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authorUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
committerUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
commitabfbdde177c3a7155070dda1b2cdc8292054cc26 (patch)
treee021306b596381fbf8311d2b7eb294e918ff17c8 /sysdeps/libm-ieee754/s_tanh.c
parent86421aa57ecfd70963ae66848bd6a6dd3b8e0fe6 (diff)
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Update.
Diffstat (limited to 'sysdeps/libm-ieee754/s_tanh.c')
-rw-r--r--sysdeps/libm-ieee754/s_tanh.c93
1 files changed, 0 insertions, 93 deletions
diff --git a/sysdeps/libm-ieee754/s_tanh.c b/sysdeps/libm-ieee754/s_tanh.c
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--- a/sysdeps/libm-ieee754/s_tanh.c
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@@ -1,93 +0,0 @@
-/* @(#)s_tanh.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.
- * ====================================================
- */
-
-#if defined(LIBM_SCCS) && !defined(lint)
-static char rcsid[] = "$NetBSD: s_tanh.c,v 1.7 1995/05/10 20:48:22 jtc Exp $";
-#endif
-
-/* Tanh(x)
- * Return the Hyperbolic Tangent of x
- *
- * Method :
- * x -x
- * e - e
- * 0. tanh(x) is defined to be -----------
- * x -x
- * e + e
- * 1. reduce x to non-negative by tanh(-x) = -tanh(x).
- * 2. 0 <= x <= 2**-55 : tanh(x) := x*(one+x)
- * -t
- * 2**-55 < x <= 1 : tanh(x) := -----; t = expm1(-2x)
- * t + 2
- * 2
- * 1 <= x <= 22.0 : tanh(x) := 1- ----- ; t=expm1(2x)
- * t + 2
- * 22.0 < x <= INF : tanh(x) := 1.
- *
- * Special cases:
- * tanh(NaN) is NaN;
- * only tanh(0)=0 is exact for finite argument.
- */
-
-#include "math.h"
-#include "math_private.h"
-
-#ifdef __STDC__
-static const double one=1.0, two=2.0, tiny = 1.0e-300;
-#else
-static double one=1.0, two=2.0, tiny = 1.0e-300;
-#endif
-
-#ifdef __STDC__
- double __tanh(double x)
-#else
- double __tanh(x)
- double x;
-#endif
-{
- double t,z;
- int32_t jx,ix,lx;
-
- /* High word of |x|. */
- EXTRACT_WORDS(jx,lx,x);
- ix = jx&0x7fffffff;
-
- /* x is INF or NaN */
- if(ix>=0x7ff00000) {
- if (jx>=0) return one/x+one; /* tanh(+-inf)=+-1 */
- else return one/x-one; /* tanh(NaN) = NaN */
- }
-
- /* |x| < 22 */
- if (ix < 0x40360000) { /* |x|<22 */
- if ((ix | lx) == 0)
- return x; /* x == +-0 */
- if (ix<0x3c800000) /* |x|<2**-55 */
- return x*(one+x); /* tanh(small) = small */
- if (ix>=0x3ff00000) { /* |x|>=1 */
- t = __expm1(two*fabs(x));
- z = one - two/(t+two);
- } else {
- t = __expm1(-two*fabs(x));
- z= -t/(t+two);
- }
- /* |x| > 22, return +-1 */
- } else {
- z = one - tiny; /* raised inexact flag */
- }
- return (jx>=0)? z: -z;
-}
-weak_alias (__tanh, tanh)
-#ifdef NO_LONG_DOUBLE
-strong_alias (__tanh, __tanhl)
-weak_alias (__tanh, tanhl)
-#endif