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Consider a processor with a delayed branch that has three delay slots. Three compilers compiler A, compiler B and compiler C, could run on this processor. Compiler A can fill the first delay slot 60% of the time and the second delay slot 40% of the time and the third delay slot 20% of the time (filling delay slot is independent). Compiler B can fully fill all the three delay slots. Compiler C leaves all the slots empty. Assuming that branches account for 20% of all instructions and arithmetic/logic operations for the remaining 80% of the instructions for any program, what is the improvement of CPI with compiler B compared to CPI with compiler A and compared to CPI with compiler C? Assume that CPI of arithmetic/logic operations is 1.

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Computer Engineering, Engineering

Category:- Computer Engineering
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