Article View: comp.lang.fortran
Article #6549Re: True probabilistic rounding [was Re: Precision ...]
From: Iain McClatchie
Date: Fri, 03 Oct 2003 00:29
Date: Fri, 03 Oct 2003 00:29
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Nick> ...when calculating a vertex's coordinates and consistency Nick> is critical, do it once and save it. They can't. DRAM pins cost more than multipliers. As for optimization, they just have to control their optimizers so that if two different code paths have to generate identical results, they do. That's just part of graphics engineering. Nick> I was actually referring to the use in dithering, which is somewhere Nick> that true probabilistic rounding is much superior to any deterministic Nick> rounding. Sounds good. That's really FP->int. Which is a great opportunity to get off topic. The human retina has loads more dynamic range than 1:256. The analog connection between a video board and the monitor has limited dynamic range, but now that we've got DVI cables, the limiting factor in dynamic range is all in one unit: the drivers and liquid crystal or electron guns and phosphors of the displays. Surely it's time for more dynamic range. And since the retina, at least, has nonlinear response, perhaps we need floating-point DACs driving these displays?
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: fd4af,7830916812112af0 X-Google-Attributes: gidfd4af,public X-Google-Thread: 1094ba,7830916812112af0 X-Google-Attributes: gid1094ba,public X-Google-Thread: 102b75,7830916812112af0 X-Google-Attributes: gid102b75,public X-Google-ArrivalTime: 2003-10-02 17:29:13 PST Path: arc1-ca.pugleaf.net!archiver1.google.com!postnews1.google.com!not-for-mail From: iain-3@truecircuits.com (Iain McClatchie) Newsgroups: comp.lang.fortran,comp.arch,bit.listserv.ibm-main Subject: Re: True probabilistic rounding [was Re: Precision ...] Date: 2 Oct 2003 17:29:12 -0700 Organization: http://groups.google.com Lines: 23 Message-ID: <45022fc8.0310021629.61bd0be4@posting.google.com> References: <dG4db.598668$uu5.97984@sccrnsc04> <blbmni$g2$1@pegasus.csx.cam.ac. <ble09h$pn2$1@pegasus.csx.cam.ac.uk> <45022fc8.0310021010.4aaf0e5e@posting.google.com> <blhr8a$916$1@pegasus.csx.cam.ac.uk> NNTP-Posting-Host: 64.164.5.210 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: posting.google.com 1065140953 1781 127.0.0.1 (3 Oct 2003 00:29:13 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Fri, 3 Oct 2003 00:29:13 +0000 (UTC)