--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/builtins-43.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,57 @@
+/* { dg-do compile } */
+/* { dg-options "-O1 -fno-trapping-math -fno-finite-math-only -fdump-tree-gimple -fdump-tree-optimized" } */
+  
+extern void f(int);
+extern void link_error ();
+
+extern float x;
+extern double y;
+extern long double z;
+
+int
+main ()
+{
+  double nan = __builtin_nan ("");
+#ifndef __SPU__
+  /* The SPU single-precision floating point format does not support NANs.  */
+  float nanf = __builtin_nanf ("");
+#endif
+  long double nanl = __builtin_nanl ("");
+
+  if (!__builtin_isnan (nan))
+    link_error ();
+#ifndef __SPU__
+  if (!__builtin_isnan (nanf))
+    link_error ();
+  if (!__builtin_isnanf (nanf))
+    link_error ();
+#endif
+  if (!__builtin_isnan (nanl))
+    link_error ();
+  if (!__builtin_isnanl (nanl))
+    link_error ();
+
+  if (__builtin_isnan (4.0))
+    link_error ();
+  if (__builtin_isnan (4.0))
+    link_error ();
+  if (__builtin_isnanf (4.0))
+    link_error ();
+  if (__builtin_isnan (4.0))
+    link_error ();
+  if (__builtin_isnanl (4.0))
+    link_error ();
+
+  f (__builtin_isnan (x));
+  f (__builtin_isnan (y));
+  f (__builtin_isnanf (y));
+  f (__builtin_isnan (z));
+  f (__builtin_isnanl (z));
+}
+
+
+/* Check that all instances of __builtin_isnan were folded.  */
+/* { dg-final { scan-tree-dump-times "isnan" 0 "gimple" } } */
+
+/* Check that all instances of link_error were subject to DCE.  */
+/* { dg-final { scan-tree-dump-times "link_error" 0 "optimized" } } */