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    SubjectRe: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string.
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    "H. Peter Anvin" <hpa@zytor.com> writes:
    >
    > My personal opinion is that if we can show no significant slowdown on
    > P4, K8, P-M/Core 1, Core 2, and Nehalem then we can simply use this code

    The issue is Core 2.

    P4 uses a different path, and Core 1 doesn't use the 64bit code.

    > unconditionally. If one of them is radically worse than baseline, then
    > we have to do something conditional, which is a lot more complicated.

    I have an older patchkit which did this, and some more optimizations
    to this code.

    There was still one open issue, that is why I didn't post it. If there's
    interest I can post it.

    -Andi
    --
    ak@linux.intel.com -- Speaking for myself only.


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