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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 5 commits: Major patch to re-engineer known-key names
by Marge Bot (＠marge-bot) 14 Aug '26

14 Aug '26

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: e4cfaaa0 by Simon Peyton Jones at 2026-08-14T01:09:32+02:00 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 <rodrigo.m.mesquita(a)gmail.com> The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed Metrics: compile_time/bytes allocated ------------------------------------- Baseline Test Metric value New value Change ------------------------------------------------------------------------------------------ MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD geo. mean +0.1% minimum -8.0% maximum +5.4% All performance regressions were investigated in depth. The surviving ones: - MultiComponentModules100, MultiComponentModulesRecomp100, MultiComponentModulesRecomp regresses because existing bugs that make an additional implicit edge do too much redundant work: #27053 and #27461 - T13820, T18140, T10547, T13035 regress because we load an additional interface and associated Names for GHC.Essentials. ------------------------- Metric Decrease: MultiLayerModules T13379 T13701 T14697 T26989 T4801 T783 T9961 hard_hole_fits mhu-perf size_hello_artifact size_hello_obj size_hello_unicode Metric Increase: LinkableUsage01 LinkableUsage02 MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 T10547 T13035 T13820 T18140 T18698a T18698b T20049 ------------------------- Bumps submodule binary Closes #27013 - - - - - 61665e79 by sheaf at 2026-08-14T01:09:33+02:00 Allow GHC.Essentials to be hidden This commit overhauls several aspects of the known entity handling, in order to allow GHC.Essentials to be hidden without a proliferation of special cases in the compiler. The main contribution is to introduce the 'UnresolvedImport' datatype which cleans up a lot of ad-hoc handling relating to 'ModSummary', fixing #27603. This allows us to reduce duplication, e.g. by having Backpack reuse 'mkUnresolvedImports' instead of replicating the "add implicit imports" logic. It also makes it easier to avoid undesirable edge cases (such as making sure that the Template Haskell 'reifyModule' function does not leak the implicit GHC.Essentials import). In particular, the infamous 'findImportedModuleWithIsBoot' is now simply 'resolveImport', taking a single 'UnresolvedImport' and resolving it to a 'FindResult' (usually a 'Module'). Other changes: - Cache the result of looking up GHC.Essentials (in TcM and DsM environments) to avoid redundant work. This reduces allocations on LinkableUsage01 and hard_hole_fits. - Properly look up known entities for StaticPointers like we do for other known entities everywhere else. This allows e.g. modules in ghc-internal to use -XStaticPointers. - When using multiple home units, we are now careful to handle the situation in which we may have multiple GHC.Essentials modules around. See the new tests under 'driver/multipleHomeUnits'. - - - - - d6a9e608 by Vladislav Zavialov at 2026-08-14T02:15:08-04:00 Increase test coverage of diagnostics, batch 2 Add test cases for the previously untested diagnostics: [GHC-26133] TcRnForeignImportPrimSafeAnn [GHC-68444] SumAltArityExceeded [GHC-63966] IllegalSumAlt [GHC-23882] IllegalDeclaration [GHC-60220] InvalidCCallImpent [GHC-18816] RecGadtNoCons [GHC-38140] GadtNoCons [GHC-37056] InvalidTypeInstanceHeader [GHC-78486] InvalidTyFamInstLHS [GHC-39639] DefaultDataInstDecl [GHC-78822] AssocDefaultNotAssoc [GHC-43510] NotSimpleUnliftedType [GHC-41843] IOResultExpected [GHC-07641] AtLeastOneArgExpected [GHC-52886] InvalidTopDecl Remove unused error constructors: [GHC-92057] ImportLookupAmbiguous - - - - - 8453a936 by Simon Jakobi at 2026-08-14T02:15:10-04:00 testsuite: Drop peak_megabytes_allocated from LinkableUsage tests LinkableUsage01/02 collected all metrics with a 2% tolerance. For peak_megabytes_allocated, whose granularity is 1 MB, that window is under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the test (#27613, #27489). Drop that metric: max_bytes_used guards the Linkable-retention property with byte granularity, at a tolerance that still comfortably exceeds the noise observed in CI. Assisted-by: Claude Fable 5 - - - - - 1acd10f4 by Simon Jakobi at 2026-08-14T02:15:10-04:00 testsuite: Don't truncate fractional baselines when computing bounds RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with int() before applying the tolerance. Baselines can be fractional (they are averaged over several measurements), so this skewed the acceptance window downwards: in #27613, a baseline of 33.67 at 2% tolerance yielded bounds (32, 34) instead of (32, 35), rejecting a measurement that was within tolerance. Assisted-by: Claude Fable 5 - - - - - 827 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 - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/LiberateCase.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/SpecConstr.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Core/Utils.hs - 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docs/users_guide/separate_compilation.rst - ghc/GHCi/UI.hs - ghc/GHCi/UI/Monad.hs - ghc/Main.hs - libraries/base/base.cabal.in - libraries/base/src/Control/Applicative.hs - libraries/base/src/Control/Concurrent.hs - libraries/base/src/Control/Concurrent/Chan.hs - libraries/base/src/Control/Concurrent/QSem.hs - libraries/base/src/Control/Concurrent/QSemN.hs - libraries/base/src/Data/Array/Byte.hs - libraries/base/src/Data/Bifoldable.hs - libraries/base/src/Data/Bifoldable1.hs - libraries/base/src/Data/Bifunctor.hs - libraries/base/src/Data/Bitraversable.hs - libraries/base/src/Data/Bool.hs - libraries/base/src/Data/Complex.hs - libraries/base/src/Data/Data.hs - libraries/base/src/Data/Enum.hs - libraries/base/src/Data/Fixed.hs - libraries/base/src/Data/Foldable1.hs - libraries/base/src/Data/Functor/Classes.hs - libraries/base/src/Data/Functor/Compose.hs - libraries/base/src/Data/Functor/Contravariant.hs - libraries/base/src/Data/Functor/Product.hs - libraries/base/src/Data/Functor/Sum.hs - libraries/base/src/Data/List.hs - libraries/base/src/Data/List/NonEmpty.hs - libraries/base/src/Data/List/NubOrdSet.hs - libraries/base/src/Data/Semigroup.hs - libraries/base/src/Data/Version.hs - libraries/base/src/GHC/Base.hs - libraries/base/src/GHC/ByteOrder.hs - + libraries/base/src/GHC/Essentials.hs - libraries/base/src/GHC/Exts.hs - libraries/base/src/GHC/Fingerprint.hs - libraries/base/src/GHC/RTS/Flags.hs - libraries/base/src/GHC/ResponseFile.hs - libraries/base/src/GHC/Stats.hs - libraries/base/src/GHC/Weak/Finalize.hs - libraries/base/src/Numeric.hs - libraries/base/src/Prelude.hs - libraries/base/src/System/CPUTime/Posix/ClockGetTime.hsc - libraries/base/src/System/CPUTime/Posix/RUsage.hsc - libraries/base/src/System/CPUTime/Posix/Times.hsc - libraries/base/src/System/CPUTime/Unsupported.hs - libraries/base/src/System/Console/GetOpt.hs - libraries/base/src/System/Exit.hs - libraries/base/src/System/IO.hs - libraries/base/src/System/IO/OS.hs - libraries/base/src/System/IO/Unsafe.hs - libraries/base/src/System/Info.hs - libraries/base/src/System/Timeout.hs - libraries/base/src/Text/Printf.hs - libraries/base/src/Text/Read.hs - libraries/base/src/Text/Show/Functions.hs - libraries/binary - libraries/ghc-experimental/src/Data/Sum/Experimental.hs - libraries/ghc-experimental/src/Data/Tuple/Experimental.hs - libraries/ghc-experimental/src/GHC/Profiling/Eras.hs - libraries/ghc-experimental/src/Prelude/Experimental.hs - libraries/ghc-internal/codepages/MakeTable.hs - libraries/ghc-internal/ghc-internal.cabal.in - libraries/ghc-internal/include/RtsIfaceSymbols.h - libraries/ghc-internal/src/GHC/Internal/AllocationLimitHandler.hs - libraries/ghc-internal/src/GHC/Internal/Arr.hs - libraries/ghc-internal/src/GHC/Internal/ArrayArray.hs - libraries/ghc-internal/src/GHC/Internal/Base.hs - libraries/ghc-internal/src/GHC/Internal/Bignum/Backend.hs - libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/GMP.hs - libraries/ghc-internal/src/GHC/Internal/Bignum/Backend/Native.hs - libraries/ghc-internal/src/GHC/Internal/Bignum/BigNat.hs - 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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/87d8f1374fbcab2296856715442c5d… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/87d8f1374fbcab2296856715442c5d… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 3 commits: Increase test coverage of diagnostics, batch 2
by Marge Bot (＠marge-bot) 14 Aug '26

14 Aug '26

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: d87b651f by Vladislav Zavialov at 2026-08-13T19:56:06-04:00 Increase test coverage of diagnostics, batch 2 Add test cases for the previously untested diagnostics: [GHC-26133] TcRnForeignImportPrimSafeAnn [GHC-68444] SumAltArityExceeded [GHC-63966] IllegalSumAlt [GHC-23882] IllegalDeclaration [GHC-60220] InvalidCCallImpent [GHC-18816] RecGadtNoCons [GHC-38140] GadtNoCons [GHC-37056] InvalidTypeInstanceHeader [GHC-78486] InvalidTyFamInstLHS [GHC-39639] DefaultDataInstDecl [GHC-78822] AssocDefaultNotAssoc [GHC-43510] NotSimpleUnliftedType [GHC-41843] IOResultExpected [GHC-07641] AtLeastOneArgExpected [GHC-52886] InvalidTopDecl Remove unused error constructors: [GHC-92057] ImportLookupAmbiguous - - - - - d27b2159 by Simon Jakobi at 2026-08-13T19:56:07-04:00 testsuite: Drop peak_megabytes_allocated from LinkableUsage tests LinkableUsage01/02 collected all metrics with a 2% tolerance. For peak_megabytes_allocated, whose granularity is 1 MB, that window is under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the test (#27613, #27489). Drop that metric: max_bytes_used guards the Linkable-retention property with byte granularity, at a tolerance that still comfortably exceeds the noise observed in CI. Assisted-by: Claude Fable 5 - - - - - 87d8f137 by Simon Jakobi at 2026-08-13T19:56:07-04:00 testsuite: Don't truncate fractional baselines when computing bounds RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with int() before applying the tolerance. Baselines can be fractional (they are averaged over several measurements), so this skewed the acceptance window downwards: in #27613, a baseline of 33.67 at 2% tolerance yielded bounds (32, 34) instead of (32, 35), rejecting a measurement that was within tolerance. Assisted-by: Claude Fable 5 - - - - - 38 changed files: - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Types/Error/Codes.hs - testsuite/driver/perf_notes.py - testsuite/tests/bytecode/TLinkable/all.T - testsuite/tests/diagnostic-codes/codes.stdout - testsuite/tests/ffi/should_fail/all.T - + testsuite/tests/ffi/should_fail/ccfail006.hs - + testsuite/tests/ffi/should_fail/ccfail006.stderr - + testsuite/tests/ffi/should_fail/ccfail007.hs - + testsuite/tests/ffi/should_fail/ccfail007.stderr - + testsuite/tests/ffi/should_fail/ccfail008.hs - + testsuite/tests/ffi/should_fail/ccfail008.stderr - + testsuite/tests/ffi/should_fail/ccfail009.hs - + testsuite/tests/ffi/should_fail/ccfail009.stderr - + testsuite/tests/th/AssocDefaultNotAssoc.hs - + testsuite/tests/th/AssocDefaultNotAssoc.stderr - + testsuite/tests/th/TH_InvalidTopDecl.hs - + testsuite/tests/th/TH_InvalidTopDecl.stderr - + testsuite/tests/th/TH_cvt_DefaultDataInstDecl.hs - + testsuite/tests/th/TH_cvt_DefaultDataInstDecl.stderr - + testsuite/tests/th/TH_cvt_GadtNoCons.hs - + testsuite/tests/th/TH_cvt_GadtNoCons.stderr - + testsuite/tests/th/TH_cvt_IllegalDeclaration.hs - + testsuite/tests/th/TH_cvt_IllegalDeclaration.stderr - + testsuite/tests/th/TH_cvt_IllegalSumAlt.hs - + testsuite/tests/th/TH_cvt_IllegalSumAlt.stderr - + testsuite/tests/th/TH_cvt_InvalidCCallImpent.hs - + testsuite/tests/th/TH_cvt_InvalidCCallImpent.stderr - + testsuite/tests/th/TH_cvt_InvalidTyFamInstLHS.hs - + testsuite/tests/th/TH_cvt_InvalidTyFamInstLHS.stderr - + testsuite/tests/th/TH_cvt_InvalidTypeInstanceHeader.hs - + testsuite/tests/th/TH_cvt_InvalidTypeInstanceHeader.stderr - + testsuite/tests/th/TH_cvt_RecGadtNoCons.hs - + testsuite/tests/th/TH_cvt_RecGadtNoCons.stderr - + testsuite/tests/th/TH_cvt_SumAltArityExceeded.hs - + testsuite/tests/th/TH_cvt_SumAltArityExceeded.stderr - testsuite/tests/th/all.T The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e98231d74960c1bc8f7799cb026487… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e98231d74960c1bc8f7799cb026487… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/spj-reinstallable-base2] 2 commits: Major patch to re-engineer known-key names
by sheaf (＠sheaf) 14 Aug '26

