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From: philm%astroatc@astroatc.UUCP
Newsgroups: net.arch
Subject: Re: ORed indexes
Message-ID: <353@astroatc>
Date: Sat, 26-Apr-86 23:40:00 EDT
Article-I.D.: astroatc.353
Posted: Sat Apr 26 23:40:00 1986
Date-Received: Sun, 11-May-86 15:46:54 EDT
References: <5100066@ccvaxa>
Lines: 30

In article <5100066@ccvaxa> aglew@ccvaxa.UUCP writes:
>
>Another attempt to make life interesting:
>
>How would you react to an instruction set that had no indexed addressing
>mode, but did have a mode where a register was ORed into the address?
>
>I can vaguely recall having seen such a beast - is anyone familiar with it?
>I laughed then, but now I can see arguments for providing such an ORed index
>addressing mode, in the lack of true indexing.
> . . . . . . .
>
>Well, there you have it: ORed indexes. Tell me I'm brain damaged.
>
>Andy "Krazy" Glew. Gould CSD-Urbana.    USEnet:  ihnp4!uiucdcs!ccvaxa!aglew
>1101 E. University, Urbana, IL 61801    ARPAnet: aglew@gswd-vms

The PERQ workstation has OR'd indexing for its register file. The PERQ was 
one of the first workstations on the market.  It is a 2910/Custom ALU 
microengine with barrel shifter and Raster-Op. 


-- 
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Kirk  : Bones ?               Phil Mason, Astronautics Technical Center
Bones : He's dead Jim.        {Your Favorite System}!uwvax!astroatc!philm

My opinions are mine and not necessarily those of my employer.
(I would like to think that my employer believes in them too.)  :-)
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