[Bug dynamic-link/20508] _dl_runtime_resolve_avx/_dl_runtime_profile_avx512 cause transition penalty

[markus at selfnet dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=20508

markus at selfnet dot de changed:

           What    |Removed                     |Added
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                 CC|                            |markus at selfnet dot de

--- Comment #13 from markus at selfnet dot de ---
May I ask for a high priority to get this fixed in the stable versions?

With the dolphin emulator, we've seen an up to 80% slowdown on random
compilation settings and usages because of this issue:
https://forums.dolphin-emu.org/Thread-dolphin-uses-ffmpeg-to-play-show-the-videos-of-the-games

We use AVX128 and SSE in a mixed way in our just in time compiler, so we are
hit hard by this penalty. Especially as this thread run almost no C++ code. So
there was a good chance to never call VZEROUPPER at all. Debugging this
performance issue was a big pain.

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