14 Aug '26

sheaf pushed to branch wip/spj-reinstallable-base2 at Glasgow Haskell Compiler / GHC Commits: e4cfaaa0 by Simon Peyton Jones at 2026-08-14T01:09:32+02:00 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 <rodrigo.m.mesquita(a)gmail.com> The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed Metrics: compile_time/bytes allocated ------------------------------------- Baseline Test Metric value New value Change ------------------------------------------------------------------------------------------ MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD geo. mean +0.1% minimum -8.0% maximum +5.4% All performance regressions were investigated in depth. The surviving ones: - MultiComponentModules100, MultiComponentModulesRecomp100, MultiComponentModulesRecomp regresses because existing bugs that make an additional implicit edge do too much redundant work: #27053 and #27461 - T13820, T18140, T10547, T13035 regress because we load an additional interface and associated Names for GHC.Essentials. ------------------------- Metric Decrease: MultiLayerModules T13379 T13701 T14697 T26989 T4801 T783 T9961 hard_hole_fits mhu-perf size_hello_artifact size_hello_obj size_hello_unicode Metric Increase: LinkableUsage01 LinkableUsage02 MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 T10547 T13035 T13820 T18140 T18698a T18698b T20049 ------------------------- Bumps submodule binary Closes #27013 - - - - - 61665e79 by sheaf at 2026-08-14T01:09:33+02:00 Allow GHC.Essentials to be hidden This commit overhauls several aspects of the known entity handling, in order to allow GHC.Essentials to be hidden without a proliferation of special cases in the compiler. The main contribution is to introduce the 'UnresolvedImport' datatype which cleans up a lot of ad-hoc handling relating to 'ModSummary', fixing #27603. This allows us to reduce duplication, e.g. by having Backpack reuse 'mkUnresolvedImports' instead of replicating the "add implicit imports" logic. It also makes it easier to avoid undesirable edge cases (such as making sure that the Template Haskell 'reifyModule' function does not leak the implicit GHC.Essentials import). In particular, the infamous 'findImportedModuleWithIsBoot' is now simply 'resolveImport', taking a single 'UnresolvedImport' and resolving it to a 'FindResult' (usually a 'Module'). Other changes: - Cache the result of looking up GHC.Essentials (in TcM and DsM environments) to avoid redundant work. This reduces allocations on LinkableUsage01 and hard_hole_fits. - Properly look up known entities for StaticPointers like we do for other known entities everywhere else. This allows e.g. modules in ghc-internal to use -XStaticPointers. - When using multiple home units, we are now careful to handle the situation in which we may have multiple GHC.Essentials modules around. See the new tests under 'driver/multipleHomeUnits'. - - - - - 793 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 - compiler/GHC/ByteCode/Asm.hs - compiler/GHC/Core.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FVs.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/Lint.hs - compiler/GHC/Core/Make.hs - compiler/GHC/Core/Multiplicity.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/ConstantFold.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/LiberateCase.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Simplify/Env.hs - compiler/GHC/Core/Opt/Simplify/Iteration.hs - compiler/GHC/Core/Opt/SpecConstr.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Ppr.hs - compiler/GHC/Core/Predicate.hs - compiler/GHC/Core/Rules.hs - compiler/GHC/Core/SimpleOpt.hs - compiler/GHC/Core/Subst.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Core/Type.hs - compiler/GHC/Core/Unfold.hs - compiler/GHC/Core/Unify.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToIface.hs - compiler/GHC/CoreToStg.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Backpack.hs - compiler/GHC/Driver/Config/Tidy.hs - compiler/GHC/Driver/Downsweep.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Env.hs - compiler/GHC/Driver/Env/KnotVars.hs - compiler/GHC/Driver/Env/Types.hs - compiler/GHC/Driver/Flags.hs - compiler/GHC/Driver/Main/Hsc.hs - compiler/GHC/Driver/Main/Passes.hs - compiler/GHC/Driver/Make.hs - compiler/GHC/Driver/MakeFile.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Plugins.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/ImpExp.hs - compiler/GHC/Hs/Lit.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Syn/Type.hs - compiler/GHC/Hs/Type.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore.hs - compiler/GHC/HsToCore/Arrows.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/C.hs - compiler/GHC/HsToCore/Foreign/Call.hs - compiler/GHC/HsToCore/Foreign/JavaScript.hs - compiler/GHC/HsToCore/Foreign/Utils.hs - compiler/GHC/HsToCore/Foreign/Wasm.hs - compiler/GHC/HsToCore/ListComp.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Pmc/Check.hs - compiler/GHC/HsToCore/Pmc/Desugar.hs - compiler/GHC/HsToCore/Pmc/Ppr.hs - compiler/GHC/HsToCore/Pmc/Solver.hs - compiler/GHC/HsToCore/Pmc/Solver/Types.hs - compiler/GHC/HsToCore/Quote.hs - compiler/GHC/HsToCore/Types.hs - compiler/GHC/HsToCore/Usage.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Iface/Binary.hs - compiler/GHC/Iface/Env.hs - − compiler/GHC/Iface/Env.hs-boot - compiler/GHC/Iface/Errors/Ppr.hs - compiler/GHC/Iface/Errors/Types.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Load.hs - compiler/GHC/Iface/Make.hs - compiler/GHC/Iface/Recomp.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/Iface/Type.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/Errors/Ppr.hs - compiler/GHC/Parser/Header.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Plugins.hs - compiler/GHC/Rename/Env.hs - compiler/GHC/Rename/Expr.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Lit.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/Rename/Names.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Rename/Splice.hs - compiler/GHC/Rename/Unbound.hs - compiler/GHC/Rename/Utils.hs - compiler/GHC/Runtime/Context.hs - compiler/GHC/Runtime/Debugger.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/Runtime/Heap/Inspect.hs - compiler/GHC/Runtime/Interpreter.hs - compiler/GHC/Runtime/Loader.hs - compiler/GHC/Stg/BcPrep.hs - compiler/GHC/Stg/Unarise.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToCmm/Bind.hs - compiler/GHC/StgToCmm/DataCon.hs - compiler/GHC/StgToCmm/Env.hs - compiler/GHC/StgToCmm/Foreign.hs - compiler/GHC/StgToCmm/Lit.hs - compiler/GHC/StgToCmm/Ticky.hs - compiler/GHC/StgToJS/Apply.hs - compiler/GHC/StgToJS/Arg.hs - compiler/GHC/StgToJS/Expr.hs - compiler/GHC/StgToJS/FFI.hs - compiler/GHC/StgToJS/Linker/Utils.hs - compiler/GHC/StgToJS/Utils.hs - compiler/GHC/Tc/Deriv.hs - compiler/GHC/Tc/Deriv/Functor.hs - compiler/GHC/Tc/Deriv/Generate.hs - compiler/GHC/Tc/Deriv/Generics.hs - compiler/GHC/Tc/Deriv/Infer.hs - compiler/GHC/Tc/Deriv/Utils.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Hole.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Arrow.hs - compiler/GHC/Tc/Gen/Bind.hs - compiler/GHC/Tc/Gen/Default.hs - compiler/GHC/Tc/Gen/Export.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/Foreign.hs - compiler/GHC/Tc/Gen/Head.hs - compiler/GHC/Tc/Gen/HsType.hs - compiler/GHC/Tc/Gen/Match.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Gen/Splice.hs - compiler/GHC/Tc/Instance/Class.hs - compiler/GHC/Tc/Instance/FunDeps.hs - compiler/GHC/Tc/Instance/Typeable.hs - 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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/2a793bffcbcec0626bbedeb0c14b14… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/2a793bffcbcec0626bbedeb0c14b14… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/spj-reinstallable-base2] 11 commits: hie.yaml: use a polyglot shell/batch script
by sheaf (＠sheaf) 14 Aug '26

14 Aug '26

sheaf pushed to branch wip/spj-reinstallable-base2 at Glasgow Haskell Compiler / GHC Commits: 9df24b7e by sheaf at 2026-08-10T14:28:30-04:00 hie.yaml: use a polyglot shell/batch script This commit merges hie-bios and hie-bios.bat into a single polyglot script. This avoids Windows users having to manually update hie.yaml in order to be able to use HLS. - - - - - 7f75c588 by Alan Zimmerman at 2026-08-10T14:29:11-04:00 EPA: Remove type parameter from AnnList This is a step towards cutting AnnList down to its core for formatting lists only - - - - - e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00 driver: Link object files in a deterministic order The object files handed to the linker come from the HomePackageTable, which is ordered by the order in which modules finished compiling. With -j1 that is the build plan order, with -jN it is whatever the scheduler produced, so the same sources can link to different (but equivalent) binaries. The order reaches the output: .text and .rodata contributions are concatenated in link order, so e.g. building the hdav executable of the DAV package twice, once with -j1 and once with -j4, yields two binaries that differ in ~100kB of section contents. Sort the home modules by module before collecting their linkables, guarded under `Opt_ObjectDeterminism` . Fixes #27612 Signed-off-by: Bernhard M. Wiedemann <bwiedemann(a)suse.de> - - - - - 556db2f3 by sheaf at 2026-08-10T21:32:06-04:00 Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite As remarked in #27628, this module currently sits on a knife's edge: if the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then SpecConstr suddenly kicks in and causes disastrous reboxing of the LiftingContext argument. To make this less likely to happen, this commit lowers the SpecConstr threshold. - - - - - c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - 955a2571 by Simon Peyton Jones at 2026-08-14T00:26:37+02:00 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 <rodrigo.m.mesquita(a)gmail.com> The couple hundreds of hours spent here by Rodrigo were sponsored by Well-Typed Metrics: compile_time/bytes allocated ------------------------------------- Baseline Test Metric value New value Change ------------------------------------------------------------------------------------------ MultiComponentModules100(normal) ghc/alloc 24,312,779,672 24,990,470,432 +2.8% BAD MultiComponentModulesRecomp(normal) ghc/alloc 601,924,960 621,884,888 +3.3% BAD MultiComponentModulesRecomp100(normal) ghc/alloc 11,884,065,432 12,531,373,704 +5.4% BAD MultiLayerModules(normal) ghc/alloc 3,861,537,072 3,706,919,512 -4.0% GOOD T13701(normal) ghc/alloc 3,517,246,392 3,237,179,616 -8.0% GOOD T13820(normal) ghc/alloc 28,961,056 29,663,208 +2.4% BAD T14697(normal) ghc/alloc 472,044,184 443,550,048 -6.0% GOOD T18140(normal) ghc/alloc 47,905,664 49,115,808 +2.5% BAD T4801(normal) ghc/alloc 269,339,096 263,432,040 -2.2% GOOD T783(normal) ghc/alloc 341,112,672 333,339,952 -2.3% GOOD hard_hole_fits(normal) ghc/alloc 222,164,728 213,433,808 -3.9% GOOD mhu-perf(normal) ghc/alloc 49,011,440 46,706,280 -4.7% GOOD geo. mean +0.1% minimum -8.0% maximum +5.4% All performance regressions were investigated in depth. The surviving ones: - MultiComponentModules100, MultiComponentModulesRecomp100, MultiComponentModulesRecomp regresses because existing bugs that make an additional implicit edge do too much redundant work: #27053 and #27461 - T13820, T18140, T10547, T13035 regress because we load an additional interface and associated Names for GHC.Essentials. ------------------------- Metric Decrease: MultiLayerModules T13379 T13701 T14697 T26989 T4801 T783 T9961 hard_hole_fits mhu-perf size_hello_artifact size_hello_obj size_hello_unicode Metric Increase: LinkableUsage01 LinkableUsage02 MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 T10547 T13035 T13820 T18140 T18698a T18698b T20049 ------------------------- Bumps submodule binary Closes #27013 - - - - - 2a793bff by sheaf at 2026-08-14T00:26:41+02:00 Allow GHC.Essentials to be hidden This commit overhauls several aspects of the known entity handling, in order to allow GHC.Essentials to be hidden without a proliferation of special cases in the compiler. The main contribution is to introduce the 'UnresolvedImport' datatype which cleans up a lot of ad-hoc handling relating to 'ModSummary', fixing #27603. This allows us to reduce duplication, e.g. by having Backpack reuse 'mkUnresolvedImports' instead of replicating the "add implicit imports" logic. It also makes it easier to avoid undesirable edge cases (such as making sure that the Template Haskell 'reifyModule' function does not leak the implicit GHC.Essentials import). In particular, the infamous 'findImportedModuleWithIsBoot' is now simply 'resolveImport', taking a single 'UnresolvedImport' and resolving it to a 'FindResult' (usually a 'Module'). Other changes: - Cache the result of looking up GHC.Essentials (in TcM and DsM environments) to avoid redundant work. This reduces allocations on LinkableUsage01 and hard_hole_fits. - Properly look up known entities for StaticPointers like we do for other known entities everywhere else. This allows e.g. modules in ghc-internal to use -XStaticPointers. - When using multiple home units, we are now careful to handle the situation in which we may have multiple GHC.Essentials modules around. See the new tests under 'driver/multipleHomeUnits'. - - - - - 845 changed files: - + changelog.d/T20363 - changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/link-deterministic-order - + 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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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e67f4c90379d69d34fff54ced6248e… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/e67f4c90379d69d34fff54ced6248e… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/int-index/rta-patsyn-lookup] 35 commits: EPA: Remove LocatedP from OverlapMode
by Vladislav Zavialov (＠int-index) 14 Aug '26

