Subject: [PATCH] Add x86-64 memset with unaligned store and rep stosb

[H.J. Lu]

The goal of this patch is to replace SSE2 and AVX2 memset.S
with faster and smaller alternatives, also support 64-byte vector
register size.  bench-memset data on various Intel and AMD
processors is at

https://sourceware.org/bugzilla/show_bug.cgi?id=19881

Any comments, feedbacks?


-- 
H.J.
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