isl_constraint.c

   1 #include <isl_constraint.h>
   2 #include "isl_map_private.h"
   3
   4 static unsigned n(struct isl_constraint *c, enum isl_dim_type type)
   5 {
   6         return isl_basic_map_dim(c->bmap, type);
   7 }
   8
   9 static unsigned offset(struct isl_constraint *c, enum isl_dim_type type)
  10 {
  11         struct isl_dim *dim = c->bmap->dim;
  12         switch (type) {
  13         case isl_dim_param:     return 1;
  14         case isl_dim_in:        return 1 + dim->nparam;
  15         case isl_dim_out:       return 1 + dim->nparam + dim->n_in;
  16         case isl_dim_div:       return 1 + dim->nparam + dim->n_in + dim->n_out;
  17         }
  18 }
  19
  20 static unsigned basic_set_offset(struct isl_basic_set *bset,
  21                                                         enum isl_dim_type type)
  22 {
  23         struct isl_dim *dim = bset->dim;
  24         switch (type) {
  25         case isl_dim_param:     return 1;
  26         case isl_dim_in:        return 1 + dim->nparam;
  27         case isl_dim_out:       return 1 + dim->nparam + dim->n_in;
  28         case isl_dim_div:       return 1 + dim->nparam + dim->n_in + dim->n_out;
  29         }
  30 }
  31
  32 struct isl_constraint *isl_basic_map_constraint(struct isl_basic_map *bmap,
  33         isl_int **line)
  34 {
  35         struct isl_constraint *constraint;
  36
  37         if (!bmap || !line)
  38                 goto error;
  39
  40         constraint = isl_alloc_type(bmap->ctx, struct isl_constraint);
  41         if (!constraint)
  42                 goto error;
  43
  44         constraint->ctx = bmap->ctx;
  45         isl_ctx_ref(constraint->ctx);
  46         constraint->ref = 1;
  47         constraint->bmap = bmap;
  48         constraint->line = line;
  49
  50         return constraint;
  51 error:
  52         isl_basic_map_free(bmap);
  53         return NULL;
  54 }
  55
  56 struct isl_constraint *isl_basic_set_constraint(struct isl_basic_set *bset,
  57         isl_int **line)
  58 {
  59         return isl_basic_map_constraint((struct isl_basic_map *)bset, line);
  60 }
  61
  62 struct isl_constraint *isl_equality_alloc(struct isl_dim *dim)
  63 {
  64         struct isl_basic_map *bmap;
  65
  66         if (!dim)
  67                 return NULL;
  68
  69         bmap = isl_basic_map_alloc_dim(dim, 0, 1, 0);
  70         if (!bmap)
  71                 return NULL;
  72
  73         isl_basic_map_alloc_equality(bmap);
  74         isl_seq_clr(bmap->eq[0], 1 + isl_basic_map_total_dim(bmap));
  75         return isl_basic_map_constraint(bmap, &bmap->eq[0]);
  76 }
  77
  78 struct isl_constraint *isl_inequality_alloc(struct isl_dim *dim)
  79 {
  80         struct isl_basic_map *bmap;
  81
  82         if (!dim)
  83                 return NULL;
  84
  85         bmap = isl_basic_map_alloc_dim(dim, 0, 0, 1);
  86         if (!bmap)
  87                 return NULL;
  88
  89         isl_basic_map_alloc_inequality(bmap);
  90         isl_seq_clr(bmap->ineq[0], 1 + isl_basic_map_total_dim(bmap));
  91         return isl_basic_map_constraint(bmap, &bmap->ineq[0]);
  92 }
  93
  94 struct isl_constraint *isl_constraint_dup(struct isl_constraint *c)
  95 {
  96         if (!c)
  97                 return NULL;
  98
  99         return isl_basic_map_constraint(isl_basic_map_copy(c->bmap), c->line);
 100 }
 101
 102 struct isl_constraint *isl_constraint_cow(struct isl_constraint *c)
 103 {
 104         if (!c)
 105                 return NULL;
 106
 107         if (c->ref == 1)
 108                 return c;
 109         c->ref--;
 110         return isl_constraint_dup(c);
 111 }
 112
 113 struct isl_constraint *isl_constraint_copy(struct isl_constraint *constraint)
 114 {
 115         if (!constraint)
 116                 return NULL;
 117
 118         constraint->ref++;
 119         return constraint;
 120 }
 121
 122 struct isl_constraint *isl_constraint_free(struct isl_constraint *c)
