--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/vect/vect-bswap16.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,45 @@
+/* { dg-require-effective-target vect_bswap } */
+
+#include "tree-vect.h"
+
+#define N 128
+
+volatile int y = 0;
+
+static inline void
+vfoo16 (unsigned short int* a)
+{
+  int i = 0;
+  for (i = 0; i < N; ++i)
+    a[i] = __builtin_bswap16 (a[i]);
+}
+
+int
+main (void)
+{
+  unsigned short arr[N];
+  unsigned short expect[N];
+  int i;
+
+  check_vect ();
+
+  for (i = 0; i < N; ++i)
+    {
+      arr[i] = i;
+      expect[i] = __builtin_bswap16 (i);
+      if (y) /* Avoid vectorisation.  */
+        abort ();
+    }
+
+  vfoo16 (arr);
+
+  for (i = 0; i < N; ++i)
+    {
+      if (arr[i] != expect[i])
+        abort ();
+    }
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */