isl_local_space.c

   1 /*
   2  * Copyright 2011      INRIA Saclay
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 license
   5  *
   6  * Written by Sven Verdoolaege, INRIA Saclay - Ile-de-France,
   7  * Parc Club Orsay Universite, ZAC des vignes, 4 rue Jacques Monod,
   8  * 91893 Orsay, France
   9  */
  10
  11 #include <isl_map_private.h>
  12 #include <isl_local_space_private.h>
  13 #include <isl_dim_private.h>
  14 #include <isl_mat_private.h>
  15 #include <isl/seq.h>
  16
  17 isl_ctx *isl_local_space_get_ctx(__isl_keep isl_local_space *ls)
  18 {
  19         return ls ? ls->dim->ctx : NULL;
  20 }
  21
  22 __isl_give isl_local_space *isl_local_space_alloc_div(__isl_take isl_dim *dim,
  23         __isl_take isl_mat *div)
  24 {
  25         isl_ctx *ctx;
  26         isl_local_space *ls = NULL;
  27
  28         if (!dim)
  29                 goto error;
  30
  31         ctx = isl_dim_get_ctx(dim);
  32         ls = isl_calloc_type(ctx, struct isl_local_space);
  33         if (!ls)
  34                 goto error;
  35
  36         ls->ref = 1;
  37         ls->dim = dim;
  38         ls->div = div;
  39
  40         return ls;
  41 error:
  42         isl_dim_free(dim);
  43         isl_local_space_free(ls);
  44         return NULL;
  45 }
  46
  47 __isl_give isl_local_space *isl_local_space_alloc(__isl_take isl_dim *dim,
  48         unsigned n_div)
  49 {
  50         isl_ctx *ctx;
  51         isl_mat *div;
  52         unsigned total;
  53
  54         if (!dim)
  55                 return NULL;
  56
  57         total = isl_dim_total(dim);
  58
  59         ctx = isl_dim_get_ctx(dim);
  60         div = isl_mat_alloc(ctx, n_div, 1 + 1 + total + n_div);
  61         return isl_local_space_alloc_div(dim, div);
  62 }
  63
  64 __isl_give isl_local_space *isl_local_space_from_dim(__isl_take isl_dim *dim)
  65 {
  66         return isl_local_space_alloc(dim, 0);
  67 }
  68
  69 __isl_give isl_local_space *isl_local_space_copy(__isl_keep isl_local_space *ls)
  70 {
  71         if (!ls)
  72                 return NULL;
  73
  74         ls->ref++;
  75         return ls;
  76 }
  77
  78 __isl_give isl_local_space *isl_local_space_dup(__isl_keep isl_local_space *ls)
  79 {
  80         if (!ls)
  81                 return NULL;
  82
  83         return isl_local_space_alloc_div(isl_dim_copy(ls->dim),
  84                                          isl_mat_copy(ls->div));
  85
  86 }
  87
  88 __isl_give isl_local_space *isl_local_space_cow(__isl_take isl_local_space *ls)
  89 {
  90         if (!ls)
  91                 return NULL;
  92
  93         if (ls->ref == 1)
  94                 return ls;
  95         ls->ref--;
  96         return isl_local_space_dup(ls);
  97 }
  98
  99 void *isl_local_space_free(__isl_take isl_local_space *ls)
 100 {
 101         if (!ls)
 102                 return NULL;
 103
 104         if (--ls->ref > 0)
 105                 return NULL;
 106
 107         isl_dim_free(ls->dim);
 108         isl_mat_free(ls->div);
 109
 110         free(ls);
 111
 112         return NULL;
 113 }
 114
 115 int isl_local_space_dim(__isl_keep isl_local_space *ls,
 116         enum isl_dim_type type)
 117 {
 118         if (!ls)
 119                 return 0;
 120         if (type == isl_dim_div)
 121                 return ls->div->n_row;
 122         if (type == isl_dim_all)
 123                 return isl_dim_size(ls->dim, isl_dim_all) + ls->div->n_row;
 124         return isl_dim_size(ls->dim, type);
 125 }
 126
 127 unsigned isl_local_space_offset(__isl_keep isl_local_space *ls,
