[FFmpeg-devel] [PATCH 2/2] x86: hevc_mc: convert to ssse3

Christophe Gisquet christophe.gisquet at gmail.com
Sat Aug 23 18:23:07 CEST 2014


2014-08-23 17:48 GMT+02:00 Mickaël Raulet <mraulet at gmail.com>:
> For avx2 I have some to push to the trunk, I did merge it yesterday with
> all recent changes. But I don t remember what those tables looks like.

Well, my point was hypothetical, but I guess this means some conflicts
are to be expected when either patchset is merged.

Do you have specific (START/STOP_TIMER) and global (using time or
-benchmark option) measures?

> For 10 and 12bits, ssse3 should slow down the decoding since it uses 4 more
> instructions in the loop.

Not systematically, as out-of-order execution and several execution
ports can "hide" them. But those are too dependent for this and I
expect a loss and a need for a sse4 version.


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