[Bug string/19776] Improve sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19776

--- Comment #29 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Carlos O'Donell from comment #28)
> Asked for clarification of performance loss for Ivybridge, Penryn, and
> Bulldozer:
> https://www.sourceware.org/ml/libc-alpha/2016-03/msg00701.html

The new one will replace the old one.  That is the new SSE2/AVX replaces the
old SSE2/AVX.  It won't change the choice of SSE2, SSSE3 nor AVX for a given
processor.  Performance on Penryn and Bulldozer won't change. Ivy bridge will
see performance gain with the new __memcpy_sse2_unaligned_erms.

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