0;
 486         if (nested1 && !isl_dim_equal(nested1, nested2))
 487                 return 0;
 488         return 1;
 489 }
 490
 491 static int match(struct isl_dim *dim1, enum isl_dim_type dim1_type,
 492                 struct isl_dim *dim2, enum isl_dim_type dim2_type)
 493 {
 494         int i;
 495
 496         if (!isl_dim_tuple_match(dim1, dim1_type, dim2, dim2_type))
 497                 return 0;
 498
 499         if (!dim1->ids && !dim2->ids)
 500                 return 1;
 501
 502         for (i = 0; i < n(dim1, dim1_type); ++i) {
 503                 if (get_id(dim1, dim1_type, i) != get_id(dim2, dim2_type, i))
 504                         return 0;
 505         }
 506         return 1;
 507 }
 508
 509 int isl_dim_match(struct isl_dim *dim1, enum isl_dim_type dim1_type,
 510                 struct isl_dim *dim2, enum isl_dim_type dim2_type)
 511 {
 512         return match(dim1, dim1_type, dim2, dim2_type);
 513 }
 514
 515 static void get_ids(struct isl_dim *dim, enum isl_dim_type type,
 516         unsigned first, unsigned n, __isl_keep isl_id **ids)
 517 {
 518         int i;
 519
 520         for (i = 0; i < n ; ++i)
 521                 ids[i] = get_id(dim, type, first + i);
 522 }
 523
 524 struct isl_dim *isl_dim_extend(struct isl_dim *dim,
 525                         unsigned nparam, unsigned n_in, unsigned n_out)
 526 {
 527         isl_id **ids = NULL;
 528
 529         if (!dim)
 530                 return NULL;
 531         if (dim->nparam == nparam && dim->n_in == n_in && dim->n_out == n_out)
 532                 return dim;
 533
 534         isl_assert(dim->ctx, dim->nparam <= nparam, goto error);
 535         isl_assert(dim->ctx, dim->n_in <= n_in, goto error);
 536         isl_assert(dim->ctx, dim->n_out <= n_out, goto error);
 537
 538         dim = isl_dim_cow(dim);
 539
 540         if (dim->ids) {
 541                 ids = isl_calloc_array(dim->ctx, isl_id *,
 542                                          nparam + n_in + n_out);
 543                 if (!ids)
 544                         goto error;
 545                 get_ids(dim, isl_dim_param, 0, dim->nparam, ids);
 546                 get_ids(dim, isl_dim_in, 0, dim->n_in, ids + nparam);
 547                 get_ids(dim, isl_dim_out, 0, dim->n_out, ids + nparam + n_in);
 548                 free(dim->ids);
 549                 dim->ids = ids;
 550                 dim->n_id = nparam + n_in + n_out;
 551         }
 552         dim->nparam = nparam;
 553         dim->n_in = n_in;
 554         dim->n_out = n_out;
 555
 556         return dim;
 557 error:
 558         free(ids);
 559         isl_dim_free(dim);
 560         return NULL;
 561 }
 562
 563 struct isl_dim *isl_dim_add(struct isl_dim *dim, enum isl_dim_type type,
 564         unsigned n)
 565 {
 566         if (!dim)
 567                 return NULL;
 568         dim = isl_dim_reset(dim, type);
 569         switch (type) {
 570         case isl_dim_param:
 571                 dim = isl_dim_extend(dim,
 572                                         dim->nparam + n, dim->n_in, dim->n_out);
 573                 if (dim && dim->nested[0] &&
 574                     !(dim->nested[0] = isl_dim_add(dim->nested[0],
 575                                                     isl_dim_param, n)))
 576                         goto error;
 577                 if (dim && dim->nested[1] &&
 578                     !(dim->nested[1] = isl_dim_add(dim->nested[1],
 579                                                     isl_dim_param, n)))
 580                         goto error;
 581                 return dim;
 582         case isl_dim_in:
 583                 return isl_dim_extend(dim,
 584                                         dim->nparam, dim->n_in + n, dim->n_out);
 585         case isl_dim_out:
 586                 return isl_dim_extend(dim,
 587                                         dim->nparam, dim->n_in, dim->n_out + n);
 588         default:
 589                 isl_die(dim->ctx, isl_error_invalid,
 590                         "cannot add dimensions of specified type", goto error);
 591         }
 592 error:
 593         isl_dim_free(dim);
 594         return NULL;
 595 }
 596
 597 static int valid_dim_type(enum isl_dim_type type)
