[MPlayer-dev-eng] [PATCH] altivec scaler performance enhancement

[Diego Biurrun]

On Thu, Feb 09, 2006 at 10:12:14PM -0500, Alan Curry wrote:
> Michael Niedermayer writes the following:
> >
> >On Tue, Feb 07, 2006 at 05:50:56AM -0500, Alan Curry wrote:
> >> It would be better, I think, to just build the vectors that you're actually
> >> going to use. Or build them all just once and preserve them in the
> >> SwsContext, since they are just expanded versions of the v{Lum,Chr}Filter
> >> that is already in there.
> >
> >yes
> 
> This is the patch to move the v{Y,C}CoeffsBank vectors into the SwsContext,
> filling them in just once when the scaler is initialized, instead of building
> them and freeing them over and over. In my tests, it cuts CPU usage in half
> or better. Not just the scaler's CPU usage - the usage of the entire mplayer
> process! One of my tests went from being a 94% CPU hog to 33%.

Outstanding!  Works like a charm here, I'm seeing 30-50% performance
improvements.  Michael, OK to commit?

Diego