 123 {
 124         if (!c)
 125                 return;
 126
 127         if (--c->ref > 0)
 128                 return;
 129
 130         isl_basic_map_free(c->bmap);
 131         isl_ctx_deref(c->ctx);
 132         free(c);
 133 }
 134
 135 struct isl_constraint *isl_basic_set_first_constraint(
 136         struct isl_basic_set *bset)
 137 {
 138         struct isl_constraint *c;
 139
 140         if (!bset)
 141                 return NULL;
 142
 143         if (bset->n_eq > 0)
 144                 return isl_basic_set_constraint(bset, &bset->eq[0]);
 145
 146         if (bset->n_ineq > 0)
 147                 return isl_basic_set_constraint(bset, &bset->ineq[0]);
 148
 149         isl_basic_set_free(bset);
 150         return NULL;
 151 }
 152
 153 struct isl_constraint *isl_constraint_next(struct isl_constraint *c)
 154 {
 155         c = isl_constraint_cow(c);
 156         c->line++;
 157         if (c->line >= c->bmap->eq + c->bmap->n_eq && c->line < c->bmap->ineq)
 158                 c->line = c->bmap->ineq;
 159         if (c->line < c->bmap->ineq + c->bmap->n_ineq)
 160                 return c;
 161         isl_constraint_free(c);
 162         return NULL;
 163 }
 164
 165 int isl_constraint_is_equal(struct isl_constraint *constraint1,
 166         struct isl_constraint *constraint2)
 167 {
 168         if (!constraint1 || !constraint2)
 169                 return 0;
 170         return constraint1->bmap == constraint2->bmap &&
 171                constraint1->line == constraint2->line;
 172 }
 173
 174 struct isl_basic_set *isl_basic_set_add_constraint(
 175         struct isl_basic_set *bset, struct isl_constraint *constraint)
 176 {
 177         if (!bset || !constraint)
 178                 goto error;
 179
 180         isl_assert(constraint->ctx,
 181                 isl_dim_equal(bset->dim, constraint->bmap->dim), goto error);
 182
 183         bset = isl_basic_set_intersect(bset,
 184                 isl_basic_set_copy((struct isl_basic_set *)constraint->bmap));
 185         isl_constraint_free(constraint);
 186         return bset;
 187 error:
 188         isl_basic_set_free(bset);
 189         isl_constraint_free(constraint);
 190         return NULL;
 191 }
 192
 193 struct isl_constraint *isl_constraint_add_div(struct isl_constraint *constraint,
 194         struct isl_div *div, int *pos)
 195 {
 196         if (!constraint || !div)
 197                 goto error;
 198
 199         isl_assert(constraint->ctx,
 200             isl_dim_equal(div->bmap->dim, constraint->bmap->dim), goto error);
 201         isl_assert(constraint->ctx,
 202             constraint->bmap->n_eq + constraint->bmap->n_ineq == 1, goto error);
 203
 204         constraint->bmap = isl_basic_map_extend_dim(constraint->bmap,
 205                                 isl_dim_copy(constraint->bmap->dim), 1, 0, 0);
 206         if (!constraint->bmap)
 207                 goto error;
 208         constraint->line = &constraint->bmap->eq[0];
 209         *pos = isl_basic_map_alloc_div(constraint->bmap);
 210         if (*pos < 0)
 211                 goto error;
 212         isl_seq_cpy(constraint->bmap->div[*pos], div->line[0],
 213                         1 + 1 + isl_basic_map_total_dim(constraint->bmap));
 214         isl_div_free(div);
 215         return constraint;
 216 error:
 217         isl_constraint_free(constraint);
 218         isl_div_free(div);
 219         return NULL;
 220 }
 221
 222 int isl_constraint_dim(struct isl_constraint *constraint,
 223         enum isl_dim_type type)
 224 {
 225         if (!constraint)
 226                 return -1;
 227         return n(constraint, type);
 228 }
 229
 230 void isl_constraint_get_constant(struct isl_constraint *constraint, isl_int *v)
 231 {
 232         if (!constraint)
 233                 return;
 234         isl_int_set(*v, constraint->line[0][0]);
 235 }
 236
 237 void isl_constraint_get_coefficient(struct isl_constraint *constraint,
