void
sincosl(long double x, long double *sn, long double *cs)
{
union IEEEl2bits z;
int e0, sgn;
long double y[2];
z.e = x;
sgn = z.bits.sign;
z.bits.sign = 0;
ENTERV();
/* Optimize the case where x is already within range. */
if (z.e < M_PI_4) {
/*
* If x = +-0 or x is a subnormal number, then sin(x) = x and
* cos(x) = 1.
*/
if (z.bits.exp == 0) {
*sn = x;
*cs = 1;
} else
__kernel_sincosl(x, 0, 0, sn, cs);
RETURNV();
}
/* If x = NaN or Inf, then sin(x) and cos(x) are NaN. */
if (z.bits.exp == 32767) {
*sn = x - x;
*cs = x - x;
RETURNV();
}
/* Range reduction. */
e0 = __ieee754_rem_pio2l(x, y);
switch (e0 & 3) {
case 0:
__kernel_sincosl(y[0], y[1], 1, sn, cs);
break;
case 1:
__kernel_sincosl(y[0], y[1], 1, cs, sn);
*cs = -*cs;
break;
case 2:
__kernel_sincosl(y[0], y[1], 1, sn, cs);
*sn = -*sn;
*cs = -*cs;
break;
default:
__kernel_sincosl(y[0], y[1], 1, cs, sn);
*sn = -*sn;
}
RETURNV();
}
void
__sincosl (_Float128 x, _Float128 *sinx, _Float128 *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, sinx, cosx, 0);
else if (ix >= 0x7fff000000000000LL)
{
/* sin(Inf or NaN) is NaN */
*sinx = *cosx = x - x;
if (isinf (x))
__set_errno (EDOM);
}
else
{
/* Argument reduction needed. */
_Float128 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;
}
}
}
