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[Bug string/19776] Improve sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S
- From: "hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Tue, 29 Mar 2016 18:24:45 +0000
- Subject: [Bug string/19776] Improve sysdeps/x86_64/multiarch/memcpy-sse2-unaligned.S
- Auto-submitted: auto-generated
- References: <bug-19776-131 at http dot sourceware dot org/bugzilla/>
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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