isl_div.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 license
   5  *
   6  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   7  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   8  */
   9
  10 #include <isl_div.h>
  11 #include <isl_map.h>
  12 #include "isl_map_private.h"
  13 #include "isl_seq.h"
  14
  15 static unsigned n(struct isl_div *d, enum isl_dim_type type)
  16 {
  17         struct isl_dim *dim = d->bmap->dim;
  18         switch (type) {
  19         case isl_dim_param:     return dim->nparam;
  20         case isl_dim_in:        return dim->n_in;
  21         case isl_dim_out:       return dim->n_out;
  22         case isl_dim_div:       return d->bmap->n_div;
  23         }
  24 }
  25
  26 static unsigned offset(struct isl_div *d, enum isl_dim_type type)
  27 {
  28         struct isl_dim *dim = d->bmap->dim;
  29         switch (type) {
  30         case isl_dim_param: return 1 + 1;
  31         case isl_dim_in:    return 1 + 1 + dim->nparam;
  32         case isl_dim_out:   return 1 + 1 + dim->nparam + dim->n_in;
  33         case isl_dim_div:   return 1 + 1 + dim->nparam + dim->n_in + dim->n_out;
  34         }
  35 }
  36
  37 struct isl_div *isl_basic_map_div(struct isl_basic_map *bmap, int pos)
  38 {
  39         struct isl_div *div;
  40
  41         if (!bmap)
  42                 goto error;
  43
  44         isl_assert(bmap->ctx, pos < bmap->n_div, goto error);
  45
  46         div = isl_alloc_type(bmap->ctx, struct isl_div);
  47         if (!div)
  48                 goto error;
  49
  50         div->ctx = bmap->ctx;
  51         isl_ctx_ref(div->ctx);
  52         div->ref = 1;
  53         div->bmap = bmap;
  54         div->line = &bmap->div[pos];
  55
  56         return div;
  57 error:
  58         isl_basic_map_free(bmap);
  59         return NULL;
  60 }
  61
  62 struct isl_div *isl_basic_set_div(struct isl_basic_set *bset, int pos)
  63 {
  64         return isl_basic_map_div((struct isl_basic_map *)bset, pos);
  65 }
  66
  67 struct isl_div *isl_div_alloc(struct isl_dim *dim)
  68 {
  69         struct isl_basic_map *bmap;
  70
  71         if (!dim)
  72                 return NULL;
  73
  74         bmap = isl_basic_map_alloc_dim(dim, 1, 0, 0);
  75         if (!bmap)
  76                 return NULL;
  77
  78         isl_basic_map_alloc_div(bmap);
  79         isl_seq_clr(bmap->div[0], 1 + 1 + isl_basic_map_total_dim(bmap));
  80         return isl_basic_map_div(bmap, 0);
  81 }
  82
  83 void isl_div_free(struct isl_div *c)
  84 {
  85         if (!c)
  86                 return;
  87
  88         if (--c->ref > 0)
  89                 return;
  90
  91         isl_basic_map_free(c->bmap);
  92         isl_ctx_deref(c->ctx);
  93         free(c);
  94 }
  95
  96 void isl_div_get_constant(struct isl_div *div, isl_int *v)
  97 {
  98         if (!div)
  99                 return;
 100         isl_int_set(*v, div->line[0][1]);
 101 }
 102
 103 void isl_div_get_denominator(struct isl_div *div, isl_int *v)
 104 {
 105         if (!div)
 106                 return;
 107         isl_int_set(*v, div->line[0][0]);
 108 }
 109
 110 void isl_div_get_coefficient(struct isl_div *div,
 111         enum isl_dim_type type, int pos, isl_int *v)
 112 {
 113         if (!div)
 114                 return;
 115
 116         isl_assert(div->ctx, pos < n(div, type), return);
 117         isl_int_set(*v, div->line[0][offset(div, type) + pos]);
 118 }
 119
 120 void isl_div_set_constant(struct isl_div *div, isl_int v)
 121 {
 122         if (!div)
 123                 return;
 124         isl_int_set(div->line[0][1], v);
 125 }
 126
 127 void isl_div_set_denominator(struct isl_div *div, isl_int v)
 128 {
 129         if (!div)
 130                 return;
 131         isl_int_set(div->line[0][0], v);
 132 }
 133
 134 void isl_div_set_coefficient(struct isl_div *div,
 135         enum isl_dim_type type, int pos, isl_int v)
 136 {
 137         if (!div)
 138                 return;
 139
 140         isl_assert(div->ctx, pos < n(div, type), return);
 141         isl_int_set(div->line[0][offset(div, type) + pos], v);
 142 }