Article View: comp.arch
Article #293580-20
From: Donald Lindsay
Date: Fri, 10 Nov 1989 21:12
Date: Fri, 10 Nov 1989 21:12
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1027 bytes
From the press: "...Digital's engineers isolated the core VAX instruction set, including 80% of the most used opcodes and optimized it to the VAX 9000 gate structure. The conversion didn't involve reducing - or RISCing - the instruction set but more accurately hardwiring it into a single-cycle instruction set. ... The other 20% of complex instructions execute with microcode as always..." If DEC would document exactly what's in that 80%, then VAX compiler writers could FINALLY settle the subject of choosing between different instruction sequences. -- Don D.C.Lindsay Carnegie Mellon Computer Science
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arc1-ca.pugleaf.net!utzoo!utgpu!utstat!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!samsung!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!MATHOM.GANDALF.CS.CMU.EDU!lindsayShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!utstat!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!samsung!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!MATHOM.GANDALF.CS.CMU.EDU!lindsay From: lindsay@MATHOM.GANDALF.CS.CMU.EDU (Donald Lindsay) Newsgroups: comp.arch Subject: 80-20 Message-ID: <6927@pt.cs.cmu.edu> Date: 10 Nov 89 21:12:59 GMT Organization: Carnegie-Mellon University, CS/RI Lines: 16