Discussion
Assertion (A): Optimisation passes are often run more than once in a compiler.
Reason (R): One transformation frequently exposes opportunities that a pass which already ran would have taken.
Answer: A
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. Because transformations expose opportunities for one another, a pass that ran early may have missed work that only becomes visible later. Running the pipeline round again is the practical response to a phase ordering problem that has no optimal solution.
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