[Git][ghc/ghc][wip/spj-reinstallable-base2] 2 commits: Major patch to re-engineer known-key names

Rodrigo Mesquita pushed to branch wip/spj-reinstallable-base2 at Glasgow Haskell Compiler / GHC Commits: 630980bf by Simon Peyton Jones at 2026-07-01T19:08:38+01:00 Major patch to re-engineer known-key names This big patch implements the New Plan for known-key names, described in #27013. Read the big Note [Overview of known-key names] in GHC.Types.Name Some things had to be reworked slightly to accomodate the new known-keys design. A significant one was the generation of auxiliary KindRep bindings, which was greatly simplified. Note [Grand plan for Typeable] was updated accordingly. Another example: GHC.Internal.CString was merged into GHC.Internal.Types. Co-authored-by: Rodrigo Mesquita The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed All performance regressions were investigated in depth. - Tests that regress in allocations +-1MB are attributed to loading an additional interface and associated Names for GHC.Essentials. - InstanceMatching allocates more decoding Symbol Tables from interface files, but I couldn't attribute the regression cause to this patch; accept after finding a 10% improvement merged in 274634267f7ac8ccecbb425ab3fd340c17db6cab. - MultiComponentModules100, MultiComponentModulesRecomp100, MultiComponentModulesRecomp regresses because existing bugs that make an additional implicit edge do too much redundant work: #27053 and #27461 Missing: T18140, T18282, T18698a, T18698b, T21839c, T5030 ------------------------- Metric Decrease: MultiLayerModules T13701 T14697 hard_hole_fits mhu-perf size_hello_obj Metric Increase: InstanceMatching MultiComponentModules100 MultiComponentModulesRecomp100 MultiComponentModulesRecomp T10547 T9198 T18923 T13820 T13035 T12234 T12425 T18730 T20049 ------------------------- - - - - - e9597d1e by Rodrigo Mesquita at 2026-07-01T19:12:19+01:00 loopImports: Don't dup ms_uid in summary imports We were writing the ms_unitid of the mod summary with every single import of that module That complicated the code (as though the UnitId in that list could ever be something else) and also allocates unnecessarily per every mod import. Very slight allocation decrease measured locally in a few tests: (MultiComponentModulesRecomp: -0.06%; MultiComponentModulesRecomp100: -0.05%) Purely a clean up. - - - - - 706 changed files: - + changelog.d/refactor-known-names - compiler/GHC.hs - + compiler/GHC/Builtin.hs - + compiler/GHC/Builtin/KnownKeys.hs - + compiler/GHC/Builtin/KnownOccs.hs - + compiler/GHC/Builtin/Modules.hs - − compiler/GHC/Builtin/Names.hs - − compiler/GHC/Builtin/Names/TH.hs - compiler/GHC/Builtin/PrimOps.hs - compiler/GHC/Builtin/PrimOps/Casts.hs - compiler/GHC/Builtin/PrimOps/Ids.hs - + compiler/GHC/Builtin/TH.hs - compiler/GHC/Builtin/Uniques.hs - compiler/GHC/Builtin/Uniques.hs-boot - − compiler/GHC/Builtin/Utils.hs - + compiler/GHC/Builtin/WiredIn/Ids.hs - compiler/GHC/Builtin/Types/Prim.hs → compiler/GHC/Builtin/WiredIn/Prim.hs - compiler/GHC/Builtin/Types/Literals.hs → compiler/GHC/Builtin/WiredIn/TypeLits.hs - compiler/GHC/Builtin/Types.hs → compiler/GHC/Builtin/WiredIn/Types.hs - compiler/GHC/Builtin/Types.hs-boot → compiler/GHC/Builtin/WiredIn/Types.hs-boot - 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utils/genprimopcode/Main.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.hs - utils/haddock/haddock-api/src/Haddock/Interface.hs - utils/haddock/haddock-api/src/Haddock/Interface/AttachInstances.hs - utils/haddock/haddock-api/src/Haddock/Interface/Create.hs - utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs - utils/haddock/haddock-api/src/Haddock/Types.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/56e70a3c59b10d3457de843e19ffdfc... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/56e70a3c59b10d3457de843e19ffdfc... You're receiving this email because of your account on gitlab.haskell.org.