For the below set of instructions, assume a 5 stage pipeline that there is no hardware forwarding or hazard detection. The compiler/assembler must insert nops where the data hazard exists to insure the correct answer.

a) Rewrite the code by inserting nop(s) in the proper location to insure the correct result.

lw x8, 120(x5)

sub x5, x5, x8

and x8, x8, x9

add x8, x8, x5

b) If the 5-stage pipeline now added forwarding from the MEMWB pipeline register with no hardware data hazard detection, rewrite the assembly with the appropriate NOPs where required to insure proper operation.

c) If the 5-stage pipeline now added forwarding from just the EXMEM pipeline register with no hardware data hazard detection, rewrite the assembly with the appropriate NOPs where required to insure proper operation.