--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/support/fdlibm/s_isnan.c	Sat Feb 16 19:08:45 2013 +0100
@@ -0,0 +1,34 @@
+
+/* @(#)s_isnan.c 1.3 95/01/18 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunSoft, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice 
+ * is preserved.
+ * ====================================================
+ */
+
+/*
+ * isnan(x) returns 1 is x is nan, else 0;
+ * no branching!
+ */
+
+#include "fdlibm.h"
+
+#ifdef __STDC__
+	int isnan(double x)
+#else
+	int isnan(x)
+	double x;
+#endif
+{
+	int hx,lx;
+	hx = (__HI(x)&0x7fffffff);
+	lx = __LO(x);
+	hx |= (unsigned)(lx|(-lx))>>31;	
+	hx = 0x7ff00000 - hx;
+	return ((unsigned)(hx))>>31;
+}