$[50$ points$]$ Given the following code segments, what results of $($u$,$ v$,$ w$,$ x$)$ are possible and

impossible by the end of this code segments under sequential consistency $($SC$)?$ For each

possible result, show one statement interleaving that can produce the result; and for each

impossible result, explain why it is an impossible result. Assume that all variables are

initialized to $0$ before this code is reached. Note: there are $16$ results for $($u$,$ v$,$ w$,$ x$).$

P$1$ P$2$ P$3$

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$(1$a$)$ A $=2(2$a$)$ u $=$ B $(3$a$)$ w $=$ A

$(1$b$)$ B $=5(2$b$)$ v $=$ A $(3$b$)$ x $=$ B$[50$ points$]$ Given the following code segments, what results of $(u,v,w,x)$ are possible and

impossible by the end of this code segments under sequential consistency $($SC$)?$ For each

possible result, show one statement interleaving that can produce the result; and for each

impossible result, explain why it is an impossible result. Assume that all variables are

initialized to $0$ before this code is reached. Note: there are $16$ results for $(u,v,w,x).$