diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index cce4d3ddb9b..1fba2d92215 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,8 @@
 2018-04-17  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/85431
+	* dse.c (record_store): Ignore zero width stores.
+
 	PR sanitizer/85230
 	* asan.c (handle_builtin_stack_restore): Adjust comment.  Emit
 	__asan_allocas_unpoison call and last_alloca_addr = new_sp before
diff --git a/gcc/dse.c b/gcc/dse.c
index 1ef8f642719..26c6007b9ed 100644
--- a/gcc/dse.c
+++ b/gcc/dse.c
@@ -1417,6 +1417,9 @@ record_store (rtx body, bb_info_t bb_info)
       return 0;
     }
 
+  if (known_eq (width, 0))
+    return 0;
+
   if (group_id >= 0)
     {
       /* In the restrictive case where the base is a constant or the