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    SubjectRe: P6 NOPs again: MPSC?
    Hugh Dickins wrote:
    >
    > Yup, I realized that (with || in place of &&): I meant that perhaps
    > it was supposed to say X86_64 || (!X86_GENERIC && (M686 || ....))
    > since quite a lot of other options there have "|| X86_64" to cover
    > all the 64-bit possibilities at once i.e. is it only MPSC that
    > needs to be added, or both MPSC and CPU_GENERIC?
    >

    No. The left-hand clause (X86_64 || !X86_GENERIC) indicates when using
    these NOPs are *permitted*; the right-hand clause indicates when doing
    so is *desirable*. The latter isn't, for example, for K8, even on 64 bits.

    -hpa



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