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         isl_local_space *dup;
  81
  82         if (!ls)
  83                 return NULL;
  84
  85         return isl_local_space_alloc_div(isl_dim_copy(ls->dim),
  86                                          isl_mat_copy(ls->div));
  87
  88 }
  89
  90 __isl_give isl_local_space *isl_local_space_cow(__isl_take isl_local_space *ls)
  91 {
  92         if (!ls)
  93                 return NULL;
  94
  95         if (ls->ref == 1)
  96                 return ls;
  97         ls->ref--;
  98         return isl_local_space_dup(ls);
  99 }
 100
 101 void *isl_local_space_free(__isl_take isl_local_space *ls)
 102 {
 103         if (!ls)
 104                 return NULL;
 105
 106         if (--ls->ref > 0)
 107                 return NULL;
 108
 109         isl_dim_free(ls->dim);
 110         isl_mat_free(ls->div);
 111
 112         free(ls);
 113
 114         return NULL;
 115 }
 116
 117 int isl_local_space_dim(__isl_keep isl_local_space *ls,
 118         enum isl_dim_type type)
 119 {
 120         if (!ls)
 121                 return 0;
 122         if (type == isl_dim_div)
 123                 return ls->div->n_row;
 124         if (type == isl_dim_all)
 125                 return isl_dim_size(ls->dim, isl_dim_all) + ls->div->n_row;
 126         return isl_dim_size(ls->dim, type);
 127 }
 128
 129 unsigned isl_local_space_offset(__isl_keep isl_local_space *ls,
 130         enum isl_dim_type type)
 131 {
 132         isl_dim *dim;
 133
 134         if (!ls)
 135                 return 0;
 136
 137         dim = ls->dim;
 138         switch (type) {
 139         case isl_dim_cst:       return 0;
 140         case isl_dim_param:     return 1;
 141         case isl_dim_in:        return 1 + dim->nparam;
 142         case isl_dim_out:       return 1 + dim->nparam + dim->n_in;
 143         case isl_dim_div:       return 1 + dim->nparam + dim->n_in + dim->n_out;
 144         default:                return 0;
 145         }
 146 }
 147
 148 const char *isl_local_space_get_dim_name(__isl_keep isl_local_space *ls,
 149         enum isl_dim_type type, unsigned pos)
 150 {
 151         return ls ? isl_dim_get_name(ls->dim, type, pos) : NULL;
 152 }
 153
 154 __isl_give isl_div *isl_local_space_get_div(__isl_keep isl_local_space *ls,
 155         int pos)
 156 {
 157         isl_basic_map *bmap;
 158
 159         if (!ls)
 160                 return NULL;
 161
 162         if (pos < 0 || pos >= ls->div->n_row)
 163                 isl_die(isl_local_space_get_ctx(ls), isl_error_invalid,
 164                         "index out of bounds", return NULL);
 165
 166         bmap = isl_basic_map_from_local_space(isl_local_space_copy(ls));
 167         return isl_basic_map_div(bmap, pos);
 168 }
 169
 170 __isl_give isl_dim *isl_local_space_get_dim(__isl_keep isl_local_space *ls)
 171 {
 172         if (!ls)
 173                 return NULL;
 174
 175         return isl_dim_copy(ls->dim);
 176 }
 177
 178 __isl_give isl_local_space *isl_local_space_add_div(
 179         __isl_take isl_local_space *ls, __isl_take isl_vec *div)
 180 {
 181         ls = isl_local_space_cow(ls);
 182         if (!ls || !div)
 183                 goto error;
 184
 185         if (ls->div->n_col != div->size)
 186                 isl_die(isl_local_space_get_ctx(ls), isl_error_invalid,
 187                         "incompatible dimensions", goto error);
 188
 189         ls->div = isl_mat_add_zero_cols(ls->div, 1);
 190         ls->div = isl_mat_add_rows(ls->div, 1);
 191         if (!ls->div)
 192                 goto error;
 193
 194         isl_seq_cpy(ls->div->row[ls->div->n_row - 1], div->el, div->size);
 195         isl_int_set_si(ls->div->row[ls->div->n_row - 1][div->size], 0);
 196
 197         isl_vec_free(div);
 198         return ls;
 199 error:
 200         isl_local_space_free(ls);
 201         isl_vec_free(div);
 202         return NULL;
 203 }
 204
 205 __isl_give isl_local_space *isl_local_space_replace_divs(
 206         __isl_take isl_local_space *ls, __isl_take isl_mat *div)
 207 {
 208         ls = isl_local_space_cow(ls);
 209
 210         if (!ls || !div)
 211                 goto error;
 212
 213         isl_mat_free(ls->div);
 214         ls->div = div;
 215         return ls;
 216 error:
 217         isl_mat_free(div);
 218         isl_local_space_free(ls);
 219         return NULL;
 220 }
 221
 222 /* Copy row "s" of "src" to row "d" of "dst", applying the expansion
 223  * defined by "exp".
