this post was submitted on 20 Mar 2024
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The Haskell Unfolder Episode 22: foldr-build fusion (well-typed.com)
submitted 6 months ago by [email protected] to c/[email protected]
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When composing several list-processing functions, GHC employs an optimisation called foldr-build fusion. Fusion combines functions in such a way that any intermediate lists can often be eliminated completely. In this episode, we will look at how this optimisation works, and at how it is implemented in GHC: not as built-in compiler magic, but rather via user-definable rewrite rules.

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