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GATE | GATE-CS-2015 (Set 1) | Question 65
A variable x is said to be live at a statement Si in a program if the following three conditions hold simultaneously:
The variables which are live both at the statement in basic block 2 and at the statement in basic block 3 of the above control flow graph are
1. There exists a statement Sj that uses x 2. There is a path from Si to Sj in the flow graph corresponding to the program 3. The path has no intervening assignment to x including at Si and Sj
The variables which are live both at the statement in basic block 2 and at the statement in basic block 3 of the above control flow graph are
(A)
p, s, u
(B)
r, s, u
(C)
r, u
(D)
q, v
Answer
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