isl_sample.c: extract out empty_sample

diff --git a/isl_sample.c b/isl_sample.c
index f66182f..4887ef6 100644 (file)
--- a/isl_sample.c
+++ b/isl_sample.c
@@ -6,6 +6,15 @@
 #include "isl_map_private.h"
 #include "isl_equalities.h"
 
+static struct isl_vec *empty_sample(struct isl_basic_set *bset)
+{
+       struct isl_vec *vec;
+
+       vec = isl_vec_alloc(bset->ctx, 0);
+       isl_basic_set_free(bset);
+       return vec;
+}
+
 /* Construct a zero sample of the same dimension as bset.
  * As a special case, if bset is zero-dimensional, this
  * function creates a zero-dimensional sample point.
@@ -56,7 +65,7 @@ static struct isl_vec *interval_sample(struct isl_ctx *ctx,
        isl_int_clear(t);
        if (i < bset->n_ineq) {
                isl_vec_free(sample);
-               sample = isl_vec_alloc(ctx, 0);
+               return empty_sample(bset);
        }
 
        isl_basic_set_free(bset);
@@ -153,10 +162,8 @@ struct isl_vec *isl_basic_set_sample(struct isl_basic_set *bset)
                return NULL;
 
        ctx = bset->ctx;
-       if (ISL_F_ISSET(bset, ISL_BASIC_SET_EMPTY)) {
-               isl_basic_set_free(bset);
-               return isl_vec_alloc(ctx, 0);
-       }
+       if (isl_basic_set_fast_is_empty(bset))
+               return empty_sample(bset);
 
        dim = isl_basic_set_n_dim(bset);
        isl_assert(ctx, isl_basic_set_n_param(bset) == 0, goto error);