Re: Octave optimizations (use liboil?)

[Søren Hauberg]

man, 15 02 2010 kl. 23:25 -0500, skrev John Swensen:
> I was recently looking at liboil to do some fast casting and copying and 
> began to wonder whether Octave could benefit from something like this.  I 
> know that many of the computations of Octave are optimized if compiled 
> against optimized BLAS/LAPACK implementations (e.g. Atlas), but what other 
> parts of Octave are already optimized and what parts are not.  I assume that 
> when I round floating point values and then use them as indices into an 
> image, there is a cast going on somewhere there.  Also, anytime I do an 
> explicit typecast it might benefit.  The nice thing about liboil is that it 
> is optimized for a set of CPUs that represent the majority of users.
> 
> Is there a benefit to incorporating something like this into Octave?

Such a thing could be interesting. I looked into liboil long time ago,
but got the impression, that while it was fast it was not very accurate.
I asked the author and he agreed with this observation. I don't know if
this is still the case, but it is a potential problem.

Soren