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From: Martin Krischik <krischik@users.sourceforge.net>
Newsgroups: comp.lang.ada
Subject: Re: GNAT compiler switches and optimization
Date: Mon, 23 Oct 2006 08:28:15 +0200
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Date: 2006-10-23T08:28:15+02:00
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Gautier schrieb:
> Jeffrey Creem:
> 
>> Note, I am the first one to jump to the defense of "Ada" in general 
>> but in this case, GNAT just plain sucks compared to GNU FORTRAN as it 
>> does a poor job on (at least) the inner loop (verified by looking at 
>> the output assembly)
> 
> There is something strange... Martin Krischik was able to trim the 
> overall time for the Ada code down to 24% of the first version (GNAT/GCC 
> 4.1.1).
> This should make the Ada program as fast as the FORTRAN one, shouldn't it ?
> Maybe it's because the test is done on a 64 bit machine ?

A 64 bit system doesn't need -march -mcpu and -msse2 as desperately. Try

 >gcc -dumpmachine
i686-pc-cygwin

For this system i686 is default.

Martin