Q50

MCQ2 marks, −0.67

A variable $x$ is said to be live at a statement $s_{i}$ 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 $\text{p, s, u}$ $\text{r, s, u}$ $\text{r, u}$ $\text{q, v}$

(A)

There exists a statement $S_{j}$ that uses $x$

(B)

There is a path from $S_{i}$ to $S_{j}$ in the flow graph corresponding to the program

(C)

The path has no intervening assignment to $x$ including at $S_{i}$ and $S_{j}$

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