 598 {
 599         switch (type) {
 600         case isl_dim_param:
 601         case isl_dim_in:
 602         case isl_dim_out:
 603                 return 1;
 604         default:
 605                 return 0;
 606         }
 607 }
 608
 609 __isl_give isl_dim *isl_dim_insert(__isl_take isl_dim *dim,
 610         enum isl_dim_type type, unsigned pos, unsigned n)
 611 {
 612         isl_id **ids = NULL;
 613
 614         if (!dim)
 615                 return NULL;
 616         if (n == 0)
 617                 return isl_dim_reset(dim, type);
 618
 619         if (!valid_dim_type(type))
 620                 isl_die(dim->ctx, isl_error_invalid,
 621                         "cannot insert dimensions of specified type",
 622                         goto error);
 623
 624         isl_assert(dim->ctx, pos <= isl_dim_size(dim, type), goto error);
 625
 626         dim = isl_dim_cow(dim);
 627         if (!dim)
 628                 return NULL;
 629
 630         if (dim->ids) {
 631                 enum isl_dim_type t;
 632                 int off;
 633                 int s[3];
 634                 int *size = s - isl_dim_param;
 635                 ids = isl_calloc_array(dim->ctx, isl_id *,
 636                                      dim->nparam + dim->n_in + dim->n_out + n);
 637                 if (!ids)
 638                         goto error;
 639                 off = 0;
 640                 size[isl_dim_param] = dim->nparam;
 641                 size[isl_dim_in] = dim->n_in;
 642                 size[isl_dim_out] = dim->n_out;
 643                 for (t = isl_dim_param; t <= isl_dim_out; ++t) {
 644                         if (t != type) {
 645                                 get_ids(dim, t, 0, size[t], ids + off);
 646                                 off += size[t];
 647                         } else {
 648                                 get_ids(dim, t, 0, pos, ids + off);
 649                                 off += pos + n;
 650                                 get_ids(dim, t, pos, size[t] - pos, ids + off);
 651                                 off += size[t] - pos;
 652                         }
 653                 }
 654                 free(dim->ids);
 655                 dim->ids = ids;
 656                 dim->n_id = dim->nparam + dim->n_in + dim->n_out + n;
 657         }
 658         switch (type) {
 659         case isl_dim_param:     dim->nparam += n; break;
 660         case isl_dim_in:        dim->n_in += n; break;
 661         case isl_dim_out:       dim->n_out += n; break;
 662         default:                ;
 663         }
 664         dim = isl_dim_reset(dim, type);
 665
 666         return dim;
 667 error:
 668         isl_dim_free(dim);
 669         return NULL;
 670 }
 671
 672 __isl_give isl_dim *isl_dim_move(__isl_take isl_dim *dim,
 673         enum isl_dim_type dst_type, unsigned dst_pos,
 674         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 675 {
 676         int i;
 677
 678         if (!dim)
 679                 return NULL;
 680         if (n == 0)
 681                 return dim;
 682
 683         isl_assert(dim->ctx, src_pos + n <= isl_dim_size(dim, src_type),
 684                 goto error);
 685
 686         if (dst_type == src_type && dst_pos == src_pos)
 687                 return dim;
 688
 689         isl_assert(dim->ctx, dst_type != src_type, goto error);
 690
 691         dim = isl_dim_reset(dim, src_type);
 692         dim = isl_dim_reset(dim, dst_type);
 693
 694         dim = isl_dim_cow(dim);
 695         if (!dim)
 696                 return NULL;
 697
 698         if (dim->ids) {
 699                 isl_id **ids;
 700                 enum isl_dim_type t;
 701                 int off;
 702                 int s[3];
 703                 int *size = s - isl_dim_param;
 704                 ids = isl_calloc_array(dim->ctx, isl_id *,
 705                                          dim->nparam + dim->n_in + dim->n_out);
 706                 if (!ids)
 707                         goto error;
 708                 off = 0;
 709                 size[isl_dim_param] = dim->nparam;
 710                 size[isl_dim_in] = dim->n_in;
 711                 size[isl_dim_out] = dim->n_out;
