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Date: Sun, 22 Oct 2006 22:00:09 +0200
From: Gautier <gautier@fakeaddress.nil>
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Subject: Re: GNAT compiler switches and optimization
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Date: 2006-10-22T22:00:09+02:00
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Damien Carbonne:

> I've been following this thread for some times and I'm not a Fortran 
> Guru,however, IIRC, Fortran arrays and Ada arrays don't have the same 
> memory layout (Something like row major order and column major order).
> I've not compared programs of this thread with care, but I've the 
> feeling that this could change things.
> Some years ago, I had to mix Ada and Fortran, and I remember that we had 
> to invert loops order to obtain the same result.
> One would need to add 'pragma Convention (Fortran, Real_Matrix)' on Ada 
> side to obtain the same result, or to exchange loops.
> My knowledge of Fortran was limited to Fortran 77, and I don't know if 
> this is still valid with Fortran 95 or later.
> But if is still true, I would not consider the 2 programs as equivalent.

The question of Fortran's array storage has been treated earlier in this 
discussion, you just happened to add more noise by not reading enough posts 
;-). Look at the post of Martin Krischik, 20.10.06 18:30 CET... it shows the 
most serious testing so far, with the exact sources used for testing.
Cheers, Gautier
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