[FFmpeg-devel] [PATCH] update doc/optimization.txt

[Jason Garrett-Glaser]

On Tue, Sep 21, 2010 at 6:30 AM, Michael Niedermayer <michaelni at gmx.at> wrote:
> On Tue, Sep 21, 2010 at 05:37:40AM -0700, Jason Garrett-Glaser wrote:
>> > interresting strawman argument
>> > noone was talking about cases that cannot easily be done in inline asm
>> > not that calling from inline would be impossible or anything but i surely
>> > agree that for these 0.1% of asm yasm is likely the better choice
>>
>> You mean this 99%. ?It's only 0.1% because you don't think about
>> optimizations that can't be done under your current system.
>
> please elaborate on what other optimizations are possible in yasm that cannot
> be done in inline asm.

Basically all optimizations that involve sharing code between
functions to reduce code size.  See common/x86/cabac-a.asm for an
example in x264, where all of x264's CABAC functions fit in under 256
bytes combined.

Most functions can benefit from such optimizations, and saving 50% on
code size is more valuable than any hypothetical function call
overhead.

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