CPU Performance Equation - Example 3

• Frequency of FP instructions : 25%

• Average CPI of FP instructions : 4.0

• Average CPI of other instructions : 1.33

• Frequency of FPSQR = 2%

• CPI of FPSQR = 20

• Design Alternative 1: Reduce CPI of FPSQR from 20 to 2.

• Design Alternative 2: Reduce average CPI of all FP instruction to 2.

• Compare these two design alternatives using CPU Perf. equation.

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