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/* Compute projection of complex long double value to Riemann sphere.
Copyright (C) 1997,1999,2006 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 <math.h>
#include <math_ldbl_opt.h>
__complex__ long double
__cprojl (__complex__ long double x)
{
__complex__ long double res;
if (isnan (__real__ x) && isnan (__imag__ x))
return x;
else if (!isfinite (__real__ x) || !isfinite (__imag__ x))
{
__real__ res = INFINITY;
__imag__ res = __copysignl (0.0, __imag__ x);
}
else
{
long double den = (__real__ x * __real__ x + __imag__ x * __imag__ x
+ 1.0);
__real__ res = (2.0 * __real__ x) / den;
__imag__ res = (2.0 * __imag__ x) / den;
/* __gcc_qmul does not respect -0.0 so we need the following fixup. */
if (__real__ x == 0.0)
__real__ res = __real__ x;
if (__imag__ x == 0.0)
__imag__ res = __imag__ x;
}
return res;
}
long_double_symbol (libm, __cprojl, cprojl);
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