mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/* Complex cosine hyperbole function for double.
|
|
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__ double
|
|
__ccosh (__complex__ double x)
|
|
{
|
|
__complex__ double retval;
|
|
int rcls = fpclassify (__real__ x);
|
|
int icls = fpclassify (__imag__ x);
|
|
|
|
if (rcls >= FP_ZERO)
|
|
{
|
|
/* Real part is finite. */
|
|
if (icls >= FP_ZERO)
|
|
{
|
|
/* Imaginary part is finite. */
|
|
double sinh_val = __ieee754_sinh (__real__ x);
|
|
double cosh_val = __ieee754_cosh (__real__ x);
|
|
double sinix, cosix;
|
|
|
|
__sincos (__imag__ x, &sinix, &cosix);
|
|
|
|
__real__ retval = cosh_val * cosix;
|
|
__imag__ retval = sinh_val * sinix;
|
|
}
|
|
else
|
|
{
|
|
__imag__ retval = __real__ x == 0.0 ? 0.0 : __nan ("");
|
|
__real__ retval = __nan ("") + __nan ("");
|
|
|
|
#ifdef FE_INVALID
|
|
if (icls == FP_INFINITE)
|
|
feraiseexcept (FE_INVALID);
|
|
#endif
|
|
}
|
|
}
|
|
else if (rcls == FP_INFINITE)
|
|
{
|
|
/* Real part is infinite. */
|
|
if (icls == FP_ZERO)
|
|
{
|
|
/* Imaginary part is 0.0. */
|
|
__real__ retval = HUGE_VAL;
|
|
__imag__ retval = __imag__ x * __copysign (1.0, __real__ x);
|
|
}
|
|
else if (icls > FP_ZERO)
|
|
{
|
|
/* Imaginary part is finite. */
|
|
double sinix, cosix;
|
|
|
|
__sincos (__imag__ x, &sinix, &cosix);
|
|
|
|
__real__ retval = __copysign (HUGE_VAL, cosix);
|
|
__imag__ retval = (__copysign (HUGE_VAL, sinix)
|
|
* __copysign (1.0, __real__ x));
|
|
}
|
|
else
|
|
{
|
|
/* The addition raises the invalid exception. */
|
|
__real__ retval = HUGE_VAL;
|
|
__imag__ retval = __nan ("") + __nan ("");
|
|
|
|
#ifdef FE_INVALID
|
|
if (icls == FP_INFINITE)
|
|
feraiseexcept (FE_INVALID);
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
{
|
|
__real__ retval = __nan ("");
|
|
__imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nan ("");
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
weak_alias (__ccosh, ccosh)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__ccosh, __ccoshl)
|
|
weak_alias (__ccosh, ccoshl)
|
|
#endif
|