编译原理课件PPT 第9章.pptChapter9Codeoptimization,,pilercanuseregisters,selectinstructionsordopeepholetransformationsChapter9Codeoptimization)weassumethattheintermediatecodeconsistsofthree--flowanalysisData-flowanalysistransformationsChapter9Codeoptimization--=a*aT2=a*bT3=2*T2T4=T1+T3T5=b*bT6=T4+T5Notes:Anameinabasicblockissaidtobeliveatagivenpointifitsvalueisusedafterthatpointintheprogram,--)hesetofleaders,:Chapter9Codeoptimization:(1)Thefirststatementisaleader.(2)Anystatementthatisthetargetofaconditionalorunconditionalgotoisaleader.(3))Foreachleader,itsbasicblockconsist
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