--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/vect/vect-avg-16.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,52 @@
+/* { dg-additional-options "-O3" } */
+/* { dg-require-effective-target vect_int } */
+
+#include "tree-vect.h"
+
+#define N 80
+
+void __attribute__ ((noipa))
+f (signed char *restrict a, signed char *restrict b,
+   signed char *restrict c, int n)
+{
+  for (int j = 0; j < n; ++j)
+    {
+      for (int i = 0; i < 16; ++i)
+	a[i] = (b[i] + c[i]) >> 1;
+      a += 20;
+      b += 20;
+      c += 20;
+    }
+}
+
+#define BASE1 -126
+#define BASE2 -42
+
+signed char a[N], b[N], c[N];
+
+int
+main (void)
+{
+  check_vect ();
+
+  for (int i = 0; i < N; ++i)
+    {
+      a[i] = i;
+      b[i] = BASE1 + i * 3;
+      c[i] = BASE2 + i * 2;
+      asm volatile ("" ::: "memory");
+    }
+  f (a, b, c, N / 20);
+  for (int i = 0; i < N; ++i)
+    {
+      int d = (BASE1 + BASE2 + i * 5) >> 1;
+      if (a[i] != (i % 20 < 16 ? d : i))
+	__builtin_abort ();
+    }
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump "vect_recog_average_pattern: detected" "vect" } } */
+/* { dg-final { scan-tree-dump {\.AVG_FLOOR} "vect" { target vect_avg_qi } } } */
+/* { dg-final { scan-tree-dump "Loop contains only SLP stmts" "vect" { target vect_avg_qi } } } */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" { target vect_avg_qi } } } */