14 Aug '26

Vladislav Zavialov pushed to branch wip/int-index/rta-patsyn-lookup at Glasgow Haskell Compiler / GHC Commits: 85b10c00 by Alan Zimmerman at 2026-07-31T22:09:47+01:00 EPA: Remove LocatedP from OverlapMode We have type LocatedP = GenLocated SrcSpanAnnP type SrcSpanAnnP = EpAnn AnnPragma As the first step in removing this in favour of LocatedA which only captures location, comments and trailing annotations, we remove it from OverlapMode We do this by moving the AnnPragma into the TTG extension point instead. - - - - - c9a34a00 by Viktor Dukhovni at 2026-08-02T04:34:17-04:00 Fix note typo - - - - - 4f2a21f7 by Andreas Klebinger at 2026-08-02T22:46:46-04:00 Apply oneShot Monad trick to STG LintM - - - - - 21e4b89d by Andreas Klebinger at 2026-08-02T22:46:46-04:00 stgLint: Use a single reader env for read only arguments. - - - - - d415f38a by Alan Zimmerman at 2026-08-02T22:47:27-04:00 EPA: Remove LocatedP from CType The next step of removing use of LocatedP by moving the AnnPragma for CType into its TTG extension point instead. - - - - - 8fc6f882 by Simon Jakobi at 2026-08-05T14:53:41-04:00 testsuite: Don't crash on non-UTF-8 test output read_stdout, read_stderr_for, read_comp_stderr and read_diff decoded strictly (the first three with UTF-8, read_diff with the locale encoding), so a test emitting invalid UTF-8 (binary output, or a crash truncating a multi-byte character) raised UnicodeDecodeError and was reported as a framework failure instead of its actual result. Decode with errors='replace', like read_no_crs and safe_print. Assisted-by: Claude Fable 5 - - - - - 56534866 by Simon Jakobi at 2026-08-05T14:53:41-04:00 testsuite: Colorize the test summary, also in CI The summary headings were plain, and SUMMARY was colored unconditionally, so the escapes also ended up in the file written by --summary-file. Color is now decided per output sink via term_color.colored_if; see the comments in term_color. CI logs are not a tty, but GitLab's log viewer renders ANSI colors, so add --force-colors and pass it in .gitlab/ci.sh. Assisted-by: Claude Opus 5 - - - - - bceb541a by Simon Jakobi at 2026-08-05T14:53:42-04:00 testsuite: Repeat unexpected failure output in the summary Finding out why a test failed meant scrolling back through a possibly very long log to the point where the test ran. The summary now repeats the captured output of unexpected failures, before the statistics, so the most interesting part is at the end of the log (#16720). Output mismatches report their diff instead of the mismatching stream (see Note [Redundant output in test results]). The repeated output is bounded per stream, and skipped altogether beyond MAX_SUMMARY_OUTPUT_TESTS failure blocks. Tests failing identically in several ways share one block. Test results now report a source-relative directory, stable regardless of where the run was started from. Assisted-by: Claude Fable 5 - - - - - 2ab02c57 by Ben Gamari at 2026-08-05T14:54:24-04:00 base: Don't drop exception context in SomeException(toException) For reasons that are lost to time, the implementation of [CLC #200] that was merged inappropriately dropped `ExceptionContext` in the `toException` implementation given to `SomeException`. Fix this infelicity. [CLC #200]: https://github.com/haskell/core-libraries-committee/issues/200 - - - - - 126ce574 by Vladislav Zavialov at 2026-08-05T14:55:05-04:00 Test case for #20902 Starting with GHC 9.14.1 (the first major release to include 51e3ec83), and from point releases GHC 9.10.2 and GHC 9.12.3 (backports cc4470be68 and b30f25591e), all examples in this ticket are handled as expected. - - - - - b14d8d59 by Alan Zimmerman at 2026-08-05T14:55:46-04:00 EPA: Remove LocatedP, last use in WarningTxt The last step of removing LocatedP, by moving the AnnPragma for WarningTxt into its TTG extension point instead. This also allows us to remove LocatedP and SrcSpanAnnP - - - - - 70b58c8f by Vladislav Zavialov at 2026-08-05T14:56:27-04:00 Test cases for #18725 Starting with GHC 9.4 (the first release to include 268efcc9a4), the program in this ticket no longer panics. A standalone kind signature breaks the recursive loop, so the type constructor can be used in a kind within its own group. T18725a checks that this is accepted with the signature present, while T18725b confirms it is still rejected without it. - - - - - b18c8dd5 by Zubin Duggal at 2026-08-06T15:51:01-04:00 hie files: Dump the type table when dumping with -ddump-hie - - - - - f839d0fb by Zubin Duggal at 2026-08-06T15:51:01-04:00 hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast Fixes #25709 - - - - - 5753ebaa by Simon Jakobi at 2026-08-06T15:51:43-04:00 testsuite: fix stale paths for the ghc-config build artifacts ghc-config.hs moved from testsuite/mk/ to testsuite/ghc-config/ in 6c7a49139c, but the .gitignore entry and the clean rule still referred to the old location. As a result the compiled ghc-config binary, which boilerplate.mk rebuilds on every make-driven test run, showed up as an untracked file and was never cleaned. Assisted-by: Claude Opus 5 - - - - - 246d4d72 by Simon Peyton Jones at 2026-08-06T15:52:25-04:00 Documentation only ...driven by my investigation of #27591 - - - - - be69e9df by Alan Zimmerman at 2026-08-06T15:53:05-04:00 EPA: Replace AnnPragma with individual types We introduced AnnPragma as a common type for all pragma usages wrapped in LocatedP / SrcSpanAnnP. Now that those are gone, and the AnnPragma moved into the TTG points for the given items, we can ensure that each carries only the annotations it needs. So we remove AnnPragma, and in its place bring in AnnCType AnnWarningTxt AnnOverlap AnnAnnDecl AnnPragSCC - - - - - 0779e12c by Simon Jakobi at 2026-08-07T12:36:11-04:00 Cmm: print unreachable blocks under -dppr-debug (#27368) Unreachable blocks linger in a CmmGraph's block map for most of the Cmm pipeline, but pprCmmGraph only ever printed the blocks reachable from the entry, so dumps looked consistent while the graph was not. Issues like #27368 were hard to debug due to this. pprCmmGraph now appends the stored-but-unreachable blocks under a "// unreachable blocks:" heading when -dppr-debug is on. See Note [unreachable blocks] in GHC.Cmm.Pipeline. Assisted-by: Claude Opus 5 - - - - - 3a0f9a51 by Simon Peyton Jones at 2026-08-07T12:36:54-04:00 Fix three bugs related to required type args and INLINE pragmas * `GHC.Core.Opt.Arity.mkEtaForAllMCo` got the visibility flags back to front, leading to a Lint error (#27557) * The arity in an InlineSaturation is the VisArity not the Arity; the two can differ when we have "required" type arguments. This made the INLINE pragma argument counting go wrong in `makeCorePair` (#27590). * When a simple binding has a type signature, we take special path in `tcPolyCheck`, leading to an outer `AbsBinds` that has no dictionaries, even when the binding is in fact overloaded. That confused the inline-arity computation in `makeCorePair` (#27589). The latter two are fixed using the new function `GHC.HsToCore.Binds.findSatArity`. That actually simplifies the API of `makeCorePair`, which is nice. The first bug is fixed by swapping the visiblity flags in `GHC.Core.Opt.Arity.mkEtaForAllMCo` Getting the INLINE behaviour right led to some perf changes: * Runtime /halved/ on T7954 due to better specialisation * Compile time increased by 6% in T21839c because a bit more inlining happened, as it always should have done. * For some reason compile-time max-bytes-used dropped by 30% on T27336, but only on one build configuration; and it increased on LinkableUsage02 by 6% on another configuration Geometric mean effect on our compile time benchmarks is +0.1%. Metric Decrease: T27336 T7954 Metric Increase: LinkableUsage02 T21839c - - - - - 4f985108 by Vladislav Zavialov at 2026-08-07T17:49:50-04:00 Discard type arguments in tcPatToExpr (#27440, #27583) The builder expression of an implicitly bidirectional pattern synonym must not mention types written in the RHS: * Invisible type arguments led to a panic (#27440) * Required type arguments failed with out-of-scope variables (#27583) Both are now discarded, following the precedent established by pattern signatures (#9867). Discarding type arguments takes some care: a type pattern cannot be told from a value pattern by syntax alone, as the `type` keyword may be omitted. Consider: data T a b c where MkT :: forall a. forall b c -> a -> T a b c pattern P :: x -> T x y z pattern P x = MkT @a (type b) c x In P's right-hand side, `@a` and `type b` are clearly type arguments, but what about `c` and `x`? We can only tell by matching the patterns against MkT's type. So tcPatToExpr now runs in TcM and matches the arguments against the constructor's TyVarBinders using zipPatsBndrs, which is made public for this purpose. The resulting builder is $bP x = MkT _ _ x. See Note [Discarding types in the builder expression]. Test cases: T27440a T27440b T27440c T27440d T27440e T27583a T27583b T27583c T27583d T27583e T27583f T27583g Metric Increase: LinkableUsage02 Metric Decrease: T27336 Assisted-by: Claude Opus 5 - - - - - eb1dcd4d by sheaf at 2026-08-07T17:50:40-04:00 mkWpFun_FRR: fix ordering of coercion composition When the subsumption machinery generates an eta-expansion, we must perform a representation polymorphism check to ensure the lambda binder it introduces has a fixed runtime representation. This is done in GHC.Tc.Utils.mkWpFun_FRR. This check involves composing quite a few coercions, arising from representation-polymorphism checks on both the actual and expected argument types. These coercions are then chained using HsWrapper composition, <.>. The ordering of composition was incorrect, leading to the Core Lint failure reported in #27639. This commit fixes that. Fixes #27639 - - - - - 3a552476 by Simon Jakobi at 2026-08-09T15:20:06-04:00 Word64Map: add compareSize compareSize m c compares the size of a map to an Int, but unlike compare (size m) c it stops traversing the map once the outcome is determined. Based on https://github.com/haskell/containers/pull/1139 Assisted-by: Claude Opus 5 - - - - - 6e2c99d8 by Simon Jakobi at 2026-08-09T15:20:06-04:00 Use a pigeonhole sort for deterministic UniqDFM iteration Deterministic UniqDFM iteration used a list mergesort, allocating O(n log n) cons cells and contributing significantly to compiler allocations (#27459). Use a pigeonhole sort where appropriate, while retaining the mergesort fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic iteration]. The peak_megabytes_allocated increase for LinkableUsage02 is probably due to GC timing noise. See #27613. ------------------------- Metric Decrease: InstanceMatching InstanceMatching1 ManyAlternatives T12707 T13379 T13719 T24471 T27336 T5321FD T5321Fun T783 Metric Increase 'peak_megabytes_allocated': LinkableUsage02 ------------------------- Assisted-by: gpt-5.6-sol via Codex CLI - - - - - a938ab12 by sheaf at 2026-08-09T15:20:48-04:00 Testsuite: don't measure max residency for T27336 We really care more about total allocations for this test, so this commit removes the maximum residency measurement. - - - - - 7d94bb78 by Alan Zimmerman at 2026-08-09T15:21:29-04:00 EPA: Remove LocatedE, replace with LocatedA This gets rid of one more LocatedXXX occurrence - - - - - 9df24b7e by sheaf at 2026-08-10T14:28:30-04:00 hie.yaml: use a polyglot shell/batch script This commit merges hie-bios and hie-bios.bat into a single polyglot script. This avoids Windows users having to manually update hie.yaml in order to be able to use HLS. - - - - - 7f75c588 by Alan Zimmerman at 2026-08-10T14:29:11-04:00 EPA: Remove type parameter from AnnList This is a step towards cutting AnnList down to its core for formatting lists only - - - - - e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00 driver: Link object files in a deterministic order The object files handed to the linker come from the HomePackageTable, which is ordered by the order in which modules finished compiling. With -j1 that is the build plan order, with -jN it is whatever the scheduler produced, so the same sources can link to different (but equivalent) binaries. The order reaches the output: .text and .rodata contributions are concatenated in link order, so e.g. building the hdav executable of the DAV package twice, once with -j1 and once with -j4, yields two binaries that differ in ~100kB of section contents. Sort the home modules by module before collecting their linkables, guarded under `Opt_ObjectDeterminism` . Fixes #27612 Signed-off-by: Bernhard M. Wiedemann <bwiedemann(a)suse.de> - - - - - 556db2f3 by sheaf at 2026-08-10T21:32:06-04:00 Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite As remarked in #27628, this module currently sits on a knife's edge: if the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then SpecConstr suddenly kicks in and causes disastrous reboxing of the LiftingContext argument. To make this less likely to happen, this commit lowers the SpecConstr threshold. - - - - - c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - b8d35752 by Vladislav Zavialov at 2026-08-14T00:25:56+03:00 Fix tcLookupId panic with RequiredTypeArguments and PatternSynonyms (#27586) The arguments declared on the left-hand side of a pattern synonym are looked up as term variables bound by its right-hand side. Prior to this patch, that lookup panicked with RequiredTypeArguments: data T a where MkT :: forall a -> T a pattern P :: Int -> T Int pattern P x = MkT x On the RHS, `x` looks like a term argument, so the renamer binds it in the term namespace. Only during type checking does it turn out to be a type variable, so the lookup on the LHS finds an ATyVar rather than an ATcId. As the lookup was done with tcLookupId, it resulted in a panic. Now the arguments are looked up with tcLookupPatSynArg, which reports an illegal term-level use of `x`, just as an ordinary function definition `f (MkT x) = x` does. Test cases: T27586a T27586b T27586c Assisted-by: Claude Opus 5 - - - - - 187 changed files: - .gitlab/ci.sh - + changelog.d/T20363 - + changelog.d/T27368-ppr-unreachable-cmm-blocks.md - + changelog.d/T27440 - + changelog.d/T27455 - + changelog.d/T27557 - + changelog.d/T27583 - + changelog.d/T27586 - + changelog.d/T27589 - + changelog.d/T27639 - changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/link-deterministic-order - compiler/GHC/Builtin/Utils.hs - compiler/GHC/Cmm.hs - compiler/GHC/Cmm/Pipeline.hs - compiler/GHC/Core/Class.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Data/Word64Map/Internal.hs - compiler/GHC/Data/Word64Map/Lazy.hs - compiler/GHC/Data/Word64Map/Strict.hs - compiler/GHC/Data/Word64Map/Strict/Internal.hs - compiler/GHC/Driver/Main/Passes.hs - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Hs/Binds.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Decls/Overlap.hs - compiler/GHC/Hs/Dump.hs - compiler/GHC/Hs/Expr.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/Hs/Utils.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match.hs-boot - compiler/GHC/HsToCore/Match/Constructor.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Ticks.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Iface/Ext/Ast.hs - compiler/GHC/Iface/Ext/Types.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Warnings.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Rename/HsType.hs - compiler/GHC/Rename/Pat.hs - compiler/GHC/Stg/Lint.hs - compiler/GHC/Tc/Deriv.hs - compiler/GHC/Tc/Gen/Bind.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Solver/Rewrite.hs - compiler/GHC/Tc/TyCl/Instance.hs - compiler/GHC/Tc/TyCl/PatSyn.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Tc/Utils/Instantiate.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/ThToHs.hs - compiler/GHC/Types/Arity.hs - compiler/GHC/Types/ForeignCall.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/InlinePragma.hs - compiler/GHC/Types/Unique/DFM.hs - compiler/GHC/Types/Var.hs - compiler/GHC/Unit/Module/Warnings.hs - docs/index.html.in - docs/users_guide/debugging.rst - docs/users_guide/ghc_config.py.in - docs/users_guide/separate_compilation.rst - docs/users_guide/using.rst - − hadrian/hie-bios - hadrian/hie-bios.bat - hadrian/src/Rules/Generate.hs - hie.yaml - libraries/base/changelog.md - libraries/base/tests/perf/ElemFusionUnknownList_O1.stderr - libraries/base/tests/perf/ElemFusionUnknownList_O2.stderr - libraries/ghc-internal/src/GHC/Internal/Exception/Type.hs - libraries/ghc-internal/src/GHC/Internal/Ix.hs - rts/LdvProfile.c - rts/PrimOps.cmm - rts/Printer.c - rts/ProfHeap.c - rts/include/rts/storage/ClosureMacros.h - rts/sm/Sanity.c - rts/sm/Storage.c - testsuite/.gitignore - testsuite/Makefile - testsuite/driver/runtests.py - testsuite/driver/term_color.py - testsuite/driver/testlib.py - testsuite/tests/cmm/should_compile/Makefile - + testsuite/tests/cmm/should_compile/T27368-ppr-debug.cmm - + testsuite/tests/cmm/should_compile/T27368-ppr-debug.stdout - testsuite/tests/cmm/should_compile/all.T - testsuite/tests/corelint/T21115b.stderr - testsuite/tests/dmdanal/should_compile/T23398.stderr - testsuite/tests/ghc-api/T25121_status.stdout - testsuite/tests/ghc-api/exactprint/T22919.stderr - testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr - testsuite/tests/ghc-e/should_fail/T18441fail7.stderr - testsuite/tests/ghc-e/should_run/ghc-e005.stderr - testsuite/tests/hiefile/should_compile/T24493.stderr - + testsuite/tests/hiefile/should_run/T25709.hs - + testsuite/tests/hiefile/should_run/T25709.stdout - testsuite/tests/hiefile/should_run/all.T - testsuite/tests/module/mod185.stderr - testsuite/tests/numeric/should_compile/T23907.stderr - testsuite/tests/parser/should_compile/DumpParsedAst.stderr - testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr - 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testsuite/tests/rep-poly/T20113.stderr - − testsuite/tests/rep-poly/T20363.stderr - − testsuite/tests/rep-poly/T20363_show_co.hs - − testsuite/tests/rep-poly/T20363_show_co.stderr - − testsuite/tests/rep-poly/T20363b.stderr - + testsuite/tests/rep-poly/T20363c.hs - + testsuite/tests/rep-poly/T27639.hs - testsuite/tests/rep-poly/all.T - + testsuite/tests/rts/T27585.hs - + testsuite/tests/rts/T27585.stdout - testsuite/tests/rts/all.T - + testsuite/tests/saks/should_compile/T18725a.hs - testsuite/tests/saks/should_compile/all.T - + testsuite/tests/saks/should_fail/T18725b.hs - + testsuite/tests/saks/should_fail/T18725b.stderr - testsuite/tests/saks/should_fail/all.T - testsuite/tests/simplCore/should_compile/T24229a.stderr - testsuite/tests/simplCore/should_compile/T24229b.stderr - + testsuite/tests/simplCore/should_compile/T27589.hs - + testsuite/tests/simplCore/should_compile/T27589.stderr - + testsuite/tests/simplCore/should_compile/T27590.hs - + testsuite/tests/simplCore/should_compile/T27590.stderr - 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+ testsuite/tests/vdq-rta/should_fail/T27586a.hs - + testsuite/tests/vdq-rta/should_fail/T27586a.stderr - + testsuite/tests/vdq-rta/should_fail/T27586b.hs - + testsuite/tests/vdq-rta/should_fail/T27586b.stderr - + testsuite/tests/vdq-rta/should_fail/T27586c.hs - + testsuite/tests/vdq-rta/should_fail/T27586c.stderr - testsuite/tests/vdq-rta/should_fail/all.T - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/check-exact/Transform.hs - utils/check-exact/Utils.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/bc17078d777968741f305cd24de11b… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/bc17078d777968741f305cd24de11b… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/az/epa-tidy-locatedxxx-16] 8 commits: driver: Link object files in a deterministic order
by Alan Zimmerman (＠alanz) 14 Aug '26

14 Aug '26

Alan Zimmerman pushed to branch wip/az/epa-tidy-locatedxxx-16 at Glasgow Haskell Compiler / GHC Commits: e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00 driver: Link object files in a deterministic order The object files handed to the linker come from the HomePackageTable, which is ordered by the order in which modules finished compiling. With -j1 that is the build plan order, with -jN it is whatever the scheduler produced, so the same sources can link to different (but equivalent) binaries. The order reaches the output: .text and .rodata contributions are concatenated in link order, so e.g. building the hdav executable of the DAV package twice, once with -j1 and once with -j4, yields two binaries that differ in ~100kB of section contents. Sort the home modules by module before collecting their linkables, guarded under `Opt_ObjectDeterminism` . Fixes #27612 Signed-off-by: Bernhard M. Wiedemann <bwiedemann(a)suse.de> - - - - - 556db2f3 by sheaf at 2026-08-10T21:32:06-04:00 Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite As remarked in #27628, this module currently sits on a knife's edge: if the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then SpecConstr suddenly kicks in and causes disastrous reboxing of the LiftingContext argument. To make this less likely to happen, this commit lowers the SpecConstr threshold. - - - - - c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - 823ed99d by Alan Zimmerman at 2026-08-13T17:44:19+01:00 EPA: Remove al_trailing from AnnList It was not being used - - - - - 71 changed files: - + changelog.d/T20363 - changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/link-deterministic-order - compiler/GHC/Driver/Pipeline.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match.hs-boot - compiler/GHC/HsToCore/Match/Constructor.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/Annotation.hs - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Solver/Rewrite.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Types/Id/Make.hs - docs/index.html.in - docs/users_guide/ghc_config.py.in - docs/users_guide/separate_compilation.rst - docs/users_guide/using.rst - hadrian/src/Rules/Generate.hs - rts/LdvProfile.c - rts/PrimOps.cmm - rts/Printer.c - rts/ProfHeap.c - rts/include/rts/storage/ClosureMacros.h - rts/sm/Sanity.c - rts/sm/Storage.c - testsuite/tests/corelint/T21115b.stderr - testsuite/tests/dmdanal/should_compile/T23398.stderr - testsuite/tests/ghc-api/exactprint/T22919.stderr - testsuite/tests/ghc-api/exactprint/ZeroWidthSemi.stderr - testsuite/tests/module/mod185.stderr - testsuite/tests/numeric/should_compile/T23907.stderr - testsuite/tests/parser/should_compile/DumpParsedAst.stderr - testsuite/tests/parser/should_compile/DumpParsedAstComments.stderr - testsuite/tests/parser/should_compile/DumpRenamedAst.stderr - testsuite/tests/parser/should_compile/DumpSemis.stderr - testsuite/tests/parser/should_compile/KindSigs.stderr - testsuite/tests/parser/should_compile/T15279.stderr - testsuite/tests/parser/should_compile/T20718.stderr - testsuite/tests/parser/should_compile/T20846.stderr - testsuite/tests/perf/compiler/all.T - testsuite/tests/printer/Test20297.stdout - testsuite/tests/printer/Test24533.stdout - testsuite/tests/rep-poly/RepPolyRecordPattern.hs - testsuite/tests/rep-poly/RepPolyRecordPattern.stderr - testsuite/tests/rep-poly/RepPolyRecordUpdate.stderr - testsuite/tests/rep-poly/T20113.stderr - − testsuite/tests/rep-poly/T20363.stderr - − testsuite/tests/rep-poly/T20363_show_co.hs - − testsuite/tests/rep-poly/T20363_show_co.stderr - − testsuite/tests/rep-poly/T20363b.stderr - + testsuite/tests/rep-poly/T20363c.hs - testsuite/tests/rep-poly/all.T - + testsuite/tests/rts/T27585.hs - + testsuite/tests/rts/T27585.stdout - testsuite/tests/rts/all.T - testsuite/tests/simplCore/should_compile/T24229a.stderr - testsuite/tests/simplCore/should_compile/T24229b.stderr - testsuite/tests/simplCore/should_compile/T3717.stderr - testsuite/tests/simplCore/should_compile/T3772.stdout - testsuite/tests/simplCore/should_compile/T4081.stderr - testsuite/tests/simplCore/should_compile/T4908.stderr - utils/check-exact/ExactPrint.hs - utils/check-exact/Main.hs - utils/check-exact/Transform.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/84444a2176ec0b3e6f9671da996fea… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/84444a2176ec0b3e6f9671da996fea… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/sjakobi/nonmoving-gc-test-fixes] 79 commits: ci: Reduce lint job setup costs
by Simon Jakobi (＠sjakobi) 14 Aug '26

