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[Bug math/20495] x86_64 performance degradation due to AVX/SSE transition penalty
- From: "andrew.n.senkevich at gmail dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 25 Aug 2016 20:03:33 +0000
- Subject: [Bug math/20495] x86_64 performance degradation due to AVX/SSE transition penalty
- Auto-submitted: auto-generated
- References: <bug-20495-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=20495
--- Comment #8 from Andrew Senkevich <andrew.n.senkevich at gmail dot com> ---
(In reply to Adam Stylinski from comment #2)
> Created attachment 9469 [details]
> Slower AVX example
>
> Compile this with -mavx & then compile it with -msse4. The -msse4 version
> will be faster as it's not hitting the SSE to AVX register transition
> penalty.
You can avoid slowdown also using "-Wl,-z,now".
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