Article View: comp.arch
Article #1713Re: delayed branch
From: Herman Rubin
Date: Tue, 01 Aug 1989 11:40
Date: Tue, 01 Aug 1989 11:40
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In article <2246@taux01.UUCP>, cdddta@tasu76.UUCP (David Deitcher) writes: > "Delayed branch" is a technique used by RISC machines to make use of the > extra cycle needed to calculate branch targets. The compiler will put > an instruction after the branch to be executed by the CPU while the > branch target is being calculated. Does anyone have information as to > how often the compiler is able to put a useful instruction after the > branch as opposed to filling it with a NOP? This has nothing to do with the capabilities of the compiler, but I have often wanted to put one, or even several, instructions between a branch instruction and its execution. As most problems have a substantial amount of order independence of operations, I would be surprised if a useful instruction could not be inserted in well over 90% of the cases. -- Herman Rubin, Dept. of Statistics, Purdue Univ., West Lafayette IN47907 Phone: (317)494-6054 hrubin@l.cc.purdue.edu (Internet, bitnet, UUCP)
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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cwjcc!gatech!purdue!mentor.cc.purdue.edu!l.cc.purdue.edu!cikReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cwjcc!gatech!purdue!mentor.cc.purdue.edu!l.cc.purdue.edu!cik From: cik@l.cc.purdue.edu (Herman Rubin) Newsgroups: comp.arch Subject: Re: delayed branch Summary: I have often wanted to do so Message-ID: <1462@l.cc.purdue.edu> Date: 1 Aug 89 11:40:42 GMT References: <2246@taux01.UUCP> Organization: Purdue University Statistics Department Lines: 17