Discussion
A compiler pass that reads the intermediate code and writes improved intermediate code is
Answer: B
Correct answer: an optimisation pass operating within the middle of the compiler
Reading intermediate code and writing intermediate code is the signature of an optimisation pass: the representation is unchanged and only the quality of the program improves.
Such passes are typically run several times and in sequence, since one transformation exposes opportunities for another. They sit between the front and back ends, so they are neither the last pass before the executable nor part of lexical analysis, and they have nothing to do with the assembler.
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