... | ... | @@ -317,3 +317,7 @@ Random note: GHC 7.10's build system actually disabled DPH (half a dozen more pa |
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- [f53d761df9762232b54ec57a950d301011cd21f8](/trac/ghc/changeset/f53d761df9762232b54ec57a950d301011cd21f8/ghc) ("TysWiredIn: Use UniqFM lookup for built-in OccNames") improves the efficiency of built-in `OccName` lookup, resulting in a 2-5% improvement in compiler allocations on nofib. This was noticed due to unexpectedly large allocations regressions in [dd3080fe0263082f65bf2570f49189c277b12e28](/trac/ghc/changeset/dd3080fe0263082f65bf2570f49189c277b12e28/ghc) ([\#12357](https://gitlab.haskell.org//ghc/ghc/issues/12357)).
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- [ed4809813fa51524ae73a4475afe33018a67f87d](/trac/ghc/changeset/ed4809813fa51524ae73a4475afe33018a67f87d/ghc) ("InstEnv: Ensure that instance visibility check is lazy") fixes a bug introduced earlier change ([4c834fdddf4d44d12039da4d6a2c63a660975b95](/trac/ghc/changeset/4c834fdddf4d44d12039da4d6a2c63a660975b95/ghc)) in the instance visibility check which broke laziness of instance resolution. This reduces compiler allocations by roughly 5-10% on nofib. The underlying bug was noticed by unexpectedly large allocation regressions due to [673efccb3b348e9daf23d9e65460691bbea8586e](/trac/ghc/changeset/673efccb3b348e9daf23d9e65460691bbea8586e/ghc) and [4e6bcc2c8134f9c1ba7d715b3206130f23c529fb](/trac/ghc/changeset/4e6bcc2c8134f9c1ba7d715b3206130f23c529fb/ghc), which added instances to various `base` modules ([\#12367](https://gitlab.haskell.org//ghc/ghc/issues/12367)).
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- [eb3d6595735671605c5d6294a796dc0f16f784a4](/trac/ghc/changeset/eb3d6595735671605c5d6294a796dc0f16f784a4/ghc) ("OccName: Avoid re-encoding derived OccNames") is a refactoring which reduces allocations in the computation of derived `OccName`s by eliminating `String` intermediates.
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### GHC 8.2 to GHC 8.4
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- Regressions: [\#14944](https://gitlab.haskell.org//ghc/ghc/issues/14944), [\#14928](https://gitlab.haskell.org//ghc/ghc/issues/14928) |
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