Article View: comp.lang.fortran
Article #6514Re: Precision of floating point multiply
From: Richard Maine
Date: Mon, 29 Sep 2003 19:18
Date: Mon, 29 Sep 2003 19:18
24 lines
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2599 bytes
Brian Inglis <Brian.Inglis@SystematicSw.ab.ca> writes: > On Mon, 29 Sep 2003 11:51:52 -0500 in alt.folklore.computers, > "GerardS" <GerardS@PrairieTech.Net> wrote: > >What if the number isn't normalized ? ___________________________Gerard S. > > IBM FP does not support denormals. Denormals are not the same thing as unnormalized numbers. Not the same thing at all. Correct - the IBM FP format has no such thing as denormals, but it does have unnormalized numbers. Conversely, the IEEE FP has denormals, but does not support storage of unnormalized numbers. The relationship between the two is tenuous. IEEE denormals are for very small values, almost underflowing. IBM unnormalized numbers can happen for any magnitude. The IBM FP format does support unnormalized numbers... though the assembly-language programmer is well advised to be careful about them. -- Richard Maine | Good judgment comes from experience; email: my first.last at org.domain | experience comes from bad judgment. org: nasa, domain: gov | -- Mark Twain
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fd4af,7830916812112af0 X-Google-Attributes: gidfd4af,public X-Google-Thread: fd705,7830916812112af0 X-Google-Attributes: gidfd705,public X-Google-Thread: 102b75,7830916812112af0 X-Google-Attributes: gid102b75,public X-Google-Thread: 1094ba,7830916812112af0 X-Google-Attributes: gid1094ba,public X-Google-ArrivalTime: 2003-09-29 12:25:27 PST Path: arc1-ca.pugleaf.net!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news.cis.ohio-state.edu!malgudi.oar.net!news.grc.nasa.gov!newsread.grc.nasa.gov!not-for-mail From: Richard Maine <nospam@see.signature> Newsgroups: comp.lang.fortran,comp.arch,bit.listserv.ibm-main,alt.folklore.computers Subject: Re: Precision of floating point multiply Date: 29 Sep 2003 12:18:29 -0700 Organization: NASA Dryden Lines: 24 Sender: maine@altair.dfrc.nasa.gov Message-ID: <ue3ceffloa.fsf@altair.dfrc.nasa.gov> References: <dG4db.598668$uu5.97984@sccrnsc04> <iu6fnvch0g09q9f335tt89ogfcj5jm2ovh@4ax.com> <kmRdb.626671$YN5.452649@sccrnsc01> <bl8q1g$iv7$1@pegasus.csx.cam.ac.uk> <xrXdb.631209$Ho3.121609@sccrnsc03> <ron-shepard-609A55.10533829092003@news.comcast.giganews.com> <uefziffu7c.fsf@altair.dfrc.nasa.gov> <vngokjk8nourca@corp.supernews.com> <cevgnvkev8rmbb4q6qtmnp1mm6a26ee17n@4ax.com> NNTP-Posting-Host: altair.dfrc.nasa.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii User-Agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Portable Code)