Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84 exptools; site ihuxb.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!ihuxb!wfmans
From: wfmans@ihuxb.UUCP (w. mansfield)
Newsgroups: net.arch
Subject: Re: Cleverness in the WE-32001
Message-ID: <1121@ihuxb.UUCP>
Date: Thu, 25-Jul-85 11:37:14 EDT
Article-I.D.: ihuxb.1121
Posted: Thu Jul 25 11:37:14 1985
Date-Received: Sun, 28-Jul-85 14:44:51 EDT
Distribution: net
Organization: AT&T Bell Laboratories
Lines: 9

Mr Long comments that the WE-32001 contains a pc displacement addressing
mode that could be used to effect position independent code.  Yes it
exists, and I don't know specifically why the assembler doesn't use it.
The only possibilities that come to mind are that it might be easier
for the assembler to generate the absolute address mode, or that the
code might execute faster.  If you look closely at the operand
descripter encodings (at least for the 32100, I'm assuming that the
32001 is the same) you'll you'll see that using the PC with some addressing
modes causes special things to happen.