Simon Peyton Jones pushed to branch wip/T26868 at Glasgow Haskell Compiler / GHC Commits: de54e264 by Cheng Shao at 2026-03-21T17:52:08+01:00 rts: fix -Wcompare-distinct-pointer-types errors This commit fixes `-Wcompare-distinct-pointer-types` errors in the RTS which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. - - - - - b9bd73de by Cheng Shao at 2026-03-21T17:52:08+01:00 ghc-internal: fix unused imports This commit fixes unused imports in `ghc-internal` which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. Fixes #26987 #27059. - - - - - da946a16 by Cheng Shao at 2026-03-21T17:03:51+00:00 ghci: fix unused imports This commit fixes unused imports in `ghci` which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. Fixes #26987 #27059. - - - - - 955b1cf8 by Cheng Shao at 2026-03-21T17:03:51+00:00 compiler: fix unused imports in GHC.Tc.Types.Origin This commit fixes unused imports in `GHC.Tc.Types.Origin` which should have been caught by the `validate` flavour but was warnings in CI due to the recent `+werror` regression. Fixes #27059. - - - - - 3b1aeb50 by Cheng Shao at 2026-03-21T17:03:51+00:00 hadrian: fix missing +werror in validate flavour This patch fixes missing `+werror` in validate flavour, which was an oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066. - - - - - 44f118f0 by Cheng Shao at 2026-03-22T04:54:01-04:00 ci: bump CACHE_REV and add the missing reminder This patch bumps `CACHE_REV` to address recent `[Cabal-7159]` CI errors due to stale cabal cache on some runners, and also adds a reminder to remind future maintainers. Fixes #27075. - - - - - 2a218737 by ARATA Mizuki at 2026-03-23T11:11:39-04:00 Add 128-bit SIMD support to AArch64 NCG Changes: - Add `Format` field to vector-capable instructions. These instructions will emit `vN.4s` (for example) as a operand. - Additional constructors for `Operand`: `OpVecLane` represents a vector lane and will be emitted as `vN.<width>[<index>]` (`vN.s[3]` for example). `OpScalarAsVec` represents a scalar, but printed as a vector lane like `vN.<width>[0]` (`vN.s[0]` for example). - Integer quot/rem are implemented in C, like x86. Closes #26536 Metric Increase: T3294 - - - - - 5d6e2be9 by ARATA Mizuki at 2026-03-23T11:11:39-04:00 AArch64 NCG: Improve code generation for floating-point and vector constants Some floating-point constants can be directly encoded using the FMOV instruction. Similarly, a class of vectors with same values can be encoded using FMOV, MOVI, or MVNI. - - - - - c6d262aa by Simon Jakobi at 2026-03-23T11:12:22-04:00 Add regression test for #13729 Closes #13729. - - - - - 6487fd90 by Simon Peyton Jones at 2026-03-24T15:49:35+00:00 Add Invariant (NoTypeShadowing) to Core This commit addresses #26868, by adding a new invariant (NoTypeShadowing) to Core. See Note [No type-shadowing in Core] in GHC.Core - - - - - 92c5ae02 by Simon Peyton Jones at 2026-03-24T15:49:35+00:00 Major refactor of free-variable functions For some time we have had two free-variable mechanims for types: * The "FV" mechanism, embodied in GHC.Utils.FV, which worked OK, but was fragile where eta-expansion was concerned. * The TyCoFolder mechanism, using a one-shot EndoOS accumulator I finally got tired of this and refactored the whole thing, thereby addressing #27080. Now we have * `GHC.Types.Var.FV`, which has a composable free-variable result type, very much in the spirit of the old `FV`, but much more robust. (It uses the "one shot trick".) * GHC.Core.TyCo.FVs now has just one technology for free variables. All this led to a lot of renaming. - - - - - 138 changed files: - .gitlab-ci.yml - compiler/CodeGen.Platform.h - compiler/GHC/CmmToAsm/AArch64/CodeGen.hs - compiler/GHC/CmmToAsm/AArch64/Instr.hs - compiler/GHC/CmmToAsm/AArch64/Ppr.hs - compiler/GHC/CmmToAsm/AArch64/Regs.hs - compiler/GHC/CmmToAsm/Reg/Graph/TrivColorable.