isl_dim.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 license
   5  *
   6  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   7  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   8  */
   9
  10 #include <isl_dim_private.h>
  11 #include "isl_name.h"
  12
  13 struct isl_dim *isl_dim_alloc(struct isl_ctx *ctx,
  14                         unsigned nparam, unsigned n_in, unsigned n_out)
  15 {
  16         struct isl_dim *dim;
  17
  18         dim = isl_alloc_type(ctx, struct isl_dim);
  19         if (!dim)
  20                 return NULL;
  21
  22         dim->ctx = ctx;
  23         isl_ctx_ref(ctx);
  24         dim->ref = 1;
  25         dim->nparam = nparam;
  26         dim->n_in = n_in;
  27         dim->n_out = n_out;
  28
  29         dim->n_name = 0;
  30         dim->names = NULL;
  31
  32         return dim;
  33 }
  34
  35 struct isl_dim *isl_dim_set_alloc(struct isl_ctx *ctx,
  36                         unsigned nparam, unsigned dim)
  37 {
  38         return isl_dim_alloc(ctx, nparam, 0, dim);
  39 }
  40
  41 static unsigned global_pos(struct isl_dim *dim,
  42                                  enum isl_dim_type type, unsigned pos)
  43 {
  44         struct isl_ctx *ctx = dim->ctx;
  45
  46         switch (type) {
  47         case isl_dim_param:
  48                 isl_assert(ctx, pos < dim->nparam, return isl_dim_total(dim));
  49                 return pos;
  50         case isl_dim_in:
  51                 isl_assert(ctx, pos < dim->n_in, return isl_dim_total(dim));
  52                 return pos + dim->nparam;
  53         case isl_dim_out:
  54                 isl_assert(ctx, pos < dim->n_out, return isl_dim_total(dim));
  55                 return pos + dim->nparam + dim->n_in;
  56         default:
  57                 isl_assert(ctx, 0, return isl_dim_total(dim));
  58         }
  59         return isl_dim_total(dim);
  60 }
  61
  62 /* Extend length of names array to the total number of dimensions.
  63  */
  64 static __isl_give isl_dim *extend_names(__isl_take isl_dim *dim)
  65 {
  66         struct isl_name **names;
  67         int i;
  68
  69         if (isl_dim_total(dim) <= dim->n_name)
  70                 return dim;
  71
  72         if (!dim->names) {
  73                 dim->names = isl_calloc_array(dim->ctx,
  74                                 struct isl_name *, isl_dim_total(dim));
  75                 if (!dim->names)
  76                         goto error;
  77         } else {
  78                 names = isl_realloc_array(dim->ctx, dim->names,
  79                                 struct isl_name *, isl_dim_total(dim));
  80                 if (!names)
  81                         goto error;
  82                 dim->names = names;
  83                 for (i = dim->n_name; i < isl_dim_total(dim); ++i)
  84                         dim->names[i] = NULL;
  85         }
  86
  87         dim->n_name = isl_dim_total(dim);
  88
  89         return dim;
  90 error:
  91         isl_dim_free(dim);
  92         return NULL;
  93 }
  94
  95 static struct isl_dim *set_name(struct isl_dim *dim,
  96                                  enum isl_dim_type type, unsigned pos,
  97                                  struct isl_name *name)
  98 {
  99         struct isl_ctx *ctx = dim->ctx;
 100         dim = isl_dim_cow(dim);
 101
 102         if (!dim)
 103                 goto error;
 104
 105         pos = global_pos(dim, type, pos);
 106         isl_assert(ctx, pos != isl_dim_total(dim), goto error);
 107
 108         if (pos >= dim->n_name) {
 109                 if (!name)
 110                         return dim;
 111                 dim = extend_names(dim);
 112                 if (!dim)
 113                         goto error;
 114         }
 115
 116         dim->names[pos] = name;
 117
 118         return dim;
 119 error:
 120         isl_name_free(ctx, name);
 121         isl_dim_free(dim);
 122         return NULL;
 123 }
 124
 125 static struct isl_name *get_name(struct isl_dim *dim,
 126                                  enum isl_dim_type type, unsigned pos)
 127 {
 128         if (!dim)
 129                 return NULL;
 130
 131         pos = global_pos(dim, type, pos);
 132         if (pos == isl_dim_total(dim))
 133                 return NULL;
 134         if (pos >= dim->n_name)
 135                 return NULL;
