[x264-devel] Re: x264 improvement

[David Wolstencroft]

Eric,

I might have mentioned before that I have some faster altivec code  
for the G4/G5, yet I'm a bit nervous to incorporate it due to my  
employer. If you would like to add it "silently", that would be great.

- David


On Mar 11, 2006, at 7:23 AM, Eric Petit wrote:

> Firas Al-Tahan wrote:
>> Why did this stop? Is it because Apple went with Intel? Off the  
>> top of your head - was it optimized very well?
>>  From what I'm seeing, Core Duo Mac Mini's at 1.63GHz are getting  
>> double the frame rates of my Dual Processor G5 at 2.0GHz. As you  
>> can imagine - I'm not impressed! I can see there has been Altivec  
>> work done - but I'm not sure how much and how up to date it is.
>> Where / who would I need to get in contact with to get the ball  
>> rolling again?
>
>  I just didn't have much time to keep working on it. x264 is  
> clearly not as optimized for PPC as it is for x86 (Altivec provides  
> a ~100% speed bump from the C version, whereas MMX/SSE provide a 300 
> +% speed bump). Some parts aren't optimized at all, and others  
> could certainly be optimized better (I'm no AltiVec guru, and  
> especially, dealing with AltiVec and unaligned data everywhere gave  
> me a hard time).
>
>  If you or someone else can spend some time to it, I'll sure try to  
> answer any question you might have.
>
> -- 
> Eric Petit
>
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