Are you able to predict with 100% accuracy when a loop will successfully unroll, or various interprocedural or intraprocedural analyses will succeed? They are applied deterministically inside a compiler, but often based on heuristics, and the complex interplay of optimizations in complex programs means that sometimes they will not do what you expect them to do. Sometimes they work better than expected, and sometimes worse. Sounds familiar...
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Are you able to predict with 100% accuracy when a loop will successfully unroll, or various interprocedural or intraprocedural analyses will succeed? They are applied deterministically inside a compiler, but often based on heuristics, and the complex interplay of optimizations in complex programs means that sometimes they will not do what you expect them to do. Sometimes they work better than expected, and sometimes worse. Sounds familiar...