 136         return dim->names[pos];
 137 }
 138
 139 static unsigned offset(struct isl_dim *dim, enum isl_dim_type type)
 140 {
 141         switch (type) {
 142         case isl_dim_param:     return 0;
 143         case isl_dim_in:        return dim->nparam;
 144         case isl_dim_out:       return dim->nparam + dim->n_in;
 145         }
 146 }
 147
 148 static unsigned n(struct isl_dim *dim, enum isl_dim_type type)
 149 {
 150         switch (type) {
 151         case isl_dim_param:     return dim->nparam;
 152         case isl_dim_in:        return dim->n_in;
 153         case isl_dim_out:       return dim->n_out;
 154         }
 155 }
 156
 157 unsigned isl_dim_size(struct isl_dim *dim, enum isl_dim_type type)
 158 {
 159         if (!dim)
 160                 return 0;
 161         return n(dim, type);
 162 }
 163
 164 static struct isl_dim *copy_names(struct isl_dim *dst,
 165         enum isl_dim_type dst_type, unsigned offset, struct isl_dim *src,
 166         enum isl_dim_type src_type)
 167 {
 168         int i;
 169         struct isl_name *name;
 170
 171         for (i = 0; i < n(src, src_type); ++i) {
 172                 name = get_name(src, src_type, i);
 173                 if (!name)
 174                         continue;
 175                 dst = set_name(dst, dst_type, offset + i,
 176                                         isl_name_copy(dst->ctx, name));
 177                 if (!dst)
 178                         return NULL;
 179         }
 180         return dst;
 181 }
 182
 183 struct isl_dim *isl_dim_dup(struct isl_dim *dim)
 184 {
 185         struct isl_dim *dup;
 186         dup = isl_dim_alloc(dim->ctx, dim->nparam, dim->n_in, dim->n_out);
 187         if (!dim->names)
 188                 return dup;
 189         dup = copy_names(dup, isl_dim_param, 0, dim, isl_dim_param);
 190         dup = copy_names(dup, isl_dim_in, 0, dim, isl_dim_in);
 191         dup = copy_names(dup, isl_dim_out, 0, dim, isl_dim_out);
 192         return dup;
 193 }
 194
 195 struct isl_dim *isl_dim_cow(struct isl_dim *dim)
 196 {
 197         if (!dim)
 198                 return NULL;
 199
 200         if (dim->ref == 1)
 201                 return dim;
 202         dim->ref--;
 203         return isl_dim_dup(dim);
 204 }
 205
 206 struct isl_dim *isl_dim_copy(struct isl_dim *dim)
 207 {
 208         if (!dim)
 209                 return NULL;
 210
 211         dim->ref++;
 212         return dim;
 213 }
 214
 215 void isl_dim_free(struct isl_dim *dim)
 216 {
 217         int i;
 218
 219         if (!dim)
 220                 return;
 221
 222         if (--dim->ref > 0)
 223                 return;
 224
 225         for (i = 0; i < dim->n_name; ++i)
 226                 isl_name_free(dim->ctx, dim->names[i]);
 227         free(dim->names);
 228         isl_ctx_deref(dim->ctx);
 229
 230         free(dim);
 231 }
 232
 233 struct isl_dim *isl_dim_set_name(struct isl_dim *dim,
 234                                  enum isl_dim_type type, unsigned pos,
 235                                  const char *s)
 236 {
 237         struct isl_name *name;
 238         if (!dim)
 239                 return NULL;
 240         name = isl_name_get(dim->ctx, s);
 241         if (!name)
 242                 goto error;
 243         return set_name(dim, type, pos, name);
 244 error:
 245         isl_dim_free(dim);
 246         return NULL;
 247 }
 248
 249 const char *isl_dim_get_name(struct isl_dim *dim,
 250                                  enum isl_dim_type type, unsigned pos)
 251 {
 252         struct isl_name *name = get_name(dim, type, pos);
 253         return name ? name->name : NULL;
 254 }
 255
 256 static int match(struct isl_dim *dim1, enum isl_dim_type dim1_type,
 257                 struct isl_dim *dim2, enum isl_dim_type dim2_type)
 258 {
 259         int i;
 260
 261         if (n(dim1, dim1_type) != n(dim2, dim2_type))
 262                 return 0;
 263
 264         if (!dim1->names && !dim2->names)
 265                 return 1;
 266
 267         for (i = 0; i < n(dim1, dim1_type); ++i) {
 268                 if (get_name(dim1, dim1_type, i) !=
 269                     get_name(dim2, dim2_type, i))
 270                         return 0;
 271         }
 272         return 1;
 273 }
 274
 275 int isl_dim_match(struct isl_dim *dim1, enum isl_dim_type dim1_type,
