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Article #12028Re: IBM floating point using logarithms
From: Dan Aksel
Date: Tue, 11 Jun 1991 12:27
Date: Tue, 11 Jun 1991 12:27
20 lines
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1345 bytes
In article <1991Jun10.171824.10980@solbourne.com> McGuire@solbourne.com (Jim McGuire) writes: > "The key to the hybrid computational unit > is a new approach to representing logarithms > that closely parallels the IEEE P754 32-bit > floating-point format." > > "The result is a conversion method simple enough > to cast in hardware..." I've never heard of this. The technique is to take the log of a IEEE P754 number as it comes in from memory? Then mulitplies become adds, divisions become subtraction, exponentiate becomes multiplication... AND ADDITION AND SUBTRACTION BECOME A MESS ! I assume there is some quick translation to get a log of a number? I'd really like to hear more about this one. Anyone out there with more details, I'd appreciate a followup post. Thank you. --- Dan Aksel
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!wuarchive!emory!gatech!prism!mailer.cc.fsu.edu!uflorida!travis!hardy!dana From: dana@hardy.hdw.csd.harris.com (Dan Aksel) Newsgroups: comp.arch Subject: Re: IBM floating point using logarithms Message-ID: <3637@travis.csd.harris.com> Date: 11 Jun 91 12:27:00 GMT References: <1991Jun10.171824.10980@solbourne.com> Sender: news@travis.csd.harris.com Organization: Harris Computer Systems, Ft. Lauderdale, FL Lines: 20