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-rw-r--r--lib/msun/src/s_finite.c41
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diff --git a/lib/msun/src/s_finite.c b/lib/msun/src/s_finite.c
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+/* @(#)s_finite.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_finite.c,v 1.1.1.1 1994/05/06 00:20:04 gclarkii Exp $";
+#endif
+
+/*
+ * finite(x) returns 1 is x is finite, else 0;
+ * no branching!
+ */
+
+#include "math.h"
+#include <machine/endian.h>
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define n0 1
+#else
+#define n0 0
+#endif
+
+#ifdef __STDC__
+ int finite(double x)
+#else
+ int finite(x)
+ double x;
+#endif
+{
+ int hx;
+ hx = *(n0+(int*)&x);
+ return (unsigned)((hx&0x7fffffff)-0x7ff00000)>>31;
+}