 276                 struct isl_dim *dim2, enum isl_dim_type dim2_type)
 277 {
 278         return match(dim1, dim1_type, dim2, dim2_type);
 279 }
 280
 281 static void get_names(struct isl_dim *dim, enum isl_dim_type type,
 282         unsigned first, unsigned n, struct isl_name **names)
 283 {
 284         int i;
 285
 286         for (i = 0; i < n ; ++i)
 287                 names[i] = get_name(dim, type, first+i);
 288 }
 289
 290 struct isl_dim *isl_dim_extend(struct isl_dim *dim,
 291                         unsigned nparam, unsigned n_in, unsigned n_out)
 292 {
 293         struct isl_name **names = NULL;
 294
 295         if (!dim)
 296                 return NULL;
 297         if (dim->nparam == nparam && dim->n_in == n_in && dim->n_out == n_out)
 298                 return dim;
 299
 300         isl_assert(dim->ctx, dim->nparam <= nparam, goto error);
 301         isl_assert(dim->ctx, dim->n_in <= n_in, goto error);
 302         isl_assert(dim->ctx, dim->n_out <= n_out, goto error);
 303
 304         dim = isl_dim_cow(dim);
 305
 306         if (dim->names) {
 307                 names = isl_calloc_array(dim->ctx, struct isl_name *,
 308                                          nparam + n_in + n_out);
 309                 if (!names)
 310                         goto error;
 311                 get_names(dim, isl_dim_param, 0, dim->nparam, names);
 312                 get_names(dim, isl_dim_in, 0, dim->n_in, names + nparam);
 313                 get_names(dim, isl_dim_out, 0, dim->n_out,
 314                                 names + nparam + n_in);
 315                 free(dim->names);
 316                 dim->names = names;
 317                 dim->n_name = nparam + n_in + n_out;
 318         }
 319         dim->nparam = nparam;
 320         dim->n_in = n_in;
 321         dim->n_out = n_out;
 322
 323         return dim;
 324 error:
 325         free(names);
 326         isl_dim_free(dim);
 327         return NULL;
 328 }
 329
 330 struct isl_dim *isl_dim_add(struct isl_dim *dim, enum isl_dim_type type,
 331         unsigned n)
 332 {
 333         switch (type) {
 334         case isl_dim_param:
 335                 return isl_dim_extend(dim,
 336                                         dim->nparam + n, dim->n_in, dim->n_out);
 337         case isl_dim_in:
 338                 return isl_dim_extend(dim,
 339                                         dim->nparam, dim->n_in + n, dim->n_out);
 340         case isl_dim_out:
 341                 return isl_dim_extend(dim,
 342                                         dim->nparam, dim->n_in, dim->n_out + n);
 343         }
 344         return dim;
 345 }
 346
 347 __isl_give isl_dim *isl_dim_move(__isl_take isl_dim *dim,
 348         enum isl_dim_type dst_type, unsigned dst_pos,
 349         enum isl_dim_type src_type, unsigned src_pos, unsigned n)
 350 {
 351         if (!dim)
 352                 return NULL;
 353         if (n == 0)
 354                 return dim;
 355
 356         isl_assert(dim->ctx, src_pos + n <= isl_dim_size(dim, src_type),
 357                 goto error);
 358
 359         /* just the simple case for now */
 360         isl_assert(dim->ctx,
 361                 offset(dim, dst_type) + dst_pos ==
 362                 offset(dim, src_type) + src_pos + ((src_type < dst_type) ? n : 0),
 363                 goto error);
 364
 365         if (dst_type == src_type)
 366                 return dim;
 367
 368         dim = isl_dim_cow(dim);
 369         if (!dim)
 370                 return NULL;
 371
 372         switch (dst_type) {
 373         case isl_dim_param:     dim->nparam += n; break;
 374         case isl_dim_in:        dim->n_in += n; break;
 375         case isl_dim_out:       dim->n_out += n; break;
 376         }
 377
 378         switch (src_type) {
 379         case isl_dim_param:     dim->nparam -= n; break;
 380         case isl_dim_in:        dim->n_in -= n; break;
 381         case isl_dim_out:       dim->n_out -= n; break;
 382         }
 383
 384         return dim;
 385 error:
 386         isl_dim_free(dim);
 387         return NULL;
 388 }
 389
 390 struct isl_dim *isl_dim_join(struct isl_dim *left, struct isl_dim *right)
 391 {
 392         struct isl_dim *dim;
 393
 394         if (!left || !right)
 395                 goto error;
 396
