GATE | GATE CS 2021 | Set 2 | Question 48

For a statement S in a program, in the context of liveness analysis, the following sets are defined:

USE(S) : the set of variables used in S
IN(S) : the set of variables that are live at the entry of S
OUT(S) : the set of variables that are live at the exit of S

Consider a basic block that consists of two statements, S1 followed by S2. Which one of the following statements is correct?

(A)

OUT(S1) = IN (S2)

(B)

OUT (S1) = IN (S1) ∪ USE (S1)

(C)

OUT (S1) = IN (S2) ∪ OUT (S2)

(D)

OUT (S1) = USE (S1) ∪ IN (S2)

Answer

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