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From: Colin Paul Gloster <Colin_Paul_Gloster@ACM.org>
Newsgroups: comp.lang.ada
Subject: Re: How do you bitwise operations in Ada '83 and '95
Date: Thu, 20 Jul 2006 11:29:28 +0200
Organization: CILEA
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Date: 2006-07-20T09:29:28+00:00
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On Thu, 20 Jul 2006, Georg Bauhaus wrote:

"Marius Amado-Alves wrote:

> Note that I don't do bit shifting. Instead I multiply or divide by a
> magnitude. I don't think bit shifting is portable.

Why should language defined Interfaces.Shift_Right,
Interfaces.Shift_Right_Arithmetic, Rotate etc. be any less
portable than language defined arithmetic, as implemented
by the same compiler?"

Interfaces.Shift_Right etc. are unportable in Ada:
WWW.AdaIC.org/standards/05aarm/html/AA-B-2.html#I7056

No actual implementation is required to have a datatype for Annex B 
identical to a replacement of Interfaces.Unsigned_n in another 
implementation.