On Wed, 18 Apr 2007 13:04:22 -0700 (PDT)
David Miller <davem@davemloft.net> wrote:
>
> Although I don't think gcc does anything fancy since we don't
> use memcmp(). It's a tradeoff, we'd like to use unsigned long
> comparisons when both objects are aligned correctly but we also
> don't want it to use any more than one potentially mispredicted
> branch.
Again, memcmp() *cannot* be optimized, because its semantic is to compare bytes.
memcpy() can take into account alignement if known at compile time, not memcmp()
>
> We could add some alignment tests to the ethernet address
> comparison code, but it's probably more trouble than it's
> worth.
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--
Eric Dumazet <dada1@cosmosbay.com>
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