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From: gautier_niouzes@hotmail.com (Gautier)
Newsgroups: comp.lang.ada,comp.realtime,comp.software-eng
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
Date: 9 Mar 2005 09:01:35 -0800
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Xref: g2news1.google.com comp.lang.ada:8952 comp.realtime:1142
 comp.software-eng:4700
Date: 2005-03-09T09:01:35-08:00
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> CTips wrote:
> > Actually, I can verify that: if I look at the computer shootout 
> > http://shootout.alioth.debian.org/great/, I find that gcc C beats gnat 
> > Ada pretty much across the board; actually, Ada's performance sucks 
> > pretty much across the board. One of gcc C or Intel C is generally among 
> > the top few programs, while with a couple of exceptions, Gnat Ada is 
> > around the middle. In matrix multiply it gets beaten by LISP, Java, and 
> > Python!!! (How can you get beaten by Python? The mind boggles!)

Martin Dowie:

> It's very easy when you don't switch on _any_ optimizations! :-)
> 
> GNAT is being compiled with the equivalent of "-O0" and GCC C is getting 
> "-O3".

Where are the GNAT options stored indeed (I scanned the CVS tree in vain) ?
The correct GNAT options for a shootout should be at least
-O2
-funroll-loops
-gnatp (suppress all checks)
-gnatn (cross-unit inlining for pragma Inline)
______________________________________________________________
Gautier     --     http://www.mysunrise.ch/users/gdm/index.htm
Ada programming -- http://www.mysunrise.ch/users/gdm/gsoft.htm

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