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Path: utzoo!watmath!clyde!burl!ulysses!mhuxj!ihnp4!inuxc!pur-ee!uiucdcsb!grunwald
From: grunwald@uiucdcsb.UUCP
Newsgroups: net.lang.c
Subject: Re: Re: C language hacking
Message-ID: <9000031@uiucdcsb.UUCP>
Date: Mon, 19-Nov-84 12:06:00 EST
Article-I.D.: uiucdcsb.9000031
Posted: Mon Nov 19 12:06:00 1984
Date-Received: Wed, 21-Nov-84 01:01:33 EST
References: <219@desint.UUCP>
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Nf-ID: #R:desint:-21900:uiucdcsb:9000031:000:488
Nf-From: uiucdcsb!grunwald    Nov 19 11:06:00 1984

Actually, one of the cute things about the CORDIC method is that it computes
the sin/cos by rotating a vector.

It turns out that you can use the CORDIC methods to rotate vectors for graphics
without needing to compute the Sin/Cos at all. But this does mean 3 adds
and shifts per bit for every vector rotated. A multiplication takes only 1 add
and shift per bit, but you need to do four multiplies for rotation. A classmate
made a VLSI chip to do just this in a VLSI design class I took.