Discussion
The single most productive optimisation in most compilers is generally
Answer: B
Correct answer: a combination of many modest transformations rather than any one
No single transformation dominates. The gains come from many modest ones applied together and reinforcing each other - inlining exposing constants, propagation exposing dead code, code motion exposing common subexpressions. This is also why the phase ordering problem matters so much and why any one optimisation pushed to an extreme tends to lose more than it gains.
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