The following codes run on the five-stage pipelined datapath. for each piece of code,
answer the following questions.
a) without forwarding, insert the necessary number of ‘nops’ for the code to execute correctly
b) with the forwarding unit available (only supports forwards mem-> ex and wb-> ex), show
how the code will execute. mention the data that’s forwarded between the stages. use ‘nops’
only when necessary.
code 1:
sub t1, t2, t3
add t1, t4, t5
or t4, t2, t6
code 2:
and t2, t5, t1
sub t3, t2, t0
nor t7, t1, t5
code 3:
and t2, t5, t1
sub t3, t2, t0
nor t7, t2, t1
code 4:
lw t1, 22(t0)
and t2, t1, t3
code 5:
lw t1, 22(t0)
sub t6, t0, t2
xor t3, t1, t5