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.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 struct isl_dim *isl_dim_join(struct isl_dim *left, struct isl_dim *right)
 348 {
 349         struct isl_dim *dim;
 350
 351         if (!left || !right)
 352                 goto error;
 353
 354         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 355                         goto error);
 356         isl_assert(left->ctx, n(left, isl_dim_out) == n(right, isl_dim_in),
 357                         goto error);
 358
 359         dim = isl_dim_alloc(left->ctx, left->nparam, left->n_in, right->n_out);
 360         if (!dim)
 361                 goto error;
 362
 363         dim = copy_names(dim, isl_dim_param, 0, left, isl_dim_param);
 364         dim = copy_names(dim, isl_dim_in, 0, left, isl_dim_in);
 365         dim = copy_names(dim, isl_dim_out, 0, right, isl_dim_out);
 366
 367         isl_dim_free(left);
 368         isl_dim_free(right);
 369
 370         return dim;
 371 error:
 372         isl_dim_free(left);
 373         isl_dim_free(right);
 374         return NULL;
 375 }
 376
 377 struct isl_dim *isl_dim_product(struct isl_dim *left, struct isl_dim *right)
 378 {
 379         struct isl_dim *dim;
 380
 381         if (!left || !right)
 382                 goto error;
 383
 384         isl_assert(left->ctx, match(left, isl_dim_param, right, isl_dim_param),
 385                         goto error);
 386
 387         dim = isl_dim_alloc(left->ctx, left->nparam,
 388                         left->n_in + right->n_in, left->n_out + right->n_out);
 389         if (!dim)
 390                 goto error;
 391
 392         dim = copy_names(dim, isl_dim_param, 0, left, isl_dim_param);
 393         dim = copy_names(dim, isl_dim_in, 0, left, isl_dim_in);
 394         dim = copy_names(dim, isl_dim_in, left->n_in, right, isl_dim_in);
 395         dim = copy_names(dim, isl_dim_out, 0, left, isl_dim_out);
 396         dim = copy_names(dim, isl_dim_out, left->n_out, right, isl_dim_out);
 397
 398         isl_dim_free(left);
 399         isl_dim_free(right);
 400
 401         return dim;
 402 error:
 403         isl_dim_free(left);
 404         isl_dim_free(right);
 405         return NULL;
 406 }
 407
 408 struct isl_dim *isl_dim_map(struct isl_dim *dim)
 409 {
 410         struct isl_name **names = NULL;
 411
 412         if (!dim)
 413                 return NULL;
 414         isl_assert(dim->ctx, dim->n_in == 0, goto error);
 415         if (dim->n_out == 0)
 416                 return dim;
 417         dim = isl_dim_cow(dim);
 418         if (!dim)
 419                 return NULL;
 420         if (dim->names) {
 421                 names = isl_calloc_array(dim->ctx, struct isl_name *,
 422                                         dim->nparam + dim->n_out + dim->n_out);
 423                 if (!names)
 424                         goto error;
 425                 get_names(dim, isl_dim_param, 0, dim->nparam, names);
 426                 get_names(dim, isl_dim_out, 0, dim->n_out, names + dim->nparam);
 427         }
 428         dim->n_in = dim->n_out;
 429         if (names) {
 430                 free(dim->names);
 431                 dim->names = names;
 432                 dim->n_name = dim->nparam + dim->n_out + dim->n_out;
 433                 dim = copy_names(dim, isl_dim_out, 0, dim, isl_dim_in);
 434         }
 435         return dim;
 436 error:
 437         isl_dim_free(dim);
 438         return NULL;
 439 }
 440
 441 static struct isl_dim *set_names(struct isl_dim *dim, enum isl_dim_type type,
 442         unsigned first, unsigned n, struct isl_name **names)
 443 {
 444         int i;
 445
 446         for (i = 0; i < n ; ++i)
 447                 dim = set_name(dim, type, first+i, names[i]);
 448
 449         return dim;
 450 }
 451
 452 struct isl_dim *isl_dim_reverse(struct isl_dim *dim)
 453 {
 454         unsigned t;
 455         struct isl_name **names = NULL;
 456
 457         if (!dim)
 458                 return NULL;
 459         if (match(dim, isl_dim_in, dim, isl_dim_out))
 460                 return dim;
 461
 462         dim = isl_dim_cow(dim);
 463         if (!dim)
 464                 return NULL;
 465
 466         if (dim->names) {
 467                 names = isl_alloc_array(dim->ctx, struct isl_name *,
 468                                         dim->n_in + dim->n_out);
 469                 if (!names)
 470                         goto error;
 471                 get_names(dim, isl_dim_in, 0, dim->n_in, names);
