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/* Compute sine and cosine of argument.
Copyright (C) 1997-2018 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, see
<http://www.gnu.org/licenses/>. */
#include "quadmath-imp.h"
void
sincosq (__float128 x, __float128 *sinx, __float128 *cosx)
{
int64_t ix;
/* High word of x. */
GET_FLT128_MSW64 (ix, x);
/* |x| ~< pi/4 */
ix &= 0x7fffffffffffffffLL;
if (ix <= 0x3ffe921fb54442d1LL)
__quadmath_kernel_sincosq (x, 0, sinx, cosx, 0);
else if (ix >= 0x7fff000000000000LL)
{
/* sin(Inf or NaN) is NaN */
*sinx = *cosx = x - x;
if (isinfq (x))
errno = EDOM;
}
else
{
/* Argument reduction needed. */
__float128 y[2];
int n;
n = __quadmath_rem_pio2q (x, y);
switch (n & 3)
{
case 0:
__quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
break;
case 1:
__quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
*cosx = -*cosx;
break;
case 2:
__quadmath_kernel_sincosq (y[0], y[1], sinx, cosx, 1);
*sinx = -*sinx;
*cosx = -*cosx;
break;
default:
__quadmath_kernel_sincosq (y[0], y[1], cosx, sinx, 1);
*sinx = -*sinx;
break;
}
}
}
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