[cairo] Re: [RFC] altivec optimization

[Ross Burton]

On Wed, 2007-01-24 at 15:20 +0100, Luca Barbato wrote:
> I'm writing optimizations for altivec, basically processing 4 pixels at
> time, the problem is that I have to call back the scalar version to
> finish the processing in case the width isn't multiple of 4.
> 
> Which is the best course of action? straight copy the scalar code inside
>  the vector functions or call the scalar function passing the remaining
> pixels?
> 
> I'll try to provide a working patch soon, for now the source is just a
> testcase that compares scalar and vector function outputs.

Wouldn't it be a good idea to use liboil for this sort of optimisations?
It has some pixel operations already and I'm sure if the operations
Cairo requires are not present, they can be added:

http://liboil.freedesktop.org/documentation/liboil-liboilfuncs-pixel.html

Ross
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Ross Burton                                 mail: ross at burtonini.com
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