--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/tree-ssa/vector-3.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-w -O1 -fdump-tree-optimized" } */
+
+#define vector __attribute((vector_size(16) ))
+vector float a;
+
+float f(float b)
+{
+  vector float c = {0, 0, 0, 0};
+  vector float d = {0, 0, 0, 0};
+  d += c;
+  return ((float*)&c)[2];
+}
+
+/* We should be able to optimize this to just "return 0.0;" */
+/* { dg-final { scan-tree-dump-times "BIT_FIELD_REF" 0 "optimized"} } */
+/* { dg-final { scan-tree-dump-times " 0\\\.0" 1 "optimized"} } */
+
+