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From: nelsn@houxj.UUCP
Newsgroups: comp.arch
Subject: Re: Cordic chips
Message-ID: <185@houxj.UUCP>
Date: Thu, 2-Apr-87 09:36:23 EST
Article-I.D.: houxj.185
Posted: Thu Apr  2 09:36:23 1987
Date-Received: Sat, 4-Apr-87 15:24:38 EST
References: <3300001@uiucdcsm>
Organization: AT&T Bell Laboratories, Holmdel
Lines: 19

In article <3300001@uiucdcsm>, grunwald@uiucdcsm.cs.uiuc.edu writes:
> 
> 	Do any common FPU's use the CORDIC method for builtins? Are there any
> ways to access the CORDIC registers directly?
> 
> Dirk Grunwald
> Univ. of Illinois
> grunwald@m.cs.uiuc.edu

The WE32206 MAU from AT&T, and as far as I know, Motorola's 68881
and Intel's 80x87, all use CORDIC for their transcendental functions.
It stands for COordinate Rotational DIgital Computer. For a good reference,
see "A Unified Algorithm for Elementary Functions", J.S. Walther,
Spring Joint Computer Conference, 1971.
-- 
Matthew Nelson
AT&T Information Systems
ihnp4!houxj!nelsn
nelsn@houxj.ATT.COM