mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
|
/* Compute sine and cosine of argument.
|
||
|
|
Copyright (C) 1997,1999,2004,2006 Free Software Foundation, Inc.
|
||
|
|
This file is part of the GNU C Library.
|
||
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and
|
||
|
|
Jakub Jelinek <jj@ultra.linux.cz>.
|
||
|
|
|
||
|
|
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 <math.h>
|
||
|
|
|
||
|
|
#include "math_private.h"
|
||
|
|
#include <math_ldbl_opt.h>
|
||
|
|
|
||
|
|
void
|
||
|
|
__sincosl (long double x, long double *sinx, long double *cosx)
|
||
|
|
{
|
||
|
|
int64_t ix;
|
||
|
|
|
||
|
|
/* High word of x. */
|
||
|
|
GET_LDOUBLE_MSW64 (ix, x);
|
||
|
|
|
||
|
|
/* |x| ~< pi/4 */
|
||
|
|
ix &= 0x7fffffffffffffffLL;
|
||
|
|
if (ix <= 0x3fe921fb54442d10LL)
|
||
|
|
__kernel_sincosl (x, 0.0L, sinx, cosx, 0);
|
||
|
|
else if (ix >= 0x7ff0000000000000LL)
|
||
|
|
{
|
||
|
|
/* sin(Inf or NaN) is NaN */
|
||
|
|
*sinx = *cosx = x - x;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* Argument reduction needed. */
|
||
|
|
long double y[2];
|
||
|
|
int n;
|
||
|
|
|
||
|
|
n = __ieee754_rem_pio2l (x, y);
|
||
|
|
switch (n & 3)
|
||
|
|
{
|
||
|
|
case 0:
|
||
|
|
__kernel_sincosl (y[0], y[1], sinx, cosx, 1);
|
||
|
|
break;
|
||
|
|
case 1:
|
||
|
|
__kernel_sincosl (y[0], y[1], cosx, sinx, 1);
|
||
|
|
*cosx = -*cosx;
|
||
|
|
break;
|
||
|
|
case 2:
|
||
|
|
__kernel_sincosl (y[0], y[1], sinx, cosx, 1);
|
||
|
|
*sinx = -*sinx;
|
||
|
|
*cosx = -*cosx;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
__kernel_sincosl (y[0], y[1], cosx, sinx, 1);
|
||
|
|
*sinx = -*sinx;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
long_double_symbol (libm, __sincosl, sincosl);
|