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niteria authored
Doing canonicalization on every comparison turned out to be very expensive. Caching the canonicalization through the smart `modulePair` constructor gives `8%` reduction in allocations on `haddock.compiler` and `8.5%` reduction in allocations on `haddock.Cabal`. Possibly other things as well, but it's really visible in Haddock. Test Plan: ./validate Reviewers: jstolarek, simonpj, austin, simonmar, bgamari Reviewed By: simonpj, simonmar Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2350 GHC Trac Issues: #12191
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