 128         enum isl_dim_type type)
 129 {
 130         isl_dim *dim;
 131
 132         if (!ls)
 133                 return 0;
 134
 135         dim = ls->dim;
 136         switch (type) {
 137         case isl_dim_cst:       return 0;
 138         case isl_dim_param:     return 1;
 139         case isl_dim_in:        return 1 + dim->nparam;
 140         case isl_dim_out:       return 1 + dim->nparam + dim->n_in;
 141         case isl_dim_div:       return 1 + dim->nparam + dim->n_in + dim->n_out;
 142         default:                return 0;
 143         }
 144 }
 145
 146 const char *isl_local_space_get_dim_name(__isl_keep isl_local_space *ls,
 147         enum isl_dim_type type, unsigned pos)
 148 {
 149         return ls ? isl_dim_get_name(ls->dim, type, pos) : NULL;
 150 }
 151
 152 __isl_give isl_div *isl_local_space_get_div(__isl_keep isl_local_space *ls,
 153         int pos)
 154 {
 155         isl_basic_map *bmap;
 156
 157         if (!ls)
 158                 return NULL;
 159
 160         if (pos < 0 || pos >= ls->div->n_row)
 161                 isl_die(isl_local_space_get_ctx(ls), isl_error_invalid,
 162                         "index out of bounds", return NULL);
 163
 164         bmap = isl_basic_map_from_local_space(isl_local_space_copy(ls));
 165         return isl_basic_map_div(bmap, pos);
 166 }
 167
 168 __isl_give isl_dim *isl_local_space_get_dim(__isl_keep isl_local_space *ls)
 169 {
 170         if (!ls)
 171                 return NULL;
 172
 173         return isl_dim_copy(ls->dim);
 174 }
 175
 176 __isl_give isl_local_space *isl_local_space_add_div(
 177         __isl_take isl_local_space *ls, __isl_take isl_vec *div)
 178 {
 179         ls = isl_local_space_cow(ls);
 180         if (!ls || !div)
 181                 goto error;
 182
 183         if (ls->div->n_col != div->size)
 184                 isl_die(isl_local_space_get_ctx(ls), isl_error_invalid,
 185                         "incompatible dimensions", goto error);
 186
 187         ls->div = isl_mat_add_zero_cols(ls->div, 1);
 188         ls->div = isl_mat_add_rows(ls->div, 1);
 189         if (!ls->div)
 190                 goto error;
 191
 192         isl_seq_cpy(ls->div->row[ls->div->n_row - 1], div->el, div->size);
 193         isl_int_set_si(ls->div->row[ls->div->n_row - 1][div->size], 0);
 194
 195         isl_vec_free(div);
 196         return ls;
 197 error:
 198         isl_local_space_free(ls);
 199         isl_vec_free(div);
 200         return NULL;
 201 }
 202
 203 __isl_give isl_local_space *isl_local_space_replace_divs(
 204         __isl_take isl_local_space *ls, __isl_take isl_mat *div)
 205 {
 206         ls = isl_local_space_cow(ls);
 207
 208         if (!ls || !div)
 209                 goto error;
 210
 211         isl_mat_free(ls->div);
 212         ls->div = div;
 213         return ls;
 214 error:
 215         isl_mat_free(div);
 216         isl_local_space_free(ls);
 217         return NULL;
 218 }
 219
 220 /* Copy row "s" of "src" to row "d" of "dst", applying the expansion
 221  * defined by "exp".
 222  */
 223 static void expand_row(__isl_keep isl_mat *dst, int d,
 224         __isl_keep isl_mat *src, int s, int *exp)
 225 {
 226         int i;
 227         unsigned c = src->n_col - src->n_row;
 228
 229         isl_seq_cpy(dst->row[d], src->row[s], c);
 230         isl_seq_clr(dst->row[d] + c, dst->n_col - c);
 231
 232         for (i = 0; i < s; ++i)
 233                 isl_int_set(dst->row[d][c + exp[i]], src->row[s][c + i]);
 234 }
 235
 236 /* Compare (known) divs.
