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/* Return cosine of a complex type.
Copyright (C) 1997-2021 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, see
<https://www.gnu.org/licenses/>. */
#include <complex.h>
#include <math.h>
CFLOAT
M_DECL_FUNC (__cacos) (CFLOAT x)
{
CFLOAT y;
CFLOAT res;
int rcls = fpclassify (__real__ x);
int icls = fpclassify (__imag__ x);
if (rcls <= FP_INFINITE || icls <= FP_INFINITE
|| (rcls == FP_ZERO && icls == FP_ZERO))
{
y = M_SUF (__casin) (x);
__real__ res = (FLOAT) M_MLIT (M_PI_2) - __real__ y;
if (__real__ res == 0)
__real__ res = 0;
__imag__ res = -__imag__ y;
}
else
{
__real__ y = -__imag__ x;
__imag__ y = __real__ x;
y = M_SUF (__kernel_casinh) (y, 1);
__real__ res = __imag__ y;
__imag__ res = __real__ y;
}
return res;
}
declare_mgen_alias (__cacos, cacos);
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