Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!intercon!news
From: amanda@mermaid.intercon.com (Amanda Walker)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Lookup table vs  68881/2
Message-ID: <1710@intercon.com>
Date: 10 Jan 90 02:33:55 GMT
References: <9001091506.AA00567@cscwam.umd.edu>
Sender: news@intercon.com
Reply-To: amanda@mermaid.intercon.com (Amanda Walker)
Lines: 16

In article <9001091506.AA00567@cscwam.umd.edu>, rick@wam.umd.edu (Frederick E.
Brown) writes:
> Can anyone tell me which is faster: sin/cos lookup tables or using the
> 68881/2 on a mac II.  I'm writing a 3D program and want to know which has
> the performance edge.

Somebody did some timing on this recently.  Tables beat the FPU as long
as you don't have to do any interpolation (i.e. really huge tables), but
the FPU beat everything else, including tables with quadratic interpolation.

The 68882 is even better at trig than the 68881, which isn't too shabby
itself.

Amanda Walker
InterCon Systems Corporation
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