From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,553a6b79b2471571
X-Google-Attributes: gid103376,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news2.google.com!news4.google.com!news2.volia.net!newsfeed01.sul.t-online.de!t-online.de!newsfeed.arcor.de!news.arcor.de!not-for-mail
Newsgroups: comp.lang.ada
Subject: Re: How do you bitwise operations in Ada '83 and '95
From: Georg Bauhaus <bauhaus@futureapps.de>
In-Reply-To: <130aai4of5k0s.1175ed13axp2v.dlg@40tude.net>
References: <9315684D-C216-4EDA-8852-0A6BD4C275B0@amado-alves.info>
	 <mailman.35.1153348231.30988.comp.lang.ada@ada-france.org>
	 <ulkqosl5w.fsf@acm.org> <1e7szqc5niq0u$.1oqd2mhiiccyx.dlg@40tude.net>
	 <ur70fp9dx.fsf@acm.org> <71nkuwdmd7v5.xs4ho9ifpcfx$.dlg@40tude.net>
	 <m2fyguhjbm.fsf@grendel.local> <130aai4of5k0s.1175ed13axp2v.dlg@40tude.net>
Content-Type: text/plain
Content-Transfer-Encoding: 7bit
Organization: #
Message-ID: <1153565549.10562.4.camel@localhost.localdomain>
Mime-Version: 1.0
X-Mailer: Evolution 2.4.1 
Date: Sat, 22 Jul 2006 12:52:29 +0200
NNTP-Posting-Date: 22 Jul 2006 12:52:03 MEST
NNTP-Posting-Host: daa4ca56.newsread2.arcor-online.net
X-Trace: 
 DXC=IoW>heGNc9n18V74W6`bolQ5U85hF6f;djW\KbG]kaMhU7^]5?JhlBnnDR>:Fa;F`gPCY\c7>ejVhLQ\DC0NJenon4HjUacX8Fi
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news2.google.com comp.lang.ada:5875
Date: 2006-07-22T12:52:03+02:00
List-Id: <comp.lang.ada>

On Sat, 2006-07-22 at 10:32 +0200, Dmitry A. Kazakov wrote:

>  Does ANSI C standard require (x<<1) == (x*2)?
> 
> As for Ada 95, ARM certainly does not. This is why Shift_* is not portable.

type Unsigned_n is mod 2**n;  -- Annex B.2

won't be portable for the same reason?

As for the bit representation of these intrinsic modular values,
wouldn't shift_left etc. have to provide a result that does
make sense, as per the AS-IF rule?