dataflow analysis: don't depend on word size during sorting of sources

The comparison routine would compute the difference between two
unsigned numbers, which would result in different signs depending
on the machine word size.

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

diff --git a/isl_flow.c b/isl_flow.c
index 9a269b2..821d8ef 100644 (file)
--- a/isl_flow.c
+++ b/isl_flow.c
@@ -188,7 +188,7 @@ static int access_sort_cmp(const void *p1, const void *p2)
 
        h1 = isl_map_get_hash(i1->source_map);
        h2 = isl_map_get_hash(i2->source_map);
-       return h1 - h2;
+       return h1 > h2 ? 1 : h1 < h2 ? -1 : 0;
 }
 
 /* Sort the must source accesses in order of increasing number of shared