[Bf-committers] BIH progress update

[Joe Eagar]

Yves Poissant wrote:
>
> Thinking about, designing and developing a generic SIMD macro library or set 
> of classes would be a sidetrack that is way beyond my commitment. Could that 
> be an interesting SoC project? The main hurdle is not so much abstracting 
> the operations in an efficient way but the fact that the data layout for 
> SIMD operation is also specific plus memory alignment issues. This said, 
> abstracting the SIMD operations in an ultra optimal way is also a primary 
> requirement. My experience, so far, with SSE is that it is very easy to 
> loose any gain with just a little sloppy implementation.
>
>   
I thought Altivec and SSE both used the same memory layout structure 
(though Altivec does have more SIMD registers then SSE)?  If I remember 
right, they both require the same 16-byte alignment in memory as well, 
though I could be wrong.
>> BTW, do you have a link to that forum post? It sounds cool.
>>     
>
> http://ompf.org/forum/viewtopic.php?f=4&t=781
>   
Thanks.
> Look at post #4 for the c source file. It is cool indeed. I may try it just 
> for my own education to see how well it can really accelerate the ray to 
> scene intersection process.
>   
I'd be interested to know how your tests work out.
> If you are interested in SSE implementations, you should take a look at 
> Arauna : http://igad.nhtv.nl/~bikker/ and look at his kdtree.c source code.
>
>   
I'll take a look, thanks.

> Yves 
>
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