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GATE CSE 2025 Session 1 Q13: Optimisation that uses live variable analysis

Question

Which ONE of the following techniques used in compiler code optimization uses live variable analysis?

Try it: multiple choice: exactly one correct option

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Answer: B (official GATE 2025 final answer key)

Concept used: Liveness tells which variables hold values still needed later, which drives register allocation.

First step: A register can be reused once the variable in it is dead, so register allocation needs to know where each variable is live.

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Source: official GATE 2025 Session 1 CS question paper and final answer key, organised by IIT Roorkee. Question paper · Answer key

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