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    SubjectRe: [PATCH 13/15] x86: add cmpxchg_flag() variant
    On 08/23/2011 03:15 PM, Jeremy Fitzhardinge wrote:
    > However, having prototyped it, I dunno, it doesn't really seem like much
    > of a win for all the extra code it adds. I just can't get too excited
    > about an extra test instruction adjacent to a monster like a locked
    > cmpxchg. The jump variant avoids the test, but gcc still generates some
    > pretty bogus stuff:

    A compare is hardly a big cost, as you're quite correctly pointing out.


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