--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/ext/unroll-1.C	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,19 @@
+// { dg-do compile }
+// { dg-options "-O2 -fdump-tree-cunrolli-details" }
+
+template <typename T>
+void
+foo (T *a, T *b, T *c)
+{
+#pragma GCC unroll 8
+  for (int i = 0; i < 8; i++)
+    a[i] = b[i] * c[i];
+}
+
+void
+bar (int *a, int *b, int *c)
+{
+  foo <int> (a, b, c);
+}
+
+// { dg-final { scan-tree-dump "loop with 8 iterations completely unrolled" "cunrolli" } }