Q6. Assume we have the following sequence of instructions, and assume that it is executed on a 5-stage pipelined datapath:

add r5,r2,r1

lw r3,4(r5)

lw r2,0(r2)

or r3,r5,r3

sw r3,0(r5)

a. If there is no forwarding or hazard detection, insert nops to ensure correct execution and draw the pipeline execution diagram.

b. Now use nops only when a hazard cannot be avoided by changing or rearranging these instructions and draw the pipeline execution diagram.

c. Now assume we schedule the above reordered instructions to be executed on a 2-issue statically scheduled processor, as shown below, draw the pipeline execution diagram again.