Discussion
Profile guided optimisation uses
Answer: B
Correct answer: measurements from earlier runs to guide the transformations
A static heuristic can only guess which branch is taken and which loop runs hot. A profile from a representative run supplies the actual frequencies, so inlining, block layout and register allocation can all be directed at the code that matters. The weakness is that the profile must resemble real use, or the optimisation is aimed at the wrong code.
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