From help-request at octave dot org Wed Dec 22 12:56:38 2004
Subject: Re: Compilation 2.1.64 on mac osX(was: DOCSTRINGS up to date)
From: Per Persson <persquare at mac dot com>
To: Samir Sharshar <samir dot sharshar at mac dot com>
Cc: help at octave dot org
Date: Wed, 22 Dec 2004 19:58:23 +0100


On Dec 22, 2004, at 19:26, Samir Sharshar wrote:
>
> Well the default gcc options given by the configure script build 
> 2.1.64 without errors... but poor perfs. The better I can have (for 
> the moment) is to pass
>
> FFLAGS='-O5 -funroll-loops'
> CFLAGS='-O3 -mcpu=G5 -mtune=G5 -faltivec'

I wouldn't put too much faith in -faltivec, AFAIK it only *enables* the 
use of SIMD intructions, it doesn't actually change the code that is 
generated... :-( That *might* change with gcc 4.0 which supposedly has 
auto-vectorization features, but don't expect miracles.

>
> I'm going on finding the best options... and tell you back

Excellent, good luck!
Per

PS. To verify that your code is linked against vecLib, run "otool -L 
/path/to/octave" and check the output.



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