1#include "libm.h"
2
3#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
4long double asinhl(long double x)
5{
6	return asinh(x);
7}
8#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
9/* asinh(x) = sign(x)*log(|x|+sqrt(x*x+1)) ~= x - x^3/6 + o(x^5) */
10long double asinhl(long double x)
11{
12	union ldshape u = {x};
13	unsigned e = u.i.se & 0x7fff;
14	unsigned s = u.i.se >> 15;
15
16	/* |x| */
17	u.i.se = e;
18	x = u.f;
19
20	if (e >= 0x3fff + 32) {
21		/* |x| >= 0x1p32 or inf or nan */
22		x = logl(x) + 0.693147180559945309417232121458176568L;
23	} else if (e >= 0x3fff + 1) {
24		/* |x| >= 2 */
25		x = logl(2*x + 1/(sqrtl(x*x+1)+x));
26	} else if (e >= 0x3fff - 32) {
27		/* |x| >= 0x1p-32 */
28		x = log1pl(x + x*x/(sqrtl(x*x+1)+1));
29	} else {
30		/* |x| < 0x1p-32, raise inexact if x!=0 */
31		FORCE_EVAL(x + 0x1p120f);
32	}
33	return s ? -x : x;
34}
35#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
36// TODO: broken implementation to make things compile
37long double asinhl(long double x)
38{
39	return asinh(x);
40}
41#endif
42