1#include "libm.h"
2
3#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
4long double coshl(long double x)
5{
6 return cosh(x);
7}
8#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
9long double coshl(long double x)
10{
11 union ldshape u = {x};
12 unsigned ex = u.i.se & 0x7fff;
13 uint32_t w;
14 long double t;
15
16 /* |x| */
17 u.i.se = ex;
18 x = u.f;
19 w = u.i.m >> 32;
20
21 /* |x| < log(2) */
22 if (ex < 0x3fff-1 || (ex == 0x3fff-1 && w < 0xb17217f7)) {
23 if (ex < 0x3fff-32) {
24 FORCE_EVAL(x + 0x1p120f);
25 return 1;
26 }
27 t = expm1l(x);
28 return 1 + t*t/(2*(1+t));
29 }
30
31 /* |x| < log(LDBL_MAX) */
32 if (ex < 0x3fff+13 || (ex == 0x3fff+13 && w < 0xb17217f7)) {
33 t = expl(x);
34 return 0.5*(t + 1/t);
35 }
36
37 /* |x| > log(LDBL_MAX) or nan */
38 t = expl(0.5*x);
39 return 0.5*t*t;
40}
41#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
42// TODO: broken implementation to make things compile
43long double coshl(long double x)
44{
45 return cosh(x);
46}
47#endif