 472                 get_names(dim, isl_dim_out, 0, dim->n_out, names + dim->n_in);
 473         }
 474
 475         t = dim->n_in;
 476         dim->n_in = dim->n_out;
 477         dim->n_out = t;
 478
 479         if (dim->names) {
 480                 dim = set_names(dim, isl_dim_out, 0, dim->n_out, names);
 481                 dim = set_names(dim, isl_dim_in, 0, dim->n_in, names + dim->n_out);
 482                 free(names);
 483         }
 484
 485         return dim;
 486 error:
 487         free(names);
 488         isl_dim_free(dim);
 489         return NULL;
 490 }
 491
 492 struct isl_dim *isl_dim_drop(struct isl_dim *dim, enum isl_dim_type type,
 493                 unsigned first, unsigned num)
 494 {
 495         int i;
 496
 497         if (!dim)
 498                 return NULL;
 499
 500         if (n == 0)
 501                 return dim;
 502
 503         isl_assert(dim->ctx, first + num <= n(dim, type), goto error);
 504         dim = isl_dim_cow(dim);
 505         if (!dim)
 506                 goto error;
 507         if (dim->names) {
 508                 dim = extend_names(dim);
 509                 if (!dim)
 510                         goto error;
 511                 for (i = 0; i < num; ++i)
 512                         isl_name_free(dim->ctx, get_name(dim, type, first+i));
 513                 for (i = first+num; i < n(dim, type); ++i)
 514                         set_name(dim, type, i - num, get_name(dim, type, i));
 515                 switch (type) {
 516                 case isl_dim_param:
 517                         get_names(dim, isl_dim_in, 0, dim->n_in,
 518                                 dim->names + offset(dim, isl_dim_in) - num);
 519                 case isl_dim_in:
 520                         get_names(dim, isl_dim_out, 0, dim->n_out,
 521                                 dim->names + offset(dim, isl_dim_out) - num);
 522                 case isl_dim_out:
 523                         ;
 524                 }
 525                 dim->n_name -= num;
 526         }
 527         switch (type) {
 528         case isl_dim_param:     dim->nparam -= num; break;
 529         case isl_dim_in:        dim->n_in -= num; break;
 530         case isl_dim_out:       dim->n_out -= num; break;
 531         }
 532         return dim;
 533 error:
 534         isl_dim_free(dim);
 535         return NULL;
 536 }
 537
 538 struct isl_dim *isl_dim_drop_inputs(struct isl_dim *dim,
 539                 unsigned first, unsigned n)
 540 {
 541         return isl_dim_drop(dim, isl_dim_in, first, n);
 542 }
 543
 544 struct isl_dim *isl_dim_drop_outputs(struct isl_dim *dim,
 545                 unsigned first, unsigned n)
 546 {
 547         return isl_dim_drop(dim, isl_dim_out, first, n);
 548 }
 549
 550 struct isl_dim *isl_dim_domain(struct isl_dim *dim)
 551 {
 552         if (!dim)
 553                 return NULL;
 554         dim = isl_dim_drop_outputs(dim, 0, dim->n_out);
 555         return isl_dim_reverse(dim);
 556 }
 557
 558 struct isl_dim *isl_dim_range(struct isl_dim *dim)
 559 {
 560         if (!dim)
 561                 return NULL;
 562         return isl_dim_drop_inputs(dim, 0, dim->n_in);
 563 }
 564
 565 struct isl_dim *isl_dim_underlying(struct isl_dim *dim, unsigned n_div)
 566 {
 567         int i;
 568
 569         if (!dim)
 570                 return NULL;
 571         if (n_div == 0 &&
 572             dim->nparam == 0 && dim->n_in == 0 && dim->n_name == 0)
 573                 return dim;
 574         dim = isl_dim_cow(dim);
 575         if (!dim)
 576                 return NULL;
 577         dim->n_out += dim->nparam + dim->n_in + n_div;
 578         dim->nparam = 0;
 579         dim->n_in = 0;
 580
 581         for (i = 0; i < dim->n_name; ++i)
 582                 isl_name_free(dim->ctx, get_name(dim, isl_dim_out, i));
 583         dim->n_name = 0;
 584
 585         return dim;
 586 }
 587
 588 unsigned isl_dim_total(struct isl_dim *dim)
 589 {
 590         return dim->nparam + dim->n_in + dim->n_out;
 591 }
 592
 593 int isl_dim_equal(struct isl_dim *dim1, struct isl_dim *dim2)
 594 {
 595         return match(dim1, isl_dim_param, dim2, isl_dim_param) &&
 596                n(dim1, isl_dim_in) == n(dim2, isl_dim_in) &&
 597                n(dim1, isl_dim_out) == n(dim2, isl_dim_out);
 598 }
 599
 600 int isl_dim_compatible(struct isl_dim *dim1, struct isl_dim *dim2)
 601 {
 602         return dim1->nparam == dim2->nparam &&
 603                dim1->n_in + dim1->n_out == dim2->n_in + dim2->n_out;
 604 }