From 9d13fb2413921c713f83efe331e8e4d219c62c6b Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Wed, 14 Dec 2005 15:06:39 +0000 Subject: Moved to csu/errno-loc.c. --- math/s_ctanhl.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 math/s_ctanhl.c (limited to 'math/s_ctanhl.c') diff --git a/math/s_ctanhl.c b/math/s_ctanhl.c new file mode 100644 index 0000000..77ca8f8 --- /dev/null +++ b/math/s_ctanhl.c @@ -0,0 +1,80 @@ +/* Complex hyperbole tangent for long double. + Copyright (C) 1997, 2005 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 1997. + + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include +#include +#include + +#include "math_private.h" + + +__complex__ long double +__ctanhl (__complex__ long double x) +{ + __complex__ long double res; + + if (!isfinite (__real__ x) || !isfinite (__imag__ x)) + { + if (__isinfl (__real__ x)) + { + __real__ res = __copysignl (1.0, __real__ x); + __imag__ res = __copysignl (0.0, __imag__ x); + } + else if (__imag__ x == 0.0) + { + res = x; + } + else + { + __real__ res = __nanl (""); + __imag__ res = __nanl (""); + +#ifdef FE_INVALID + if (__isinfl (__imag__ x)) + feraiseexcept (FE_INVALID); +#endif + } + } + else + { + long double sin2ix, cos2ix; + long double den; + + __sincosl (2.0 * __imag__ x, &sin2ix, &cos2ix); + + den = (__ieee754_coshl (2.0 * __real__ x) + cos2ix); + + if (den == 0.0L) + { + __complex__ long double ez = __cexpl (x); + __complex__ long double emz = __cexpl (-x); + + res = (ez - emz) / (ez + emz); + } + else + { + __real__ res = __ieee754_sinhl (2.0 * __real__ x) / den; + __imag__ res = sin2ix / den; + } + } + + return res; +} +weak_alias (__ctanhl, ctanhl) -- cgit v1.1