85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
|
/* Return arc hyperbole sine for double value.
|
||
|
|
Copyright (C) 1997 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 Library General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2 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
|
||
|
|
Library General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Library General Public
|
||
|
|
License along with the GNU C Library; see the file COPYING.LIB. 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>
|
||
|
|
|
||
|
|
|
||
|
|
__complex__ double
|
||
|
|
__casinh (__complex__ double x)
|
||
|
|
{
|
||
|
|
__complex__ 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 = __copysign (HUGE_VAL, __real__ x);
|
||
|
|
|
||
|
|
if (rcls == FP_NAN)
|
||
|
|
__imag__ res = __nan ("");
|
||
|
|
else
|
||
|
|
__imag__ res = __copysign (rcls >= FP_ZERO ? M_PI_2 : M_PI_4,
|
||
|
|
__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 = __copysign (0.0, __imag__ x);
|
||
|
|
else
|
||
|
|
__imag__ res = __nan ("");
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
__real__ res = __nan ("");
|
||
|
|
__imag__ res = __nan ("");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else if (rcls == FP_ZERO && icls == FP_ZERO)
|
||
|
|
{
|
||
|
|
res = x;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
__complex__ double y;
|
||
|
|
|
||
|
|
__real__ y = (__real__ x - __imag__ x) * (__real__ x + __imag__ x) + 1.0;
|
||
|
|
__imag__ y = 2.0 * __real__ x * __imag__ x;
|
||
|
|
|
||
|
|
y = __csqrt (y);
|
||
|
|
|
||
|
|
__real__ y += __real__ x;
|
||
|
|
__imag__ y += __imag__ x;
|
||
|
|
|
||
|
|
res = __clog (y);
|
||
|
|
}
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
weak_alias (__casinh, casinh)
|
||
|
|
#ifdef NO_LONG_DOUBLE
|
||
|
|
strong_alias (__casinh, __casinhl)
|
||
|
|
weak_alias (__casinh, casinhl)
|
||
|
|
#endif
|