From 1077fa4d772832f77a677ce7fb7c2d513b959e3f Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Thu, 10 May 2001 00:40:28 +0000
Subject: uClibc now has a math library.  muahahahaha!  -Erik

---
 libm/ldouble/isnanl.c | 186 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 libm/ldouble/isnanl.c

(limited to 'libm/ldouble/isnanl.c')

diff --git a/libm/ldouble/isnanl.c b/libm/ldouble/isnanl.c
new file mode 100644
index 000000000..44158ecc7
--- /dev/null
+++ b/libm/ldouble/isnanl.c
@@ -0,0 +1,186 @@
+/*							isnanl()
+ *							isfinitel()
+ *							signbitl()
+ *
+ *	Floating point IEEE special number tests
+ *
+ *
+ *
+ * SYNOPSIS:
+ *
+ * int signbitl(), isnanl(), isfinitel();
+ * long double x, y;
+ *
+ * n = signbitl(x);
+ * n = isnanl(x);
+ * n = isfinitel(x);
+ *
+ *
+ *
+ * DESCRIPTION:
+ *
+ * These functions are part of the standard C run time library
+ * for some but not all C compilers.  The ones supplied are
+ * written in C for IEEE arithmetic.  They should
+ * be used only if your compiler library does not already have
+ * them.
+ *
+ */
+
+
+/*
+Cephes Math Library Release 2.7:  June, 1998
+Copyright 1992, 1998 by Stephen L. Moshier
+*/
+
+
+#include <math.h>
+
+/* This is defined in mconf.h. */
+/* #define DENORMAL 1 */
+
+#ifdef UNK
+/* Change UNK into something else.  */
+#undef UNK
+#if BIGENDIAN
+#define MIEEE 1
+#else
+#define IBMPC 1
+#endif
+#endif
+
+
+/* Return 1 if the sign bit of x is 1, else 0.  */
+
+int signbitl(x)
+long double x;
+{
+union
+	{
+	long double d;
+	short s[6];
+	int i[3];
+	} u;
+
+u.d = x;
+
+if( sizeof(int) == 4 )
+	{
+#ifdef IBMPC
+	return( u.s[4] < 0 );
+#endif
+#ifdef MIEEE
+	return( u.i[0] < 0 );
+#endif
+	}
+else
+	{
+#ifdef IBMPC
+	return( u.s[4] < 0 );
+#endif
+#ifdef MIEEE
+	return( u.s[0] < 0 );
+#endif
+	}
+}
+
+
+/* Return 1 if x is a number that is Not a Number, else return 0.  */
+
+int isnanl(x)
+long double x;
+{
+#ifdef NANS
+union
+	{
+	long double d;
+	unsigned short s[6];
+	unsigned int i[3];
+	} u;
+
+u.d = x;
+
+if( sizeof(int) == 4 )
+	{
+#ifdef IBMPC
+	if( ((u.s[4] & 0x7fff) == 0x7fff)
+	    && (((u.i[1] & 0x7fffffff)!= 0) || (u.i[0] != 0)))
+		return 1;
+#endif
+#ifdef MIEEE
+	if( ((u.i[0] & 0x7fff0000) == 0x7fff0000)
+	    && (((u.i[1] & 0x7fffffff) != 0) || (u.i[2] != 0)))
+		return 1;
+#endif
+	return(0);
+	}
+else
+	{ /* size int not 4 */
+#ifdef IBMPC
+	if( (u.s[4] & 0x7fff) == 0x7fff)
+		{
+		if((u.s[3] & 0x7fff) | u.s[2] | u.s[1] | u.s[0])
+			return(1);
+		}
+#endif
+#ifdef MIEEE
+	if( (u.s[0] & 0x7fff) == 0x7fff)
+		{
+		if((u.s[2] & 0x7fff) | u.s[3] | u.s[4] | u.s[5])
+			return(1);
+		}
+#endif
+	return(0);
+	} /* size int not 4 */
+
+#else
+/* No NANS.  */
+return(0);
+#endif
+}
+
+
+/* Return 1 if x is not infinite and is not a NaN.  */
+
+int isfinitel(x)
+long double x;
+{
+#ifdef INFINITIES
+union
+	{
+	long double d;
+	unsigned short s[6];
+	unsigned int i[3];
+	} u;
+
+u.d = x;
+
+if( sizeof(int) == 4 )
+	{
+#ifdef IBMPC
+	if( (u.s[4] & 0x7fff) != 0x7fff)
+		return 1;
+#endif
+#ifdef MIEEE
+	if( (u.i[0] & 0x7fff0000) != 0x7fff0000)
+		return 1;
+#endif
+	return(0);
+	}
+else
+	{
+#ifdef IBMPC
+	if( (u.s[4] & 0x7fff) != 0x7fff)
+		return 1;
+#endif
+#ifdef MIEEE
+	if( (u.s[0] & 0x7fff) != 0x7fff)
+		return 1;
+#endif
+	return(0);
+	}
+#else
+/* No INFINITY.  */
+return(1);
+#endif
+}
-- 
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