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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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48
libc/math/tanhl.c Normal file
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#include "libc/math/libm.h"
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
long double tanhl(long double x)
{
return tanh(x);
}
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
long double tanhl(long double x)
{
union ldshape u = {x};
unsigned ex = u.i.se & 0x7fff;
unsigned sign = u.i.se & 0x8000;
uint32_t w;
long double t;
/* x = |x| */
u.i.se = ex;
x = u.f;
w = u.i.m >> 32;
if (ex > 0x3ffe || (ex == 0x3ffe && w > 0x8c9f53d5)) {
/* |x| > log(3)/2 ~= 0.5493 or nan */
if (ex >= 0x3fff+5) {
/* |x| >= 32 */
t = 1 + 0/(x + 0x1p-120f);
} else {
t = expm1l(2*x);
t = 1 - 2/(t+2);
}
} else if (ex > 0x3ffd || (ex == 0x3ffd && w > 0x82c577d4)) {
/* |x| > log(5/3)/2 ~= 0.2554 */
t = expm1l(2*x);
t = t/(t+2);
} else {
/* |x| is small */
t = expm1l(-2*x);
t = -t/(t+2);
}
return sign ? -t : t;
}
#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
// TODO: broken implementation to make things compile
long double tanhl(long double x)
{
return tanh(x);
}
#endif