Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!nrl-cmf!cmcl2!brl-adm!umd5!purdue!i.cc.purdue.edu!j.cc.purdue.edu!pur-ee!uiucdcs!uxc.cso.uiuc.edu!ccvaxa!aglew
From: aglew@ccvaxa.UUCP
Newsgroups: comp.arch
Subject: Re: Performance increase - a suggestion
Message-ID: <28200093@ccvaxa>
Date: 9 Feb 88 00:41:00 GMT
References: <235@unicom.UUCP>
Lines: 18
Nf-ID: #R:unicom.UUCP:235:ccvaxa:28200093:000:865
Nf-From: ccvaxa.UUCP!aglew    Feb  8 18:41:00 1988


>Since, under machine arithmetic, a/b is NOT equal to a*(1/b), and since the
>IEEE floating-point standard demands EXACT rounding, I don't see how Newton-
>Raphson is any use an an IEEE environment.
>
>Gideon Yuval, +972-52-522255 (work), -2-690992 (home), yuval@taux01.nsc.com

Use Newton-Raphson to approximate 1/b, and then correct.


Andy "Krazy" Glew. Gould CSD-Urbana.    1101 E. University, Urbana, IL 61801   
    aglew@gould.com     	- preferred, if you have nameserver
    aglew@gswd-vms.gould.com    - if you don't
    aglew@gswd-vms.arpa 	- if you use DoD hosttable
    aglew%mycroft@gswd-vms.arpa - domains are supposed to make things easier?
   
My opinions are my own, and are not the opinions of my employer, or any
other organisation. I indicate my company only so that the reader may
account for any possible bias I may have towards our products.