3 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
4 long double acoshl(long double x)
8 #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
9 /* acosh(x) = log(x + sqrt(x*x-1)) */
10 long double acoshl(long double x)
12 union ldshape u = {x};
13 int e = u.i.se & 0x7fff;
16 /* |x| < 2, invalid if x < 1 or nan */
17 return log1pl(x-1 + sqrtl((x-1)*(x-1)+2*(x-1)));
20 return logl(2*x - 1/(x+sqrtl(x*x-1)));
21 return logl(x) + 0.693147180559945309417232121458176568L;
23 #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
24 // TODO: broken implementation to make things compile
25 long double acoshl(long double x)