isl_reordering.c

   1 /*
   2  * Copyright 2010      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_ctx_private.h>
  12 #include <isl_space_private.h>
  13 #include <isl_reordering.h>
  14
  15 __isl_give isl_reordering *isl_reordering_alloc(isl_ctx *ctx, int len)
  16 {
  17         isl_reordering *exp;
  18
  19         exp = isl_alloc(ctx, struct isl_reordering,
  20                         sizeof(struct isl_reordering) + (len - 1) * sizeof(int));
  21         if (!exp)
  22                 return NULL;
  23
  24         exp->ref = 1;
  25         exp->len = len;
  26         exp->dim = NULL;
  27
  28         return exp;
  29 }
  30
  31 __isl_give isl_reordering *isl_reordering_copy(__isl_keep isl_reordering *exp)
  32 {
  33         if (!exp)
  34                 return NULL;
  35
  36         exp->ref++;
  37         return exp;
  38 }
  39
  40 __isl_give isl_reordering *isl_reordering_dup(__isl_keep isl_reordering *r)
  41 {
  42         int i;
  43         isl_reordering *dup;
  44
  45         if (!r)
  46                 return NULL;
  47
  48         dup = isl_reordering_alloc(r->dim->ctx, r->len);
  49         if (!dup)
  50                 return NULL;
  51
  52         dup->dim = isl_space_copy(r->dim);
  53         if (!dup->dim)
  54                 return isl_reordering_free(dup);
  55         for (i = 0; i < dup->len; ++i)
  56                 dup->pos[i] = r->pos[i];
  57
  58         return dup;
  59 }
  60
  61 __isl_give isl_reordering *isl_reordering_cow(__isl_take isl_reordering *r)
  62 {
  63         if (!r)
  64                 return NULL;
  65
  66         if (r->ref == 1)
  67                 return r;
  68         r->ref--;
  69         return isl_reordering_dup(r);
  70 }
  71
  72 void *isl_reordering_free(__isl_take isl_reordering *exp)
  73 {
  74         if (!exp)
  75                 return NULL;
  76
  77         if (--exp->ref > 0)
  78                 return NULL;
  79
  80         isl_space_free(exp->dim);
  81         free(exp);
  82         return NULL;
  83 }
  84
  85 /* Construct a reordering that maps the parameters of "alignee"
  86  * to the corresponding parameters in a new dimension specification
  87  * that has the parameters of "aligner" first, followed by
  88  * any remaining parameters of "alignee" that do not occur in "aligner".
  89  */
  90 __isl_give isl_reordering *isl_parameter_alignment_reordering(
  91         __isl_keep isl_space *alignee, __isl_keep isl_space *aligner)
  92 {
  93         int i, j;
  94         isl_reordering *exp;
  95
  96         if (!alignee || !aligner)
  97                 return NULL;
  98
  99         exp = isl_reordering_alloc(alignee->ctx, alignee->nparam);
 100         if (!exp)
 101                 return NULL;
 102
 103         exp->dim = isl_space_copy(aligner);
 104
 105         for (i = 0; i < alignee->nparam; ++i) {
 106                 isl_id *id_i;
 107                 id_i = isl_space_get_dim_id(alignee, isl_dim_param, i);
 108                 if (!id_i)
 109                         isl_die(alignee->ctx, isl_error_invalid,
 110                                 "cannot align unnamed parameters", goto error);
 111                 for (j = 0; j < aligner->nparam; ++j) {
 112                         isl_id *id_j;
 113                         id_j = isl_space_get_dim_id(aligner, isl_dim_param, j);
 114                         isl_id_free(id_j);
 115                         if (id_i == id_j)
 116                                 break;
 117                 }
 118                 if (j < aligner->nparam) {
 119                         exp->pos[i] = j;
 120                         isl_id_free(id_i);
 121                 } else {
 122                         int pos;
 123                         pos = isl_space_dim(exp->dim, isl_dim_param);
 124                         exp->dim = isl_space_add_dims(exp->dim, isl_dim_param, 1);
 125                         exp->dim = isl_space_set_dim_id(exp->dim,
 126                                                 isl_dim_param, pos, id_i);
 127                         exp->pos[i] = pos;
 128                 }
 129         }
 130
 131         return exp;
 132 error:
 133         isl_reordering_free(exp);
 134         return NULL;
 135 }
 136
 137 __isl_give isl_reordering *isl_reordering_extend(__isl_take isl_reordering *exp,
 138         unsigned extra)
 139 {
 140         int i;
 141         isl_reordering *res;
 142         int offset;
 143
 144         if (!exp)
 145                 return NULL;
 146         if (extra == 0)
 147                 return exp;
 148
 149         offset = isl_space_dim(exp->dim, isl_dim_all) - exp->len;
 150         res = isl_reordering_alloc(exp->dim->ctx, exp->len + extra);
 151         if (!res)
 152                 goto error;
 153         res->dim = isl_space_copy(exp->dim);
 154         for (i = 0; i < exp->len; ++i)
 155                 res->pos[i] = exp->pos[i];
 156         for (i = exp->len; i < res->len; ++i)
 157                 res->pos[i] = offset + i;
 158
 159         isl_reordering_free(exp);
 160
 161         return res;
 162 error:
 163         isl_reordering_free(exp);
 164         return NULL;
 165 }
 166
 167 __isl_give isl_reordering *isl_reordering_extend_space(
 168         __isl_take isl_reordering *exp, __isl_take isl_space *dim)
 169 {
 170         isl_reordering *res;
 171
 172         if (!exp || !dim)
 173                 goto error;
 174
 175         res = isl_reordering_extend(isl_reordering_copy(exp),
 176                                     isl_space_dim(dim, isl_dim_all) - exp->len);
 177         res = isl_reordering_cow(res);
 178         if (!res)
 179                 goto error;
 180         isl_space_free(res->dim);
 181         res->dim = isl_space_replace(dim, isl_dim_param, exp->dim);
 182
 183         isl_reordering_free(exp);
 184
 185         return res;
 186 error:
 187         isl_reordering_free(exp);
 188         isl_space_free(dim);
 189         return NULL;
 190 }
 191
 192 void isl_reordering_dump(__isl_keep isl_reordering *exp)
 193 {
 194         int i;
 195
 196         for (i = 0; i < exp->len; ++i)
 197                 fprintf(stderr, "%d -> %d; ", i, exp->pos[i]);
 198         fprintf(stderr, "\n");
 199 }