Suppose you could build a CPU where the clock cycle time was different for each instruction. What would the speedup of this new CPU be over the CPU presented in Figure 4.21 given the instruction mix below?

Figure 4.21

PC Add Read address Instruction [31-0] Instruction [31-26] Instruction [25-21] Instruction [20-16] Instruction Instruction [15-11] memory Control Instruction [15-0] RegDs! Branch MemRead MemtoReg ALUOP MemWrite ALUSrc RegWrite Read register 1 Read data 1 Read register 2 Write Read register data 2 Write data Registers 16 Sign- extend 32 Instruction (5-0) Shift left 2 Max. Add ALU control ALU ALU result Zero ALU result ( MUX- C Address Read data Write Data data memory Max,