[Bug middle-end/18029] an xor of a single bit bitfield is inefficient

[kazu at cs dot umass dot edu]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|a twiddleing of a           |an xor of a single bit
                   |                            |bitfield is inefficient


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18029