$5.(10$ points$)$ Consider the instruction sequence below:

ld x$28,4($x$5)$

add x$29,$ x$6,$ x$7$

sub x$30,$ x$28,$ x$29$

sd x$30,0($x$11)$

$($a$)(3$ points$)$ List all the data dependencies, regardless of whether they cause any hazard or not.

$($b$)(3$ points$)$ Assume that the instruction sequence is executed on a five$-$stage pipelined processor

with forwarding. Are there any hazards that will require the pipeline to stall because they

cannot be resolved by forwarding? Justify your answer.

$($c$)(4$ points$)$ Assuming that the instruction sequence is executed on a five$-$stage pipelined

processor without the forwarding unit and the hazard detection unit, insert a minimum number

of NOP $($no operation$)$ instructions to ensure correct execution. $(10$ points$)$ Consider the instruction sequence below:

$ld28,4(x5)$

add $29,6,x7$

sub $30,28,29$

$sd30,0(x11)$

$($a$)(3$ points$)$ List all the data dependencies, regardless of whether they cause any hazard or not.

$($b$)(3$ points$)$ Assume that the instruction sequence is executed on a five$-$stage pipelined processor

with forwarding. Are there any hazards that will require the pipeline to stall because they

cannot be resolved by forwarding? Justify your answer.

$($c$)(4$ points$)$ Assuming that the instruction sequence is executed on a five$-$stage pipelined

processor without the forwarding unit and the hazard detection unit, insert a minimum number

of NOP $($no operation$)$ instructions to ensure correct execution.