Article View: comp.sys.mac
Article #17417Re: Mac II and SANE...
From: Joel West
Date: Thu, 16 Jul 1987 01:59
Date: Thu, 16 Jul 1987 01:59
17 lines
1243 bytes
1243 bytes
You don't say what you're benchmarking; arithmetic, trig,
logs, whatever?
SANE can use the 881 for arithmetic, but the 881 has a rounding
error in the last digit (according to Apple) for the
trancendentals. For accuracy's sake, Apple recommends you use
SANE rather than the 881, and clearly the Mac II SANE strives
for the accuracy of the 128K ROM version rather than the speed
of the 881.
Don't forget that a sizable amount of the cost
of SANE is trap and package dispatching; for that, the linear
speedup of 68000 instructions is the payoff. That's why going
straight to the 881 is 20-100x as fast as a Plus.
--
Joel West, Palomar Software, Inc. (c/o UCSD)
{ucbvax,ihnp4}!sdcsvax!jww or jww@sdcsvax.ucsd.edu
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!ll-xn!ames!sdcsvax!jww From: jww@sdcsvax.UCSD.EDU (Joel West) Newsgroups: comp.sys.mac Subject: Re: Mac II and SANE... Message-ID: <3464@sdcsvax.UCSD.EDU> Date: Wed, 15-Jul-87 21:59:32 EDT Article-I.D.: sdcsvax.3464 Posted: Wed Jul 15 21:59:32 1987 Date-Received: Sat, 18-Jul-87 03:26:07 EDT References: <10882@decwrl.DEC.COM> Organization: Palomar Software, Inc., Vista, CA Lines: 17 Summary: Some SANity