 238         enum isl_dim_type type, int pos, isl_int *v)
 239 {
 240         if (!constraint)
 241                 return;
 242
 243         isl_assert(constraint->ctx, pos < n(constraint, type), return);
 244         isl_int_set(*v, constraint->line[0][offset(constraint, type) + pos]);
 245 }
 246
 247 struct isl_div *isl_constraint_div(struct isl_constraint *constraint, int pos)
 248 {
 249         if (!constraint)
 250                 return NULL;
 251
 252         isl_assert(constraint->ctx, pos < n(constraint, isl_dim_div),
 253                         return NULL);
 254         return isl_basic_map_div(constraint->bmap, constraint->bmap->div+pos);
 255 }
 256
 257 void isl_constraint_set_constant(struct isl_constraint *constraint, isl_int v)
 258 {
 259         if (!constraint)
 260                 return;
 261         isl_int_set(constraint->line[0][0], v);
 262 }
 263
 264 void isl_constraint_set_coefficient(struct isl_constraint *constraint,
 265         enum isl_dim_type type, int pos, isl_int v)
 266 {
 267         if (!constraint)
 268                 return;
 269
 270         isl_assert(constraint->ctx, pos < n(constraint, type), return);
 271         isl_int_set(constraint->line[0][offset(constraint, type) + pos], v);
 272 }
 273
 274 void isl_constraint_clear(struct isl_constraint *constraint)
 275 {
 276         struct isl_basic_set *bset;
 277         unsigned total;
 278
 279         if (!constraint)
 280                 return;
 281         total = isl_basic_map_total_dim(constraint->bmap);
 282         isl_seq_clr(constraint->line[0], 1 + total);
 283 }
 284
 285 struct isl_constraint *isl_constraint_negate(struct isl_constraint *constraint)
 286 {
 287         unsigned total;
 288
 289         if (!constraint)
 290                 return NULL;
 291
 292         isl_assert(constraint->ctx, !isl_constraint_is_equality(constraint),
 293                         goto error);
 294         isl_assert(constraint->ctx, constraint->bmap->ref == 1, goto error);
 295         total = isl_basic_map_total_dim(constraint->bmap);
 296         isl_seq_neg(constraint->line[0], constraint->line[0], 1 + total);
 297         isl_int_sub_ui(constraint->line[0][0], constraint->line[0][0], 1);
 298         F_CLR(constraint->bmap, ISL_BASIC_MAP_NORMALIZED);
 299         return constraint;
 300 error:
 301         isl_constraint_free(constraint);
 302         return NULL;
 303 }
 304
 305 int isl_constraint_is_equality(struct isl_constraint *constraint)
 306 {
 307         if (!constraint)
 308                 return -1;
 309         return constraint->line < constraint->bmap->eq + constraint->bmap->n_eq;
 310 }
 311
 312
 313 struct isl_basic_set *isl_basic_set_from_constraint(
 314         struct isl_constraint *constraint)
 315 {
 316         int k;
 317         struct isl_basic_set *constraint_bset, *bset;
 318         isl_int *c;
 319         unsigned dim;
 320         unsigned nparam;
 321         unsigned total;
 322
 323         if (!constraint)
 324                 return NULL;
 325
 326         isl_assert(constraint->ctx,n(constraint, isl_dim_in) == 0, goto error);
 327
 328         constraint_bset = (struct isl_basic_set *)constraint->bmap;
 329         bset = isl_basic_set_universe_like(constraint_bset);
 330         bset = isl_basic_set_align_divs(bset, constraint_bset);
 331         nparam = isl_basic_set_n_param(bset);
 332         dim = isl_basic_set_n_dim(bset);
 333         bset = isl_basic_set_extend(bset, nparam, dim, 0, 1, 1);
 334         if (isl_constraint_is_equality(constraint)) {
 335                 k = isl_basic_set_alloc_equality(bset);
 336                 if (k < 0)
 337                         goto error;
 338                 c = bset->eq[k];
 339         }
 340         else {
 341                 k = isl_basic_set_alloc_inequality(bset);
 342                 if (k < 0)
 343                         goto error;
 344                 c = bset->ineq[k];
 345         }
