glibc/sysdeps/ieee754/ldbl-128/s_sincosl.c
Andreas Jaeger 41bdb6e20c Update to LGPL v2.1.
2001-07-06  Paul Eggert  <eggert@twinsun.com>

	* manual/argp.texi: Remove ignored LGPL copyright notice; it's
	not appropriate for documentation anyway.
	* manual/libc-texinfo.sh: "Library General Public License" ->
	"Lesser General Public License".

2001-07-06  Andreas Jaeger  <aj@suse.de>

	* All files under GPL/LGPL version 2: Place under LGPL version
	2.1.
2001-07-06 04:58:11 +00:00

72 lines
1.9 KiB
C

/* Compute sine and cosine of argument.
Copyright (C) 1997, 1999 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"
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 <= 0x3ffe921fb54442d1LL)
__kernel_sincosl (x, 0.0L, sinx, cosx, 0);
else if (ix >= 0x7fff000000000000LL)
{
/* 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;
}
}
}
weak_alias (__sincosl, sincosl)