/* Return arc hyperbole sine for long double value.
Copyright (C) 1997, 1998, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 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 <complex.h>
#include <math.h>
#include <math_private.h>
__complex__ long double
__casinhl (__complex__ long double x)
{
__complex__ long double res;
int rcls = fpclassify (__real__ x);
int icls = fpclassify (__imag__ x);
if (rcls <= FP_INFINITE || icls <= FP_INFINITE)
if (icls == FP_INFINITE)
__real__ res = __copysignl (HUGE_VALL, __real__ x);
if (rcls == FP_NAN)
__imag__ res = __nanl ("");
else
__imag__ res = __copysignl (rcls >= FP_ZERO ? M_PI_2l : M_PI_4l,
__imag__ x);
}
else if (rcls <= FP_INFINITE)
__real__ res = __real__ x;
if ((rcls == FP_INFINITE && icls >= FP_ZERO)
|| (rcls == FP_NAN && icls == FP_ZERO))
__imag__ res = __copysignl (0.0, __imag__ x);
__real__ res = __nanl ("");
else if (rcls == FP_ZERO && icls == FP_ZERO)
res = x;
__complex__ long double y;
__real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) + 1.0;
__imag__ y = 2.0 * __real__ x * __imag__ x;
y = __csqrtl (y);
__real__ y += __real__ x;
__imag__ y += __imag__ x;
res = __clogl (y);
return res;
weak_alias (__casinhl, casinhl)