Re: Re: dmix plugin

[Abramo Bagnara <abramo.bagnara@libero.it>]

Jaroslav Kysela wrote:
> 
> 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.

I hope to find the time to check it this evening

-- 
Abramo Bagnara                       mailto:abramo.bagnara@libero.it

Opera Unica                          Phone: +39.546.656023
Via Emilia Interna, 140
48014 Castel Bolognese (RA) - Italy


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