[x264-devel] Re: x264 improvement

[Eric Petit]

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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