add isl_map_neg

diff --git a/include/isl_map.h b/include/isl_map.h
index 042010d..80c4b49 100644 (file)
--- a/include/isl_map.h
+++ b/include/isl_map.h
@@ -176,6 +176,8 @@ struct isl_basic_map *isl_basic_map_neg(struct isl_basic_map *bmap);
 struct isl_basic_map *isl_basic_map_floordiv(struct isl_basic_map *bmap,
                isl_int d);
 
+struct isl_map *isl_map_neg(struct isl_map *map);
+
 int isl_basic_map_is_equal(
                struct isl_basic_map *bmap1, struct isl_basic_map *bmap2);
 

diff --git a/isl_map.c b/isl_map.c
index 0477eaa..f385e5b 100644 (file)
--- a/isl_map.c
+++ b/isl_map.c
@@ -2069,6 +2069,28 @@ struct isl_basic_map *isl_basic_map_neg(struct isl_basic_map *bmap)
        return isl_basic_map_finalize(bmap);
 }
 
+/* Given a map A -> f(A), construct A -> -f(A).
+ */
+struct isl_map *isl_map_neg(struct isl_map *map)
+{
+       int i;
+
+       map = isl_map_cow(map);
+       if (!map)
+               return NULL;
+
+       for (i = 0; i < map->n; ++i) {
+               map->p[i] = isl_basic_map_neg(map->p[i]);
+               if (!map->p[i])
+                       goto error;
+       }
+
+       return map;
+error:
+       isl_map_free(map);
+       return NULL;
+}
+
 /* Given a basic map A -> f(A) and an integer d, construct a basic map
  * A -> floor(f(A)/d).
  */