gimple-ssa-store-merging.c: fix sort_by_bitpos

	* gimple-ssa-store-merging.c (sort_by_bitpos): Return 0 on equal bitpos.

From-SVN: r250394

gcc/ChangeLog

-2017-07-18  Jan Hubicka  <hubicka@ucw.cz>
+2017-07-20  Alexander Monakov  <amonakov@ispras.ru>
+
+	* gimple-ssa-store-merging.c (sort_by_bitpos): Return 0 on equal bitpos.
+
+2017-07-20  Jan Hubicka  <hubicka@ucw.cz>
 
 	* bb-reorder.c (connect_traces): Allow copying of blocks within
 	single partition.

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.