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    SubjectRe: [BK+PATCH] remove __constant_memcpy

    On Wed, 16 Apr 2003, Jeff Garzik wrote:
    > gcc's __builtin_memcpy performs the same function (and more) as the
    > kernel's __constant_memcpy. So, let's remove __constant_memcpy, and let
    > the compiler do it.

    Please don't.

    There's no way gcc will EVER get the SSE2 cases right. It just cannot do
    it. In fact, I live in fear that we will have to turn off the compiler
    intrisics entirely some day just because there is always the worry that
    gcc will start using FP.

    So the advantage of doing our own memcpy() is not that it's necessarily
    faster than the gcc built-in, but simply because I do not believe that the
    gcc people care enough about the kernel to let them make the choice.


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