Computer Organization and Design MIPS Edition, Fifth Edition: The Hardware/Software Interface (The Morgan Kaufmann Series in Computer Architecture and Design)
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Chapter 2, Problem 2.46.1E

Explanation of Solution

No”, the given design is not a good choice because the execution time is more to compute the problem it will slow down the computer.

Explanation:

The Cycle Per Instruction (CPI) can be calculated using the following formula:

CPI=clockrate×CPUtimeinstructioncount

Here, clock rates = 10, 1, 3

CPI times = 300, 500, 100

Instruction count = 300 + 500 + 100

          = 900

Initial CPI = 10×(300900)+1×(500900)+3×(100900)                 = 309+59+39                 = 389                 = 4.22

New number of arithmetic instruction = 0

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