[Ffmpeg-devel] VP3/Theora Perfection
Thu May 19 16:03:33 CEST 2005
Michael Niedermayer wrote:
> hmm, ill try explain it again, no doubt my first try is a little strangely
> my dev tree got slower after a cvs up, i dont have the benchmark scores any
> more, and my dev tree changed since then so i cant rerun it easily
> testing the r1.57 -> r1.58 change on a clean tree shows that the new version
> is faster (see my first benchmark) but if -finline-limit=2000 is added then
> r1.57 is faster (see my second benchmark), its also faster then r1.58 without
Patient: "Doctor! It hurts when I do this."
Doctor: "So don't do that."
:) I'm confused (big surprise). The new code is faster with the standard
compilation line. So you used a non-standard compilation line to make
the new code slower?
> the new code is also significantly smaller then the old as it replaces a
> "large" switch with look up tables
> from all that evidence i conclude that gcc didnt inline unpack_token() or
> unpack_vlcs() orginally and that the speed increase seen on a clean tree is
> not because the function is really faster but because it is inlined
I think I understand. I will make some tests along these lines...
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