14 Aug '26

Simon Jakobi pushed to branch wip/sjakobi/nonmoving-gc-test-fixes at Glasgow Haskell Compiler / GHC Commits: 700a1dd1 by Simon Jakobi at 2026-07-23T11:21:20-04:00 ci: Reduce lint job setup costs Avoid fetching unnecessary history and submodules for lightweight lint jobs. Run changelog validation without Hadrian. Because the lint-author job is now based on the .lint template directly, we enhance it to allow Git to read from the runner-owned checkouts, In the previously used .lint-params template, this permissions issue was addressed via `chown`. Closes #27521. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 26a44fb0 by ARATA Mizuki at 2026-07-23T11:22:10-04:00 testsuite: Fix memory issues of doublex2_* and simd010 doublex2_* had reads from uninitialized memory. simd010 had out-of-bounds array access. Fixes #27544 - - - - - 4d798b17 by Duncan Coutts at 2026-07-23T17:26:18-04:00 Eliminate STM_AWOKEN It was used as nullary closure for the block_info.closure in the case of a thread being awoken after an STM transaction. However, while it was written, it was never read, so contributed nothing to the behaviour. Furthermore, in the only place it was set (in tryWakeupThread) the why_blocked was immediately overwritten by the NotBlocked status, and the block_info was updated accordingly (by appendToRunQueue). So it didn't even serve a purpose of clarifying an intermediate state, there really was no such intermediate state. Cleaning this up will allow the BlockedOnSTM case to follow the same pattern as the other why_blocked cases that do not use the block_info, and in turn this reduces the number of different categories. - - - - - e1cece79 by Duncan Coutts at 2026-07-23T17:26:18-04:00 Document that eventlog thread stop code ThreadBlocked is no longer used It has not been used since GHC 7.0.x (2011). In 7.2 all the BlockedOn* codes were added, and these were and are used instead of ThreadBlocked. - - - - - 795db115 by Duncan Coutts at 2026-07-23T17:26:18-04:00 Add a proper mapping to eventlog external thread stop status That is the mapping from rts-internal codes, to the coes used in the status field in the eventlog EVENT_STOP_THREAD event. See issue #9003 for what goes wrong when we mess this up. In that ticket, people note that we should really not require the internal tso->why_blocked codes to leak into the external eventlog thread stop codes. The same principle applies to the StgThreadReturnCode. This change properly separates them, and explicitly maps between them using a pair of (compact, constant) tables. These tables are pretty small (with no alignment constraints) and will soon shrink so it seems a sensible tradeoff. We also introduce and use proper EVENT_STOP_THREAD constants in the event log format header. Previously there was not specification in the code for these (only in the docs): the values were encoded into the conversion code. This will allow us to renumber the internal why_blockd codes without breaking the eventlog output. - - - - - 6f1c8efa by Duncan Coutts at 2026-07-23T17:26:18-04:00 Remove unused tso->block_info.wakeup member Presumably it was used once, but not now. - - - - - 740b88a9 by Duncan Coutts at 2026-07-23T17:26:18-04:00 Document StgTSOBlockInfo to say what cases use what members In principle, tso->why_blocked is the tag for the StgTSOBlockInfo union, so we should be able to say for each union member the why_blocked cases that use that member. - - - - - 5b92eae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00 Add a tso->block_info.mvar member and use it in preference to the generic block_info.closure union member, with casts. The plan is that when we know what case we're in (via tso->why_blocked) then we can always access the correct union member, and so we will only need to access block_info.closure for generic cases where we don't know or don't care. - - - - - d931715f by Duncan Coutts at 2026-07-23T17:26:18-04:00 Add a tso->block_info.unused member and use it in preference to the generic block_info.closure union member, with casts. The plan is that when we know what case we're in (via tso->why_blocked) then we can always access the correct union member, and so we will only need to access block_info.closure for generic cases where we don't know or don't care. - - - - - 47e28ebb by Duncan Coutts at 2026-07-23T17:26:18-04:00 Avoid storing to tso->block_info.closure In one case we can use a specific union member (.prev) instead. In several cases the stores were in fact redundant because of subsequent overwrites. In scavengeTSO we replace setting tso->block_info.closure to a valid closure, with an assertion that the block_info.unused is already set to END_TSO_QUEUE which is a valid (static) closure. - - - - - 96e4749d by Duncan Coutts at 2026-07-23T17:26:18-04:00 Renumber the tso->why_blocked constants We can do this now because we have separated the internal values from the external ones used in the eventlog. This lets us put them back into a deliberate order and consolodate some gaps. More importantly, it is a prepation for a slightly more sophisticated encoding. - - - - - 8f62661c by Duncan Coutts at 2026-07-23T17:26:18-04:00 Define constants for the existing stg_threadStatuszh return codes The stg_threadStatuszh reuses the internal tso->why_blocked codes but also extends them with a couple previously magic values. This is awkward since we need to know what those magic values are so we don't accidentally use those values to mean something else. By pulling a definition up to where the why_blocked codes are defined we will be able to avoid mistakenly assining those codes some meaning (or just changing the BlockedThreadComplete, BlockedThreadKilled code if necessary). - - - - - 42c69ae2 by Duncan Coutts at 2026-07-23T17:26:18-04:00 Extend the tso->why_blocked encoding to indicate block_info closures We use some bit tricks to cheaply and generically test if a tso->why_blocked tag implies that the corresponding tso->block_info will contain a non-trivial valid closure (i.e. not just block_info.unused set to END_TSO_QUEUE). In particular we arrange for most why_blocked values to naturally have a distinguishing bit, but for the BlockedOn{Read,Write,Delay} cases, they can come in either non-closure or closure forms. We allow an additional bit to distinguish these cases. The non-closure forms are only from legacy I/O managers: select and win32-legacy. So this extra bit mechanism will be able to be retired once the legacy I/O managers are themselves retired. This means in a few places we need to untag the why_blocked value before inspecting it, but in most places we do not. - - - - - 7c64632b by Duncan Coutts at 2026-07-23T17:26:18-04:00 Use BlockInfoForceNonClosure in the select I/O manager - - - - - 8fd7104a by Duncan Coutts at 2026-07-23T17:26:18-04:00 Use BlockInfoForceNonClosure in the win32-legacy I/O manager for the BlockedOn{Read,Write} since these use the non-heap allocated StgAsyncIOResult. - - - - - e0da603b by Duncan Coutts at 2026-07-23T17:26:18-04:00 Enforce the why_blocked and block_info rules in checkTSO We now check the cases wher IsBlockInfoClosure should hold, the cases that are supposed to use block_info.unused == END_TSO_QUEUE, and which cases are allowed to use BlockInfoForceNonClosure. This partially enforces the use of why_blocked as a tag for the block_info union. We could be stricter and check for the correct expected info table for the closure cases. - - - - - 1dd0f381 by Duncan Coutts at 2026-07-23T17:26:18-04:00 Use IsBlockInfoClosure to simplify several tests In GC and generic traversal we need to know if we should look at the block_info.closure or not. Now we can do just that using a cheap bit test on the why_blocked tag. This fixes issue 26717, where the problem was that some GC modes did not know when to look at block_info.closure, because the poll I/O manager uses a closure for BlockedOn{Read,Write} while the select I/O manager uses a non-closure. Now this information is in the why_blocked tag itself. - - - - - 7a00ffbc by Duncan Coutts at 2026-07-23T17:26:18-04:00 Remove the now-unused scavengeTSOIOManager The GC no longer has to delegate to the I/O manager, since it can use IsBlockInfoClosure to decide things itself. - - - - - 522a481f by Duncan Coutts at 2026-07-23T17:26:18-04:00 Remove duplicate assertion - - - - - 0874d965 by Duncan Coutts at 2026-07-23T17:26:18-04:00 Follow atomic access rules more consistently for tso->why_blocked The rule is this: store block_info *before* why_blocked store why_blocked using store release load why_blocked using load acquire load block_info *after* why_blocked This is a an atomic store release / load acquire pair and (if the reads are in a separate thread to the writes, and the read receives the value stored) then this guarantees a full "happens before" relationship of these stores and loads. In some cases, we do not need a full load acquire, because we don't read the block_info at all and so do not need any ordering. In this case we just need an atomic relaxed load. This was being followed in most places, but not all. If there's good reason in any case that we don't need atomic access, then we should document that in a comment. In the absence of that I think it's easier to follow the rule everywhere. - - - - - 8f0bdbe1 by Duncan Coutts at 2026-07-23T17:26:19-04:00 Add a changelog entry - - - - - 4fdfe757 by Alan Zimmerman at 2026-07-23T17:27:06-04:00 EPA: Keep decls together in ClassDecl Similar to 1718230f4d3d19d8c49c0e5d496cb0fb6f399528 for HsValBindsLR, this commit updates ClassDecl so that it no longer splits out the assorted `LHsDecl GhcPs` until the renamer. It does this by inserting a type family (separate from the classic TTG one) for this. So data TyClDecl ... | ClassDecl { ... tcdDecls :: XClassDecls pass with type instance XClassDecls GhcPs = [LHsDecl GhcPs] type instance XClassDecls GhcRn = ClassDeclX GhcRn type instance XClassDecls GhcTc = ClassDeclX GhcTc data ClassDeclX pass = ClassDeclX { tcdSigs :: [LSig pass], -- ^ Methods' signatures tcdMeths :: LHsBinds pass, -- ^ Default methods tcdATs :: [LFamilyDecl pass], -- ^ Associated types; tcdATDefs :: [LTyFamDefltDecl pass], -- ^ Associated type defaults tcdDocs :: [LDocDecl pass] -- ^ Haddock docs } - - - - - f586c885 by Simon Jakobi at 2026-07-24T18:05:00-04:00 ci: Use shallow submodule clones by default Limit submodule clones to depth one to reduce CI checkout costs. Keep fetching full submodule history for the submodule lint jobs, which inspect commits across a range. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 306120d2 by Duncan Coutts at 2026-07-24T18:05:43-04:00 Fix flaky test T3994 on FreeBSD On current FreeBSD versions, calling getpgid on a zombie process fails. In T3994, if we're really unlucky with delays and scheduling then we can end up in exactly that situation. Just catch that specific exception and ignore it. It's rare, and not our fault. - - - - - 7b116a0b by Cheng Shao at 2026-07-24T18:06:24-04:00 ci: add missing workaround for docker permissions in lint jobs Some lint jobs use ci-images with default user `ghc`, and the gitlab ci docker executor requires the `sudo chown` workaround to fix workspace directory permission issue. This patch adds the missing workarounds for the lint jobs. Fixes #27554. Co-authored-by: Codex <codex(a)openai.com> - - - - - 815149f3 by Andrzej Rybczak at 2026-07-25T15:06:43+00:00 Add -Wdefaulted-callstack Adds a new warning, -Wdefaulted-callstack, which warns when an implicit CallStack parameter is defaulted to the empty stack. In particular, this includes call sites where a function with a HasCallStack constraint is called from a definition that does *not* provide one. At such call sites the call stack is cut off and does not include the enclosing definition's callers, which can be a source of surprise if the user wants complete call stacks. Closes #27077. - - - - - f6f2343f by Zubin Duggal at 2026-07-25T17:40:51-04:00 UniqueDFM: alter should preserve insertion order Before it always inserting new elements at the end. This is problematic because instances get inserted into the map with `alterF`, which can change ordering of how instances are printed with `:info` depending on the order in which we consult interfaces I expect `alter id k = id` and `alter (fmap f) k = adjust f k`. Moving keys to the end breaks that (`adjust` already preserves position). Fixes #27532 - - - - - 5d0ab71a by fendor at 2026-07-27T17:31:05-04:00 Introduce global unit database cache As a first step for better sharing of `UnitInfo` across `UnitEnv`, we introduce a new datatype called `ExternalUnitDatabases`. It primarily serves as an in-memory representation of *all* `UnitDatabase`s across `UnitEnv`. This means, if multiple `HomeUnitEnv`s depend on the same database, one way or another, we make sure that we don't parse from disk every time. Instead, we store the in-memory representation in `ExternalUnitDatabases`. `ExternalUnitDatabaseCache` is the equivalent of `ExternalUnitState` in the `UnitEnv`. It is a mutable variable wrapping `ExternalUnitDatabases`. The mutable `ExternalUnitDatabaseCache` is used in `initUnits` to make sure we don't parse the same unit database multiple times. Almost by accident, we change the semantics of `initUnits` to honour modifications to `packageDBFlags`. The inability to change `packageDBFlags` while also reusing the already parsed `UnitDatabase`s was reported in #26423 as a bug. Hence, we think this behaviour change is warranted and acceptable, especially since it comes with a breaking change to the `initUnits` API. Add regression test for #26423 Closes #26423 - - - - - 6cce494a by fendor at 2026-07-27T17:31:05-04:00 Introduce UnitIndex for global external unit caching `UnitInfo`s have been observed to cause a lot of memory usage in #27500. Especially with multiple home units, as the same (external) units are processed from scratch, even though most of the time we end up with exactly the same `UnitInfo`. We introduce a `UnitEnv` global cache that allows us to store external unit information that is used across all `HomeUnitEnv`s. The most important change in this commit is the introduction of the `UnitIndex`. It stores a global mapping of `UnitId` -> `UnitInfo`, and `initUnits` always uses the cached `UnitInfo` entry to populate each `HomeUnitEnv`'s `UnitState`. This allows us to ensure the following property: > Each `UnitInfo` should be alive exactly once in GHC. All `UnitState`s should reference 'UnitInfo's stored in the 'UnitIndex'. This ensured by calling 'initUnits' with the 'UnitIndex'. In addition, the `ExternalUnitDatabases` may also hold a reference to each on-disk representation of `UnitInfo`. This means, we impose an hard upper bound on the number of `UnitInfo`s alive in the GHC session: > The number of alive `UnitInfo`s closure objects must be the > sum of all loaded unit database times two. We add performance regression tests that make sure the number of live `UnitInfo` cannot exceed this threshold. Closes #27500 ------------------------- Metric Decrease: MultiComponentModules MultiComponentModulesRecomp MultiComponentModulesRecomp100 mhu-perf LinkableUsage02 ------------------------- These metrics increases are especially notable, as we are not even sharing anything big but merely the global package database with 50 entries. It shows how careful sharing of `UnitInfo` can improve memory usage. We expect this to be much more notable when the whole cabal package database is shared across multiple home units. `LinkableUsage02` metric decreases on unreg and i386 platform, only. --- Technical details To share the `UnitInfo`s correctly, it is important that we extract the `WireMap` into the `UnitIndex`. At the moment of writing, `WireMap` must be globally the same for all `HomeUnitEnv`s. This is important, as we could otherwise not cache the "fully-resolved" `UnitInfo`, as we don't change the `UnitId` or `unitAbiHash` when resolving wired-in units. Thus, there could be ambiguities, when the `WireMap` is not the same for all `UnitState`s across the `UnitEnv`. We consider a `UnitInfo` fully-resolved, if wired-in units have been updated, the `UnitInfo` has been validated and variables in the unit config, such as `${pkgroot}` have been resolved. Updating the wired-in units requires the `WireMap` to be globally the same. - - - - - f8e3bee9 by Zubin Duggal at 2026-07-27T17:31:49-04:00 testsuite: skip runtime stats tests on debugged compilers Debugged flavours build the boot libraries without optimisation, so the runtime numbers do not match the baselines. - - - - - 1e326770 by Zubin Duggal at 2026-07-27T17:31:50-04:00 testsuite: mark #20706 tests fragile rather than broken Whether the static linux linker issues manifest depends on the host toolchain. - - - - - c0b13cbe by Zubin Duggal at 2026-07-27T17:31:50-04:00 testsuite: exclude libnuma from mostly-static It needs static system libraries (libnuma.a) that many platforms do not ship. Fixes #26914 - - - - - bee1913d by Alan Zimmerman at 2026-07-28T16:42:29-04:00 EPA: ClsInstDecl with decls as [LHsDecl GhcPs] in GhcPs Similar to 4fdfe75731e01dad7d7fa474c2703d0d3965afb1, this commit changes the as-parsed representation of class instance declarations to [LHsDecl GhcPs], and only separates them by type from the renamer onward. This also allows us to remove all the AnnSortKey machinery for exact printing, as it is now no longer needed. - - - - - 72c55eee by Cheng Shao at 2026-07-28T16:43:11-04:00 hadrian: implement and use writeFileAtomic to fix race condition This patch implements `writeFileAtomic` in hadrian and change all invocations of shake non-atomic `writeFile'` to use `writeFileAtomic`, to avoid multiple hadrian concurrent invocations overwriting the same in-tree generated file not in the build root directory. Fixes #27536. Additional notes: - `writeFileChanged`/`writeFileChangedBS` cannot be made atomic since it involves reading the file's older version, so their uses are left alone. It doesn't affect #27536 given their outputs are contained in the build root directory. - It's possible to shrink this patch by only making writes outside the build root directory atomic. But I think it's not worth the effort for fine grained distinction here, and atomic writes within the build root directory should also improve robustness of a hadrian build. - In the longer term we do want to make a ghc build only generate files within the build root directory, though that's a lot of work and outside the scope of this particular bugfix. Co-authored-by: Codex <codex(a)openai.com> - - - - - 46d4f963 by Sylvain Henry at 2026-07-29T06:38:40-04:00 RTS: correctly mark slop bytes when shrinking large arrays (#19048) Correctly mark slop bytes even when profiling is off so that heap census doesn't traverse garbage-collected closures. - - - - - 4762a8bf by Simon Jakobi at 2026-07-29T06:39:23-04:00 Add -XLazyFieldAnnotations (GHC proposal 752) Unbundle the prefix `~` lazy field annotation syntax from StrictData. The new LazyFieldAnnotations extension controls whether `~` is accepted on constructor fields. StrictData (and Strict, transitively) imply the new extension. See https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0752-l…. Closes #24455. Assisted-by: Claude Opus 4.8 - - - - - 0b6dcc84 by Simon Jakobi at 2026-07-29T06:40:04-04:00 testsuite: Relax T24471 residency tolerance T24471 peak residency fluctuates enough on i386 to cause spurious failures. Use the standard residency tolerance while retaining the existing allocation threshold. See https://gitlab.haskell.org/ghc/ghc/-/work_items/24471#note_682303. