Re: GNAT compiler switches and optimization

[Damien Carbonne <damien.carbonne@free.fr>]

Jeffrey Creem a �crit :
> Followup on the bug report.
> 
> One of the comments asserted that the two programs were not equivilent 
> though I am not yet 100% convinced that I believe it yet.
> 
<snip>
> 
> 
> Can someone that understands FORTRAN better make an argument about the 
> "closeness" of this approach v.s. the other?

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.

Regards

Damien Carbonne