Question: Assume for addition, multiplication and division instructions, a processor has CPIs of 2 , 1 0 , and 2 0 . Assume a program running

Assume for addition, multiplication and division instructions, a processor has CPIs of

2, 10,

and

20 .

Assume a program running on the processor has

5

million additions,

2

million multiplications and

1

million divisions. The processor has a

4

GHz clock frequency. Suppose an improvement is made only to the division to reduce its CPI. If the execution time of the entire program after the improvement must be

75 %

of the original time, what is the target CPI value for the division instruction?

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