4.27 Problems in this exercise refer to the following sequence of instructions, and assume that it is executed on a five-stage pipelined datapath ADD X5, X2. X1 LDUR X3, [X5, #41 LDUR X2, [X2, #0 ] ORR X3, X5. X3 STUR X3, [X5, #0] 4.27.1 [5] If there is no forwarding or hazard detection, insert NOPs to ensure correct execution 4.27.2 [10] Now, change and/or rearrange the code to minimize the number of NOPs needed. You can assume register X7 can be used to hold temporary values in your modified code. 4.27.3 [10] If the processor has forwarding, but we forgot to implement the hazard detection unit, what happens when the original code executes? 4.27.4 [20] If there is no forwarding, what new input and output signals do we need for the hazard detection unit in Figure 4.59? Using this instruction sequence as an example, explain why each signal is needed. 4.27.6 [20] For the new hazard detection unit from 4.26.5, specify which output signals it asserts in each of the first five cycles during the execution of this code. 4.27 Problems in this exercise refer to the following sequence of instructions, and assume that it is executed on a five-stage pipelined datapath ADD X5, X2. X1 LDUR X3, [X5, #41 LDUR X2, [X2, #0 ] ORR X3, X5. X3 STUR X3, [X5, #0] 4.27.1 [5] If there is no forwarding or hazard detection, insert NOPs to ensure correct execution 4.27.2 [10] Now, change and/or rearrange the code to minimize the number of NOPs needed. You can assume register X7 can be used to hold temporary values in your modified code. 4.27.3 [10] If the processor has forwarding, but we forgot to implement the hazard detection unit, what happens when the original code executes? 4.27.4 [20] If there is no forwarding, what new input and output signals do we need for the hazard detection unit in Figure 4.59? Using this instruction sequence as an example, explain why each signal is needed. 4.27.6 [20] For the new hazard detection unit from 4.26.5, specify which output signals it asserts in each of the first five cycles during the execution of this code