 712                 for (t = isl_dim_param; t <= isl_dim_out; ++t) {
 713                         if (t == dst_type) {
 714                                 get_ids(dim, t, 0, dst_pos, ids + off);
 715                                 off += dst_pos;
 716                                 get_ids(dim, src_type, src_pos, n, ids + off);
 717                                 off += n;
 718                                 get_ids(dim, t, dst_pos, size[t] - dst_pos,
 719                                                 ids + off);
 720                                 off += size[t] - dst_pos;
 721                         } else if (t == src_type) {
 722                                 get_ids(dim, t, 0, src_pos, ids + off);
 723                                 off += src_pos;
 724                                 get_ids(dim, t, src_pos + n,
 725                                             size[t] - src_pos - n, ids + off);
 726                                 off += size[t] - src_pos - n;
 727                         } else {
 728                                 get_ids(dim, t, 0, size[t], ids + off);
 729                                 off += size[t];
 730                         }
 731                 }
 732                 free(dim->ids);
 733                 dim->ids = ids;
 734                 dim->n_id = dim->nparam + dim->n_in + dim->n_out;
 735         }
 736
 737         switch (dst_type) {
 738         case isl_dim_param:     dim->nparam += n; break;
 739         case isl_dim_in:        dim->n_in += n; break;
 740         case isl_dim_out:       dim->n_out += n; break;
 741         default:                ;
 742         }
 743
 744         switch (src_type) {
 745         case isl_dim_param:     dim->nparam -= n; break;
 746         case isl_dim_in:        dim->n_in -= n; break;
 747         case isl_dim_out:       dim->n_out -= n; break;
 748         default:                ;
 749         }
 750
 751         if (dst_type != isl_dim_param && src_type != isl_dim_param)
 752                 return dim;
 753
 754         for (i = 0; i < 2; ++i) {
 755                 if (!dim->nested[i])
 756                         continue;
 757                 dim->nested[i] = isl_dim_replace(dim->nested[i],
 758                                                  isl_dim_param, dim);
 759                 if (!dim->nested[i])
 760                         goto error;
 761         }
 762
 763         return dim;
 764 error:
 765         isl_dim_free(dim);
 766         return NULL;
 767 }
 768
 769 struct isl_dim *isl_dim_join(struct isl_dim *left, struct isl_dim *right)
 770 {
 771         struct isl_dim *dim;
 772
 773         if (!left || !right)
 774                 goto error;
 775
 776         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 777                         goto error);
 778         isl_assert(left->ctx,
 779                 isl_dim_tuple_match(left, isl_dim_out, right, isl_dim_in),
 780                 goto error);
 781
 782         dim = isl_dim_alloc(left->ctx, left->nparam, left->n_in, right->n_out);
 783         if (!dim)
 784                 goto error;
 785
 786         dim = copy_ids(dim, isl_dim_param, 0, left, isl_dim_param);
 787         dim = copy_ids(dim, isl_dim_in, 0, left, isl_dim_in);
 788         dim = copy_ids(dim, isl_dim_out, 0, right, isl_dim_out);
 789
 790         if (dim && left->tuple_id[0] &&
 791             !(dim->tuple_id[0] = isl_id_copy(left->tuple_id[0])))
 792                 goto error;
 793         if (dim && right->tuple_id[1] &&
 794             !(dim->tuple_id[1] = isl_id_copy(right->tuple_id[1])))
 795                 goto error;
 796         if (dim && left->nested[0] &&
 797             !(dim->nested[0] = isl_dim_copy(left->nested[0])))
 798                 goto error;
 799         if (dim && right->nested[1] &&
 800             !(dim->nested[1] = isl_dim_copy(right->nested[1])))
 801                 goto error;
 802
 803         isl_dim_free(left);
 804         isl_dim_free(right);
 805
 806         return dim;
 807 error:
 808         isl_dim_free(left);
 809         isl_dim_free(right);
 810         return NULL;
 811 }
 812
 813 struct isl_dim *isl_dim_product(struct isl_dim *left, struct isl_dim *right)
 814 {
 815         isl_dim *dom1, *dom2, *nest1, *nest2;
