[Bug c++/47504] some constexpr calculations erroneously overflow when using negative numbers

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47504

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> 2011-03-16 
23:43:38 UTC ---
>which has implementation-defined behavior according to the C and C++ standards.

But that does not mean it has an overflow though, right?