[PATCH 2/6] gimple-ssa-store-merging.c: fix sort_by_bitpos

[Alexander Monakov]

This qsort comparator lacks anti-commutativity and can indicate
A < B < A if A and B have the same bitpos.  Return 0 in that case.

        * gimple-ssa-store-merging.c (sort_by_bitpos): Return 0 on equal bitpos.
---
 gcc/gimple-ssa-store-merging.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/gcc/gimple-ssa-store-merging.c b/gcc/gimple-ssa-store-merging.c
index 64b8351..c99960b 100644
--- a/gcc/gimple-ssa-store-merging.c
+++ b/gcc/gimple-ssa-store-merging.c
@@ -516,12 +516,12 @@ sort_by_bitpos (const void *x, const void *y)
   store_immediate_info *const *tmp = (store_immediate_info * const *) x;
   store_immediate_info *const *tmp2 = (store_immediate_info * const *) y;
 
-  if ((*tmp)->bitpos <= (*tmp2)->bitpos)
+  if ((*tmp)->bitpos < (*tmp2)->bitpos)
     return -1;
   else if ((*tmp)->bitpos > (*tmp2)->bitpos)
     return 1;
-
-  gcc_unreachable ();
+  else
+    return 0;
 }
 
 /* Sorting function for store_immediate_info objects.
-- 
1.8.3.1