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Re: pb with -ffast-math

From: Alain Baeckeroot
Subject: Re: pb with -ffast-math
Date: Thu, 16 Apr 2009 21:51:59 +0200
User-agent: KMail/1.9.9

Le 15/04/2009 à 19:56, Jaroslav Hajek  écrit :
> On Tue, Apr 14, 2009 at 9:54 AM, Alain Baeckeroot
> <address@hidden> wrote:
> >
> > i builded octave with additional optimisation flags
> I use -O3 -march=native -funroll-loops and get good results.
I'll try this.

> > And this is really not important, i doubt we can get another 20%
> > speed improvement.
> Depending on your code, you may get even much better improvements by
> switching to the development sources (it seems you use 3.0.5). An
> instance is the experience of F. Potorti:
Everythnig is vectorised, except one for-loop (iteration over time) which
 takes 90% of time !
We are going to write this short part in C in a .oct file.

I'll try latest develpment source to see what happens.


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