77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/* Return cosine of complex long 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 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>
|
|
|
|
|
|
__complex__ long double
|
|
__ccosl (__complex__ long double x)
|
|
{
|
|
__complex__ long double res;
|
|
|
|
if (!isfinite (__real__ x) || __isnanl (__imag__ x))
|
|
{
|
|
if (__real__ x == 0.0 || __imag__ x == 0.0)
|
|
{
|
|
__real__ res = __nanl ("");
|
|
__imag__ res = 0.0;
|
|
|
|
#ifdef FE_INVALID
|
|
if (__isinfl (__real__ x))
|
|
feraiseexcept (FE_INVALID);
|
|
#endif
|
|
}
|
|
else if (__isinfl (__imag__ x))
|
|
{
|
|
__real__ res = HUGE_VALL;
|
|
__imag__ res = __nanl ("");
|
|
|
|
#ifdef FE_INVALID
|
|
if (__isinfl (__real__ x))
|
|
feraiseexcept (FE_INVALID);
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
__real__ res = __nanl ("");
|
|
__imag__ res = __nanl ("");
|
|
|
|
#ifdef FE_INVALID
|
|
if (isfinite (__imag__ x))
|
|
feraiseexcept (FE_INVALID);
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
{
|
|
__complex__ long double y;
|
|
|
|
__real__ y = -__imag__ x;
|
|
__imag__ y = __real__ x;
|
|
|
|
res = __ccoshl (y);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
weak_alias (__ccosl, ccosl)
|