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCo/Subst.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Driver/Config/StgToCmm.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Rename/Bind.hs - compiler/GHC/Rename/Env.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/Expr.hs-boot - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Lit.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Rename/Splice.hs - compiler/GHC/Rename/Splice.hs-boot - compiler/GHC/Rename/Utils.hs - compiler/GHC/Tc/Deriv.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Hole.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Instance/Family.hs - compiler/GHC/Tc/Instance/FunDeps.hs - compiler/GHC/Tc/Module.hs - compiler/GHC/Tc/TyCl/Utils.hs - compiler/GHC/Tc/Types/Constraint.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Validity.hs - compiler/GHC/Types/Name/Set.hs - + compiler/GHC/Types/Var/FV.hs - compiler/GHC/Types/Var/Set.hs - compiler/GHC/Utils/EndoOS.hs - − compiler/GHC/Utils/FV.hs - compiler/ghc.cabal.in - docs/users_guide/9.16.1-notes.rst - hadrian/cabal.project - hadrian/src/Settings/Flavours/Validate.hs - libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs - libraries/ghc-internal/src/GHC/Internal/Event/Control.hs - libraries/ghc-internal/src/GHC/Internal/Event/KQueue.hsc - libraries/ghc-internal/src/GHC/Internal/Float.hs - libraries/ghc-internal/src/GHC/Internal/Float/RealFracMethods.hs - libraries/ghc-internal/src/GHC/Internal/IO/FD.hs - libraries/ghc-internal/src/GHC/Internal/Int.hs - libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc - libraries/ghc-internal/src/GHC/Internal/RTS/Flags/Test.hsc - libraries/ghc-internal/src/GHC/Internal/System/Environment.hs - libraries/ghc-internal/src/GHC/Internal/System/Environment/Blank.hsc - libraries/ghc-internal/src/GHC/Internal/System/IO.hs - libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs - libraries/ghc-internal/src/GHC/Internal/TopHandler.hs - libraries/ghci/GHCi/Message.hs - libraries/ghci/GHCi/Server.hs - rts/Interpreter.c - rts/include/stg/Prim.h - rts/prim/vectorQuotRem.c - testsuite/tests/count-deps/CountDepsAst.stdout - testsuite/tests/count-deps/CountDepsParser.stdout - testsuite/tests/cpranal/should_compile/T18401.stderr - testsuite/tests/deriving/should_fail/deriving-via-fail4.stderr - + testsuite/tests/driver/T13729/A/A.cabal - + testsuite/tests/driver/T13729/A/Setup.hs - + testsuite/tests/driver/T13729/A/TH.hs - + testsuite/tests/driver/T13729/A/Types1.hs - + testsuite/tests/driver/T13729/A/Types2.hs - + testsuite/tests/driver/T13729/B/B.cabal - + testsuite/tests/driver/T13729/B/Main.hs - + testsuite/tests/driver/T13729/B/Setup.hs - + testsuite/tests/driver/T13729/Makefile - + testsuite/tests/driver/T13729/Setup.hs - + testsuite/tests/driver/T13729/all.T - testsuite/tests/indexed-types/should_fail/T2693.stderr - testsuite/tests/partial-sigs/should_compile/T10403.stderr - testsuite/tests/partial-sigs/should_compile/T12844.stderr - testsuite/tests/partial-sigs/should_compile/T15039a.stderr - testsuite/tests/partial-sigs/should_compile/T15039b.stderr - 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utils/haddock/haddock-api/src/Haddock/GhcUtils.hs The diff was not included because it is too large. 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