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Iitm ms/direct phd written test question

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There are 1000 instructions in a program.They are like lw, r, lw, r, lw, .....

lw instructions are load/store type and r instructions are non load/store type.Each lw instruction is dependent only on  rightmost r instruction on it's left and each  r instruction depends only on rightmost lw instruction on it's left. The program is running on a 5 stage(IF,ID,EX,MEM,WB) pipeline.Operand forwarding is used here.What will be the effective cpi?

A) 1.204

B) 1.504

C) 2.204

D) 2.504
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