4.12 Performance comparison and speedup Consider two different implementations Mi (1 GHz) and M2 (1.5 GHz) of the same instruction set. There are three classes of instructions with the following CPIs: CPI for M2 2 CPI for M i Class a. What are the peak performances of Mi and M2 expressed as MIPS? b. Show that if half the instructions executed in a certain program are from class A and the rest are divided equally among classes B and C, then M2 is faster than Mi c. Show that the second assumption in part b is redundant. In other words, if half the instructions executed in a certain program are from class A then M2 will always be faster than Mi, regardless of the distribution of the remaining instructions among classes B and C