1 files changed, 38 insertions, 0 deletions
diff --git a/lib/msun/src/s_isnan.c b/lib/msun/src/s_isnan.c
new file mode 100644
index 0000000..3f18f7d
--- /dev/null
+++ b/lib/msun/src/s_isnan.c
@@ -0,0 +1,38 @@
+/* @(#)s_isnan.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice 
+ * is preserved.
+ * ====================================================
+ */
+
+#ifndef lint
+static char rcsid[] = "$Id: s_isnan.c,v 1.6 1994/08/18 23:06:54 jtc Exp $";
+#endif
+
+/*
+ * isnan(x) returns 1 is x is nan, else 0;
+ * no branching!
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+#ifdef __STDC__
+	int isnan(double x)
+#else
+	int isnan(x)
+	double x;
+#endif
+{
+	int32_t hx,lx;
+	EXTRACT_WORDS(hx,lx,x);
+	hx &= 0x7fffffff;
+	hx |= (u_int32_t)(lx|(-lx))>>31;	
+	hx = 0x7ff00000 - hx;
+	return (int)((u_int32_t)(hx))>>31;
+}