isl_band.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_band_private.h>
  12 #include <isl_schedule_private.h>
  13 #include <isl_list_private.h>
  14
  15 isl_ctx *isl_band_get_ctx(__isl_keep isl_band *band)
  16 {
  17         return band ? isl_union_map_get_ctx(band->map) : NULL;
  18 }
  19
  20 /* We not only increment the reference count of the band,
  21  * but also that of the schedule that contains this band.
  22  * This ensures that the schedule won't disappear while there
  23  * is still a reference to the band outside of the schedule.
  24  * There is no need to increment the reference count of the parent
  25  * band as the parent band is part of the same schedule.
  26  */
  27 __isl_give isl_band *isl_band_copy(__isl_keep isl_band *band)
  28 {
  29         if (!band)
  30                 return NULL;
  31
  32         band->ref++;
  33         band->schedule->ref++;
  34         return band;
  35 }
  36
  37 /* If this is not the last reference to the band (the one from within the
  38  * schedule), then we also need to decrement the reference count of the
  39  * containing schedule as it was incremented in isl_band_copy.
  40  */
  41 void *isl_band_free(__isl_take isl_band *band)
  42 {
  43         if (!band)
  44                 return NULL;
  45
  46         if (--band->ref > 0)
  47                 return isl_schedule_free(band->schedule);
  48
  49         isl_union_map_free(band->map);
  50         isl_band_list_free(band->children);
  51         free(band->zero);
  52         free(band);
  53
  54         return NULL;
  55 }
  56
  57 int isl_band_has_children(__isl_keep isl_band *band)
  58 {
  59         if (!band)
  60                 return -1;
  61
  62         return band->children != NULL;
  63 }
  64
  65 __isl_give isl_band_list *isl_band_get_children(
  66         __isl_keep isl_band *band)
  67 {
  68         if (!band)
  69                 return NULL;
  70         if (!band->children)
  71                 isl_die(isl_band_get_ctx(band), isl_error_invalid,
  72                         "band has no children", return NULL);
  73         return isl_band_list_dup(band->children);
  74 }
  75
  76 int isl_band_n_member(__isl_keep isl_band *band)
  77 {
  78         return band ? band->n : 0;
  79 }
  80
  81 /* Is the given scheduling dimension zero distance within the band and
  82  * with respect to the proximity dependences.
  83  */
  84 int isl_band_member_is_zero_distance(__isl_keep isl_band *band, int pos)
  85 {
  86         if (!band)
  87                 return -1;
  88
  89         if (pos < 0 || pos >= band->n)
  90                 isl_die(isl_band_get_ctx(band), isl_error_invalid,
  91                         "invalid member position", return -1);
  92
  93         return band->zero[pos];
  94 }
  95
  96 /* Return the schedule that leads up to this band.
  97  */
  98 __isl_give isl_union_map *isl_band_get_prefix_schedule(
  99         __isl_keep isl_band *band)
 100 {
 101         isl_union_map *prefix;
 102         isl_band *a;
 103
 104         if (!band)
 105                 return NULL;
 106
 107         prefix = isl_union_map_copy(band->map);
 108         prefix = isl_union_map_from_domain(isl_union_map_domain(prefix));
 109
 110         for (a = band->parent; a; a = a->parent) {
 111                 isl_union_map *partial = isl_union_map_copy(a->map);
 112                 prefix = isl_union_map_flat_range_product(partial, prefix);
 113         }
 114
 115         return prefix;
 116 }
 117
 118 /* Return the schedule of the band in isolation.
 119  */
 120 __isl_give isl_union_map *isl_band_get_partial_schedule(
 121         __isl_keep isl_band *band)
 122 {
 123         return band ? isl_union_map_copy(band->map) : NULL;
 124 }
 125
 126 /* Return the schedule for the forest underneath the given band.
 127  */
 128 __isl_give isl_union_map *isl_band_get_suffix_schedule(
 129         __isl_keep isl_band *band)
 130 {
 131         isl_union_map *suffix;
 132
 133         if (!band)
 134                 return NULL;
 135
 136         if (!isl_band_has_children(band)) {
 137                 suffix = isl_union_map_copy(band->map);
 138                 suffix = isl_union_map_from_domain(isl_union_map_domain(suffix));
 139         } else {
 140                 int i, n;
 141                 isl_band_list *children;
 142
 143                 suffix = isl_union_map_empty(isl_union_map_get_space(band->map));
 144                 children = isl_band_get_children(band);
 145                 n = isl_band_list_n_band(children);
 146                 for (i = 0; i < n; ++i) {
 147                         isl_band *child;
 148                         isl_union_map *partial_i;
 149                         isl_union_map *suffix_i;
 150
 151                         child = isl_band_list_get_band(children, i);
 152                         partial_i = isl_band_get_partial_schedule(child);
 153                         suffix_i = isl_band_get_suffix_schedule(child);
 154                         suffix_i = isl_union_map_flat_range_product(partial_i,
 155                                                                     suffix_i);
 156                         suffix = isl_union_map_union(suffix, suffix_i);
 157
 158                         isl_band_free(child);
 159                 }
 160                 isl_band_list_free(children);
 161         }
 162
 163         return suffix;
 164 }
 165
 166 __isl_give isl_printer *isl_printer_print_band(__isl_take isl_printer *p,
 167         __isl_keep isl_band *band)
 168 {
 169         isl_union_map *prefix, *partial, *suffix;
 170
 171         prefix = isl_band_get_prefix_schedule(band);
 172         partial = isl_band_get_partial_schedule(band);
 173         suffix = isl_band_get_suffix_schedule(band);
 174
 175         p = isl_printer_print_str(p, "(");
 176         p = isl_printer_print_union_map(p, prefix);
 177         p = isl_printer_print_str(p, ",");
 178         p = isl_printer_print_union_map(p, partial);
 179         p = isl_printer_print_str(p, ",");
 180         p = isl_printer_print_union_map(p, suffix);
 181         p = isl_printer_print_str(p, ")");
 182
 183         isl_union_map_free(prefix);
 184         isl_union_map_free(partial);
 185         isl_union_map_free(suffix);
 186
 187         return p;
 188 }