Code Generation and Optimization GATE 2015 Question #9414 with Solution

GATE 2015 · Session-1

Compiler DesignCode Generation and OptimizationhardMCQ2 marks

Consider the following control-flow fragment and standard live-variable analysis.

text

B1: if condition goto B2 else goto B3
B2: v = r + u
    s = 0
    goto B4
B3: q = r - u
    s = 1
    goto B4

Which variables are live at the exit of basic block B1?

Ar and uBr, s, and uCq, r, and uDr, u, and v

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