On Wed, 19 Feb 2003, Abramo Bagnara wrote:
> Jaroslav Kysela wrote:
> >
> > I've implemented the whole transfer and mix loop in assembly and it works
> > without any drastic impact on CPU usage. I tried to optimize the assembler
> > part as much as I can, but if some assembler guru want to give a glance,
> > I'll appreciate it. The function is named mix_areas1() in
> > alsa-lib/src/pcm/pcm_dmix.c.
>
> one comment:
>
> It's better to execute interleaved check once and not in mix_areas
Done. I was tired enough yesterday to bother with these details.
> one objection:
>
> I doubt very much that you gain anything coding the mixing loop in
> assembler, you've data showing that?
I think that I spent some ticks by duplicating code for saturation and
also the main while{} loop is more effective than GCC generates. But it's
only guess.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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