[FFmpeg-devel] [PATCH] SSE RDFT

Måns Rullgård mans
Thu Jun 24 23:26:35 CEST 2010

Jason Garrett-Glaser <darkshikari at gmail.com> writes:

> 2010/6/24 M?ns Rullg?rd <mans at mansr.com>:
>> Michael Niedermayer <michaelni at gmx.at> writes:
>>> btw, speaking of yasm, a not too long while ago i realized that configure
>>> simply compiles without yasm optimizations if yasm isnt installed
>>> i noticed it just because x264 doesnt and warns, we should do the same
>>> this issue alone weighs heavier than any difference between inline and
>>> yasm. Because loosing the optimizations without the user knowing is really
>>> bad.
>> Done.
> This is not sufficient.  From years of experience with x264, people
> will NEVER NOTICE the configure warning, and will proceed to compile
> obliviously.  They will then complain incessantly about slow it is.
> This is doubly important with more and more of ffmpeg's asm being in
> yasm -- particularly the upcoming VP8 decoder, where we are going to
> market ourselves on speed.
> I suggest that configure fail with an error (telling the user to
> install yasm or disable asm) if the following conditions are true:
> 1) architecture is x86 or x86_64
> 2) --disable-mmx is not set
> 3) --disable-yasm is not set

Sounds good to me.  All in favour?

M?ns Rullg?rd
mans at mansr.com

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