Question

Problem 4 (15pts): (a) (5pts) Consider the following MIPS memory with data shown in hex, which are located in memory from address 0 through 15. Show the result of the MIPS instruction "lw Ss0,4(Sa0)" for machines in little-endian byte orders, where Sa0 4. Address Contents Address Contents 9b lb 2 4 6 10 b4 c5 12 13 14 15 3d 5f 70 7 8f (b) (10pts)Assume we have the following time, performance and architecture parameters in the specified units Ec- execution time in cycles/program Es- execution time in seconds/program Pr-performance rate in instructions/seconds CCT- clock cycle time in second/cycle CR = clock rate in cycle/second IC instructions in instructions/program CPI- average cycles per instruction in cycle/instruction Complete the following formulas with the appropriate parameter CR1 Problem 5 (10 pts): Several researchers have suggested that adding a register-memory addressing mode to a load- store machine might be useful. The idea is to replace sequence of two instructions "LW Stl, 0(Ss0), ADD S12, S12, St1" by one instruction "ADD St2, 0(S0)". Assume that the addition of this new instruction will reduce the total instruction count by 20%, but it will cause the clock cycle time to increase by 10%, and also cause CPI to increase by 10%. Please indicate if it is beneficial to add this new instruction? Show all work, simply giving an answer is not enough!

Answer 1

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