申論題

2.4 Assume that 25% operations of a computation task are floating-point operations and average CPI (cycles per instruction) for floating-point operations and other operations are 4.0 and 1.33 respectively. Sup ppose that 2% of the floating-poi operations in the task are floating- -point division which has CPI = 20. Assume that the two design altemnatives are to decrease the CPI of the foating- point division to 2 or the decrease the average CPI of all floating-point operations to 2.5. Compare these two design alternatives using processor performance equation. Which design choice is better? Why? Hint: compute the CPI values of different designs. e the floating-point