diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/e_atanh.c')
-rw-r--r-- | sysdeps/ieee754/dbl-64/e_atanh.c | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_atanh.c b/sysdeps/ieee754/dbl-64/e_atanh.c deleted file mode 100644 index a9d19a0472..0000000000 --- a/sysdeps/ieee754/dbl-64/e_atanh.c +++ /dev/null @@ -1,74 +0,0 @@ -/* Copyright (C) 2011-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Ulrich Drepper <drepper@gmail.com>, 2011. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - - -/* __ieee754_atanh(x) - Method : - 1.Reduced x to positive by atanh(-x) = -atanh(x) - 2.For x>=0.5 - 1 2x x - atanh(x) = --- * log(1 + -------) = 0.5 * log1p(2 * --------) - 2 1 - x 1 - x - - For x<0.5 - atanh(x) = 0.5*log1p(2x+2x*x/(1-x)) - - Special cases: - atanh(x) is NaN if |x| > 1 with signal; - atanh(NaN) is that NaN with no signal; - atanh(+-1) is +-INF with signal. - - */ - -#include <float.h> -#include <inttypes.h> -#include <math.h> -#include <math_private.h> - -static const double huge = 1e300; - -double -__ieee754_atanh (double x) -{ - double xa = fabs (x); - double t; - if (isless (xa, 0.5)) - { - if (__glibc_unlikely (xa < 0x1.0p-28)) - { - math_force_eval (huge + x); - math_check_force_underflow (x); - return x; - } - - t = xa + xa; - t = 0.5 * __log1p (t + t * xa / (1.0 - xa)); - } - else if (__glibc_likely (isless (xa, 1.0))) - t = 0.5 * __log1p ((xa + xa) / (1.0 - xa)); - else - { - if (isgreater (xa, 1.0)) - return (x - x) / (x - x); - - return x / 0.0; - } - - return __copysign (t, x); -} -strong_alias (__ieee754_atanh, __atanh_finite) |