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    SubjectRe: spin_unlock optimization(i386)

    On Fri, 26 Nov 1999, Erich Boleyn wrote:

    > > * you (speculatively) execute read instructions ahead of write
    > > instructions.
    > > * you do not send write instructions immediately out of the CPU core,
    > > they sit in a write buffer.
    > I'm starting to doubt myself a bit here (reads being hoisted above writes
    > with respect to externally observed stores vs. conflicts with the list of
    > uncommitted stores as being the trouble here), so I'm going to just check
    > on this one with the folks who implemented it here...

    my (fixed) test code doesnt show any causality violation. Manfred's code
    is a complex simulation of one given Linux code sequence, Manfred are you
    sure it's not buggy?

    -- mingo

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