mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-31 22:10:34 +03:00
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* Complex hyperbole tangent for double.
|
|
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 <fenv.h>
|
|
#include <math.h>
|
|
|
|
#include "math_private.h"
|
|
|
|
|
|
__complex__ double
|
|
__ctanh (__complex__ double x)
|
|
{
|
|
__complex__ double res;
|
|
|
|
if (!isfinite (__real__ x) || !isfinite (__imag__ x))
|
|
{
|
|
if (__isinf (__real__ x))
|
|
{
|
|
__real__ res = __copysign (1.0, __real__ x);
|
|
__imag__ res = __copysign (0.0, __imag__ x);
|
|
}
|
|
else if (__imag__ x == 0.0)
|
|
{
|
|
res = x;
|
|
}
|
|
else
|
|
{
|
|
__real__ res = __nan ("");
|
|
__imag__ res = __nan ("");
|
|
|
|
#ifdef FE_INVALID
|
|
if (__isinf (__imag__ x))
|
|
feraiseexcept (FE_INVALID);
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
{
|
|
double sin2ix, cos2ix;
|
|
double den;
|
|
|
|
__sincos (2.0 * __imag__ x, &sin2ix, &cos2ix);
|
|
|
|
den = (__ieee754_cosh (2.0 * __real__ x) + cos2ix);
|
|
|
|
__real__ res = __ieee754_sinh (2.0 * __real__ x) / den;
|
|
__imag__ res = sin2ix / den;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
weak_alias (__ctanh, ctanh)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__ctanh, __ctanhl)
|
|
weak_alias (__ctanh, ctanhl)
|
|
#endif
|