Playing by the Rules: Rewriting as a practical optimisation technique in GHC

Simon, P. J., Andrew, T., & Tony, H. (2001). Playing by the Rules: Rewriting as a practical optimisation technique in GHC: Rewriting as a practical optimisation technique in GHC. Proceedings of the 2001 Haskell Workshop.

Type

Conference paper

Intellectual base

Primary research

Year

2001

Link

https://www.microsoft.com/en-us/research/publication/playing-by-the-rules-rewriting-as-a-practical-optimisation-technique-in-ghc/

Cited by

1 citation across 1 artifact.

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Domain-specific

• Functor
  • The payoff is uniform, law-guaranteed reuse: any function a -> b is lifted to operate inside List, Maybe, Tree, or IO without unwrapping, and the two laws guarantee that lifting a composed function equals composing the lifts — so refactoring fmap g . fmap h into fmap (g . h) is provably safe and is a standard compiler and programmer optimization

    This sourceThe GHC rewrite-rules paper, in which map f (map g xs) = map (f. g) xs appears as a compiler rewrite rule, establishing the 'standard compiler optimisation' half; the paper notes GHC does not verify such rules, so the proof of safety rests on the functor laws rather than on this source.

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