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From: dewar@gnat.com (Robert Dewar)
Newsgroups: comp.lang.ada
Subject: Re: 64-bit integers in Ada
Date: 16 May 2002 19:28:01 -0700
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David Rasmussen <david.rasmussen@gmx.spam.egg.sausage.and.spam.net> wrote in message news:<3CE3978F.6070704@gmx.spam.egg.sausage.and.spam.net>...
> I understand that I can easily use an integer in Ada that has exactly 64 
> bits. But are there any guarantees that such a type would be mapped to 
> native integers on 64-bit machines or to a reasonable double 32-bit 
> implementation on 32-bit machines? At least, are compilers ok at this in 
> real life?
> 
> /David

You have to check the particular compiler. GNAT supports 64-bit arithmetic
on all targets, using whatever is appropriate efficient code to do so.