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From: dewar@cs.nyu.edu (Robert Dewar)
Newsgroups: comp.lang.ada
Subject: Re: 64 bit integer support as native type
Date: 23 Sep 1994 11:34:49 -0400
Organization: Courant Institute of Mathematical Sciences
Message-ID: <35usip$g61@schonberg.cs.nyu.edu>
References: <35setv$7nq@walters.East.Sun.COM>
NNTP-Posting-Host: schonberg.cs.nyu.edu
Date: 1994-09-23T11:34:49-04:00
List-Id: <comp.lang.ada>

The 83 RM is not even slightly in the business of defining what integer
types are available. The 9X RM has some very minimal, pretty much
meaningless requirements, about integer sizes.

The one notable exception is that decimal types must support decent
precision, equivalent to 64 binary bits, if the IS annex is supported,
so that is one possible totally portable route in Ada 9X.

For integer types, the idea is that your implementor provides the
appropriate set of integer types.

You have two choices. Either use a compiler that supports 64-bit integer
types. FOr example, all versions of GNAT support at least 64-bit integer
types.

OR, put your own multiple preicision routines to gether (I think that
Bob Eachus has some portable routines for high precision integer arithmetic!)