add isl_aff_mod_val

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

diff --git a/isl_map_subtract.c b/isl_map_subtract.c
index f5ed8d6..2c958c7 100644 (file)
--- a/isl_map_subtract.c
+++ b/isl_map_subtract.c
@@ -1,7 +1,7 @@
 /*
  * Copyright 2008-2009 Katholieke Universiteit Leuven
  *
- * Use of this software is governed by the GNU LGPLv2.1 license
+ * Use of this software is governed by the MIT license
  *
  * Written by Sven Verdoolaege, K.U.Leuven, Departement
  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
@@ -326,6 +326,8 @@ static int basic_map_collect_diff(__isl_take isl_basic_map *bmap,
        map = isl_map_order_divs(map);
 
        tab = isl_tab_from_basic_map(bmap, 1);
+       if (!tab)
+               goto error;
 
        modified = 0;
        level = 0;
@@ -775,6 +777,8 @@ static int map_is_singleton_subset(__isl_keep isl_map *map1,
 static int map_is_subset(__isl_keep isl_map *map1, __isl_keep isl_map *map2)
 {
        int is_subset = 0;
+       int empty;
+       int rat1, rat2;
 
        if (!map1 || !map2)
                return -1;
@@ -782,10 +786,23 @@ static int map_is_subset(__isl_keep isl_map *map1, __isl_keep isl_map *map2)
        if (!isl_map_has_equal_space(map1, map2))
                return 0;
 
-       if (isl_map_is_empty(map1))
+       empty = isl_map_is_empty(map1);
+       if (empty < 0)
+               return -1;
+       if (empty)
                return 1;
 
-       if (isl_map_is_empty(map2))
+       empty = isl_map_is_empty(map2);
+       if (empty < 0)
+               return -1;
+       if (empty)
+               return 0;
+
+       rat1 = isl_map_has_rational(map1);
+       rat2 = isl_map_has_rational(map2);
+       if (rat1 < 0 || rat2 < 0)
+               return -1;
+       if (rat1 && !rat2)
                return 0;
 
        if (isl_map_plain_is_universe(map2))