From: Sven Verdoolaege <skimo@kotnet.org>
Date: Mon, 25 Oct 2010 11:37:04 +0000 (+0200)
Subject: isl_map_gist_basic_map: drop empty pieces in result
X-Git-Tag: isl-0.05~100
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=557655132fa1e45ca9a21366ea24989af11b09c9;p=platform%2Fupstream%2Fisl.git

isl_map_gist_basic_map: drop empty pieces in result

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

diff --git a/isl_map_simplify.c b/isl_map_simplify.c
index d0199c8..2d1179b 100644
--- a/isl_map_simplify.c
+++ b/isl_map_simplify.c
@@ -1870,11 +1870,17 @@ __isl_give isl_map *isl_map_gist_basic_map(__isl_take isl_map *map,
 	map = isl_map_compute_divs(map);
 	for (i = 0; i < map->n; ++i)
 		context = isl_basic_map_align_divs(context, map->p[i]);
-	for (i = 0; i < map->n; ++i) {
+	for (i = map->n - 1; i >= 0; --i) {
 		map->p[i] = isl_basic_map_gist(map->p[i],
 						isl_basic_map_copy(context));
 		if (!map->p[i])
 			goto error;
+		if (isl_basic_map_fast_is_empty(map->p[i])) {
+			isl_basic_map_free(map->p[i]);
+			if (i != map->n - 1)
+				map->p[i] = map->p[map->n - 1];
+			map->n--;
+		}
 	}
 	isl_basic_map_free(context);
 	ISL_F_CLR(map, ISL_MAP_NORMALIZED);