NaN slowdown with some processors

[David Bateman]

David Bateman wrote:
>
> With a Core2 Duo 2.2GHz T7500 processor
>
> octave:3> a=zeros(300,300);tic;b=(1.0+a)*a;toc
> Elapsed time is 0.00938201 seconds.
> octave:4>      a=zeros(300,300);tic;b=(NaN+a)*a;toc
> Elapsed time is 0.00932693 seconds.
>   

Sorry this is also with Atlas 3.8.1 64bit SSE3  linked in. Not sure what
would be the result if I was using a 32bit build..

D.
 


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David Bateman                                David.Bateman at motorola.com
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