[Bug libstdc++/50880] __complex_acosh() picks wrong complex branch

[gdr at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50880

--- Comment #18 from Gabriel Dos Reis <gdr at gcc dot gnu.org> 2011-11-02 12:48:47 UTC ---
(In reply to comment #16)
> Well, I guess this would be most of it:
> 
>   template<typename _Tp>
>     std::complex<_Tp>
>     __complex_acosh(const std::complex<_Tp>& __z)
>     {
>       return _Tp(2.0) * std::log(std::sqrt(_Tp(0.5) * (__z + _Tp(1.0)))
>                  + std::sqrt(_Tp(0.5) * (__z - _Tp(1.0))));
>     }

looks good -- hoping for log implementation to do the right thing.