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- [\#8321](https://gitlab.haskell.org//ghc/ghc/issues/8321): branch prediction for stack/heap checks for LLVM
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- [\#8279](https://gitlab.haskell.org//ghc/ghc/issues/8279): alignment and its effect on performance
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- [\#1498](https://gitlab.haskell.org//ghc/ghc/issues/1498): heap checks in recursive functions
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- [\#7367](https://gitlab.haskell.org//ghc/ghc/issues/7367): float-out causes extra allocation
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- [\#7378](https://gitlab.haskell.org//ghc/ghc/issues/7378): (a) identical-alts when the RHSs are bigger; (b) nested comparisions (cf [\#2132](https://gitlab.haskell.org//ghc/ghc/issues/2132))
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- [\#7511](https://gitlab.haskell.org//ghc/ghc/issues/7511): inlining can make programs allocate MORE!!
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- [\#7307](https://gitlab.haskell.org//ghc/ghc/issues/7307): low hanging fruit for shrinking code size for string constants and top-level indirections
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- [\#7206](https://gitlab.haskell.org//ghc/ghc/issues/7206), [\#7309](https://gitlab.haskell.org//ghc/ghc/issues/7309): avoid excessive sharing of enumerations
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- [\#10535](https://gitlab.haskell.org//ghc/ghc/issues/10535), [\#7367](https://gitlab.haskell.org//ghc/ghc/issues/7367), [\#7206](https://gitlab.haskell.org//ghc/ghc/issues/7206), [\#7309](https://gitlab.haskell.org//ghc/ghc/issues/7309): float-out and excessive sharing
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- [\#8833](https://gitlab.haskell.org//ghc/ghc/issues/8833), [\#3872](https://gitlab.haskell.org//ghc/ghc/issues/3872), [\#5400](https://gitlab.haskell.org//ghc/ghc/issues/5400), [\#5448](https://gitlab.haskell.org//ghc/ghc/issues/5448), [\#5722](https://gitlab.haskell.org//ghc/ghc/issues/5722), [\#7057](https://gitlab.haskell.org//ghc/ghc/issues/7057), [\#7369](https://gitlab.haskell.org//ghc/ghc/issues/7369), [\#9235](https://gitlab.haskell.org//ghc/ghc/issues/9235): contravariant data type loop in simplifier inliner
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- [\#5954](https://gitlab.haskell.org//ghc/ghc/issues/5954): performance regression. Duplication of primops?
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- [\#6047](https://gitlab.haskell.org//ghc/ghc/issues/6047): GHC retains unnecessary binding
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