isl_dim_map.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  * Copyright 2010      INRIA Saclay
   4  *
   5  * Use of this software is governed by the GNU LGPLv2.1 license
   6  *
   7  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   8  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   9  * and INRIA Saclay - Ile-de-France, Parc Club Orsay Universite,
  10  * ZAC des vignes, 4 rue Jacques Monod, 91893 Orsay, France
  11  */
  12
  13 #include <isl_map_private.h>
  14 #include <isl_dim_private.h>
  15 #include <isl_dim_map.h>
  16 #include <isl_reordering.h>
  17
  18 /* Maps dst positions to src positions */
  19 struct isl_dim_map {
  20         unsigned len;
  21         int pos[1];
  22 };
  23
  24 __isl_give isl_dim_map *isl_dim_map_alloc(isl_ctx *ctx, unsigned len)
  25 {
  26         int i;
  27         struct isl_dim_map *dim_map;
  28         dim_map = isl_alloc(ctx, struct isl_dim_map,
  29                                 sizeof(struct isl_dim_map) + len * sizeof(int));
  30         if (!dim_map)
  31                 return NULL;
  32         dim_map->len = 1 + len;
  33         dim_map->pos[0] = 0;
  34         for (i = 0; i < len; ++i)
  35                 dim_map->pos[1 + i] = -1;
  36         return dim_map;
  37 }
  38
  39 void isl_dim_map_dim_range(__isl_keep isl_dim_map *dim_map,
  40         struct isl_dim *dim, enum isl_dim_type type,
  41         unsigned first, unsigned n, unsigned dst_pos)
  42 {
  43         int i;
  44         unsigned src_pos;
  45
  46         if (!dim_map || !dim)
  47                 return;
  48
  49         src_pos = 1 + isl_dim_offset(dim, type);
  50         for (i = 0; i < n; ++i)
  51                 dim_map->pos[1 + dst_pos + i] = src_pos + first + i;
  52 }
  53
  54 void isl_dim_map_dim(__isl_keep isl_dim_map *dim_map, __isl_keep isl_dim *dim,
  55         enum isl_dim_type type, unsigned dst_pos)
  56 {
  57         isl_dim_map_dim_range(dim_map, dim, type,
  58                               0, isl_dim_size(dim, type), dst_pos);
  59 }
  60
  61 void isl_dim_map_div(__isl_keep isl_dim_map *dim_map,
  62         __isl_keep isl_basic_map *bmap, unsigned dst_pos)
  63 {
  64         int i;
  65         unsigned src_pos;
  66
  67         if (!dim_map || !bmap)
  68                 return;
  69
  70         src_pos = 1 + isl_dim_total(bmap->dim);
  71         for (i = 0; i < bmap->n_div; ++i)
  72                 dim_map->pos[1 + dst_pos + i] = src_pos + i;
  73 }
  74
  75 void isl_dim_map_dump(struct isl_dim_map *dim_map)
  76 {
  77         int i;
  78
  79         for (i = 0; i < dim_map->len; ++i)
  80                 fprintf(stderr, "%d -> %d; ", i, dim_map->pos[i]);
  81         fprintf(stderr, "\n");
  82 }
  83
  84 static void copy_constraint_dim_map(isl_int *dst, isl_int *src,
  85                                         struct isl_dim_map *dim_map)
  86 {
  87         int i;
  88
  89         for (i = 0; i < dim_map->len; ++i) {
  90                 if (dim_map->pos[i] < 0)
  91                         isl_int_set_si(dst[i], 0);
  92                 else
  93                         isl_int_set(dst[i], src[dim_map->pos[i]]);
  94         }
  95 }
  96
  97 static void copy_div_dim_map(isl_int *dst, isl_int *src,
  98                                         struct isl_dim_map *dim_map)
  99 {
 100         isl_int_set(dst[0], src[0]);
 101         copy_constraint_dim_map(dst+1, src+1, dim_map);
 102 }
 103
 104 __isl_give isl_basic_map *isl_basic_map_add_constraints_dim_map(
 105         __isl_take isl_basic_map *dst, __isl_take isl_basic_map *src,
 106         __isl_take isl_dim_map *dim_map)
 107 {
 108         int i;
 109
 110         if (!src || !dst || !dim_map)
 111                 goto error;
 112
 113         for (i = 0; i < src->n_eq; ++i) {
 114                 int i1 = isl_basic_map_alloc_equality(dst);
 115                 if (i1 < 0)
 116                         goto error;
 117                 copy_constraint_dim_map(dst->eq[i1], src->eq[i], dim_map);
 118         }
 119
 120         for (i = 0; i < src->n_ineq; ++i) {
 121                 int i1 = isl_basic_map_alloc_inequality(dst);
 122                 if (i1 < 0)
 123                         goto error;
 124                 copy_constraint_dim_map(dst->ineq[i1], src->ineq[i], dim_map);
 125         }
 126
 127         for (i = 0; i < src->n_div; ++i) {
 128                 int i1 = isl_basic_map_alloc_div(dst);
 129                 if (i1 < 0)
 130                         goto error;
 131                 copy_div_dim_map(dst->div[i1], src->div[i], dim_map);
 132         }
 133
 134         free(dim_map);
 135         isl_basic_map_free(src);
 136
 137         return dst;
 138 error:
 139         free(dim_map);
 140         isl_basic_map_free(src);
 141         isl_basic_map_free(dst);
 142         return NULL;
 143 }
 144
 145 /* Extend the given dim_map with mappings for the divs in bmap.
 146  */
 147 __isl_give isl_dim_map *isl_dim_map_extend(__isl_keep isl_dim_map *dim_map,
 148         __isl_keep isl_basic_map *bmap)
 149 {
 150         int i;
 151         struct isl_dim_map *res;
 152         int offset;
 153
 154         offset = isl_basic_map_offset(bmap, isl_dim_div);
 155
 156         res = isl_dim_map_alloc(bmap->ctx, dim_map->len - 1 + bmap->n_div);
 157         if (!res)
 158                 return NULL;
 159
 160         for (i = 0; i < dim_map->len; ++i)
 161                 res->pos[i] = dim_map->pos[i];
 162         for (i = 0; i < bmap->n_div; ++i)
 163                 res->pos[dim_map->len + i] = offset + i;
 164
 165         return res;
 166 }
 167
 168 /* Extract a dim_map from a reordering.
 169  * We essentially need to reverse the mapping, and add an offset
 170  * of 1 for the constant term.
 171  */
 172 __isl_give isl_dim_map *isl_dim_map_from_reordering(
 173         __isl_keep isl_reordering *exp)
 174 {
 175         int i;
 176         isl_ctx *ctx;
 177         struct isl_dim_map *dim_map;
 178
 179         if (!exp)
 180                 return NULL;
 181
 182         ctx = isl_dim_get_ctx(exp->dim);
 183         dim_map = isl_dim_map_alloc(ctx, isl_dim_total(exp->dim));
 184         if (!dim_map)
 185                 return NULL;
 186
 187         for (i = 0; i < exp->len; ++i)
 188                 dim_map->pos[1 + exp->pos[i]] = 1 + i;
 189
 190         return dim_map;
 191 }