--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/vect/vect-over-widen-7.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,54 @@
+/* { dg-require-effective-target vect_int } */
+/* { dg-require-effective-target vect_shift } */
+/* { dg-require-effective-target vect_pack_trunc } */
+/* { dg-require-effective-target vect_unpack } */
+
+#include "tree-vect.h"
+
+#ifndef SIGNEDNESS
+#define SIGNEDNESS signed
+#define BASE_B -128
+#define BASE_C -100
+#define D -120
+#endif
+
+#define N 50
+
+/* Both range analysis and backward propagation from the truncation show
+   that these calculations can be done in SIGNEDNESS short.  */
+void __attribute__ ((noipa))
+f (SIGNEDNESS char *restrict a, SIGNEDNESS char *restrict b,
+   SIGNEDNESS char *restrict c, SIGNEDNESS char d)
+{
+  int promoted_d = d;
+  for (int i = 0; i < N; ++i)
+    /* Deliberate use of signed >>.  */
+    a[i] = (b[i] + c[i] + promoted_d) >> 2;
+}
+
+int
+main (void)
+{
+  check_vect ();
+
+  SIGNEDNESS char a[N], b[N], c[N];
+  for (int i = 0; i < N; ++i)
+    {
+      b[i] = BASE_B + i * 5;
+      c[i] = BASE_C + i * 4;
+      asm volatile ("" ::: "memory");
+    }
+  f (a, b, c, D);
+  for (int i = 0; i < N; ++i)
+    if (a[i] != (BASE_B + BASE_C + D + i * 9) >> 2)
+      __builtin_abort ();
+
+  return 0;
+}
+
+/* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */
+/* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */
+/* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 2} "vect" } } */
+/* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */
+/* { dg-final { scan-tree-dump-not {vector[^ ]* int} "vect" } } */
+/* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */