glibc/sysdeps/libm-ieee754/e_atanhl.c

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update from main archive 960829 Fri Aug 30 01:26:44 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/i386/Dist: Add close.S. * sysdeps/unix/sysv/linux/m68k/Dist: Likewise. * sysdeps/unix/sysv/linux/alpha/Dist: Likewise. * version.c: Add comment about where to report bugs to. * catgets/gencat.c (usage): Likewise. * db/makedb.c (usage): Likewise. * locale/programs/locale.c (usage): Likewise. * locale/programs/localedef.c (usage): Likewise. * manual/socket.texi: A little bit better wording. Thu Aug 29 18:03:06 1996 Ulrich Drepper <drepper@cygnus.com> * Makerules: Make sure directory exists before generating stamp file. (BUILD_CFLAGS): Always refer to using $(..). * manual/Makefile: Make sure directory exists before generating stamp file. (make-target-directory): Add macro definition. * sysdeps/generic/Makefile: Make sure directory exists before generating stamp file. * Makefile (distribute): Add autolock.sh. Reported by Fila Kolodny. Tue Aug 27 10:06:22 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> When compiling in separate directory put objects into subdirectories matching the source layout. * Makeconfig (objpfx) [ifdef objdir]: Append $(subdir). When looking for configparms try in $(common-objpfx). Use $(common-objpfx)SUBDIR to find objects from other subdirectory builds. * Makerules: Add $(objpfx) to vpath list. (make-dummy-dep): Use $(common-objpfx) to avoid creating dummy.d more than once. All uses in dependency lists changed. (+make-deps): Make target directory. (sed-remove-objpfx): Substitute $(common-objpfx). (do-ar, build-extra-lib, $(common-objpfx)stub-$(subdir)): Use $(objpfx) instead of $(objdir) for cd command. (O%-lib): Always find libc relative to $(..). (subdir-stamps): Collect stamp files from subdirs. (common-mostlyclean): Remove stub file in $(common-objpfx). * MakeTAGS ($P/siglist.pot): Find siglist.c in stdio-common. * Rules (dep-dummy-lib): Use $(common-objpfx) to avoid creating to more than once. ($(objpfx)dummy.c, $(objpfx)empty.c): Change target name to use $(common-objfpx). All uses in dependency lists changed. (generated): Prepend $(..) to names. * bare/Makefile ($(objpfx)lib$(config-vendor).a): Remove $(objpfx) from $@. * nss/Makefile ($(objpfx)libnss_dns.so, $(objpfx)libnss_db.so): Use $(common-objpfx) instead of $(..) in dependencies. * sysdeps/mach/Makefile (mach-objpfx): Unconditionally use $(common-objpfx) instead of $(..) and (objpfx). * sysdeps/mach/hurd/Makefile (hurd-objpfx): Likewise. (rpath-link): Likewise. (rpcuserlibs): Likewise. * sysdeps/unix/Makefile [$(subdir) = stdio-common]: Check for errlist.c in $(objpfx), not $(common-objpfx). ($(common-objpfx)s-proto.d): Special rule not covered by pattern rule. * sysdeps/unix/make-syscalls.sh: Make syscall rules depending on s-proto.d in $(common-objpfx), not $(objpfx). Thu Aug 29 17:45:49 1996 Ulrich Drepper <drepper@cygnus.com> * nss/nsswitch.c (nss_dlerror_run): Free returned error string. Thu Aug 29 15:53:33 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/libm-ieee754/e_acoshl.c: New file. `long double' implementation. * sysdeps/libm-ieee754/e_atanhl.c: Likewise. * sysdeps/libm-ieee754/e_remainderl.c: Likewise. * sysdeps/libm-ieee754/e_scalbl.c: Likewise. * sysdeps/libm-ieee754/s_asinhl.c: Likewise. * sysdeps/libm-ieee754/s_cosl.c: Likewise. * sysdeps/libm-ieee754/s_sinl.c: Likewise. * sysdeps/libm-ieee754/s_tanhl.c: Likewise. * sysdeps/libm-ieee754/s_tanl.c: Likewise. * stdio-common/printf_fp.c (__printf_fp): Use default value '.' if
1996-08-30 00:58:28 +00:00
/* s_atanhl.c -- long double version of s_atan.c.
* Conversion to long double by Ulrich Drepper,
* Cygnus Support, drepper@cygnus.com.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: $";
#endif
/* __ieee754_atanhl(x)
* Method :
* 1.Reduced x to positive by atanh(-x) = -atanh(x)
* 2.For x>=0.5
* 1 2x x
* atanhl(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------)
* 2 1 - x 1 - x
*
* For x<0.5
* atanhl(x) = 0.5*log1pl(2x+2x*x/(1-x))
*
* Special cases:
* atanhl(x) is NaN if |x| > 1 with signal;
* atanhl(NaN) is that NaN with no signal;
* atanhl(+-1) is +-INF with signal.
*
*/
#include "math.h"
#include "math_private.h"
#ifdef __STDC__
static const long double one = 1.0, huge = 1e16380;
#else
static long double one = 1.0, huge = 1e16380;
#endif
#ifdef __STDC__
static const long double zero = 0.0;
#else
static double long zero = 0.0;
#endif
#ifdef __STDC__
long double __ieee754_atanhl(long double x)
#else
long double __ieee754_atanhl(x)
long double x;
#endif
{
long double t;
int32_t ix;
u_int32_t se,i0,i1;
EXTRACT_LDOUBLE_WORDS(se,i0,i1,x);
ix = se&0x7fff;
if ((ix+((((i0&0x7fffffff)|i1)|(-((i0&0x7fffffff)|i1)))>>31))>0x3fff)
/* |x|>1 */
return (x-x)/(x-x);
if(ix==0x3fff)
return x/zero;
if(ix<0x3fe3&&(huge+x)>zero) return x; /* x<2**-28 */
SET_LDOUBLE_EXP(x,ix);
if(ix<0x3ffe) { /* x < 0.5 */
t = x+x;
t = 0.5*__log1pl(t+t*x/(one-x));
} else
t = 0.5*__log1pl((x+x)/(one-x));
if(se>0x7fff) return t; else return -t;
}