--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/var-expand1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,28 @@
+/* { dg-do compile } */
+/* We don't (and don't want to) perform this optimisation on soft-float
+   targets, where each addition is a library call.  */
+/* { dg-require-effective-target hard_float } */
+/* { dg-options "-O2 -funroll-loops --fast-math -fvariable-expansion-in-unroller -fdump-rtl-loop2_unroll" } */
+/* { dg-additional-options "--param max-completely-peel-times=16  --param max-unroll-times=8" { target s390*-*-* } } */
+
+extern void abort (void);
+
+float array[30] = { 1,2,3,4,5,6,7,8,9,10 };
+
+int foo (int n)
+{
+  unsigned i;
+  float accum = 1.0;
+
+  for (i = 0; i < n; i++)
+    accum += array[i];
+
+  return accum;
+}
+
+int main (void)
+{
+  return foo (10);
+}
+
+/* { dg-final { scan-rtl-dump "Expanding Accumulator" "loop2_unroll" } } */