--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/vect/vect-nb-iter-ub-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,30 @@
+/* { dg-additional-options "-fdump-tree-cunroll-details" } */
+
+#include "tree-vect.h"
+
+int ii[31];
+char cc[31] =
+  { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
+    20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 };
+
+void __attribute__((noinline,noclone))
+foo (int s)
+{
+  int i;
+  for (i = 0; i < s; i++)
+    ii[i] = (int) cc[i];
+}
+
+int main (int argc, const char **argv)
+{
+  int i;
+  check_vect ();
+  foo (31);
+  for (i = 0; i < 31; i++)
+    if (ii[i] != i)
+      __builtin_abort ();
+}
+
+/* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" { target { i?86-*-* x86_64-*-* } } } } */
+/* { dg-final { scan-tree-dump "loop turned into non-loop; it never loops" "cunroll" { target { i?86-*-* x86_64-*-* } } } } */
+/* { dg-final { scan-tree-dump-not "loop with 2 iterations completely unrolled" "cunroll" { target { i?86-*-* x86_64-*-* } } } } */