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 90e95b34 by Cheng Shao at 2026-07-29T06:40:45-04:00 compiler: fix missing top-level procedure labels in cmm dumps This patch fixes missing top-level procedure labels in some intermediate Cmm pass dumps. Fixes #27553. Co-authored-by: Codex <codex(a)openai.com> - - - - - 360a5946 by sheaf at 2026-07-29T06:41:35-04:00 Add some type-family-heavy performance tests FamAppCachePerf stress-tests the performance of lookups in the type family application cache. T27336 is a minimisation extracted from the reported reproducer. SimplCastPerf is a measure of coercion growth due to the simplifier calling mkTransCo without re-optimising the result. - - - - - 3ec9e2b9 by Mike Pilgrem at 2026-07-31T08:21:33-04:00 GHC Guide: Improve docs on response files - - - - - e5b2a1f7 by sheaf at 2026-07-31T08:22:23-04:00 Disable Core Lint for TcPlugin_RewritePerf This is a compiler performance test, but the test source hard-coded -dcore-lint, defeating the measurement. ------------------------- Metric Decrease: TcPlugin_RewritePerf ------------------------- - - - - - 85b10c00 by Alan Zimmerman at 2026-07-31T22:09:47+01:00 EPA: Remove LocatedP from OverlapMode We have type LocatedP = GenLocated SrcSpanAnnP type SrcSpanAnnP = EpAnn AnnPragma As the first step in removing this in favour of LocatedA which only captures location, comments and trailing annotations, we remove it from OverlapMode We do this by moving the AnnPragma into the TTG extension point instead. - - - - - c9a34a00 by Viktor Dukhovni at 2026-08-02T04:34:17-04:00 Fix note typo - - - - - 4f2a21f7 by Andreas Klebinger at 2026-08-02T22:46:46-04:00 Apply oneShot Monad trick to STG LintM - - - - - 21e4b89d by Andreas Klebinger at 2026-08-02T22:46:46-04:00 stgLint: Use a single reader env for read only arguments. - - - - - d415f38a by Alan Zimmerman at 2026-08-02T22:47:27-04:00 EPA: Remove LocatedP from CType The next step of removing use of LocatedP by moving the AnnPragma for CType into its TTG extension point instead. - - - - - 8fc6f882 by Simon Jakobi at 2026-08-05T14:53:41-04:00 testsuite: Don't crash on non-UTF-8 test output read_stdout, read_stderr_for, read_comp_stderr and read_diff decoded strictly (the first three with UTF-8, read_diff with the locale encoding), so a test emitting invalid UTF-8 (binary output, or a crash truncating a multi-byte character) raised UnicodeDecodeError and was reported as a framework failure instead of its actual result. Decode with errors='replace', like read_no_crs and safe_print. Assisted-by: Claude Fable 5 - - - - - 56534866 by Simon Jakobi at 2026-08-05T14:53:41-04:00 testsuite: Colorize the test summary, also in CI The summary headings were plain, and SUMMARY was colored unconditionally, so the escapes also ended up in the file written by --summary-file. Color is now decided per output sink via term_color.colored_if; see the comments in term_color. CI logs are not a tty, but GitLab's log viewer renders ANSI colors, so add --force-colors and pass it in .gitlab/ci.sh. Assisted-by: Claude Opus 5 - - - - - bceb541a by Simon Jakobi at 2026-08-05T14:53:42-04:00 testsuite: Repeat unexpected failure output in the summary Finding out why a test failed meant scrolling back through a possibly very long log to the point where the test ran. The summary now repeats the captured output of unexpected failures, before the statistics, so the most interesting part is at the end of the log (#16720). Output mismatches report their diff instead of the mismatching stream (see Note [Redundant output in test results]). The repeated output is bounded per stream, and skipped altogether beyond MAX_SUMMARY_OUTPUT_TESTS failure blocks. Tests failing identically in several ways share one block. Test results now report a source-relative directory, stable regardless of where the run was started from. Assisted-by: Claude Fable 5 - - - - - 2ab02c57 by Ben Gamari at 2026-08-05T14:54:24-04:00 base: Don't drop exception context in SomeException(toException) For reasons that are lost to time, the implementation of [CLC #200] that was merged inappropriately dropped `ExceptionContext` in the `toException` implementation given to `SomeException`. Fix this infelicity. [CLC #200]: https://github.com/haskell/core-libraries-committee/issues/200 - - - - - 126ce574 by Vladislav Zavialov at 2026-08-05T14:55:05-04:00 Test case for #20902 Starting with GHC 9.14.1 (the first major release to include 51e3ec83), and from point releases GHC 9.10.2 and GHC 9.12.3 (backports cc4470be68 and b30f25591e), all examples in this ticket are handled as expected. - - - - - b14d8d59 by Alan Zimmerman at 2026-08-05T14:55:46-04:00 EPA: Remove LocatedP, last use in WarningTxt The last step of removing LocatedP, by moving the AnnPragma for WarningTxt into its TTG extension point instead. This also allows us to remove LocatedP and SrcSpanAnnP - - - - - 70b58c8f by Vladislav Zavialov at 2026-08-05T14:56:27-04:00 Test cases for #18725 Starting with GHC 9.4 (the first release to include 268efcc9a4), the program in this ticket no longer panics. A standalone kind signature breaks the recursive loop, so the type constructor can be used in a kind within its own group. T18725a checks that this is accepted with the signature present, while T18725b confirms it is still rejected without it. - - - - - b18c8dd5 by Zubin Duggal at 2026-08-06T15:51:01-04:00 hie files: Dump the type table when dumping with -ddump-hie - - - - - f839d0fb by Zubin Duggal at 2026-08-06T15:51:01-04:00 hie files: Take evidence for quantified constraints into account when saving evidence terms to the hie ast Fixes #25709 - - - - - 5753ebaa by Simon Jakobi at 2026-08-06T15:51:43-04:00 testsuite: fix stale paths for the ghc-config build artifacts ghc-config.hs moved from testsuite/mk/ to testsuite/ghc-config/ in 6c7a49139c, but the .gitignore entry and the clean rule still referred to the old location. As a result the compiled ghc-config binary, which boilerplate.mk rebuilds on every make-driven test run, showed up as an untracked file and was never cleaned. Assisted-by: Claude Opus 5 - - - - - 246d4d72 by Simon Peyton Jones at 2026-08-06T15:52:25-04:00 Documentation only ...driven by my investigation of #27591 - - - - - be69e9df by Alan Zimmerman at 2026-08-06T15:53:05-04:00 EPA: Replace AnnPragma with individual types We introduced AnnPragma as a common type for all pragma usages wrapped in LocatedP / SrcSpanAnnP. Now that those are gone, and the AnnPragma moved into the TTG points for the given items, we can ensure that each carries only the annotations it needs. So we remove AnnPragma, and in its place bring in AnnCType AnnWarningTxt AnnOverlap AnnAnnDecl AnnPragSCC - - - - - 0779e12c by Simon Jakobi at 2026-08-07T12:36:11-04:00 Cmm: print unreachable blocks under -dppr-debug (#27368) Unreachable blocks linger in a CmmGraph's block map for most of the Cmm pipeline, but pprCmmGraph only ever printed the blocks reachable from the entry, so dumps looked consistent while the graph was not. Issues like #27368 were hard to debug due to this. pprCmmGraph now appends the stored-but-unreachable blocks under a "// unreachable blocks:" heading when -dppr-debug is on. See Note [unreachable blocks] in GHC.Cmm.Pipeline. Assisted-by: Claude Opus 5 - - - - - 3a0f9a51 by Simon Peyton Jones at 2026-08-07T12:36:54-04:00 Fix three bugs related to required type args and INLINE pragmas * `GHC.Core.Opt.Arity.mkEtaForAllMCo` got the visibility flags back to front, leading to a Lint error (#27557) * The arity in an InlineSaturation is the VisArity not the Arity; the two can differ when we have "required" type arguments. This made the INLINE pragma argument counting go wrong in `makeCorePair` (#27590). * When a simple binding has a type signature, we take special path in `tcPolyCheck`, leading to an outer `AbsBinds` that has no dictionaries, even when the binding is in fact overloaded. That confused the inline-arity computation in `makeCorePair` (#27589). The latter two are fixed using the new function `GHC.HsToCore.Binds.findSatArity`. That actually simplifies the API of `makeCorePair`, which is nice. The first bug is fixed by swapping the visiblity flags in `GHC.Core.Opt.Arity.mkEtaForAllMCo` Getting the INLINE behaviour right led to some perf changes: * Runtime /halved/ on T7954 due to better specialisation * Compile time increased by 6% in T21839c because a bit more inlining happened, as it always should have done. * For some reason compile-time max-bytes-used dropped by 30% on T27336, but only on one build configuration; and it increased on LinkableUsage02 by 6% on another configuration Geometric mean effect on our compile time benchmarks is +0.1%. Metric Decrease: T27336 T7954 Metric Increase: LinkableUsage02 T21839c - - - - - 4f985108 by Vladislav Zavialov at 2026-08-07T17:49:50-04:00 Discard type arguments in tcPatToExpr (#27440, #27583) The builder expression of an implicitly bidirectional pattern synonym must not mention types written in the RHS: * Invisible type arguments led to a panic (#27440) * Required type arguments failed with out-of-scope variables (#27583) Both are now discarded, following the precedent established by pattern signatures (#9867). Discarding type arguments takes some care: a type pattern cannot be told from a value pattern by syntax alone, as the `type` keyword may be omitted. Consider: data T a b c where MkT :: forall a. forall b c -> a -> T a b c pattern P :: x -> T x y z pattern P x = MkT @a (type b) c x In P's right-hand side, `@a` and `type b` are clearly type arguments, but what about `c` and `x`? We can only tell by matching the patterns against MkT's type. So tcPatToExpr now runs in TcM and matches the arguments against the constructor's TyVarBinders using zipPatsBndrs, which is made public for this purpose. The resulting builder is $bP x = MkT _ _ x. See Note [Discarding types in the builder expression]. Test cases: T27440a T27440b T27440c T27440d T27440e T27583a T27583b T27583c T27583d T27583e T27583f T27583g Metric Increase: LinkableUsage02 Metric Decrease: T27336 Assisted-by: Claude Opus 5 - - - - - eb1dcd4d by sheaf at 2026-08-07T17:50:40-04:00 mkWpFun_FRR: fix ordering of coercion composition When the subsumption machinery generates an eta-expansion, we must perform a representation polymorphism check to ensure the lambda binder it introduces has a fixed runtime representation. This is done in GHC.Tc.Utils.mkWpFun_FRR. This check involves composing quite a few coercions, arising from representation-polymorphism checks on both the actual and expected argument types. These coercions are then chained using HsWrapper composition, <.>. The ordering of composition was incorrect, leading to the Core Lint failure reported in #27639. This commit fixes that. Fixes #27639 - - - - - 3a552476 by Simon Jakobi at 2026-08-09T15:20:06-04:00 Word64Map: add compareSize compareSize m c compares the size of a map to an Int, but unlike compare (size m) c it stops traversing the map once the outcome is determined. Based on https://github.com/haskell/containers/pull/1139 Assisted-by: Claude Opus 5 - - - - - 6e2c99d8 by Simon Jakobi at 2026-08-09T15:20:06-04:00 Use a pigeonhole sort for deterministic UniqDFM iteration Deterministic UniqDFM iteration used a list mergesort, allocating O(n log n) cons cells and contributing significantly to compiler allocations (#27459). Use a pigeonhole sort where appropriate, while retaining the mergesort fallback. See Note [Sorting a UDFM] and Note [Cost of deterministic iteration]. The peak_megabytes_allocated increase for LinkableUsage02 is probably due to GC timing noise. See #27613. ------------------------- Metric Decrease: InstanceMatching InstanceMatching1 ManyAlternatives T12707 T13379 T13719 T24471 T27336 T5321FD T5321Fun T783 Metric Increase 'peak_megabytes_allocated': LinkableUsage02 ------------------------- Assisted-by: gpt-5.6-sol via Codex CLI - - - - - a938ab12 by sheaf at 2026-08-09T15:20:48-04:00 Testsuite: don't measure max residency for T27336 We really care more about total allocations for this test, so this commit removes the maximum residency measurement. - - - - - 7d94bb78 by Alan Zimmerman at 2026-08-09T15:21:29-04:00 EPA: Remove LocatedE, replace with LocatedA This gets rid of one more LocatedXXX occurrence - - - - - 9df24b7e by sheaf at 2026-08-10T14:28:30-04:00 hie.yaml: use a polyglot shell/batch script This commit merges hie-bios and hie-bios.bat into a single polyglot script. This avoids Windows users having to manually update hie.yaml in order to be able to use HLS. - - - - - 7f75c588 by Alan Zimmerman at 2026-08-10T14:29:11-04:00 EPA: Remove type parameter from AnnList This is a step towards cutting AnnList down to its core for formatting lists only - - - - - e8d1a0d6 by Bernhard M. Wiedemann at 2026-08-10T21:31:23-04:00 driver: Link object files in a deterministic order The object files handed to the linker come from the HomePackageTable, which is ordered by the order in which modules finished compiling. With -j1 that is the build plan order, with -jN it is whatever the scheduler produced, so the same sources can link to different (but equivalent) binaries. The order reaches the output: .text and .rodata contributions are concatenated in link order, so e.g. building the hdav executable of the DAV package twice, once with -j1 and once with -j4, yields two binaries that differ in ~100kB of section contents. Sort the home modules by module before collecting their linkables, guarded under `Opt_ObjectDeterminism` . Fixes #27612 Signed-off-by: Bernhard M. Wiedemann <bwiedemann(a)suse.de> - - - - - 556db2f3 by sheaf at 2026-08-10T21:32:06-04:00 Reduce SpecConstr threshold in GHC.Tc.Solver.Rewrite As remarked in #27628, this module currently sits on a knife's edge: if the body of 'simplifyArgsWorker' is made even a tiny bit smaller, then SpecConstr suddenly kicks in and causes disastrous reboxing of the LiftingContext argument. To make this less likely to happen, this commit lowers the SpecConstr threshold. - - - - - c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - 9b29d03d by Simon Jakobi at 2026-08-13T21:55:39+02:00 testsuite: Expect length001 failure in nonmoving_thr_sanity length001 relies on an optimization rule to avoid excessive stack use. The nonmoving_thr_sanity way does not enable optimization, so classify its stack overflow as an expected failure, as is already done for the other unoptimized nonmoving ways. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 675c5c9c by Simon Jakobi at 2026-08-13T21:55:39+02:00 testsuite: Omit T22859 in nonmoving threaded ways T22859 checks allocation-limit handlers with output that depends on precise allocation behaviour. The nonmoving threaded ways change where these limits are reached, just as the already-omitted LLVM ways do. Omit these ways instead of treating their incidental output differences as test failures. Assisted-by: gpt-5.6-sol via Codex CLI - - - - - 457d86ba by Simon Jakobi at 2026-08-13T21:55:39+02:00 rts/js: Implement eq_thread, and test Eq/Ord ThreadId (#16761) Since d1f3c63701, Eq ThreadId is implemented via the RTS function eq_thread, but the JS RTS never provided it, so comparing ThreadIds for equality on the JS backend crashed with ReferenceError: h$eq_thread is not defined Like the C implementation, h$eq_thread uses pointer equality: The JS RTS has exactly one thread object per thread. Since previously no test exercised eq_thread directly, this commit adds a test covering equality, its stability across GC, and agreement with Ord. Assisted-by: Claude Fable 5 - - - - - 255f53c2 by Simon Jakobi at 2026-08-13T21:59:23+02:00 testsuite: Make listThreads1 insensitive to the RTS's own threads listThreads1 expected `listThreads` to return exactly [ThreadId 1]. That holds only under a non-threaded RTS. Under a threaded RTS however there are more threads present, so we change the test to simply check that `myThreadId` is present in the list. Assisted-by: Claude Opus 5 - - - - - 383 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - + changelog.d/27532 - + changelog.d/T20363 - + changelog.d/T26423 - + changelog.d/T26716 - + changelog.d/T27368-ppr-unreachable-cmm-blocks.md - + changelog.d/T27440 - + changelog.d/T27455 - + changelog.d/T27557 - + changelog.d/T27583 - + changelog.d/T27589 - + changelog.d/T27639 - + changelog.d/fix-cmm-dump-labels - + changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/lazy-field-annotations - + changelog.d/link-deterministic-order - + changelog.d/unit-index - + changelog.d/warn-defaulted-callstack - compiler/GHC.hs - compiler/GHC/Builtin/Utils.hs - compiler/GHC/Cmm.hs - compiler/GHC/Cmm/Pipeline.hs - compiler/GHC/Core/Class.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Data/Word64Map/Internal.hs - compiler/GHC/Data/Word64Map/Lazy.hs - compiler/GHC/Data/Word64Map/Strict.hs - compiler/GHC/Data/Word64Map/Strict/Internal.hs - compiler/GHC/Driver/Backpack.hs - 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utils/haddock/haddock-api/src/Haddock/Backends/LaTeX.hs - utils/haddock/haddock-api/src/Haddock/Backends/Xhtml/Decl.hs - utils/haddock/haddock-api/src/Haddock/Convert.hs - utils/haddock/haddock-api/src/Haddock/GhcUtils.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/91790b455e1a96f4713d879cb52421… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/91790b455e1a96f4713d879cb52421… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/sjakobi/T27459] 6 commits: Allow rewriting in RuntimeReps for newtype ConPats
by Simon Jakobi (＠sjakobi) 14 Aug '26

