Directed acyclic graph (DAG) of a code
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Explain, how to draw a DAG for following loop:
do i=1, 10, 1
x(i)=a(i)-b(i)
y(i)=a(i)+b(i)
d(i)=x(i)/(1+y(i))
end do
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Solution Summary
The response elaborates the process, so as to guide the reader to draw a DAG not just for the given "do ... end do" loop, but similar code as well.
Solution Preview
Following response aims at guiding you to draw a DAG not just for the given loop, but similar code as well.
Notation "A --> B" indicates that B waits for the completion of A.
For each of the 10 different values of i, loop bodies (Li) can be executed in parallel, because Li steps are a function of just "i", i.e. Li blocks executions are not ...
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