From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <cgen-return-1004-listarch-cgen=sources.redhat.com@sources.redhat.com>
Received: (qmail 16387 invoked by alias); 24 Jun 2002 15:18:20 -0000
Mailing-List: contact cgen-help@sources.redhat.com; run by ezmlm
Precedence: bulk
List-Subscribe: <mailto:cgen-subscribe@sources.redhat.com>
List-Archive: <http://sources.redhat.com/ml/cgen/>
List-Post: <mailto:cgen@sources.redhat.com>
List-Help: <mailto:cgen-help@sources.redhat.com>, <http://sources.redhat.com/lists.html#faqs>
Sender: cgen-owner@sources.redhat.com
Received: (qmail 16380 invoked from network); 24 Jun 2002 15:18:20 -0000
Received: from unknown (HELO neon-gw.transmeta.com) (63.209.4.196)
  by sources.redhat.com with SMTP; 24 Jun 2002 15:18:20 -0000
Received: (from root@localhost)
	by neon-gw.transmeta.com (8.9.3/8.9.3) id IAA02595;
	Mon, 24 Jun 2002 08:18:17 -0700
Received: from mailhost.transmeta.com(10.1.1.15) by neon-gw.transmeta.com via smap (V2.1)
	id xma002568; Mon, 24 Jun 02 08:18:09 -0700
Received: from casey.transmeta.com (casey.transmeta.com [10.10.25.22])
	by deepthought.transmeta.com (8.11.6/8.11.6) with ESMTP id g5OFIBj21177;
	Mon, 24 Jun 2002 08:18:11 -0700 (PDT)
Received: (from dje@localhost) by casey.transmeta.com (8.9.3/8.7.3) id IAA09693; Mon, 24 Jun 2002 08:18:11 -0700
From: Doug Evans <dje@transmeta.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <15639.14387.11726.547375@casey.transmeta.com>
Date: Mon, 24 Jun 2002 08:18:00 -0000
To: Hans-Peter Nilsson <hans-peter.nilsson@axis.com>
Cc: cgen@sources.redhat.com
Subject: Re: [RFA:] Fix lsb? bug with insn fields beyond base insn size.
In-Reply-To: <200206241511.RAA07347@ignucius.axis.se>
References: <15635.37490.634021.373881@casey.transmeta.com>
	<200206241511.RAA07347@ignucius.axis.se>
X-SW-Source: 2002-q2/txt/msg00037.txt.bz2

Hans-Peter Nilsson writes:
 > The highest bit-number minus the lowest bit-number is the
 > number of bits less one.

Assuming one defines the field to be [low,high].
Another legitimate definition, within a localized context such
as intermediates used to produce some final result, is [low,high).
I'm sure there are other contexts where such a definition is legitimate.

 > If the field starts at bit 2 and ends
 > at bit 2 it's one bit long.

Such a field can also be written, setting aside bit numbering issues, [2,3).