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	Fri, 20 Oct 2006 13:30:58 CEST
From: Duncan Sands <duncan.sands@math.u-psud.fr>
To: comp.lang.ada@ada-france.org
Subject: Re: GNAT compiler switches and optimization
Date: Fri, 20 Oct 2006 13:04:55 +0200
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Date: 2006-10-20T13:35:02+02:00

On Friday 20 October 2006 12:47, tkrauss wrote:
> I'm a bit stuck trying to figure out how to coax more performance
> out of some Ada code.  I suspect there is something simple (like
> compiler switches) but I'm missing it.  As an example I'm using
> a simple matrix multiply and comparing it to similar code in
> Fortran.  Unfortunately the Ada code takes 3-4 times as long.

GNAT GPL 2006 is based on gcc 3.4.6.  For fortran you are using
gcc 4.2.0.  Try using comparable compiler versions, eg: an Ada
aware gcc 4.2.0 (several linux distributions provide this) or
a gcc 3.4.6 version of fortran (i.e. some version of g77).

Ciao,

Duncan.