 816
 817         if (!left || !right)
 818                 goto error;
 819
 820         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 821                         goto error);
 822
 823         dom1 = isl_dim_domain(isl_dim_copy(left));
 824         dom2 = isl_dim_domain(isl_dim_copy(right));
 825         nest1 = isl_dim_wrap(isl_dim_join(isl_dim_reverse(dom1), dom2));
 826
 827         dom1 = isl_dim_range(left);
 828         dom2 = isl_dim_range(right);
 829         nest2 = isl_dim_wrap(isl_dim_join(isl_dim_reverse(dom1), dom2));
 830
 831         return isl_dim_join(isl_dim_reverse(nest1), nest2);
 832 error:
 833         isl_dim_free(left);
 834         isl_dim_free(right);
 835         return NULL;
 836 }
 837
 838 __isl_give isl_dim *isl_dim_range_product(__isl_take isl_dim *left,
 839         __isl_take isl_dim *right)
 840 {
 841         isl_dim *dom, *ran1, *ran2, *nest;
 842
 843         if (!left || !right)
 844                 goto error;
 845
 846         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 847                         goto error);
 848         if (!isl_dim_tuple_match(left, isl_dim_in, right, isl_dim_in))
 849                 isl_die(left->ctx, isl_error_invalid,
 850                         "domains need to match", goto error);
 851
 852         dom = isl_dim_domain(isl_dim_copy(left));
 853
 854         ran1 = isl_dim_range(left);
 855         ran2 = isl_dim_range(right);
 856         nest = isl_dim_wrap(isl_dim_join(isl_dim_reverse(ran1), ran2));
 857
 858         return isl_dim_join(isl_dim_reverse(dom), nest);
 859 error:
 860         isl_dim_free(left);
 861         isl_dim_free(right);
 862         return NULL;
 863 }
 864
 865 __isl_give isl_dim *isl_dim_map_from_set(__isl_take isl_dim *dim)
 866 {
 867         isl_id **ids = NULL;
 868
 869         if (!dim)
 870                 return NULL;
 871         isl_assert(dim->ctx, dim->n_in == 0, goto error);
 872         if (dim->n_out == 0 && !isl_dim_is_named_or_nested(dim, isl_dim_out))
 873                 return dim;
 874         dim = isl_dim_cow(dim);
 875         if (!dim)
 876                 return NULL;
 877         if (dim->ids) {
 878                 ids = isl_calloc_array(dim->ctx, isl_id *,
 879                                         dim->nparam + dim->n_out + dim->n_out);
 880                 if (!ids)
 881                         goto error;
 882                 get_ids(dim, isl_dim_param, 0, dim->nparam, ids);
 883                 get_ids(dim, isl_dim_out, 0, dim->n_out, ids + dim->nparam);
 884         }
 885         dim->n_in = dim->n_out;
 886         if (ids) {
 887                 free(dim->ids);
 888                 dim->ids = ids;
 889                 dim->n_id = dim->nparam + dim->n_out + dim->n_out;
 890                 dim = copy_ids(dim, isl_dim_out, 0, dim, isl_dim_in);
 891         }
 892         isl_id_free(dim->tuple_id[0]);
 893         dim->tuple_id[0] = isl_id_copy(dim->tuple_id[1]);
 894         isl_dim_free(dim->nested[0]);
 895         dim->nested[0] = isl_dim_copy(dim->nested[1]);
 896         return dim;
 897 error:
 898         isl_dim_free(dim);
 899         return NULL;
 900 }
 901
 902 static __isl_give isl_dim *set_ids(struct isl_dim *dim, enum isl_dim_type type,
 903         unsigned first, unsigned n, __isl_take isl_id **ids)
 904 {
 905         int i;
 906
 907         for (i = 0; i < n ; ++i)
 908                 dim = set_id(dim, type, first + i, ids[i]);
 909
 910         return dim;
 911 }
 912
 913 struct isl_dim *isl_dim_reverse(struct isl_dim *dim)
 914 {
 915         unsigned t;
 916         isl_dim *nested;
 917         isl_id **ids = NULL;
 918         isl_id *id;
 919
 920         if (!dim)
 921                 return NULL;
 922         if (match(dim, isl_dim_in, dim, isl_dim_out))
 923                 return dim;
 924
 925         dim = isl_dim_cow(dim);
 926         if (!dim)
 927                 return NULL;
 928
 929         id = dim->tuple_id[0];
 930         dim->tuple_id[0] = dim->tuple_id[1];
 931         dim->tuple_id[1] = id;
 932
 933         nested = dim->nested[0];
 934         dim->nested[0] = dim->nested[1];
 935         dim->nested[1] = nested;
 936
 937         if (dim->ids) {
