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| | #include "libm.h"
#ifdef LONG_DOUBLE_IS_BINARY64
long double cosl(long double x) {
return cos(x);
}
#elif defined(LONG_DOUBLE_IS_X87_EXTENDED) || defined(LONG_DOUBLE_IS_BINARY128)
long double cosl(long double x)
{
union ldshape u = {x};
unsigned n;
long double y[2], hi, lo;
u.i.se &= 0x7fff;
if (u.i.se == 0x7fff)
return x - x;
x = u.f;
if (x < M_PI_4) {
if (u.i.se < 0x3fff - LDBL_MANT_DIG)
/* raise inexact if x!=0 */
return 1.0 + x;
return __cosl(x, 0);
}
n = __rem_pio2l(x, y);
hi = y[0];
lo = y[1];
switch (n & 3) {
case 0:
return __cosl(hi, lo);
case 1:
return -__sinl(hi, lo, 1);
case 2:
return -__cosl(hi, lo);
case 3:
default:
return __sinl(hi, lo, 1);
}
}
#endif
|