14 Aug '26

Simon Jakobi pushed to branch wip/sjakobi/T27459 at Glasgow Haskell Compiler / GHC Commits: c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - 62cc6594 by Simon Jakobi at 2026-08-13T21:41:27+02:00 Enumerate RoughMap unifiers non-deterministically The wildcard case of lookupRM' enumerated potential unifiers with a deterministic fold, which must inspect every entry of rm_known before producing the first element. This defeats the laziness that Note [Matches vs Unifiers] relies on: hot consumers such as matchInstEnv only test whether the unifier list is empty, yet paid for deterministic iteration over the whole map (#27459). Enumerate the unifiers with a new lazy nonDetFoldUDFM instead, so the emptiness test can stop at the first unifier. Matches are still enumerated deterministically. Unifier order is now restored at the error-rendering sites: class-instance overlap errors already sort with fuzzyClsInstCmp, and reportConflictInstErr now picks the reported conflict deterministically. See Note [Matches vs Unifiers]. Test output changes: the lazier enumeration forces fewer candidate types during solving, so fewer interfaces are demand-loaded and the "...plus N instances involving out-of-scope types" counts in ambiguity errors shrink (default-fail05, T10963) — these lists reflect the instance environment as loaded at error-report time and were already load-state-dependent. In implicit-dyn-too, the recompiled QuasiExpr.o is now bit-identical to the original (previously it differed only in unique-derived local symbol names), so the [TH] changed recompilation of QuasiQuote correctly no longer fires. ------------------------- Metric Decrease: InstanceMatching InstanceMatching1 Assisted-by: Claude Fable 5 - - - - - 56 changed files: - + changelog.d/T20363 - changelog.d/fix-heap-census-large-arrays-19048 - compiler/GHC/Core/RoughMap.hs - compiler/GHC/Hs/Pat.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match.hs-boot - compiler/GHC/HsToCore/Match/Constructor.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Instance/Family.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/Name/Env.hs - compiler/GHC/Types/Unique/DFM.hs - docs/index.html.in - docs/users_guide/ghc_config.py.in - docs/users_guide/separate_compilation.rst - docs/users_guide/using.rst - hadrian/src/Rules/Generate.hs - rts/LdvProfile.c - rts/PrimOps.cmm - rts/Printer.c - rts/ProfHeap.c - rts/include/rts/storage/ClosureMacros.h - rts/sm/Sanity.c - rts/sm/Storage.c - testsuite/tests/corelint/T21115b.stderr - testsuite/tests/default/default-fail05.stderr - testsuite/tests/dmdanal/should_compile/T23398.stderr - testsuite/tests/driver/implicit-dyn-too/implicit-dyn-too.stdout - testsuite/tests/ghci/scripts/T10963.stderr - testsuite/tests/numeric/should_compile/T23907.stderr - testsuite/tests/perf/compiler/all.T - testsuite/tests/rep-poly/RepPolyRecordPattern.hs - testsuite/tests/rep-poly/RepPolyRecordPattern.stderr - testsuite/tests/rep-poly/RepPolyRecordUpdate.stderr - testsuite/tests/rep-poly/T20113.stderr - − testsuite/tests/rep-poly/T20363.stderr - − testsuite/tests/rep-poly/T20363_show_co.hs - − testsuite/tests/rep-poly/T20363_show_co.stderr - − testsuite/tests/rep-poly/T20363b.stderr - + testsuite/tests/rep-poly/T20363c.hs - testsuite/tests/rep-poly/all.T - + testsuite/tests/rts/T27585.hs - + testsuite/tests/rts/T27585.stdout - testsuite/tests/rts/all.T - testsuite/tests/simplCore/should_compile/T24229a.stderr - testsuite/tests/simplCore/should_compile/T24229b.stderr - testsuite/tests/simplCore/should_compile/T3717.stderr - testsuite/tests/simplCore/should_compile/T3772.stdout - testsuite/tests/simplCore/should_compile/T4081.stderr - testsuite/tests/simplCore/should_compile/T4908.stderr The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/449e126ac32f447b7b916cdf446ca9… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/449e126ac32f447b7b916cdf446ca9… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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[Git][ghc/ghc][wip/andreask/arm-ffi] 8 commits: cmm dumps: Add machop width info with -dppr-debug for infix ops.
by Andreas Klebinger (＠AndreasK) 14 Aug '26

