John Regehr • 11/1/2023

Why Do Peephole Optimizations Work?

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This technical article delves into peephole optimizations in modern compilers, explaining their transition from localized instruction sequences to SSA-based IRs like LLVM. It discusses the correctness criteria for such optimizations, arguing for refinement—making code more specific—rather than strict behavioral equivalence, and uses De Morgan's law as a concrete example.

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#compiler optimization #Intermediate Representation #Llvm Ir
Why Do Peephole Optimizations Work?

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