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For a particular computer, the CPI for certain types of instructions is as follows: ALU operations, 2 cycles, make up 25% of dynamic (run-time) instruction

For a particular computer, the CPI for certain types of instructions is as follows:

ALU operations, 2 cycles, make up 25% of dynamic (run-time) instruction count

Load/store operations, 10 cycles, 30% of dynamic instruction count

Control flow, 3 cycles, 20% of dynamic instruction count

All other instructions, 1 cycle

What is the average CPI?

Suppose there is an optimization in which the CPI of load/store is reduced to 5, but cycle

time is lengthened by 20%. What is the speedup due to this optimization?

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