isl_basic_map_lexmin: turn off equality detection on non-parametric problems

[platform/upstream/isl.git] / isl_tab_pip.c

diff --git a/isl_tab_pip.c b/isl_tab_pip.c
index d09330f..22ab3dd 100644 (file)
--- a/isl_tab_pip.c
+++ b/isl_tab_pip.c
@@ -10,6 +10,7 @@
  * ZAC des vignes, 4 rue Jacques Monod, 91893 Orsay, France 
  */
 
+#include <isl_ctx_private.h>
 #include "isl_map_private.h"
 #include <isl/seq.h>
 #include "isl_tab.h"
@@ -39,7 +40,7 @@
  * then the initial sample value may be chosen equal to zero.
  * However, we will not make this assumption.  Instead, we apply
  * the "big parameter" trick.  Any variable x is then not directly
- * used in the tableau, but instead it its represented by another
+ * used in the tableau, but instead it is represented by another
  * variable x' = M + x, where M is an arbitrarily large (positive)
  * value.  x' is therefore always non-negative, whatever the value of x.
  * Taking as initial sample value x' = 0 corresponds to x = -M,
@@ -4431,6 +4432,9 @@ struct isl_map *isl_tab_basic_map_partial_lexopt(
        isl_assert(bmap->ctx,
            isl_basic_map_compatible_domain(bmap, dom), goto error);
 
+       if (isl_basic_set_dim(dom, isl_dim_all) == 0)
+               return basic_map_partial_lexopt(bmap, dom, empty, max);
+
        bmap = isl_basic_map_intersect_domain(bmap, isl_basic_set_copy(dom));
        bmap = isl_basic_map_detect_equalities(bmap);
        bmap = isl_basic_map_remove_redundancies(bmap);