 346         total = isl_basic_set_total_dim(bset);
 347         isl_seq_cpy(c, constraint->line[0], 1 + total);
 348         isl_constraint_free(constraint);
 349         return bset;
 350 error:
 351         isl_constraint_free(constraint);
 352         isl_basic_set_free(bset);
 353         return NULL;
 354 }
 355
 356 int isl_basic_set_has_defining_equality(
 357         struct isl_basic_set *bset, enum isl_dim_type type, int pos,
 358         struct isl_constraint **c)
 359 {
 360         int i;
 361         unsigned offset;
 362         unsigned total;
 363
 364         if (!bset)
 365                 return -1;
 366         offset = basic_set_offset(bset, type);
 367         total = isl_basic_set_total_dim(bset);
 368         isl_assert(bset->ctx, pos < isl_basic_set_dim(bset, type), return -1);
 369         for (i = 0; i < bset->n_eq; ++i)
 370                 if (!isl_int_is_zero(bset->eq[i][offset + pos]) &&
 371                     isl_seq_first_non_zero(bset->eq[i]+offset+pos+1,
 372                                            1+total-offset-pos-1) == -1) {
 373                         *c= isl_basic_set_constraint(isl_basic_set_copy(bset),
 374                                                                 &bset->eq[i]);
 375                         return 1;
 376                 }
 377         return 0;
 378 }
 379
 380 int isl_basic_set_has_defining_inequalities(
 381         struct isl_basic_set *bset, enum isl_dim_type type, int pos,
 382         struct isl_constraint **lower,
 383         struct isl_constraint **upper)
 384 {
 385         int i, j;
 386         unsigned offset;
 387         unsigned total;
 388         isl_int m;
 389         isl_int **lower_line, **upper_line;
 390
 391         if (!bset)
 392                 return -1;
 393         offset = basic_set_offset(bset, type);
 394         total = isl_basic_set_total_dim(bset);
 395         isl_assert(bset->ctx, pos < isl_basic_set_dim(bset, type), return -1);
 396         isl_int_init(m);
 397         for (i = 0; i < bset->n_ineq; ++i) {
 398                 if (isl_int_is_zero(bset->ineq[i][offset + pos]))
 399                         continue;
 400                 if (isl_int_is_one(bset->ineq[i][offset + pos]))
 401                         continue;
 402                 if (isl_int_is_negone(bset->ineq[i][offset + pos]))
 403                         continue;
 404                 if (isl_seq_first_non_zero(bset->ineq[i]+offset+pos+1,
 405                                                 1+total-offset-pos-1) != -1)
 406                         continue;
 407                 for (j = i + i; j < bset->n_ineq; ++j) {
 408                         if (!isl_seq_is_neg(bset->ineq[i]+1, bset->ineq[j]+1,
 409                                             total))
 410                                 continue;
 411                         isl_int_add(m, bset->ineq[i][0], bset->ineq[j][0]);
 412                         if (isl_int_abs_ge(m, bset->ineq[i][offset+pos]))
 413                                 continue;
 414
 415                         if (isl_int_is_pos(bset->ineq[i][offset+pos])) {
 416                                 lower_line = &bset->ineq[i];
 417                                 upper_line = &bset->ineq[j];
 418                         } else {
 419                                 lower_line = &bset->ineq[j];
 420                                 upper_line = &bset->ineq[i];
 421                         }
 422                         *lower = isl_basic_set_constraint(
 423                                         isl_basic_set_copy(bset), lower_line);
 424                         *upper = isl_basic_set_constraint(
 425                                         isl_basic_set_copy(bset), upper_line);
 426                         isl_int_clear(m);
 427                         return 1;
 428                 }
 429         }
 430         *lower = NULL;
 431         *upper = NULL;
 432         isl_int_clear(m);
 433         return 0;
 434 }