[FFmpeg-devel] [PATCH 2/3] lavu/rational: use av_unlikely in av_d2q

Nicolas George george at nsup.org
Thu Feb 25 13:25:54 CET 2016


Le sextidi 6 ventôse, an CCXXIV, Ganesh Ajjanagadde a écrit :
> Actual performance benefit is impossible to accurately quantify due to the
> context-dependence of the branch predictor. Nonetheless, as a ballpark
> estimate, it yields ~ 5% improvements in testing via FATE on x86-64, Haswell+GCC.

Five percent is huge, if it is five percent of something relevant. Can you
give a few more details?

Regards,

-- 
  Nicolas George
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: Digital signature
URL: <http://ffmpeg.org/pipermail/ffmpeg-devel/attachments/20160225/e346280a/attachment.sig>


More information about the ffmpeg-devel mailing list