isl_multi_dims.c

   1 /*
   2  * Copyright 2011      Sven Verdoolaege
   3  * Copyright 2012-2013 Ecole Normale Superieure
   4  *
   5  * Use of this software is governed by the MIT license
   6  *
   7  * Written by Sven Verdoolaege,
   8  * Ecole Normale Superieure, 45 rue d'Ulm, 75230 Paris, France
   9  */
  10
  11 #include <isl_space_private.h>
  12
  13 #include <isl_multi_macro.h>
  14
  15 /* Check whether "multi" has non-zero coefficients for any dimension
  16  * in the given range or if any of these dimensions appear
  17  * with non-zero coefficients in any of the integer divisions involved.
  18  */
  19 isl_bool FN(MULTI(BASE),involves_dims)(__isl_keep MULTI(BASE) *multi,
  20         enum isl_dim_type type, unsigned first, unsigned n)
  21 {
  22         int i;
  23
  24         if (!multi)
  25                 return isl_bool_error;
  26         if (multi->n == 0 || n == 0)
  27                 return isl_bool_false;
  28
  29         for (i = 0; i < multi->n; ++i) {
  30                 isl_bool involves;
  31
  32                 involves = FN(EL,involves_dims)(multi->u.p[i], type, first, n);
  33                 if (involves < 0 || involves)
  34                         return involves;
  35         }
  36
  37         return isl_bool_false;
  38 }
  39
  40 __isl_give MULTI(BASE) *FN(MULTI(BASE),insert_dims)(
  41         __isl_take MULTI(BASE) *multi,
  42         enum isl_dim_type type, unsigned first, unsigned n)
  43 {
  44         int i;
  45
  46         if (!multi)
  47                 return NULL;
  48         if (type == isl_dim_out)
  49                 isl_die(FN(MULTI(BASE),get_ctx)(multi), isl_error_invalid,
  50                         "cannot insert output/set dimensions",
  51                         return FN(MULTI(BASE),free)(multi));
  52         if (n == 0 && !isl_space_is_named_or_nested(multi->space, type))
  53                 return multi;
  54
  55         multi = FN(MULTI(BASE),cow)(multi);
  56         if (!multi)
  57                 return NULL;
  58
  59         multi->space = isl_space_insert_dims(multi->space, type, first, n);
  60         if (!multi->space)
  61                 return FN(MULTI(BASE),free)(multi);
  62
  63         for (i = 0; i < multi->n; ++i) {
  64                 multi->u.p[i] = FN(EL,insert_dims)(multi->u.p[i],
  65                                                         type, first, n);
  66                 if (!multi->u.p[i])
  67                         return FN(MULTI(BASE),free)(multi);
  68         }
  69
  70         return multi;
  71 }
  72
  73 __isl_give MULTI(BASE) *FN(MULTI(BASE),add_dims)(__isl_take MULTI(BASE) *multi,
  74         enum isl_dim_type type, unsigned n)
  75 {
  76         unsigned pos;
  77
  78         pos = FN(MULTI(BASE),dim)(multi, type);
  79
  80         return FN(MULTI(BASE),insert_dims)(multi, type, pos, n);
  81 }
  82
  83 /* Project the domain of "multi" onto its parameter space.
  84  * "multi" may not involve any of the domain dimensions.
  85  */
  86 __isl_give MULTI(BASE) *FN(MULTI(BASE),project_domain_on_params)(
  87         __isl_take MULTI(BASE) *multi)
  88 {
  89         unsigned n;
  90         isl_bool involves;
  91         isl_space *space;
  92
  93         n = FN(MULTI(BASE),dim)(multi, isl_dim_in);
  94         involves = FN(MULTI(BASE),involves_dims)(multi, isl_dim_in, 0, n);
  95         if (involves < 0)
  96                 return FN(MULTI(BASE),free)(multi);
  97         if (involves)
  98                 isl_die(FN(MULTI(BASE),get_ctx)(multi), isl_error_invalid,
  99                     "expression involves some of the domain dimensions",
 100                     return FN(MULTI(BASE),free)(multi));
 101         multi = FN(MULTI(BASE),drop_dims)(multi, isl_dim_in, 0, n);
 102         space = FN(MULTI(BASE),get_domain_space)(multi);
 103         space = isl_space_params(space);
 104         multi = FN(MULTI(BASE),reset_domain_space)(multi, space);
 105         return multi;
 106 }