Q35

MCQ2 marks, −0.67

Consider the control flow graph given below.

Which one of the following options is the set of live variables at the exit point of each basic block?

(A)

$\mathrm{B} 1:\{\mathrm{a}, \mathrm{b}, \mathrm{c}, \mathrm{e}, \mathrm{f}\}, \mathrm{B} 2:\{\mathrm{d}, \mathrm{e}\}, \mathrm{B} 3:\{\mathrm{b}, \mathrm{c}, \mathrm{e}, \mathrm{f}\}, \mathrm{B} 4: \varnothing$

(B)

$\mathrm{B} 1$ : $\varnothing$ , $\mathrm{B} 2$ : $\{$ d, e $\}$ , $\mathrm{B} 3$ : $\{$ a, c, f $\}$ , $\mathrm{B} 4$ : $\varnothing$

(C)

$\mathrm{B} 1:\{\mathrm{a}, \mathrm{b}, \mathrm{c}, \mathrm{e}, \mathrm{f}\}, \mathrm{B} 2:\{\mathrm{d}, \mathrm{e}\}, \mathrm{B} 3:\{\mathrm{c}, \mathrm{e}, \mathrm{f}\}, \mathrm{B} 4: \varnothing$

(D)

$\mathrm{B} 1: \varnothing, \mathrm{B} 2:\{\mathrm{d}, \mathrm{e}, \mathrm{f}\}, \mathrm{B} 3:\{\mathrm{a}, \mathrm{b}, \mathrm{c}, \mathrm{e}, \mathrm{f}\}, \mathrm{B} 4: \varnothing$

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