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/* Compute sine and cosine of argument.
Copyright (C) 1997-2021 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, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <math.h>
#include <math_private.h>
#include <libm-alias-ldouble.h>
void
__sincosl (long double x, long double *sinx, long double *cosx)
{
int32_t se, i0, i1 __attribute__ ((unused));
/* 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;
if (isinf (x))
__set_errno (EDOM);
}
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;
}
}
}
libm_alias_ldouble (__sincos, sincos)
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