 397         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 398                         goto error);
 399         isl_assert(left->ctx, n(left, isl_dim_out) == n(right, isl_dim_in),
 400                         goto error);
 401
 402         dim = isl_dim_alloc(left->ctx, left->nparam, left->n_in, right->n_out);
 403         if (!dim)
 404                 goto error;
 405
 406         dim = copy_names(dim, isl_dim_param, 0, left, isl_dim_param);
 407         dim = copy_names(dim, isl_dim_in, 0, left, isl_dim_in);
 408         dim = copy_names(dim, isl_dim_out, 0, right, isl_dim_out);
 409
 410         isl_dim_free(left);
 411         isl_dim_free(right);
 412
 413         return dim;
 414 error:
 415         isl_dim_free(left);
 416         isl_dim_free(right);
 417         return NULL;
 418 }
 419
 420 struct isl_dim *isl_dim_product(struct isl_dim *left, struct isl_dim *right)
 421 {
 422         struct isl_dim *dim;
 423
 424         if (!left || !right)
 425                 goto error;
 426
 427         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 428                         goto error);
 429
 430         dim = isl_dim_alloc(left->ctx, left->nparam,
 431                         left->n_in + right->n_in, left->n_out + right->n_out);
 432         if (!dim)
 433                 goto error;
 434
 435         dim = copy_names(dim, isl_dim_param, 0, left, isl_dim_param);
 436         dim = copy_names(dim, isl_dim_in, 0, left, isl_dim_in);
 437         dim = copy_names(dim, isl_dim_in, left->n_in, right, isl_dim_in);
 438         dim = copy_names(dim, isl_dim_out, 0, left, isl_dim_out);
 439         dim = copy_names(dim, isl_dim_out, left->n_out, right, isl_dim_out);
 440
 441         isl_dim_free(left);
 442         isl_dim_free(right);
 443
 444         return dim;
 445 error:
 446         isl_dim_free(left);
 447         isl_dim_free(right);
 448         return NULL;
 449 }
 450
 451 struct isl_dim *isl_dim_map(struct isl_dim *dim)
 452 {
 453         struct isl_name **names = NULL;
 454
 455         if (!dim)
 456                 return NULL;
 457         isl_assert(dim->ctx, dim->n_in == 0, goto error);
 458         if (dim->n_out == 0)
 459                 return dim;
 460         dim = isl_dim_cow(dim);
 461         if (!dim)
 462                 return NULL;
 463         if (dim->names) {
 464                 names = isl_calloc_array(dim->ctx, struct isl_name *,
 465                                         dim->nparam + dim->n_out + dim->n_out);
 466                 if (!names)
 467                         goto error;
 468                 get_names(dim, isl_dim_param, 0, dim->nparam, names);
 469                 get_names(dim, isl_dim_out, 0, dim->n_out, names + dim->nparam);
 470         }
 471         dim->n_in = dim->n_out;
 472         if (names) {
 473                 free(dim->names);
 474                 dim->names = names;
 475                 dim->n_name = dim->nparam + dim->n_out + dim->n_out;
 476                 dim = copy_names(dim, isl_dim_out, 0, dim, isl_dim_in);
 477         }
 478         return dim;
 479 error:
 480         isl_dim_free(dim);
 481         return NULL;
 482 }
 483
 484 static struct isl_dim *set_names(struct isl_dim *dim, enum isl_dim_type type,
 485         unsigned first, unsigned n, struct isl_name **names)
 486 {
 487         int i;
 488
 489         for (i = 0; i < n ; ++i)
 490                 dim = set_name(dim, type, first+i, names[i]);
 491
 492         return dim;
 493 }
 494
 495 struct isl_dim *isl_dim_reverse(struct isl_dim *dim)
 496 {
 497         unsigned t;
 498         struct isl_name **names = NULL;
 499
 500         if (!dim)
 501                 return NULL;
 502         if (match(dim, isl_dim_in, dim, isl_dim_out))
 503                 return dim;
 504
 505         dim = isl_dim_cow(dim);
 506         if (!dim)
 507                 return NULL;
 508
 509         if (dim->names) {
 510                 names = isl_alloc_array(dim->ctx, struct isl_name *,
 511                                         dim->n_in + dim->n_out);
 512                 if (!names)
 513                         goto error;
 514                 get_names(dim, isl_dim_in, 0, dim->n_in, names);
 515                 get_names(dim, isl_dim_out, 0, dim->n_out, names + dim->n_in);
 516         }
 517
 518         t = dim->n_in;
 519         dim->n_in = dim->n_out;