 237  * Return non-zero if at least one of the two divs is unknown.
 238  */
 239 static int cmp_row(__isl_keep isl_mat *div, int i, int j)
 240 {
 241         int li, lj;
 242
 243         if (isl_int_is_zero(div->row[j][0]))
 244                 return -1;
 245         if (isl_int_is_zero(div->row[i][0]))
 246                 return 1;
 247
 248         li = isl_seq_last_non_zero(div->row[i], div->n_col);
 249         lj = isl_seq_last_non_zero(div->row[j], div->n_col);
 250
 251         if (li != lj)
 252                 return li - lj;
 253
 254         return isl_seq_cmp(div->row[i], div->row[j], div->n_col);
 255 }
 256
 257 /* Combine the two lists of divs into a single list.
 258  * For each row i in div1, exp1[i] is set to the position of the corresponding
 259  * row in the result.  Similarly for div2 and exp2.
 260  * This function guarantees
 261  *      exp1[i] >= i
 262  *      exp1[i+1] > exp1[i]
 263  * For optimal merging, the two input list should have been sorted.
 264  */
 265 __isl_give isl_mat *isl_merge_divs(__isl_keep isl_mat *div1,
 266         __isl_keep isl_mat *div2, int *exp1, int *exp2)
 267 {
 268         int i, j, k;
 269         isl_mat *div = NULL;
 270         unsigned d = div1->n_col - div1->n_row;
 271
 272         div = isl_mat_alloc(div1->ctx, 1 + div1->n_row + div2->n_row,
 273                                 d + div1->n_row + div2->n_row);
 274         if (!div)
 275                 return NULL;
 276
 277         for (i = 0, j = 0, k = 0; i < div1->n_row && j < div2->n_row; ++k) {
 278                 int cmp;
 279
 280                 expand_row(div, k, div1, i, exp1);
 281                 expand_row(div, k + 1, div2, j, exp2);
 282
 283                 cmp = cmp_row(div, k, k + 1);
 284                 if (cmp == 0) {
 285                         exp1[i++] = k;
 286                         exp2[j++] = k;
 287                 } else if (cmp < 0) {
 288                         exp1[i++] = k;
 289                 } else {
 290                         exp2[j++] = k;
 291                         isl_seq_cpy(div->row[k], div->row[k + 1], div->n_col);
 292                 }
 293         }
 294         for (; i < div1->n_row; ++i, ++k) {
 295                 expand_row(div, k, div1, i, exp1);
 296                 exp1[i] = k;
 297         }
 298         for (; j < div2->n_row; ++j, ++k) {
 299                 expand_row(div, k, div2, j, exp2);
 300                 exp2[j] = k;
 301         }
 302
 303         div->n_row = k;
 304         div->n_col = d + k;
 305
 306         return div;
 307 }
 308
 309 int isl_local_space_divs_known(__isl_keep isl_local_space *ls)
 310 {
 311         int i;
 312
 313         if (!ls)
 314                 return -1;
 315
 316         for (i = 0; i < ls->div->n_row; ++i)
 317                 if (isl_int_is_zero(ls->div->row[i][0]))
 318                         return 0;
 319
 320         return 1;
 321 }
 322
 323 /* Construct a local space for a map that has the given local
 324  * space as domain and that has a zero-dimensional range.
 325  */
 326 __isl_give isl_local_space *isl_local_space_from_domain(
 327         __isl_take isl_local_space *ls)
 328 {
 329         ls = isl_local_space_cow(ls);
 330         if (!ls)
 331                 return NULL;
 332         ls->dim = isl_dim_from_domain(ls->dim);
 333         if (!ls->dim)
 334                 return isl_local_space_free(ls);
 335         return ls;
 336 }