 938                 ids = isl_alloc_array(dim->ctx, isl_id *,
 939                                         dim->n_in + dim->n_out);
 940                 if (!ids)
 941                         goto error;
 942                 get_ids(dim, isl_dim_in, 0, dim->n_in, ids);
 943                 get_ids(dim, isl_dim_out, 0, dim->n_out, ids + dim->n_in);
 944         }
 945
 946         t = dim->n_in;
 947         dim->n_in = dim->n_out;
 948         dim->n_out = t;
 949
 950         if (dim->ids) {
 951                 dim = set_ids(dim, isl_dim_out, 0, dim->n_out, ids);
 952                 dim = set_ids(dim, isl_dim_in, 0, dim->n_in, ids + dim->n_out);
 953                 free(ids);
 954         }
 955
 956         return dim;
 957 error:
 958         free(ids);
 959         isl_dim_free(dim);
 960         return NULL;
 961 }
 962
 963 struct isl_dim *isl_dim_drop(struct isl_dim *dim, enum isl_dim_type type,
 964                 unsigned first, unsigned num)
 965 {
 966         int i;
 967
 968         if (!dim)
 969                 return NULL;
 970
 971         if (num == 0)
 972                 return isl_dim_reset(dim, type);
 973
 974         if (!valid_dim_type(type))
 975                 isl_die(dim->ctx, isl_error_invalid,
 976                         "cannot drop dimensions of specified type", goto error);
 977
 978         isl_assert(dim->ctx, first + num <= n(dim, type), goto error);
 979         dim = isl_dim_cow(dim);
 980         if (!dim)
 981                 goto error;
 982         if (dim->ids) {
 983                 dim = extend_ids(dim);
 984                 if (!dim)
 985                         goto error;
 986                 for (i = 0; i < num; ++i)
 987                         isl_id_free(get_id(dim, type, first + i));
 988                 for (i = first+num; i < n(dim, type); ++i)
 989                         set_id(dim, type, i - num, get_id(dim, type, i));
 990                 switch (type) {
 991                 case isl_dim_param:
 992                         get_ids(dim, isl_dim_in, 0, dim->n_in,
 993                                 dim->ids + offset(dim, isl_dim_in) - num);
 994                 case isl_dim_in:
 995                         get_ids(dim, isl_dim_out, 0, dim->n_out,
 996                                 dim->ids + offset(dim, isl_dim_out) - num);
 997                 default:
 998                         ;
 999                 }
1000                 dim->n_id -= num;
1001         }
1002         switch (type) {
1003         case isl_dim_param:     dim->nparam -= num; break;
1004         case isl_dim_in:        dim->n_in -= num; break;
1005         case isl_dim_out:       dim->n_out -= num; break;
1006         default:                ;
1007         }
1008         dim = isl_dim_reset(dim, type);
1009         if (type == isl_dim_param) {
1010                 if (dim && dim->nested[0] &&
1011                     !(dim->nested[0] = isl_dim_drop(dim->nested[0],
1012                                                     isl_dim_param, first, num)))
1013                         goto error;
1014                 if (dim && dim->nested[1] &&
1015                     !(dim->nested[1] = isl_dim_drop(dim->nested[1],
1016                                                     isl_dim_param, first, num)))
1017                         goto error;
1018         }
1019         return dim;
1020 error:
1021         isl_dim_free(dim);
1022         return NULL;
1023 }
1024
1025 struct isl_dim *isl_dim_drop_inputs(struct isl_dim *dim,
1026                 unsigned first, unsigned n)
1027 {
1028         if (!dim)
1029                 return NULL;
1030         return isl_dim_drop(dim, isl_dim_in, first, n);
1031 }
1032
1033 struct isl_dim *isl_dim_drop_outputs(struct isl_dim *dim,
1034                 unsigned first, unsigned n)
1035 {
1036         if (!dim)
1037                 return NULL;
1038         return isl_dim_drop(dim, isl_dim_out, first, n);
1039 }
1040
1041 struct isl_dim *isl_dim_domain(struct isl_dim *dim)
1042 {
1043         if (!dim)
1044                 return NULL;
1045         dim = isl_dim_drop_outputs(dim, 0, dim->n_out);
1046         return isl_dim_reverse(dim);
1047 }
1048
1049 __isl_give isl_dim *isl_dim_from_domain(__isl_take isl_dim *dim)
