Discussion
A high level intermediate representation, compared with a low level one,
Answer: A
Correct answer: retains more of the source structure and less machine detail
A high level representation keeps array indexing, structure references and loops as such, which suits optimisations that reason about program structure. Lowering it exposes address arithmetic and machine operations, which suits optimisations closer to the target. Neither is better in general, which is why several are used in sequence.
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