14 Aug '26

Andreas Klebinger pushed to branch wip/andreask/arm-ffi at Glasgow Haskell Compiler / GHC Commits: 3bf3cfc3 by Andreas Klebinger at 2026-08-13T18:17:46+00:00 cmm dumps: Add machop width info with -dppr-debug for infix ops. - - - - - 1a01ed86 by Andreas Klebinger at 2026-08-13T19:35:35+00:00 CmmLint: Check for unsupported MachOp widths machOpArgReps now maps MachOp + Width to a list of supported argument widths or Nothing if the given operation is not supported at the given width. This allows us to check for nonsensical combinations like FloatToInt at Word16. Similarly we now check that every address is actually wordwidth. - - - - - 193487c6 by Andreas Klebinger at 2026-08-13T19:35:43+00:00 arm64 ncg fixes: Subword ffi results, genCondJump clobbering local vars. Fix subword handling of ffi calls. Our invariants require us to clear the high bits for subword results. We now do so both for unspecified bit casts (MO_CONV_XX) and when taking in results from ffi calls. genCondJump: We used to sign-extend the comparison registers in place which could clobber local variables. Added an assert for correct widths to arm64 backend - - - - - bda8a8c6 by Andreas Klebinger at 2026-08-13T19:35:43+00:00 arm64 ncg: Fix MO_V_Broadcast for non-literals. We now use OpReg instead of OpScalarAsVec as required since we broadcast a gp register. Also adds a test. Fixes #27565. - - - - - 45bf8b75 by Andreas Klebinger at 2026-08-13T19:35:43+00:00 arm64 ncg: Fix subword store/load instructions. We used to read those at 32bit width even for smaller values possibly resulting in invalid memory access. Now we construct the suffix for subword variants based on the instruction format for these. - - - - - 5b91f817 by Andreas Klebinger at 2026-08-13T19:35:43+00:00 arm64 ncg: Subword truncation fixes, bitmask literal overflow fixes. Bitmask immediates: We used to produce invalid assembly if literls were too large, now we truncate based on the target width correctly. Note that bitmasks are still broken for non-W64 widths. This will be fixed in a future commit. arm ncg: Improve subword truncation handling: We now use a small set of helpers to truncate `Register` values rather than truncating immediate `Reg` values which greatly simplifies the code structure. This fixes a great many bugs to do with sign/zero extending subwords or the lack thereof. We now establish the invariant that subword values are zero-extended at every site at which they come into "scope" of the ncg, and rely on the invariant throughout rather than pessimistically inserting redundant extensions in a hodgepodge manner at the use sites of these values. This fixes at least the bugs described in issues #27533, #27430 #27537, #27538, #27539, and #27550. But likely more bugs yet not found. - - - - - ef7c872c by Andreas Klebinger at 2026-08-13T19:35:43+00:00 Add some test cases covering bugs in the arm ncg. * Test for #27430 (subword ffi results) * #27537 - subword conversions * #27538 - subwords used in conditional * #27533 - single byte read - - - - - 92a88f55 by Andreas Klebinger at 2026-08-13T19:37:05+00:00 cmmLint: Lint against MO_FS_Truncate subword use. - - - - - 26 changed files: - + changelog.d/arm_ncg_fixes_T27430 - compiler/GHC/Cmm/Expr.hs - compiler/GHC/Cmm/Lint.hs - compiler/GHC/Cmm/MachOp.hs - compiler/GHC/Cmm/Parser.y - compiler/GHC/CmmToAsm/AArch64/CodeGen.hs - compiler/GHC/CmmToAsm/AArch64/Instr.hs - compiler/GHC/CmmToAsm/AArch64/Ppr.hs - testsuite/tests/cmm/should_compile/Makefile - + testsuite/tests/cmm/should_compile/T27368-ppr-debug.stderr - − testsuite/tests/cmm/should_compile/T27368-ppr-debug.stdout - testsuite/tests/cmm/should_compile/all.T - + testsuite/tests/codeGen/should_run/T27430.hs - + testsuite/tests/codeGen/should_run/T27430.stdout - + testsuite/tests/codeGen/should_run/T27430_c.c - + testsuite/tests/codeGen/should_run/T27533.hs - + testsuite/tests/codeGen/should_run/T27533.stdout - + testsuite/tests/codeGen/should_run/T27533_cmm.cmm - + testsuite/tests/codeGen/should_run/T27537.hs - + testsuite/tests/codeGen/should_run/T27537.stdout - + testsuite/tests/codeGen/should_run/T27538.hs - + testsuite/tests/codeGen/should_run/T27538.stdout - testsuite/tests/codeGen/should_run/all.T - + testsuite/tests/simd/should_run/T27565.hs - + testsuite/tests/simd/should_run/T27565.stdout - testsuite/tests/simd/should_run/all.T Changes: ===================================== changelog.d/arm_ncg_fixes_T27430 ===================================== @@ -0,0 +1,18 @@ +section: compiler +issues: #27430 #27539 #27538 #27537 #27550 #27565 #27533 +mrs: !16255 +synopsis: + A series of fixes to the ARM64 ncg, related to handling of primitive + 8/16bit types and simd. +description: + A series of related fixes to the ncg fixing: + + Fixed sign extension for subword values returned from unsafe ffi calls. + Clarify and lint for invalid conversions of int8/int16 -> float/double conversions. + Fix incorrect clobbering of local variables when comparing signed subword values. + Fix incorrect use of 32bit reads/stores for 8/16bit wide reads/stores. + Fix zero extension on function entry if arguments are passed at word-width + but used at subword-widths. + Fix broadcast# for non-literal arguments (arm64 only). + Fix rare assembler errors caused by overflowing literals, by properly checking + whether a constant is a viable immediate argument. ===================================== compiler/GHC/Cmm/Expr.hs ===================================== @@ -443,6 +443,11 @@ pprExpr platform e CmmLit lit -> pprLit platform lit _other -> pprExpr1 platform e +-- | `op` usually, but `(op[width])` with -dppr-debug +withDebugWidth :: Width -> SDoc -> SDoc +withDebugWidth w doc = + ifPprDebug (parens (doc <> brackets (ppr w))) doc + -- Here's the precedence table from GHC.Cmm.Parser: -- %nonassoc '>=' '>' '<=' '<' '!=' '==' -- %left '|' @@ -465,15 +470,17 @@ pprExpr1 platform e = pprExpr7 platform e infixMachOp1, infixMachOp7, infixMachOp8 :: MachOp -> Maybe SDoc -infixMachOp1 (MO_Eq _) = Just (text "==") -infixMachOp1 (MO_Ne _) = Just (text "!=") -infixMachOp1 (MO_Shl _) = Just (text "<<") -infixMachOp1 (MO_U_Shr _) = Just (text ">>") -infixMachOp1 (MO_U_Ge _) = Just (text ">=") -infixMachOp1 (MO_U_Le _) = Just (text "<=") -infixMachOp1 (MO_U_Gt _) = Just (char '>') -infixMachOp1 (MO_U_Lt _) = Just (char '<') -infixMachOp1 _ = Nothing +infixMachOp1 mop = case mop of + (MO_Eq w) -> Just $ withDebugWidth w (text "==") + (MO_Ne w) -> Just $ withDebugWidth w (text "!=") + (MO_Shl w) -> Just $ withDebugWidth w (text "<<") + (MO_U_Shr w) -> Just $ withDebugWidth w (text ">>") + (MO_U_Ge w) -> Just $ withDebugWidth w (text ">=") + (MO_U_Le w) -> Just $ withDebugWidth w (text "<=") + (MO_U_Gt w) -> Just $ withDebugWidth w (char '>') + (MO_U_Lt w) -> Just $ withDebugWidth w (char '<') + _ -> Nothing + where -- %left '-' '+' pprExpr7 platform (CmmMachOp (MO_Add rep1) [x, CmmLit (CmmInt i rep2)]) | i < 0 @@ -483,8 +490,8 @@ pprExpr7 platform (CmmMachOp op [x,y]) = pprExpr7 platform x <+> doc <+> pprExpr8 platform y pprExpr7 platform e = pprExpr8 platform e -infixMachOp7 (MO_Add _) = Just (char '+') -infixMachOp7 (MO_Sub _) = Just (char '-') +infixMachOp7 (MO_Add w) = Just $ withDebugWidth w (char '+') +infixMachOp7 (MO_Sub w) = Just $ withDebugWidth w (char '-') infixMachOp7 _ = Nothing -- %left '/' '*' '%' @@ -493,9 +500,9 @@ pprExpr8 platform (CmmMachOp op [x,y]) = pprExpr8 platform x <+> doc <+> pprExpr9 platform y pprExpr8 platform e = pprExpr9 platform e -infixMachOp8 (MO_U_Quot _) = Just (char '/') -infixMachOp8 (MO_Mul _) = Just (char '*') -infixMachOp8 (MO_U_Rem _) = Just (char '%') +infixMachOp8 (MO_U_Quot w) = Just $ withDebugWidth w (char '/') +infixMachOp8 (MO_Mul w) = Just $ withDebugWidth w (char '*') +infixMachOp8 (MO_U_Rem w) = Just $ withDebugWidth w (char '%') infixMachOp8 _ = Nothing pprExpr9 :: Platform -> CmmExpr -> SDoc @@ -545,11 +552,11 @@ genMachOp platform mop args infixMachOp :: MachOp -> Maybe SDoc infixMachOp mop = case mop of - MO_And _ -> Just $ char '&' - MO_Or _ -> Just $ char '|' - MO_Xor _ -> Just $ char '^' - MO_Not _ -> Just $ char '~' - MO_S_Neg _ -> Just $ char '-' -- there is no unsigned neg :) + MO_And w -> Just $ withDebugWidth w $ char '&' + MO_Or w -> Just $ withDebugWidth w $ char '|' + MO_Xor w -> Just $ withDebugWidth w $ char '^' + MO_Not w -> Just $ withDebugWidth w $ char '~' + MO_S_Neg w -> Just $ withDebugWidth w $ char '-' -- there is no unsigned neg :) _ -> Nothing -- -------------------------------------------------------------------------- ===================================== compiler/GHC/Cmm/Lint.hs ===================================== @@ -88,8 +88,9 @@ lintCmmBlock labels block -- byte/word mismatches. lintCmmExpr :: CmmExpr -> CmmLint CmmType -lintCmmExpr (CmmLoad expr rep _alignment) = do - _ <- lintCmmExpr expr +lintCmmExpr e@(CmmLoad expr rep _alignment) = do + ty <- lintCmmExpr expr + lintAddrTy e ty -- Disabled, if we have the inlining phase before the lint phase, -- we can have funny offsets due to pointer tagging. -- EZY -- when (widthInBytes (typeWidth rep) >= platformWordSizeInBytes platform) $ @@ -99,11 +100,11 @@ lintCmmExpr expr@(CmmMachOp op args) = do platform <- getPlatform tys <- mapM lintCmmExpr args lintShiftOp op (zip args tys) - let machop_arg_widths = machOpArgReps platform op + let machop_arg_widths_m = machOpArgReps platform op arg_tys = map (cmmExprType platform) args - if map typeWidth arg_tys == machop_arg_widths + if maybe False (\machop_arg_widths -> map typeWidth arg_tys == machop_arg_widths) machop_arg_widths_m then cmmCheckMachOp op args tys - else cmmLintMachOpErr expr arg_tys machop_arg_widths + else cmmLintMachOpErr expr arg_tys machop_arg_widths_m lintCmmExpr (CmmRegOff reg offset) = do let rep = typeWidth (cmmRegType reg) lintCmmExpr (CmmMachOp (MO_Add rep) @@ -112,6 +113,15 @@ lintCmmExpr expr = do platform <- getPlatform return (cmmExprType platform expr) +-- We require every address value to be word-sized since we don't support 32 +-- bit pointers on 64bit platforms. +lintAddrTy :: CmmExpr -> CmmType -> CmmLint () +lintAddrTy e addr_ty = do + p <- getPlatform + -- We don't support any platforms where wordwidth /= ptrWidth currently. + unless (addr_ty `cmmCompatType` bWord p) $ cmmLintErr (text "Non word-width address found in:" <+> pdoc p e) + + -- | Check for obviously out-of-bounds shift operations lintShiftOp :: MachOp -> [(CmmExpr, CmmType)] -> CmmLint () lintShiftOp op [(_, arg_ty), (CmmLit (CmmInt n _), _)] @@ -173,10 +183,10 @@ lintCmmMiddle node = case node of unless (erep `cmmCompatType` reg_ty) $ cmmLintAssignErr (CmmAssign reg expr) erep reg_ty - CmmStore l r _alignment -> do - _ <- lintCmmExpr l - _ <- lintCmmExpr r - return () + CmmStore addr rhs _alignment -> do + addr_ty <- lintCmmExpr addr + _ <- lintCmmExpr rhs + lintAddrTy addr addr_ty CmmUnsafeForeignCall target _formals actuals -> do let lintArg expr = do @@ -279,8 +289,16 @@ addLintInfo info thing = CmmLint $ \platform -> Left err -> Left (hang info 2 err) Right a -> Right a -cmmLintMachOpErr :: CmmExpr -> [CmmType] -> [Width] -> CmmLint a -cmmLintMachOpErr expr argsRep opExpectsRep +cmmLintMachOpErr :: CmmExpr -> [CmmType] -> Maybe [Width] -> CmmLint a +cmmLintMachOpErr expr argsRep Nothing + = do + platform <- getPlatform + cmmLintErr (text "in MachOp application: " $$ + nest 2 (pdoc platform expr) $$ + text "op is using unsupported width" $$ + (text "arguments provide: " <+> ppr argsRep)) + +cmmLintMachOpErr expr argsRep (Just opExpectsRep) = do platform <- getPlatform cmmLintErr (text "in MachOp application: " $$ ===================================== compiler/GHC/Cmm/MachOp.hs ===================================== @@ -142,8 +142,8 @@ data MachOp -- Conversions. Some of these will be NOPs. -- Floating-point conversions use the signed variant. - | MO_SF_Round Width Width -- Signed int -> Float - | MO_FS_Truncate Width Width -- Float -> Signed int + | MO_SF_Round Width Width -- Signed int -> Float, but only W32/W64 inputs + | MO_FS_Truncate Width Width -- Float -> Signed int, only W32/W64 on the int side. | MO_SS_Conv Width Width -- Signed int -> Signed int | MO_UU_Conv Width Width -- unsigned int -> unsigned int | MO_XX_Conv Width Width -- int -> int; puts no requirements on the @@ -565,111 +565,120 @@ comparisonResultRep = bWord -- is it? -- application of a MachOp is "type-correct" by checking that the MachReps of -- its arguments are the same as the MachOp expects. This is used when -- linting a CmmExpr. +-- We also check if the given width is supported at all. But there might be +-- false positives. -machOpArgReps :: Platform -> MachOp -> [Width] +machOpArgReps :: Platform -> MachOp -> Maybe [Width] machOpArgReps platform op = case op of - MO_Add w -> [w,w] - MO_Sub w -> [w,w] - MO_Eq w -> [w,w] - MO_Ne w -> [w,w] - MO_Mul w -> [w,w] - MO_S_MulMayOflo w -> [w,w] - MO_S_Quot w -> [w,w] - MO_S_Rem w -> [w,w] - MO_S_Neg w -> [w] - MO_U_Quot w -> [w,w] - MO_U_Rem w -> [w,w] - - MO_S_Ge w -> [w,w] - MO_S_Le w -> [w,w] - MO_S_Gt w -> [w,w] - MO_S_Lt w -> [w,w] - - MO_U_Ge w -> [w,w] - MO_U_Le w -> [w,w] - MO_U_Gt w -> [w,w] - MO_U_Lt w -> [w,w] - - MO_F_Add w -> [w,w] - MO_F_Sub w -> [w,w] - MO_F_Mul w -> [w,w] - MO_F_Quot w -> [w,w] - MO_F_Neg w -> [w] - MO_F_Min w -> [w,w] - MO_F_Max w -> [w,w] - - MO_FMA _ l w -> [vecwidth l w, vecwidth l w, vecwidth l w] - - MO_F_Eq w -> [w,w] - MO_F_Ne w -> [w,w] - MO_F_Ge w -> [w,w] - MO_F_Le w -> [w,w] - MO_F_Gt w -> [w,w] - MO_F_Lt w -> [w,w] - - MO_And w -> [w,w] - MO_Or w -> [w,w] - MO_Xor w -> [w,w] - MO_Not w -> [w] - MO_Shl w -> [w, wordWidth platform] - MO_U_Shr w -> [w, wordWidth platform] - MO_S_Shr w -> [w, wordWidth platform] - - MO_SS_Conv from _ -> [from] - MO_UU_Conv from _ -> [from] - MO_XX_Conv from _ -> [from] - MO_SF_Round from _ -> [from] - MO_FS_Truncate from _ -> [from] - MO_FF_Conv from _ -> [from] - MO_WF_Bitcast w -> [w] - MO_FW_Bitcast w -> [w] - - MO_V_Shuffle l w _ -> [vecwidth l w, vecwidth l w] - MO_VF_Shuffle l w _ -> [vecwidth l w, vecwidth l w] - - MO_V_Broadcast _ w -> [w] - MO_V_Insert l w -> [vecwidth l w, w, W32] - MO_V_Extract l w -> [vecwidth l w, W32] - MO_VF_Broadcast _ w -> [w] - MO_VF_Insert l w -> [vecwidth l w, w, W32] - MO_VF_Extract l w -> [vecwidth l w, W32] + MO_Add w -> Just [w,w] + MO_Sub w -> Just [w,w] + MO_Eq w -> Just [w,w] + MO_Ne w -> Just [w,w] + MO_Mul w -> Just [w,w] + MO_S_MulMayOflo w -> Just [w,w] + MO_S_Quot w -> Just [w,w] + MO_S_Rem w -> Just [w,w] + MO_S_Neg w -> Just [w] + MO_U_Quot w -> Just [w,w] + MO_U_Rem w -> Just [w,w] + + MO_S_Ge w -> Just [w,w] + MO_S_Le w -> Just [w,w] + MO_S_Gt w -> Just [w,w] + MO_S_Lt w -> Just [w,w] + + MO_U_Ge w -> Just [w,w] + MO_U_Le w -> Just [w,w] + MO_U_Gt w -> Just [w,w] + MO_U_Lt w -> Just [w,w] + + MO_F_Add w -> Just [w,w] + MO_F_Sub w -> Just [w,w] + MO_F_Mul w -> Just [w,w] + MO_F_Quot w -> Just [w,w] + MO_F_Neg w -> Just [w] + MO_F_Min w -> Just [w,w] + MO_F_Max w -> Just [w,w] + + MO_FMA _ l w -> Just [vecwidth l w, vecwidth l w, vecwidth l w] + + MO_F_Eq w -> Just [w,w] + MO_F_Ne w -> Just [w,w] + MO_F_Ge w -> Just [w,w] + MO_F_Le w -> Just [w,w] + MO_F_Gt w -> Just [w,w] + MO_F_Lt w -> Just [w,w] + + MO_And w -> Just [w,w] + MO_Or w -> Just [w,w] + MO_Xor w -> Just [w,w] + MO_Not w -> Just [w] + MO_Shl w -> Just [w, wordWidth platform] + MO_U_Shr w -> Just [w, wordWidth platform] + MO_S_Shr w -> Just [w, wordWidth platform] + + MO_SS_Conv from _ -> Just [from] + MO_UU_Conv from _ -> Just [from] + MO_XX_Conv from _ -> Just [from] + -- Only supports W32/W64 + MO_SF_Round from _w -> onlyW32W64 from + MO_FS_Truncate from to + | to `notElem` [W32, W64] -> Nothing + | otherwise -> onlyW32W64 from + MO_FF_Conv from _ -> onlyW32W64 from + MO_WF_Bitcast w -> onlyW32W64 w + MO_FW_Bitcast w -> onlyW32W64 w + + MO_V_Shuffle l w _ -> Just [vecwidth l w, vecwidth l w] + MO_VF_Shuffle l w _ -> Just [vecwidth l w, vecwidth l w] + + MO_V_Broadcast _ w -> Just [w] + MO_V_Insert l w -> Just [vecwidth l w, w, W32] + MO_V_Extract l w -> Just [vecwidth l w, W32] + MO_VF_Broadcast _ w -> Just [w] + MO_VF_Insert l w -> Just [vecwidth l w, w, W32] + MO_VF_Extract l w -> Just [vecwidth l w, W32] -- SIMD vector indices are always 32 bit - MO_V_Add l w -> [vecwidth l w, vecwidth l w] - MO_V_Sub l w -> [vecwidth l w, vecwidth l w] - MO_V_Mul l w -> [vecwidth l w, vecwidth l w] + MO_V_Add l w -> Just [vecwidth l w, vecwidth l w] + MO_V_Sub l w -> Just [vecwidth l w, vecwidth l w] + MO_V_Mul l w -> Just [vecwidth l w, vecwidth l w] - MO_VS_Neg l w -> [vecwidth l w] - MO_VS_Abs l w -> [vecwidth l w] - MO_VS_Min l w -> [vecwidth l w, vecwidth l w] - MO_VS_Max l w -> [vecwidth l w, vecwidth l w] + MO_VS_Neg l w -> Just [vecwidth l w] + MO_VS_Abs l w -> Just [vecwidth l w] + MO_VS_Min l w -> Just [vecwidth l w, vecwidth l w] + MO_VS_Max l w -> Just [vecwidth l w, vecwidth l w] - MO_VU_Min l w -> [vecwidth l w, vecwidth l w] - MO_VU_Max l w -> [vecwidth l w, vecwidth l w] + MO_VU_Min l w -> Just [vecwidth l w, vecwidth l w] + MO_VU_Max l w -> Just [vecwidth l w, vecwidth l w] -- NOTE: The below is owing to the fact that floats use the SSE registers - MO_VF_Add l w -> [vecwidth l w, vecwidth l w] - MO_VF_Sub l w -> [vecwidth l w, vecwidth l w] - MO_VF_Mul l w -> [vecwidth l w, vecwidth l w] - MO_VF_Quot l w -> [vecwidth l w, vecwidth l w] - MO_VF_Neg l w -> [vecwidth l w] - MO_VF_Abs l w -> [vecwidth l w] - MO_VF_Sqrt l w -> [vecwidth l w] - MO_VF_Min l w -> [vecwidth l w, vecwidth l w] - MO_VF_Max l w -> [vecwidth l w, vecwidth l w] - - MO_V_And l w -> [vecwidth l w, vecwidth l w] - MO_V_Or l w -> [vecwidth l w, vecwidth l w] - MO_V_Xor l w -> [vecwidth l w, vecwidth l w] - MO_VF_And l w -> [vecwidth l w, vecwidth l w] - MO_VF_Or l w -> [vecwidth