Amdahl's Law Assume a program executes 30 million floating point in- structions, 80 million integer instructions, 20 million load, store, and branch instructions each. The CPI for each type of instruction is 4, 1, 3, 3, and 2, respectively, and the processor runs at a clock rate of 2 GHz. (a) By how much should we improve the CPI of the floating-point instructions so that the program runs 20% faster? (b) (4 points) Considering the original CPIs, by how much can we speed up the program if the CPI of Aoating-point instructions is reduced by 40% and the CPI of memory instructions is reduced by 20%? (e) (5 points) Considering the original CPIs, what is the theoretical maximum achievable speedup if we are allowed to only optimize the memory subsystem, with no feasibility constraints