isl_basic_map_compute_divs: only (re)compute divs if any div is unknown

diff --git a/isl_map.c b/isl_map.c
index c7146f1..ebe4e39 100644 (file)
--- a/isl_map.c
+++ b/isl_map.c
@@ -3515,11 +3515,22 @@ error:
 
 struct isl_map *isl_basic_map_compute_divs(struct isl_basic_map *bmap)
 {
+       int i;
+       unsigned off;
+
        if (!bmap)
                return NULL;
-       if (bmap->n_div == 0)
-               return isl_map_from_basic_map(bmap);
-       return isl_pip_basic_map_compute_divs(bmap);
+       off = isl_dim_total(bmap->dim);
+       for (i = 0; i < bmap->n_div; ++i) {
+               if (isl_int_is_zero(bmap->div[i][0]))
+                       return isl_pip_basic_map_compute_divs(bmap);
+               isl_assert(bmap->ctx, isl_int_is_zero(bmap->div[i][1+1+off+i]),
+                               goto error);
+       }
+       return isl_map_from_basic_map(bmap);
+error:
+       isl_basic_map_free(bmap);
+       return NULL;
 }
 
 struct isl_map *isl_map_compute_divs(struct isl_map *map)