--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/20030804-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,75 @@
+/* Copyright (C) 2003 Free Software Foundation.
+
+   Check that constant folding of mathematical expressions doesn't
+   break anything.
+
+   Written by Roger Sayle, 3rd August 2003.  */
+
+/* { dg-do link } */
+/* { dg-options "-O2 -ffast-math" } */
+
+extern void link_error(void);
+
+void test(double x)
+{
+  if (x+x != 2.0*x)
+    link_error ();
+  if (x+x != x*2.0)
+    link_error ();
+
+  if (x+x+x != 3.0*x)
+    link_error ();
+  if (x+x+x != x*3.0)
+    link_error ();
+
+  if ((x+x)+x != 3.0*x)
+    link_error ();
+  if ((x+x)+x != x*3.0)
+    link_error ();
+
+  if (x+(x+x) != 3.0*x)
+    link_error ();
+  if (x+(x+x) != x*3.0)
+    link_error ();
+
+  if (x+4.0*x != 5.0*x)
+    link_error ();
+  if (x+4.0*x != x*5.0)
+    link_error ();
+  if (x+x*4.0 != 5.0*x)
+    link_error ();
+  if (x+x*4.0 != x*5.0)
+    link_error ();
+  if (4.0*x+x != 5.0*x)
+    link_error ();
+  if (4.0*x+x != x*5.0)
+    link_error ();
+  if (x*4.0+x != 5.0*x)
+    link_error ();
+  if (x*4.0+x != x*5.0)
+    link_error ();
+
+  if (3.0*x + 5.0*x != 8.0*x)
+    link_error ();
+  if (3.0*x + 5.0*x != x*8.0)
+    link_error ();
+  if (x*3.0 + 5.0*x != 8.0*x)
+    link_error ();
+  if (x*3.0 + 5.0*x != x*8.0)
+    link_error ();
+  if (3.0*x + x*5.0 != 8.0*x)
+    link_error ();
+  if (3.0*x + x*5.0 != x*8.0)
+    link_error ();
+  if (x*3.0 + x*5.0 != 8.0*x)
+    link_error ();
+  if (x*3.0 + x*5.0 != x*8.0)
+    link_error ();
+}
+
+int main()
+{
+  test(2.0);
+  return 0;
+}
+