[Bug tree-optimization/58570] [4.9 Regression] wrong code for bitfields at -O2 and above

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58570

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> What if both bit fields have different DECL_BIT_FIELD_REPRESENTATIVE?
> 
> Then they can't possibly overlap?

Probably, yes, that could be a nice enhancement.