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[Bug math/20495] x86_64 performance degradation due to AVX/SSE transition penalty


https://sourceware.org/bugzilla/show_bug.cgi?id=20495

--- Comment #20 from Adam Stylinski <kungfujesus06 at gmail dot com> ---
(In reply to Florian Weimer from comment #19)
> (In reply to Adam Stylinski from comment #18)
> > Not sure, how do I point my GCC to target the new master of glibc without
> > actually replacing my distro's glibc?  
> 
> If you build glibc from source, you'll get a script, testrun.sh, which runs
> its argument against the newly built glibc:
> 
> https://sourceware.org/glibc/wiki/Testing/Builds

Yes, this definitely fixes it.

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