[PATCH] Add x86-64 memmove with unaligned load/store and rep movsb

[H.J. Lu]

The goal of this patch is to replace SSE2 memcpy.S,
memcpy-avx-unaligned.S and memmove-avx-unaligned.S as well as
provide SSE2 memmove with faster alternatives.  bench-memcpy and
bench-memmove data on various Intel and AMD processors are at

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

Any comments, feedbacks?


-- 
H.J.
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