討論串[理工] [計組] performance
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assume that multiply instructions take 12 cycles and account for 15% of the. instructions in a typical program, and the other 85% of the instructions.
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execution time = cycle time * cpi * # of instructions. old machine:. cycle time = 1 (normalized). cpi = 15% * 12 + 85% * 4 = 1.8 + 3.4 = 5.2. # of ins
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http://ppt.cc/(l5n. 數據 http://ppt.cc/-3bI. 94中山資工. 張凡上冊286頁38題. 上面那一題的ExeTime_modified. 1*(48% - 35%*2) + 1.4*35% + 1.7*15% + 1.2*2%. ----------------
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把各自的CPI乘上比例，然後對總指令比例作修正可得平均CPI. 1*(48% - 35%*20%). ^^^你是想打這個吧？. 題目說只要有一個指令做change，將會減少一個Arithmetic指令。. 但是題目只假設20%的data transfer指令被轉換了，. 所以Arithmetic指令
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