--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/builtins-26.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,105 @@
+/* Copyright (C) 2003 Free Software Foundation.
+
+   Check that constant folding of built-in math functions doesn't
+   break anything and produces the expected results.
+
+   Written by Roger Sayle, 28th June 2003.  */
+
+/* { dg-do link } */
+/* { dg-options "-O2 -ffast-math" } */
+
+extern void link_error(void);
+
+extern double trunc(double);
+extern double floor(double);
+extern double ceil(double);
+
+extern float truncf(float);
+extern float floorf(float);
+extern float ceilf(float);
+
+extern long double truncl(long double);
+extern long double floorl(long double);
+extern long double ceill(long double);
+
+void test(double x)
+{
+  if (trunc (trunc (x)) != trunc (x))
+    link_error ();
+  if (trunc (floor (x)) != floor (x))
+    link_error ();
+  if (trunc (ceil (x)) != ceil (x))
+    link_error ();
+
+  if (floor (trunc (x)) != trunc (x))
+    link_error ();
+  if (floor (floor (x)) != floor (x))
+    link_error ();
+  if (floor (ceil (x)) != ceil (x))
+    link_error ();
+
+  if (ceil (trunc (x)) != trunc (x))
+    link_error ();
+  if (ceil (floor (x)) != floor (x))
+    link_error ();
+  if (ceil (ceil (x)) != ceil (x))
+    link_error ();
+}
+
+void testf(float x)
+{
+  if (truncf (truncf (x)) != truncf (x))
+    link_error ();
+  if (truncf (floorf (x)) != floorf (x))
+    link_error ();
+  if (truncf (ceilf (x)) != ceilf (x))
+    link_error ();
+
+  if (floorf (truncf (x)) != truncf (x))
+    link_error ();
+  if (floorf (floorf (x)) != floorf (x))
+    link_error ();
+  if (floorf (ceilf (x)) != ceilf (x))
+    link_error ();
+
+  if (ceilf (truncf (x)) != truncf (x))
+    link_error ();
+  if (ceilf (floorf (x)) != floorf (x))
+    link_error ();
+  if (ceilf (ceilf (x)) != ceilf (x))
+    link_error ();
+}
+
+void testl(long double x)
+{
+  if (truncl (truncl (x)) != truncl (x))
+    link_error ();
+  if (truncl (floorl (x)) != floorl (x))
+    link_error ();
+  if (truncl (ceill (x)) != ceill (x))
+    link_error ();
+
+  if (floorl (truncl (x)) != truncl (x))
+    link_error ();
+  if (floorl (floorl (x)) != floorl (x))
+    link_error ();
+  if (floorl (ceill (x)) != ceill (x))
+    link_error ();
+
+  if (ceill (truncl (x)) != truncl (x))
+    link_error ();
+  if (ceill (floorl (x)) != floorl (x))
+    link_error ();
+  if (ceill (ceill (x)) != ceill (x))
+    link_error ();
+}
+
+
+int main()
+{
+  test (3.2);
+  testf (3.2f);
+  testl (3.2l);
+  return 0;
+}
+