b2dad0e372
2000-04-21 Benjamin Kosnik <bkoz@redhat.com> * libstdc++-v3: New directory. From-SVN: r33317
111 lines
3.2 KiB
C
111 lines
3.2 KiB
C
/* Return value of complex exp function for long double complex value. */
|
|
|
|
/* Copyright (C) 1997-1999 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU ISO C++ Library. This library is free
|
|
software; you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the
|
|
Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
This 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along
|
|
with this library; see the file COPYING. If not, write to the Free
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
|
|
USA.
|
|
|
|
As a special exception, you may use this file as part of a free software
|
|
library without restriction. Specifically, if other files instantiate
|
|
templates or use macros or inline functions from this file, or you compile
|
|
this file and link it with other files to produce an executable, this
|
|
file does not by itself cause the resulting executable to be covered by
|
|
the GNU General Public License. This exception does not however
|
|
invalidate any other reasons why the executable file might be covered by
|
|
the GNU General Public License. */
|
|
|
|
#include <math.h>
|
|
#include "mathconf.h"
|
|
|
|
|
|
__complex__ long double
|
|
cexpl (__complex__ long double x)
|
|
{
|
|
__complex__ long double retval;
|
|
|
|
if (FINITEL_P (__real__ x))
|
|
{
|
|
/* Real part is finite. */
|
|
if (FINITEL_P (__imag__ x))
|
|
{
|
|
/* Imaginary part is finite. */
|
|
long double exp_val = expl (__real__ x);
|
|
long double sinix = sinl (__imag__ x);
|
|
long double cosix = cosl (__imag__ x);
|
|
|
|
if (FINITEL_P (exp_val))
|
|
{
|
|
__real__ retval = exp_val * cosix;
|
|
__imag__ retval = exp_val * sinix;
|
|
}
|
|
else
|
|
{
|
|
__real__ retval = copysignl (exp_val, cosix);
|
|
__imag__ retval = copysignl (exp_val, sinix);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* If the imaginary part is +-inf or NaN and the real part
|
|
is not +-inf the result is NaN + iNaN. */
|
|
__real__ retval = NAN;
|
|
__imag__ retval = NAN;
|
|
}
|
|
}
|
|
else if (INFINITEL_P (__real__ x))
|
|
{
|
|
/* Real part is infinite. */
|
|
if (FINITEL_P (__imag__ x))
|
|
{
|
|
/* Imaginary part is finite. */
|
|
long double value = signbit (__real__ x) ? 0.0 : HUGE_VALL;
|
|
|
|
if (__imag__ x == 0.0)
|
|
{
|
|
/* Imaginary part is 0.0. */
|
|
__real__ retval = value;
|
|
__imag__ retval = __imag__ x;
|
|
}
|
|
else
|
|
{
|
|
long double sinix = sinl (__imag__ x);
|
|
long double cosix = cosl (__imag__ x);
|
|
|
|
__real__ retval = copysignl (value, cosix);
|
|
__imag__ retval = copysignl (value, sinix);
|
|
}
|
|
}
|
|
else if (signbit (__real__ x) == 0)
|
|
{
|
|
__real__ retval = HUGE_VALL;
|
|
__imag__ retval = NAN;
|
|
}
|
|
else
|
|
{
|
|
__real__ retval = 0.0;
|
|
__imag__ retval = copysignl (0.0, __imag__ x);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* If the real part is NaN the result is NaN + iNaN. */
|
|
__real__ retval = NAN;
|
|
__imag__ retval = NAN;
|
|
}
|
|
|
|
return retval;
|
|
}
|