glibc/sysdeps/ieee754/ldbl-96/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

75 lines
2.0 KiB
C

/* Compute sine and cosine of argument.
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 <math.h>
#include "math_private.h"
void
__sincosl (long double x, long double *sinx, long double *cosx)
{
int32_t se, i0, i1;
/* High word of x. */
GET_LDOUBLE_WORDS (se, i0, i1, x);
/* |x| ~< pi/4 */
se &= 0x7fff;
if (se < 0x3ffe || (se == 0x3ffe && i0 <= 0xc90fdaa2))
{
*sinx = __kernel_sinl (x, 0.0, 0);
*cosx = __kernel_cosl (x, 0.0);
}
else if (se == 0x7fff)
{
/* 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:
*sinx = __kernel_sinl (y[0], y[1], 1);
*cosx = __kernel_cosl (y[0], y[1]);
break;
case 1:
*sinx = __kernel_cosl (y[0], y[1]);
*cosx = -__kernel_sinl (y[0], y[1], 1);
break;
case 2:
*sinx = -__kernel_sinl (y[0], y[1], 1);
*cosx = -__kernel_cosl (y[0], y[1]);
break;
default:
*sinx = -__kernel_cosl (y[0], y[1]);
*cosx = __kernel_sinl (y[0], y[1], 1);
break;
}
}
}
weak_alias (__sincosl, sincosl)