Discussion
Grouping several phases into one pass is done chiefly to
Answer: A
Correct answer: reduce the input and output cost of writing intermediate forms
Each pass boundary means writing a representation out and reading it back, which historically dominated compilation time on machines with little memory.
Folding phases together lets one phase's output be handed directly to the next, often a token or a tree node at a time. The constraint is the language: a single pass requires that everything needed be known when it is first encountered, which is why declaration-before-use rules make single-pass compilation feasible.
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