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author | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
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committer | Zack Weinberg <zackw@panix.com> | 2017-06-08 15:39:03 -0400 |
commit | 5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch) | |
tree | 4470480d904b65cf14ca524f96f79eca818c3eaf /sysdeps/ieee754/dbl-64/s_tanh.c | |
parent | 199fc19d3aaaf57944ef036e15904febe877fc93 (diff) | |
download | glibc-zack/build-layout-experiment.tar glibc-zack/build-layout-experiment.tar.gz glibc-zack/build-layout-experiment.tar.bz2 glibc-zack/build-layout-experiment.zip |
Prepare for radical source tree reorganization.zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_tanh.c')
-rw-r--r-- | sysdeps/ieee754/dbl-64/s_tanh.c | 98 |
1 files changed, 0 insertions, 98 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_tanh.c b/sysdeps/ieee754/dbl-64/s_tanh.c deleted file mode 100644 index 344a2f0330..0000000000 --- a/sysdeps/ieee754/dbl-64/s_tanh.c +++ /dev/null @@ -1,98 +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 <float.h> -#include <math.h> -#include <math_private.h> - -static const double one = 1.0, two = 2.0, tiny = 1.0e-300; - -double -__tanh (double x) -{ - 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 */ - { - math_check_force_underflow (x); - 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 |