Article View: comp.sys.powerpc
Article #9Re: ANSWER: algorithm to perform 64-bit / 32-bit signed & unsigned divide
From: bakke
Date: Tue, 06 Sep 1994 12:25
Date: Tue, 06 Sep 1994 12:25
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1371 bytes
>You'd think so, but unfortunately on the PPC601 the integer mul instructions >aren't pipelined and they stall the next instruction until they have >completed. >If a future PPC chip has either a) pipelined integer mul, or b) two or more >integer ALUs capable of doing muls at the same time, then you would be >correct. >I'd tend to write it your way anyway, since even on the PPC601 it won't be >worse than the original, and it might one day be better. >-- Bruce I think on the 604, of the three integer pipelines, one is dedicated to integer multiply/divide. -SB
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Path: arc1-ca.pugleaf.net!wupost!uwm.edu!news.alpha.net!MathWorks.Com!europa.eng.gtefsd.com!library.ucla.edu!agate!darkstar.UCSC.EDU!news.hal.COM!decwrl!pa.dec.com!nntpd.lkg.dec.com!mrnews.mro.dec.com!rock.enet.dec.com!bakke From: bakke@rock.enet.dec.com () Newsgroups: comp.sys.powerpc,comp.arch.arithmetic,gnu.misc.discuss,comp.programming,sci.math,alt.sources Subject: Re: ANSWER: algorithm to perform 64-bit / 32-bit signed & unsigned divide Date: 6 Sep 1994 12:25:27 GMT Organization: Digital Equipment Corporation Lines: 18 Distribution: world Message-ID: <34hn3n$rf0@mrnews.mro.dec.com> References: <usenet-0209941834550001@lowry.eche.ualberta.ca> <2861579804@hoult.actrix.gen.nz> Reply-To: bakke@rock.enet.dec.com () NNTP-Posting-Host: rock.enet.dec.com X-Newsreader: mxrn 6.18-5