Article View: comp.lang.fortran
Article #6512Re: Precision of floating point multiply
From: Brian Inglis
Date: Mon, 29 Sep 2003 18:45
Date: Mon, 29 Sep 2003 18:45
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2823 bytes
On Mon, 29 Sep 2003 11:51:52 -0500 in alt.folklore.computers,
"GerardS" <GerardS@PrairieTech.Net> wrote:
>| Richard Maine wrote:
>|> Ron Shepard wrote:
>|> Are the exponents converted automatically with these instructions?
>|> If they aren't, then it seems odd to be able to convert between a
>|> double precision floating point value to a single precision value
>|> just by loading the value into a register.
>|
>| Add usual caveat about my memory, but the exponents don't *NEED*
>| converting. I recall thinking it sort of strange the first time I saw
>| floating point formats where the exponents weren't the same for single
>| and double. I've subsequently gotten used to it. Sounds to me like
>| you are so used to it that you didn't think of the other possibility. :-)
>
>What if the number isn't normalized ? ___________________________Gerard S.
IBM FP does not support denormals.
Thanks. Take care, Brian Inglis Calgary, Alberta, Canada
--
Brian.Inglis@CSi.com (Brian dot Inglis at SystematicSw dot ab dot ca)
fake address use address above to reply
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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: 1094ba,7830916812112af0 X-Google-Attributes: gid1094ba,public X-Google-Thread: 102b75,7830916812112af0 X-Google-Attributes: gid102b75,public X-Google-ArrivalTime: 2003-09-29 11:45:54 PST Path: arc1-ca.pugleaf.net!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!in.100proofnews.com!in.100proofnews.com!pd2nf1so.cg.shawcable.net!residential.shaw.ca!pd7tw2no.POSTED!53ab2750!not-for-mail X-Trace-PostClient-IP: 68.147.131.211 From: Brian Inglis <Brian.Inglis@SystematicSw.ab.ca> Newsgroups: comp.lang.fortran,comp.arch,bit.listserv.ibm-main,alt.folklore.computers Subject: Re: Precision of floating point multiply Organization: Systematic Software Reply-To: Brian.Inglis@SystematicSw.ab.ca Message-ID: <cevgnvkev8rmbb4q6qtmnp1mm6a26ee17n@4ax.com> 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> X-Newsreader: Forte Agent 1.93/32.576 English (American) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 24 Date: Mon, 29 Sep 2003 18:45:51 GMT NNTP-Posting-Host: 24.71.223.147 X-Complaints-To: abuse@shaw.ca X-Trace: pd7tw2no 1064861151 24.71.223.147 (Mon, 29 Sep 2003 12:45:51 MDT) NNTP-Posting-Date: Mon, 29 Sep 2003 12:45:51 MDT