[Bug middle-end/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 #12 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> No. You only assume an alias if _both_ fields are bit fields.
> But in my example only one "a" is a volatile bit field the other
> is a normal member "b".

Then they won't be affected by the bug, see my explanation to Richard.