Improve memcpy for Atom

[Michael Zolotukhin]

> You should send a separate change for small size optimization.

A patch with improvement of memcpy for Atom on small sizes is attached.

Change Log:
2011-10-20  Michael Zolotukhin  <michael.v.zolotukhin@gmail.com>

       * sysdeps/i386/i686/multiarch/memcpy-ssse3.S: Update.
       XMM-moves are used for copying on small sizes.

-- 
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Best regards,
Michael V. Zolotukhin,
Software Engineer
Intel Corporation.
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