1050 {
1051         return isl_dim_reverse(dim);
1052 }
1053
1054 struct isl_dim *isl_dim_range(struct isl_dim *dim)
1055 {
1056         if (!dim)
1057                 return NULL;
1058         return isl_dim_drop_inputs(dim, 0, dim->n_in);
1059 }
1060
1061 __isl_give isl_dim *isl_dim_from_range(__isl_take isl_dim *dim)
1062 {
1063         return dim;
1064 }
1065
1066 __isl_give isl_dim *isl_dim_as_set_dim(__isl_take isl_dim *dim)
1067 {
1068         dim = isl_dim_cow(dim);
1069         if (!dim)
1070                 return NULL;
1071
1072         dim->n_out += dim->n_in;
1073         dim->n_in = 0;
1074         dim = isl_dim_reset(dim, isl_dim_in);
1075         dim = isl_dim_reset(dim, isl_dim_out);
1076
1077         return dim;
1078 }
1079
1080 struct isl_dim *isl_dim_underlying(struct isl_dim *dim, unsigned n_div)
1081 {
1082         int i;
1083
1084         if (!dim)
1085                 return NULL;
1086         if (n_div == 0 &&
1087             dim->nparam == 0 && dim->n_in == 0 && dim->n_id == 0)
1088                 return isl_dim_reset(isl_dim_reset(dim, isl_dim_in), isl_dim_out);
1089         dim = isl_dim_cow(dim);
1090         if (!dim)
1091                 return NULL;
1092         dim->n_out += dim->nparam + dim->n_in + n_div;
1093         dim->nparam = 0;
1094         dim->n_in = 0;
1095
1096         for (i = 0; i < dim->n_id; ++i)
1097                 isl_id_free(get_id(dim, isl_dim_out, i));
1098         dim->n_id = 0;
1099         dim = isl_dim_reset(dim, isl_dim_in);
1100         dim = isl_dim_reset(dim, isl_dim_out);
1101
1102         return dim;
1103 }
1104
1105 unsigned isl_dim_total(struct isl_dim *dim)
1106 {
1107         return dim ? dim->nparam + dim->n_in + dim->n_out : 0;
1108 }
1109
1110 int isl_dim_equal(struct isl_dim *dim1, struct isl_dim *dim2)
1111 {
1112         if (!dim1 || !dim2)
1113                 return -1;
1114         return match(dim1, isl_dim_param, dim2, isl_dim_param) &&
1115                isl_dim_tuple_match(dim1, isl_dim_in, dim2, isl_dim_in) &&
1116                isl_dim_tuple_match(dim1, isl_dim_out, dim2, isl_dim_out);
1117 }
1118
1119 int isl_dim_compatible(struct isl_dim *dim1, struct isl_dim *dim2)
1120 {
1121         return dim1->nparam == dim2->nparam &&
1122                dim1->n_in + dim1->n_out == dim2->n_in + dim2->n_out;
1123 }
1124
1125 static uint32_t isl_hash_dim(uint32_t hash, __isl_keep isl_dim *dim)
1126 {
1127         int i;
1128         isl_id *id;
1129
1130         if (!dim)
1131                 return hash;
1132
1133         hash = isl_hash_builtin(hash, dim->nparam);
1134         hash = isl_hash_builtin(hash, dim->n_in);
1135         hash = isl_hash_builtin(hash, dim->n_out);
1136
1137         for (i = 0; i < dim->nparam; ++i) {
1138                 id = get_id(dim, isl_dim_param, i);
1139                 hash = isl_hash_id(hash, id);
1140         }
1141
1142         id = tuple_id(dim, isl_dim_in);
1143         hash = isl_hash_id(hash, id);
1144         id = tuple_id(dim, isl_dim_out);
1145         hash = isl_hash_id(hash, id);
1146
1147         hash = isl_hash_dim(hash, dim->nested[0]);
1148         hash = isl_hash_dim(hash, dim->nested[1]);
1149
1150         return hash;
1151 }
1152
1153 uint32_t isl_dim_get_hash(__isl_keep isl_dim *dim)
1154 {
1155         uint32_t hash;
1156
1157         if (!dim)
1158                 return 0;
1159
1160         hash = isl_hash_init();
1161         hash = isl_hash_dim(hash, dim);
1162
1163         return hash;
1164 }
1165
1166 int isl_dim_is_wrapping(__isl_keep isl_dim *dim)
1167 {
1168         if (!dim)
1169                 return -1;
1170
1171         if (dim->n_in != 0 || dim->tuple_id[0] || dim->nested[0])
1172                 return 0;
1173
1174         return dim->nested[1] != NULL;
1175 }
1176
1177 __isl_give isl_dim *isl_dim_wrap(__isl_take isl_dim *dim)
1178 {
1179         isl_dim *wrap;
1180
1181         if (!dim)
1182                 return NULL;
1183
1184         wrap = isl_dim_alloc(dim->ctx, dim->nparam, 0, dim->n_in + dim->n_out);
1185
1186         wrap = copy_ids(wrap, isl_dim_param, 0, dim, isl_dim_param);
1187         wrap = copy_ids(wrap, isl_dim_set, 0, dim, isl_dim_in);
1188         wrap = copy_ids(wrap, isl_dim_set, dim->n_in, dim, isl_dim_out);
