mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 09:30:06 +00:00
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/* Complex hyperbole tangent for float.
|
|
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 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 <fenv.h>
|
|
#include <math.h>
|
|
|
|
#include "math_private.h"
|
|
|
|
|
|
__complex__ float
|
|
__ctanhf (__complex__ float x)
|
|
{
|
|
__complex__ float res;
|
|
|
|
if (!isfinite (__real__ x) || !isfinite (__imag__ x))
|
|
{
|
|
if (__isinff (__real__ x))
|
|
{
|
|
__real__ res = __copysignf (1.0, __real__ x);
|
|
__imag__ res = __copysignf (0.0, __imag__ x);
|
|
}
|
|
else if (__imag__ x == 0.0)
|
|
{
|
|
res = x;
|
|
}
|
|
else
|
|
{
|
|
__real__ res = __nanf ("");
|
|
__imag__ res = __nanf ("");
|
|
|
|
#ifdef FE_INVALID
|
|
if (__isinff (__imag__ x))
|
|
feraiseexcept (FE_INVALID);
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
{
|
|
float sin2ix, cos2ix;
|
|
float den;
|
|
|
|
__sincosf (2.0 * __imag__ x, &sin2ix, &cos2ix);
|
|
|
|
den = (__ieee754_coshf (2.0 * __real__ x) + cos2ix);
|
|
|
|
__real__ res = __ieee754_sinhf (2.0 * __real__ x) / den;
|
|
__imag__ res = sin2ix / den;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
#ifndef __ctanhf
|
|
weak_alias (__ctanhf, ctanhf)
|
|
#endif
|