[Bug string/18858] _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18858

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Carlos O'Donell from comment #3)
> (In reply to joseph@codesourcery.com from comment #1)
> > I think _HAVE_STRING_ARCH_mempcpy is expected to be defined only when 
> > mempcpy is an alternative entry point to memcpy, as otherwise using 
> > mempcpy will increase cache usage and so inlining the expansion in terms 
> > of memcpy is expected to be more efficient.
> 
> I think this needs to be backed up by some more performance measurements by
> Intel.

Did we have inline mempcpy performance measurements on Intel machines when
the change was made?

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