[PD] [OT] SSE/MMX tips?

Mathieu Bouchard matju at artengine.ca
Thu Sep 8 02:59:54 CEST 2011

On Wed, 7 Sep 2011, Mathieu Bouchard wrote:

> On Wed, 7 Sep 2011, Bill Gribble wrote:
>> So far iteration on plain floats seems to be the best I can come up with, 
>> but HADDPS is tantalizingly close to what I want to do.  Any hints?
> Once I thought that with some commutativity you could speed things up like 
> this :
> (f0+f1+f2+f3)+(f4+f5+f6+f7)+...
> can be rearranged as :
> (f0+f4+...)+(f1+f5+...)+(f2+f6+...)+(f3+f7+...)

But what I said does not apply to your case, because you want a scan, 
whether I didn't really read and assumed a fold.

I don't know how to optimise a scan.

| Mathieu Bouchard ---- tél: +1.514.383.3801 ---- Villeray, Montréal, QC

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