 224  */
 225 static void expand_row(__isl_keep isl_mat *dst, int d,
 226         __isl_keep isl_mat *src, int s, int *exp)
 227 {
 228         int i;
 229         unsigned c = src->n_col - src->n_row;
 230
 231         isl_seq_cpy(dst->row[d], src->row[s], c);
 232         isl_seq_clr(dst->row[d] + c, dst->n_col - c);
 233
 234         for (i = 0; i < s; ++i)
 235                 isl_int_set(dst->row[d][c + exp[i]], src->row[s][c + i]);
 236 }
 237
 238 /* Compare (known) divs.
 239  * Return non-zero if at least one of the two divs is unknown.
 240  */
 241 static int cmp_row(__isl_keep isl_mat *div, int i, int j)
 242 {
 243         int li, lj;
 244
 245         if (isl_int_is_zero(div->row[j][0]))
 246                 return -1;
 247         if (isl_int_is_zero(div->row[i][0]))
 248                 return 1;
 249
 250         li = isl_seq_last_non_zero(div->row[i], div->n_col);
 251         lj = isl_seq_last_non_zero(div->row[j], div->n_col);
 252
 253         if (li != lj)
 254                 return li - lj;
 255
 256         return isl_seq_cmp(div->row[i], div->row[j], div->n_col);
 257 }
 258
 259 /* Combine the two lists of divs into a single list.
 260  * For each row i in div1, exp1[i] is set to the position of the corresponding
 261  * row in the result.  Similarly for div2 and exp2.
 262  * This function guarantees
 263  *      exp1[i] >= i
 264  *      exp1[i+1] > exp1[i]
 265  * For optimal merging, the two input list should have been sorted.
 266  */
 267 __isl_give isl_mat *isl_merge_divs(__isl_keep isl_mat *div1,
 268         __isl_keep isl_mat *div2, int *exp1, int *exp2)
 269 {
 270         int i, j, k;
 271         isl_mat *div = NULL;
 272         unsigned d = div1->n_col - div1->n_row;
 273
 274         div = isl_mat_alloc(div1->ctx, 1 + div1->n_row + div2->n_row,
 275                                 d + div1->n_row + div2->n_row);
 276         if (!div)
 277                 return NULL;
 278
 279         for (i = 0, j = 0, k = 0; i < div1->n_row && j < div2->n_row; ++k) {
 280                 int cmp;
 281
 282                 expand_row(div, k, div1, i, exp1);
 283                 expand_row(div, k + 1, div2, j, exp2);
 284
 285                 cmp = cmp_row(div, k, k + 1);
 286                 if (cmp == 0) {
 287                         exp1[i++] = k;
 288                         exp2[j++] = k;
 289                 } else if (cmp < 0) {
 290                         exp1[i++] = k;
 291                 } else {
 292                         exp2[j++] = k;
 293                         isl_seq_cpy(div->row[k], div->row[k + 1], div->n_col);
 294                 }
 295         }
 296         for (; i < div1->n_row; ++i, ++k) {
 297                 expand_row(div, k, div1, i, exp1);
 298                 exp1[i] = k;
 299         }
 300         for (; j < div2->n_row; ++j, ++k) {
 301                 expand_row(div, k, div2, j, exp2);
 302                 exp2[j] = k;
 303         }
 304
 305         div->n_row = k;
 306         div->n_col = d + k;
 307
 308         return div;
 309 }
 310
 311 int isl_local_space_divs_known(__isl_keep isl_local_space *ls)
 312 {
 313         int i;
 314
 315         if (!ls)
 316                 return -1;
 317
 318         for (i = 0; i < ls->div->n_row; ++i)
 319                 if (isl_int_is_zero(ls->div->row[i][0]))
 320                         return 0;
 321
 322         return 1;
 323 }