Article View: comp.arch
Article #20488Re: undoing autoincrement
From: Herman Rubin
Date: Fri, 24 Mar 1989 11:47
Date: Fri, 24 Mar 1989 11:47
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1281 bytes
In article <21971@agate.BERKELEY.EDU>, matloff@tinman.Berkeley.EDU writes: < <In article <21931@agate.BERKELEY.EDU> matloff@iris.ucdavis.edu (Norm Matloff) writes: < <>In article xxx henry@utzoo.uucp (Henry Spencer) writes: > > Suppose there is an instruction containing autoincrement immediately following > a conditional branch instruction. If the pipe is such that the autoinc is > done during or before the branch decision, the autoinc will have to be undone. > > Again, all this depends on whether the pipe is designed that way. > Why is this problem restricted to autoincrement? Any action taken after a conditional branch instruction not wanted in the actual branch path taken may have to be undone. -- 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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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!mentor.cc.purdue.edu!l.cc.purdue.edu!cik From: cik@l.cc.purdue.edu (Herman Rubin) Newsgroups: comp.arch Subject: Re: undoing autoincrement Summary: Undoing anything Message-ID: <1184@l.cc.purdue.edu> Date: 24 Mar 89 11:47:20 GMT References: <21971@agate.BERKELEY.EDU> Organization: Purdue University Statistics Department Lines: 20