$6\mathrm{.}9$ Consider the following three CPU organizations:

CPU SS: A two$-$core superscalar microprocessor that provides out$-$of$-$order issue

capabilities on two function units $($FUs$).$ Only a single thread can run on each core

at a time.

CPU MT: A fine$-$grained multithreaded processor that allows instructions from

two threads to be run concurrently $($i$.$e$.,$ there are two functional units$),$ though

only instructions from a single thread can be issued on any cycle.

CPU SMT: An SMT processor that allows instructions from two threads to be run

concurrently $($i$.$e$.,$ there are two functional units$),$ and instructions from either or

both threads can be issued to run on any cycle.

Assume we have two threads $x$ and $Y$ to run on these CPUs that include the

following operations:

Assume all instructions take a single cycle to execute unless noted otherwise or

they encounter a hazard.

Assume that you have one SS CPU. How many cycles will it

take to execute these two threads? How many issue slots are wasted due to hazards?

$6\mathrm{.}9\mathrm{.}2[10]$$$6\mathrm{.}4>$ Now assume you have two SS CPUs. How many cycles will it

take to execute these two threads? How many issue slots are wasted due to hazards?

Assume that you have one MT CPU. How many cycles will it

take to execute these two threads? How many issue slots are wasted due to hazards?

Assume you have one SMT CPU. How many cycles will it take

to execute the two threads? How many issue slots are wasted due to hazards?