 520         dim->n_out = t;
 521
 522         if (dim->names) {
 523                 dim = set_names(dim, isl_dim_out, 0, dim->n_out, names);
 524                 dim = set_names(dim, isl_dim_in, 0, dim->n_in, names + dim->n_out);
 525                 free(names);
 526         }
 527
 528         return dim;
 529 error:
 530         free(names);
 531         isl_dim_free(dim);
 532         return NULL;
 533 }
 534
 535 struct isl_dim *isl_dim_drop(struct isl_dim *dim, enum isl_dim_type type,
 536                 unsigned first, unsigned num)
 537 {
 538         int i;
 539
 540         if (!dim)
 541                 return NULL;
 542
 543         if (n == 0)
 544                 return dim;
 545
 546         isl_assert(dim->ctx, first + num <= n(dim, type), goto error);
 547         dim = isl_dim_cow(dim);
 548         if (!dim)
 549                 goto error;
 550         if (dim->names) {
 551                 dim = extend_names(dim);
 552                 if (!dim)
 553                         goto error;
 554                 for (i = 0; i < num; ++i)
 555                         isl_name_free(dim->ctx, get_name(dim, type, first+i));
 556                 for (i = first+num; i < n(dim, type); ++i)
 557                         set_name(dim, type, i - num, get_name(dim, type, i));
 558                 switch (type) {
 559                 case isl_dim_param:
 560                         get_names(dim, isl_dim_in, 0, dim->n_in,
 561                                 dim->names + offset(dim, isl_dim_in) - num);
 562                 case isl_dim_in:
 563                         get_names(dim, isl_dim_out, 0, dim->n_out,
 564                                 dim->names + offset(dim, isl_dim_out) - num);
 565                 case isl_dim_out:
 566                         ;
 567                 }
 568                 dim->n_name -= num;
 569         }
 570         switch (type) {
 571         case isl_dim_param:     dim->nparam -= num; break;
 572         case isl_dim_in:        dim->n_in -= num; break;
 573         case isl_dim_out:       dim->n_out -= num; break;
 574         }
 575         return dim;
 576 error:
 577         isl_dim_free(dim);
 578         return NULL;
 579 }
 580
 581 struct isl_dim *isl_dim_drop_inputs(struct isl_dim *dim,
 582                 unsigned first, unsigned n)
 583 {
 584         return isl_dim_drop(dim, isl_dim_in, first, n);
 585 }
 586
 587 struct isl_dim *isl_dim_drop_outputs(struct isl_dim *dim,
 588                 unsigned first, unsigned n)
 589 {
 590         return isl_dim_drop(dim, isl_dim_out, first, n);
 591 }
 592
 593 struct isl_dim *isl_dim_domain(struct isl_dim *dim)
 594 {
 595         if (!dim)
 596                 return NULL;
 597         dim = isl_dim_drop_outputs(dim, 0, dim->n_out);
 598         return isl_dim_reverse(dim);
 599 }
 600
 601 struct isl_dim *isl_dim_range(struct isl_dim *dim)
 602 {
 603         if (!dim)
 604                 return NULL;
 605         return isl_dim_drop_inputs(dim, 0, dim->n_in);
 606 }
 607
 608 struct isl_dim *isl_dim_underlying(struct isl_dim *dim, unsigned n_div)
 609 {
 610         int i;
 611
 612         if (!dim)
 613                 return NULL;
 614         if (n_div == 0 &&
 615             dim->nparam == 0 && dim->n_in == 0 && dim->n_name == 0)
 616                 return dim;
 617         dim = isl_dim_cow(dim);
 618         if (!dim)
 619                 return NULL;
 620         dim->n_out += dim->nparam + dim->n_in + n_div;
 621         dim->nparam = 0;
 622         dim->n_in = 0;
 623
 624         for (i = 0; i < dim->n_name; ++i)
 625                 isl_name_free(dim->ctx, get_name(dim, isl_dim_out, i));
 626         dim->n_name = 0;
 627
 628         return dim;
 629 }
 630
 631 unsigned isl_dim_total(struct isl_dim *dim)
 632 {
 633         return dim->nparam + dim->n_in + dim->n_out;
 634 }
 635
 636 int isl_dim_equal(struct isl_dim *dim1, struct isl_dim *dim2)
 637 {
 638         return match(dim1, isl_dim_param, dim2, isl_dim_param) &&
 639                n(dim1, isl_dim_in) == n(dim2, isl_dim_in) &&
 640                n(dim1, isl_dim_out) == n(dim2, isl_dim_out);
 641 }
 642
 643 int isl_dim_compatible(struct isl_dim *dim1, struct isl_dim *dim2)
 644 {
 645         return dim1->nparam == dim2->nparam &&
 646                dim1->n_in + dim1->n_out == dim2->n_in + dim2->n_out;
 647 }