6952e59e25
1997-02-04 02:08 Ulrich Drepper <drepper@cygnus.com> * Version 2.0.1 net release. 1997-02-03 23:34 Stephen L Moshier <moshier@world.std.com> * sysdeps/libm-ieee754/s_tanhl.c: Fix backwards result sign. 1997-02-03 19:59 Ulrich Drepper <drepper@cygnus.com> * stdlib/getsubopt.c: Don't return `=' for suboption which has a parameter. Reported by Gary L. Hennigan <glhenni@cs.sandia.gov>. 1997-02-03 18:20 Thorsten Kukuk <kukuk@weber.uni-paderborn.de> * nis/rpcsvc/yp_proh.h (ypresp_key_val): Also change order of values as in yp.x and yp.h. 1997-02-03 16:58 Ulrich Drepper <drepper@cygnus.com> * nis/rpcsvc/yp.x (struct ypresp_key_val): Revert patch from 1997-02-03 02:17. Sun's implementation internally corrects this bug but we don't want to hide this from the user. * nis/rpcsvc/yp.h: Likewise. 1997-02-01 18:28 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/unix/sysv/linux/net/ppp_defs.h: Protect against multiple inclusion. 1997-02-02 14:56 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * manual/nss.texi, manual/pattern.texi, manual/string.texi: Doc fixes. 1997-02-02 11:51 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * MakeTAGS (sysdep-sources, sysdep-headers): New variables. (all-sources, all-headers): Use them instead of $(sources) and $(headers) when searching in sysdep directories. 1997-02-02 11:49 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * Makerules (REAL_MAKE_VERSION): Use internal make function instead of shelling out. 1997-02-02 11:47 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * time/Makefile (install-test-data): Remove mkdir command, zic can handle that gracefully. 1997-02-03 14:07 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/m68k/asm-syntax.h: Add back file which got lost sometime somehow. 1997-02-02 07:46 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sunrpc/Makefile: Check $(cross-compiling) only after including ../Makeconfig. ($(objpfx)rpcsvc/%.h, $(objpfx)x%.c): Add empty command to force being considered as a rule. (generated): Add stamp files before the inclusion of Makerules to magically mark them as not being intermediate via the `generated' target.
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/* s_tanhl.c -- long double version of s_tanh.c.
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* Conversion to long double by Ulrich Drepper,
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* Cygnus Support, drepper@cygnus.com.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#if defined(LIBM_SCCS) && !defined(lint)
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static char rcsid[] = "$NetBSD: $";
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#endif
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/* tanhl(x)
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* Return the Hyperbolic Tangent of x
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*
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* Method :
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* x -x
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* e - e
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* 0. tanhl(x) is defined to be -----------
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* x -x
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* e + e
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* 1. reduce x to non-negative by tanhl(-x) = -tanhl(x).
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* 2. 0 <= x <= 2**-55 : tanhl(x) := x*(one+x)
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* -t
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* 2**-55 < x <= 1 : tanhl(x) := -----; t = expm1l(-2x)
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* t + 2
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* 2
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* 1 <= x <= 23.0 : tanhl(x) := 1- ----- ; t=expm1l(2x)
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* t + 2
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* 23.0 < x <= INF : tanhl(x) := 1.
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*
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* Special cases:
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* tanhl(NaN) is NaN;
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* only tanhl(0)=0 is exact for finite argument.
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*/
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#include "math.h"
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#include "math_private.h"
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#ifdef __STDC__
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static const long double one=1.0, two=2.0, tiny = 1.0e-4900L;
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#else
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static long double one=1.0, two=2.0, tiny = 1.0e-4900L;
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#endif
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#ifdef __STDC__
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long double __tanhl(long double x)
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#else
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long double __tanhl(x)
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long double x;
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#endif
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{
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long double t,z;
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int32_t se;
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u_int32_t j0,j1,ix;
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/* High word of |x|. */
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GET_LDOUBLE_WORDS(se,j0,j1,x);
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ix = se&0x7fff;
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/* x is INF or NaN */
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if(ix==0x7fff) {
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if (se>=0x7fff) return one/x+one; /* tanhl(+-inf)=+-1 */
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else return one/x-one; /* tanhl(NaN) = NaN */
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}
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/* |x| < 23 */
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if (ix < 0x4003 || (ix == 0x4003 && j0 < 0xb8000000u)) {/* |x|<23 */
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if (ix<0x3fc8) /* |x|<2**-55 */
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return x*(one+x); /* tanh(small) = small */
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if (ix>=0x3fff) { /* |x|>=1 */
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t = __expm1l(two*fabsl(x));
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z = one - two/(t+two);
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} else {
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t = __expm1l(-two*fabsl(x));
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z= -t/(t+two);
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}
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/* |x| > 23, return +-1 */
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} else {
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z = one - tiny; /* raised inexact flag */
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}
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return (se>0x7fff)? -z: z;
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}
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weak_alias (__tanhl, tanhl)
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