1189
1190         if (!wrap)
1191                 goto error;
1192
1193         wrap->nested[1] = dim;
1194
1195         return wrap;
1196 error:
1197         isl_dim_free(dim);
1198         return NULL;
1199 }
1200
1201 __isl_give isl_dim *isl_dim_unwrap(__isl_take isl_dim *dim)
1202 {
1203         isl_dim *unwrap;
1204
1205         if (!dim)
1206                 return NULL;
1207
1208         if (!isl_dim_is_wrapping(dim))
1209                 isl_die(dim->ctx, isl_error_invalid, "not a wrapping dim",
1210                         goto error);
1211
1212         unwrap = isl_dim_copy(dim->nested[1]);
1213         isl_dim_free(dim);
1214
1215         return unwrap;
1216 error:
1217         isl_dim_free(dim);
1218         return NULL;
1219 }
1220
1221 int isl_dim_is_named_or_nested(__isl_keep isl_dim *dim, enum isl_dim_type type)
1222 {
1223         if (type != isl_dim_in && type != isl_dim_out)
1224                 return 0;
1225         if (!dim)
1226                 return -1;
1227         if (dim->tuple_id[type - isl_dim_in])
1228                 return 1;
1229         if (dim->nested[type - isl_dim_in])
1230                 return 1;
1231         return 0;
1232 }
1233
1234 int isl_dim_may_be_set(__isl_keep isl_dim *dim)
1235 {
1236         if (!dim)
1237                 return -1;
1238         if (isl_dim_size(dim, isl_dim_in) != 0)
1239                 return 0;
1240         if (isl_dim_is_named_or_nested(dim, isl_dim_in))
1241                 return 0;
1242         return 1;
1243 }
1244
1245 __isl_give isl_dim *isl_dim_reset(__isl_take isl_dim *dim,
1246         enum isl_dim_type type)
1247 {
1248         if (!isl_dim_is_named_or_nested(dim, type))
1249                 return dim;
1250
1251         dim = isl_dim_cow(dim);
1252         if (!dim)
1253                 return NULL;
1254
1255         isl_id_free(dim->tuple_id[type - isl_dim_in]);
1256         dim->tuple_id[type - isl_dim_in] = NULL;
1257         isl_dim_free(dim->nested[type - isl_dim_in]);
1258         dim->nested[type - isl_dim_in] = NULL;
1259
1260         return dim;
1261 }
1262
1263 __isl_give isl_dim *isl_dim_flatten(__isl_take isl_dim *dim)
1264 {
1265         if (!dim)
1266                 return NULL;
1267         if (!dim->nested[0] && !dim->nested[1])
1268                 return dim;
1269
1270         if (dim->nested[0])
1271                 dim = isl_dim_reset(dim, isl_dim_in);
1272         if (dim && dim->nested[1])
1273                 dim = isl_dim_reset(dim, isl_dim_out);
1274
1275         return dim;
1276 }
1277
1278 __isl_give isl_dim *isl_dim_flatten_range(__isl_take isl_dim *dim)
1279 {
1280         if (!dim)
1281                 return NULL;
1282         if (!dim->nested[1])
1283                 return dim;
1284
1285         return isl_dim_reset(dim, isl_dim_out);
1286 }
1287
1288 /* Replace the dimensions of the given type of dst by those of src.
1289  */
1290 __isl_give isl_dim *isl_dim_replace(__isl_take isl_dim *dst,
1291         enum isl_dim_type type, __isl_keep isl_dim *src)
1292 {
1293         dst = isl_dim_cow(dst);
1294
1295         if (!dst || !src)
1296                 goto error;
1297
1298         dst = isl_dim_drop(dst, type, 0, isl_dim_size(dst, type));
1299         dst = isl_dim_add(dst, type, isl_dim_size(src, type));
1300         dst = copy_ids(dst, type, 0, src, type);
1301
1302         if (dst && type == isl_dim_param) {
1303                 int i;
1304                 for (i = 0; i <= 1; ++i) {
1305                         if (!dst->nested[i])
1306                                 continue;
1307                         dst->nested[i] = isl_dim_replace(dst->nested[i],
1308                                                          type, src);
1309                         if (!dst->nested[i])
1310                                 goto error;
1311                 }
1312         }
1313
1314         return dst;
1315 error:
1316         isl_dim_free(dst);
1317         return NULL;
1318 }
1319
1320 /* Given a dimension specification "dim" of a set, create a dimension
1321  * specification for the lift of the set.  In particular, the result
1322  * is of the form [dim -> local[..]], with n_local variables in the
1323  * range of the wrapped map.
