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    SubjectRe: [RFC][PATCH 0/5] arch: atomic rework
    On Fri, 21 Feb 2014, Paul E. McKenney wrote:

    > This needs to be as follows:
    >
    > [[carries_dependency]] int getzero(int i [[carries_dependency]])
    > {
    > return i - i;
    > }
    >
    > Otherwise dependencies won't get carried through it.

    C11 doesn't have attributes at all (and no specification regarding calls
    and dependencies that I can see). And the way I read the C++11
    specification of carries_dependency is that specifying carries_dependency
    is purely about increasing optimization of the caller: that if it isn't
    specified, then the caller doesn't know what dependencies might be
    carried. "Note: The carries_dependency attribute does not change the
    meaning of the program, but may result in generation of more efficient
    code. - end note".

    --
    Joseph S. Myers
    joseph@codesourcery.com


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