--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/cilk-plus/CK/fib_no_sync.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,67 @@
+/* { dg-do run } */
+/* { dg-require-effective-target cilkplus_runtime } */
+/* { dg-options "-fcilkplus" } */
+
+#if HAVE_IO
+#include <stdio.h>
+#endif
+
+#define FIB_ITERATION 30
+
+int fib        (int);
+int fib_serial (int);
+
+int main(void)
+{
+  int ii = 0;
+  int fib_result[FIB_ITERATION+1], fib_serial_result[FIB_ITERATION+1];
+#if HAVE_IO
+
+  for (ii = 0; ii <= FIB_ITERATION; ii++)
+    printf("fib (%2d) = %10d\n", ii, fib (ii));
+#else
+  for (ii = 0; ii <= FIB_ITERATION; ii++)
+    {
+      fib_result[ii]        = fib (ii);
+    }
+
+  fib_serial_result[0] = 0;
+  fib_serial_result[1] = 1;
+  
+  for (ii = 2; ii <= FIB_ITERATION; ii++)
+    fib_serial_result[ii] = fib_serial_result[ii-1] + fib_serial_result[ii-2];
+  
+  for (ii = 0; ii <= FIB_ITERATION; ii++)
+    {
+      if (fib_result[ii] != fib_serial_result[ii])
+	__builtin_abort ();
+    }
+
+#endif
+  return 0;
+}
+
+int fib_serial (int n)
+{
+  int x = 0, y = 0;
+  if (n < 2)
+    return n;
+  else
+    {
+      x = fib_serial (n-1);
+      y = fib_serial (n-2);
+      return (x+y);
+    }
+}
+
+int fib(int n)
+{
+  if (n < 2) 
+    return n;
+  else
+  {
+    int x = _Cilk_spawn fib(n-1);
+    int y = fib(n-2);
+    return (x+y);
+  }
+}