1324  */
1325 __isl_give isl_dim *isl_dim_lift(__isl_take isl_dim *dim, unsigned n_local)
1326 {
1327         isl_dim *local_dim;
1328
1329         if (!dim)
1330                 return NULL;
1331
1332         local_dim = isl_dim_dup(dim);
1333         local_dim = isl_dim_drop(local_dim, isl_dim_set, 0, dim->n_out);
1334         local_dim = isl_dim_add(local_dim, isl_dim_set, n_local);
1335         local_dim = isl_dim_set_tuple_name(local_dim, isl_dim_set, "local");
1336         dim = isl_dim_join(isl_dim_from_domain(dim),
1337                             isl_dim_from_range(local_dim));
1338         dim = isl_dim_wrap(dim);
1339         dim = isl_dim_set_tuple_name(dim, isl_dim_set, "lifted");
1340
1341         return dim;
1342 }
1343
1344 int isl_dim_can_zip(__isl_keep isl_dim *dim)
1345 {
1346         if (!dim)
1347                 return -1;
1348
1349         return dim->nested[0] && dim->nested[1];
1350 }
1351
1352 __isl_give isl_dim *isl_dim_zip(__isl_take isl_dim *dim)
1353 {
1354         isl_dim *dom, *ran;
1355         isl_dim *dom_dom, *dom_ran, *ran_dom, *ran_ran;
1356
1357         if (!isl_dim_can_zip(dim))
1358                 isl_die(dim->ctx, isl_error_invalid, "dim cannot be zipped",
1359                         goto error);
1360
1361         if (!dim)
1362                 return 0;
1363         dom = isl_dim_unwrap(isl_dim_domain(isl_dim_copy(dim)));
1364         ran = isl_dim_unwrap(isl_dim_range(dim));
1365         dom_dom = isl_dim_domain(isl_dim_copy(dom));
1366         dom_ran = isl_dim_range(dom);
1367         ran_dom = isl_dim_domain(isl_dim_copy(ran));
1368         ran_ran = isl_dim_range(ran);
1369         dom = isl_dim_join(isl_dim_from_domain(dom_dom),
1370                            isl_dim_from_range(ran_dom));
1371         ran = isl_dim_join(isl_dim_from_domain(dom_ran),
1372                            isl_dim_from_range(ran_ran));
1373         return isl_dim_join(isl_dim_from_domain(isl_dim_wrap(dom)),
1374                             isl_dim_from_range(isl_dim_wrap(ran)));
1375 error:
1376         isl_dim_free(dim);
1377         return NULL;
1378 }
1379
1380 int isl_dim_has_named_params(__isl_keep isl_dim *dim)
1381 {
1382         int i;
1383         unsigned off;
1384
1385         if (!dim)
1386                 return -1;
1387         if (dim->nparam == 0)
1388                 return 1;
1389         off = isl_dim_offset(dim, isl_dim_param);
1390         if (off + dim->nparam > dim->n_id)
1391                 return 0;
1392         for (i = 0; i < dim->nparam; ++i)
1393                 if (!dim->ids[off + i])
1394                         return 0;
1395         return 1;
1396 }
1397
1398 /* Align the initial parameters of dim1 to match the order in dim2.
1399  */
1400 __isl_give isl_dim *isl_dim_align_params(__isl_take isl_dim *dim1,
1401         __isl_take isl_dim *dim2)
1402 {
1403         isl_reordering *exp;
1404
1405         if (!isl_dim_has_named_params(dim1) || !isl_dim_has_named_params(dim2))
1406                 isl_die(isl_dim_get_ctx(dim1), isl_error_invalid,
1407                         "parameter alignment requires named parameters",
1408                         goto error);
1409
1410         exp = isl_parameter_alignment_reordering(dim1, dim2);
1411         isl_dim_free(dim1);
1412         isl_dim_free(dim2);
1413         if (!exp)
1414                 return NULL;
1415         dim1 = isl_dim_copy(exp->dim);
1416         isl_reordering_free(exp);
1417         return dim1;
1418 error:
1419         isl_dim_free(dim1);
1420         isl_dim_free(dim2);
1421         return NULL;
1422 }