40 lines
739 B
C
40 lines
739 B
C
#include "libc/math/libm.h"
|
|
|
|
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
|
|
long double cosl(long double x) {
|
|
return cos(x);
|
|
}
|
|
#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
|
|
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
|