isl_pw_aff_zero_set: return a rational set if the input is marked rational

Signed-off-by: Sven Verdoolaege <skimo@kotnet.org>

diff --git a/isl_aff.c b/isl_aff.c
index 3338a3a..6517d68 100644 (file)
--- a/isl_aff.c
+++ b/isl_aff.c
@@ -1388,8 +1388,10 @@ __isl_give isl_basic_set *isl_aff_neg_basic_set(__isl_take isl_aff *aff)
 
 /* Return a basic set containing those elements in the space
  * of aff where it is zero.
+ * If "rational" is set, then return a rational basic set.
  */
-__isl_give isl_basic_set *isl_aff_zero_basic_set(__isl_take isl_aff *aff)
+static __isl_give isl_basic_set *aff_zero_basic_set(__isl_take isl_aff *aff,
+       int rational)
 {
        isl_constraint *ineq;
        isl_basic_set *bset;
@@ -1397,10 +1399,20 @@ __isl_give isl_basic_set *isl_aff_zero_basic_set(__isl_take isl_aff *aff)
        ineq = isl_equality_from_aff(aff);
 
        bset = isl_basic_set_from_constraint(ineq);
+       if (rational)
+               bset = isl_basic_set_set_rational(bset);
        bset = isl_basic_set_simplify(bset);
        return bset;
 }
 
+/* Return a basic set containing those elements in the space
+ * of aff where it is zero.
+ */
+__isl_give isl_basic_set *isl_aff_zero_basic_set(__isl_take isl_aff *aff)
+{
+       return aff_zero_basic_set(aff, 0);
+}
+
 /* Return a basic set containing those elements in the shared space
  * of aff1 and aff2 where aff1 is greater than or equal to aff2.
  */
@@ -1885,8 +1897,11 @@ static __isl_give isl_set *pw_aff_zero_set(__isl_take isl_pw_aff *pwaff,
        for (i = 0; i < pwaff->n; ++i) {
                isl_basic_set *bset;
                isl_set *set_i, *zero;
+               int rational;
 
-               bset = isl_aff_zero_basic_set(isl_aff_copy(pwaff->p[i].aff));
+               rational = isl_set_has_rational(pwaff->p[i].set);
+               bset = aff_zero_basic_set(isl_aff_copy(pwaff->p[i].aff),
+                                               rational);
                zero = isl_set_from_basic_set(bset);
                set_i = isl_set_copy(pwaff->p[i].set);
                if (complement)