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Date: Sat, 21 Oct 2006 09:37:41 +0200
From: Gautier <gautier@fakeaddress.nil>
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Subject: Re: GNAT compiler switches and optimization
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Date: 2006-10-21T09:37:41+02:00
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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 ?
It needs some reconciliation...
A good thing in that discussion would be that everybody shows each time
- which GCC version
- which machine
- the execution time of the multiplication for both Ada and Fortran
- which version of the Ada code (matrix on stack/heap, Fortran or Ada convention)

Cheers, Gautier
______________________________________________________________
Ada programming -- http://www.mysunrise.ch/users/gdm/gsoft.htm

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