Discussion
Assertion (A): Aggressive function inlining can make a program slower.
Reason (R): The enlarged code may no longer fit in the instruction cache, so execution stalls waiting for memory.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Inlining removes call overhead and exposes context for further optimisation, but it duplicates the body at every site. Once the working set no longer fits the instruction cache, the misses cost far more than the calls saved - which is why inlining heuristics are based on size as much as on call frequency.
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