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

[hjl.tools at gmail dot com]

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

--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Florian Weimer from comment #13)
> This is not an exact duplicate, it needs a separate fix.

The fix for PR 20508 is extended to cover this:

https://sourceware.org/ml/libc-alpha/2016-08/msg00803.html

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