l w, vecwidth l w] - MO_VF_Xor l w -> [vecwidth l w, vecwidth l w] - - MO_RelaxedRead _ -> [wordWidth platform] - MO_AlignmentCheck _ w -> [w] + MO_VF_Add l w -> Just [vecwidth l w, vecwidth l w] + MO_VF_Sub l w -> Just [vecwidth l w, vecwidth l w] + MO_VF_Mul l w -> Just [vecwidth l w, vecwidth l w] + MO_VF_Quot l w -> Just [vecwidth l w, vecwidth l w] + MO_VF_Neg l w -> Just [vecwidth l w] + MO_VF_Abs l w -> Just [vecwidth l w] + MO_VF_Sqrt l w -> Just [vecwidth l w] + MO_VF_Min l w -> Just [vecwidth l w, vecwidth l w] + MO_VF_Max l w -> Just [vecwidth l w, vecwidth l w] + + MO_V_And l w -> Just [vecwidth l w, vecwidth l w] + MO_V_Or l w -> Just [vecwidth l w, vecwidth l w] + MO_V_Xor l w -> Just [vecwidth l w, vecwidth l w] + MO_VF_And l w -> Just [vecwidth l w, vecwidth l w] + MO_VF_Or l w -> Just [vecwidth l w, vecwidth l w] + MO_VF_Xor l w -> Just [vecwidth l w, vecwidth l w] + + MO_RelaxedRead _ -> Just [wordWidth platform] + MO_AlignmentCheck _ w -> Just [w] where vecwidth l w = widthFromBytes (l * widthInBytes w) + onlyW32W64 w + | w == W64 = Just [w] + | w == W32 = Just [w] + | otherwise = Nothing ----------------------------------------------------------------------------- -- CallishMachOp ===================================== compiler/GHC/Cmm/Parser.y ===================================== @@ -745,6 +745,8 @@ stmt :: { CmmParse () } { doCall $2 [] $4 } | '(' formals ')' '=' 'call' expr '(' exprs0 ')' ';' { doCall $6 $2 $8 } + -- NB: bool_expr most be a *boolean* expression: A comparison machOp or 1/0 word literals. + -- We don't allow arbitrary expressions as conditions (See GHC.Cmm.Lint.checkCond:checkCond, #27543). | 'if' bool_expr cond_likely 'goto' NAME { do l <- lookupLabel $5; cmmRawIf $2 l $3 } | 'if' bool_expr cond_likely '{' body '}' else ===================================== compiler/GHC/CmmToAsm/AArch64/CodeGen.hs ===================================== @@ -356,13 +356,10 @@ type InstrBlock -- data Register = Fixed Format Reg InstrBlock + -- ^ It can be unsafe to clobber the result reg, as it might map to a + -- local variable. | Any Format (Reg -> InstrBlock) - --- | Sometimes we need to change the Format of a register. Primarily during --- conversion. -swizzleRegisterRep :: Format -> Register -> Register -swizzleRegisterRep format (Fixed _ reg code) = Fixed format reg code -swizzleRegisterRep format (Any _ codefn) = Any format codefn + -- ^ A destination the caller decides, prevents redundant moves -- | Grab the Reg for a CmmReg getRegisterReg :: Platform -> CmmReg -> Reg @@ -370,8 +367,9 @@ getRegisterReg :: Platform -> CmmReg -> Reg getRegisterReg _ (CmmLocal (LocalReg u pk)) = RegVirtual $ mkVirtualReg u (cmmTypeFormat pk) -getRegisterReg platform (CmmGlobal reg@(GlobalRegUse mid _)) - = case globalRegMaybe platform mid of +getRegisterReg platform (CmmGlobal reg@(GlobalRegUse mid ty)) + = assert (formatInBytes (cmmTypeFormat ty) >= 4) $ + case globalRegMaybe platform mid of Just reg -> RegReal reg Nothing -> pprPanic "getRegisterReg-memory" (ppr $ CmmGlobal reg) -- By this stage, the only MagicIds remaining should be the @@ -382,11 +380,17 @@ getRegisterReg platform (CmmGlobal reg@(GlobalRegUse mid _)) -- ----------------------------------------------------------------------------- -- General things for putting together code sequences --- | The dual to getAnyReg: compute an expression into a register, but --- we don't mind which one it is. +-- | Computes the `Register` value into a concrete register, but we can't pick which one. +-- This means the register might be mapped to a global or local variable and +-- we can only mutate the result reg in place if we know the Cmm expression can't +-- refer to local or global variables. getSomeReg :: CmmExpr -> NatM (Reg, Format, InstrBlock) getSomeReg expr = do r <- getRegister expr + someReg r + +someReg :: Register -> NatM (Reg, Format, InstrBlock) +someReg r = case r of Any rep code -> do tmp <- getNewRegNat rep @@ -647,28 +651,38 @@ opRegWidth W16 = W32 -- w opRegWidth W8 = W32 -- w opRegWidth w = pprPanic "opRegWidth" (text "Unsupported width" <+> ppr w) --- Note [Signed arithmetic on AArch64] --- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ --- Handling signed arithmetic on sub-word-size values on AArch64 is a bit --- tricky as Cmm's type system does not capture signedness. While 32-bit values --- are fairly easy to handle due to AArch64's 32-bit instruction variants --- (denoted by use of %wN registers), 16- and 8-bit values require quite some --- care. +-- Note [Subword operations on AArch64] +-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +-- Handling subword operations on AArch64 is a bit tricky. 32-bit values are fairly +-- easy to handle due to AArch64's 32-bit instruction variants. 16- and 8-bit +-- values require quite some care. The platform doesn't provide operations at +-- widths below 32bit. Which means we have to simulate them using wider operations. +-- Signed arithmetic on sub-word-size values on AArch64 is a bit tricky as Cmm's +-- type system does not capture signedness. If we have a 8 bit value the high +-- bits could be sign or zero extended with no easy way to tell. -- --- We handle 16-and 8-bit values by using the 32-bit operations and +-- To work around this handle 16-and 8-bit values by using the 32-bit operations and -- sign-/zero-extending operands and truncate results as necessary. For -- simplicity we maintain the invariant that a register containing a -- sub-word-size value always contains the zero-extended form of that value -- in between operations. -- --- IMPORTANT: this invariant only holds within a single expression tree as --- generated by the NCG (via truncateReg after each sub-word operation). It --- does NOT hold at function entry points or across basic block boundaries, --- because the GHC calling convention does not guarantee that callers --- zero-extend sub-word arguments. Therefore, any operation that is sensitive --- to the upper bits of its input (e.g. unsigned right shift, unsigned --- division) must explicitly zero- or sign-extend its operands rather than --- assuming they are already extended. +-- Concretely we establish this invariant on every input into the function for which +-- we generate code for in the NCG. This means: +-- * Global STG register access +-- * memory reads +-- * function arguments +-- * ffi results +-- * function call results +-- * results from any subexpression +-- +-- This means we can assume the invariant when generated code for expression trees +-- or machops reading local variables, avoiding (some) redundant extensions. But +-- we have to take great care to uphold the invariant when computing new values. +-- +-- We used to do the inverse. Re-establish the invariant for any operation that +-- is sensitive to values in the high bits. But that turned out to produce worse +-- code and wasn't any less likely to result in new bugs in practice. -- -- For instance, consider the program, -- @@ -688,7 +702,10 @@ opRegWidth w = pprPanic "opRegWidth" (text "Unsupported width" <+> ppr w) -- Next we compute `c`: The `%not` requires no extension of its operands, but -- we must still truncate the result back down to 8-bits. Finally the `%shrl` -- requires no extension and no truncate since we can assume that --- `c` is zero-extended (it was produced by a truncateReg in the same block). +-- `c` is zero-extended. +-- +-- Down the line I think the right way to approach this is to operate more over +-- the `Register` type and store sign extension information inside it. -- -- TODO: -- Don't use Width in Operands @@ -925,20 +942,36 @@ getRegister' config plat expr getRegister (CmmLoad e (cmmBits w) NaturallyAligned) CmmMachOp op [e] -> do - (reg, _format, code) <- getSomeReg e + register <- getRegister e + (reg, _format, code) <- someReg register case op of - MO_Not w -> return $ Any (intFormat w) $ \dst -> + -- XX Conversion + -- truncateSubwordRegister: See Note [Subword operations on AArch64]. + MO_XX_Conv from to + | to >= from -> pure $ swizzleRegisterRep register (intFormat to) + | otherwise -> pure $ truncateSubwordRegister to register + + -- truncateSubwordRegister: See Note [Subword operations on AArch64]. + MO_Not w -> return $ truncateSubwordRegister w $ Any (intFormat w) $ \dst -> let w' = opRegWidth w in code `snocOL` - MVN (OpReg w' dst) (OpReg w' reg) `appOL` - truncateReg w' w dst -- See Note [Signed arithmetic on AArch64] + MVN (OpReg w' dst) (OpReg w' reg) + + -- truncateSubwordRegister: See Note [Subword operations on AArch64]. + MO_S_Neg w -> truncateSubwordRegister w <$> do + let op_w = opRegWidth w + (src, _fmt, reg_code) <- someReg $ signExtendRegister w op_w register + pure $ Any (intFormat w) $ \dst -> reg_code `snocOL` (NEG (intFormat w) (OpReg op_w dst) (OpReg op_w src)) - MO_S_Neg w -> negate code w reg MO_F_Neg w -> return $ Any fmt (\dst -> code `snocOL` NEG fmt (OpReg w dst) (OpReg w reg)) where fmt = floatFormat w - MO_SF_Round from to -> return $ Any (floatFormat to) (\dst -> code `snocOL` SCVTF (OpReg to dst) (OpReg from reg)) -- (Signed ConVerT Float) - MO_FS_Truncate from to -> return $ Any (intFormat to) (\dst -> code `snocOL` FCVTZS (OpReg to dst) (OpReg from reg)) -- (float convert (-> zero) signed) + MO_SF_Round from to -> + massert (from >= W32) >> + return $ Any (floatFormat to) (\dst -> code `snocOL` SCVTF (OpReg to dst) (OpReg from reg)) -- (Signed ConVerT Float) + MO_FS_Truncate from to -> + massert (to >= W32) >> + return $ Any (intFormat to) (\dst -> code `snocOL` FCVTZS (OpReg to dst) (OpReg from reg)) -- (float convert (-> zero) signed) -- TODO this is very hacky -- Note, UBFM and SBFM expect source and target register to be of the same size, so we'll use @max from to@ @@ -951,11 +984,8 @@ getRegister' config plat expr MO_FW_Bitcast w -> return $ Any fmt (\dst -> code `snocOL` FMOV fmt (OpReg w dst) (OpReg w reg)) where fmt = intFormat w - -- Conversions - MO_XX_Conv _from to -> swizzleRegisterRep (intFormat to) <$> getRegister e - -- Vector - MO_V_Broadcast l w -> return $ Any fmt (\dst -> code `snocOL` DUP fmt (OpReg vw dst) (OpScalarAsVec w reg)) + MO_V_Broadcast l w -> return $ Any fmt (\dst -> code `snocOL` DUP fmt (OpReg vw dst) (OpReg w reg)) where fmt = VecFormat l (intScalarFormat w) vw = formatToWidth fmt MO_VF_Broadcast l w -> return $ Any fmt (\dst -> code `snocOL` DUP fmt (OpReg vw dst) (OpScalarAsVec w reg)) @@ -1054,26 +1084,13 @@ getRegister' config plat expr toImm W256 = (OpImm (ImmInt 255)) toImm W512 = (OpImm (ImmInt 511)) - -- In the case of 16- or 8-bit values we need to sign-extend to 32-bits - -- See Note [Signed arithmetic on AArch64]. - negate code w reg = do - let w' = opRegWidth w - fmt = intFormat w - (reg', code_sx) <- signExtendReg w w' reg - return $ Any fmt $ \dst -> - code `appOL` - code_sx `snocOL` - NEG fmt (OpReg w' dst) (OpReg w' reg') `appOL` - truncateReg w' w dst - ss_conv from to reg code = let w' = opRegWidth (max from to) - in return $ Any (intFormat to) $ \dst -> - code `snocOL` - SBFM (OpReg w' dst) (OpReg w' reg) (OpImm (ImmInt 0)) (toImm (min from to)) `appOL` - -- At this point an 8- or 16-bit value would be sign-extended + in return $ truncateSubwordRegister to $ Any (intFormat to) $ \dst -> + code `snocOL` + SBFM (OpReg w' dst) (OpReg w' reg) (OpImm (ImmInt 0)) (toImm (min from to)) + -- At this point an 8- or 16-bit value is sign-extended -- to 32-bits. Truncate back down the final width. - truncateReg w' to dst -- Dyadic machops: -- @@ -1090,26 +1107,14 @@ getRegister' config plat expr CmmMachOp (MO_Sub _) [expr'@(CmmReg (CmmGlobal _r)), CmmLit (CmmInt 0 _)] -> getRegister' config plat expr' -- Immediates are handled via `getArithImm` in the generic code path. - CmmMachOp (MO_U_Quot w) [x, y] | w == W8 -> do + CmmMachOp (MO_U_Quot w) [x, y] | w == W8 || w == W16-> do (reg_x, _format_x, code_x) <- getSomeReg x (reg_y, _format_y, code_y) <- getSomeReg y - tmp_x <- getNewRegNat (intFormat w) - tmp_y <- getNewRegNat (intFormat w) - return $ Any (intFormat w) (\dst -> code_x `appOL` code_y `snocOL` annExpr expr (UXTB (OpReg w tmp_x) (OpReg w reg_x)) `snocOL` - (UXTB (OpReg w tmp_y) (OpReg w reg_y)) `snocOL` - (UDIV (OpReg w dst) (OpReg w tmp_x) (OpReg w tmp_y))) - CmmMachOp (MO_U_Quot w) [x, y] | w == W16 -> do - (reg_x, _format_x, code_x) <- getSomeReg x - (reg_y, _format_y, code_y) <- getSomeReg y - tmp_x <- getNewRegNat (intFormat w) - tmp_y <- getNewRegNat (intFormat w) - return $ Any (intFormat w) (\dst -> code_x `appOL` code_y `snocOL` annExpr expr (UXTH (OpReg w tmp_x) (OpReg w reg_x)) `snocOL` - (UXTH (OpReg w tmp_y) (OpReg w reg_y)) `snocOL` - (UDIV (OpReg w dst) (OpReg w tmp_x) (OpReg w tmp_y))) + return $ Any (intFormat w) (\dst -> code_x `appOL` code_y `snocOL` annExpr expr (UDIV (OpReg w dst) (OpReg w reg_x) (OpReg w reg_y))) -- 2. Shifts. x << n, x >> n. -- Sub-word left shifts by a constant: use UBFM (UBFIZ alias) to shift - -- and mask in a single instruction. See Note [Signed arithmetic on AArch64]. + -- and mask in a single instruction. See Note [Subword operations on AArch64]. CmmMachOp (MO_Shl w) [x, (CmmLit (CmmInt n _))] | w == W8, 0 <= n, n < 8 -> do (reg_x, _format_x, code_x) <- getSomeReg x return $ Any (intFormat w) (\dst -> code_x `snocOL` annExpr expr (UBFM (OpReg w dst) (OpReg w reg_x) (OpImm (ImmInteger ((32 - n) `mod` 32))) (OpImm (ImmInteger (7 - n))))) @@ -1126,7 +1131,7 @@ getRegister' config plat expr CmmMachOp (MO_S_Shr w) [x, (CmmLit (CmmInt n _))] | w == W8, 0 <= n, n < 8 -> do (reg_x, _format_x, code_x) <- getSomeReg x return $ Any (intFormat w) (\dst -> code_x `snocOL` annExpr expr (SBFX (OpReg w dst) (OpReg w reg_x) (OpImm (ImmInteger n)) (OpImm (ImmInteger (8-n)))) - `snocOL` (UXTB (OpReg w dst) (OpReg w dst))) -- See Note [Signed arithmetic on AArch64] + `snocOL` (UXTB (OpReg w dst) (OpReg w dst))) -- See Note [Subword operations on AArch64] CmmMachOp (MO_S_Shr w) [x, y] | w == W8 -> do (reg_x, _format_x, code_x) <- getSomeReg x (reg_y, _format_y, code_y) <- getSomeReg y @@ -1135,12 +1140,12 @@ getRegister' config plat expr tmp <- getNewRegNat (intFormat w) return $ Any (intFormat w) (\dst -> code_x `appOL` code_y `snocOL` annExpr expr (SXTB (OpReg w tmp) (OpReg w reg_x)) `snocOL` (ASR (OpReg w dst) (OpReg w tmp) (OpReg w reg_y)) `snocOL` - (UXTB (OpReg w dst) (OpReg w dst))) -- See Note [Signed arithmetic on AArch64] + (UXTB (OpReg w dst) (OpReg w dst))) -- See Note [Subword operations on AArch64] CmmMachOp (MO_S_Shr w) [x, (CmmLit (CmmInt n _))] | w == W16, 0 <= n, n < 16 -> do (reg_x, _format_x, code_x) <- getSomeReg x return $ Any (intFormat w) (\dst -> code_x `snocOL` annExpr expr (SBFX (OpReg w dst) (OpReg w reg_x) (OpImm (ImmInteger n)) (OpImm (ImmInteger (16-n)))) - `snocOL` (UXTH (OpReg w dst) (OpReg w dst))) -- See Note [Signed arithmetic on AArch64] + `snocOL` (UXTH (OpReg w dst) (OpReg w dst))) -- See Note [Subword operations on AArch64] CmmMachOp (MO_S_Shr w) [x, y] | w == W16 -> do (reg_x, _format_x, code_x) <- getSomeReg x (reg_y, _format_y, code_y) <- getSomeReg y @@ -1149,7 +1154,7 @@ getRegister' config plat expr tmp <- getNewRegNat (intFormat w) return $ Any (intFormat w) (\dst -> code_x `appOL` code_y `snocOL` annExpr expr (SXTH (OpReg w tmp) (OpReg w reg_x)) `snocOL` (ASR (OpReg w dst) (OpReg w tmp) (OpReg w reg_y)) `snocOL` - (UXTH (OpReg w dst) (OpReg w dst))) -- See Note [Signed arithmetic on AArch64] + (UXTH (OpReg w dst) (OpReg w dst))) -- See Note [Subword operations on AArch64] CmmMachOp (MO_S_Shr w) [x, (CmmLit (CmmInt n _))] | w == W32 || w == W64 @@ -1182,14 +1187,14 @@ getRegister' config plat expr return $ Any (intFormat w) (\dst -> code_x `snocOL` annExpr expr (LSR (OpReg w dst) (OpReg w reg_x) (OpImm (ImmInteger n)))) -- 3. Logic &&, || - CmmMachOp (MO_And w) [(CmmReg reg), CmmLit (CmmInt n _)] | isAArch64Bitmask (opRegWidth w') (fromIntegral n) -> - return $ Any fmt (\d -> unitOL $ annExpr expr (AND fmt (OpReg w d) (OpReg w' r') (OpImm (ImmInteger n)))) + CmmMachOp (MO_And w) [(CmmReg reg), CmmLit (CmmInt n _)] | Just op_bitmask <- getBitmaskImm n w -> + return $ Any fmt (\d -> unitOL $ annExpr expr (AND fmt (OpReg w d) (OpReg w' r') op_bitmask)) where fmt = intFormat w w' = formatToWidth (cmmTypeFormat (cmmRegType reg)) r' = getRegisterReg plat reg - CmmMachOp (MO_Or w) [(CmmReg reg), CmmLit (CmmInt n _)] | isAArch64Bitmask (opRegWidth w') (fromIntegral n) -> - return $ Any fmt (\d -> unitOL $ annExpr expr (ORR fmt (OpReg w d) (OpReg w' r') (OpImm (ImmInteger n)))) + CmmMachOp (MO_Or w) [(CmmReg reg), CmmLit (CmmInt n _)] | Just op_bitmask <- getBitmaskImm n w -> + return $ Any fmt (\d -> unitOL $ annExpr expr (ORR fmt (OpReg w d) (OpReg w' r') op_bitmask)) where fmt = intFormat w w' = formatToWidth (cmmTypeFormat (cmmRegType reg)) r' = getRegisterReg plat reg @@ -1220,16 +1225,17 @@ getRegister' config plat expr code_y `appOL` op (OpReg w dst) (OpReg w reg_x) op_y) - -- A (potentially signed) integer operation. + -- A (potentially signed) integer operation that can have immediate arguments. -- In the case of 8- and 16-bit signed arithmetic we must first -- sign-extend both arguments to 32-bits. - -- See Note [Signed arithmetic on AArch64]. - intOpImm :: Bool -> Width -> (Operand -> Operand -> Operand -> OrdList Instr) -> (Integer -> Width -> Maybe Operand) -> NatM (Register) - intOpImm {- is signed -} True w op _encode_imm = intOp True w op - intOpImm False w op encode_imm = do + -- See Note [Subword operations on AArch64]. + intOpImm :: Bool -> SetsHighBits -> Width -> (Operand -> Operand -> Operand -> OrdList Instr) -> (Integer -> Width -> Maybe Operand) -> NatM (Register) + intOpImm {- is signed -} True trunc w op _encode_imm = intOp True trunc w op + intOpImm False trunc w op encode_imm = maintainHighBits trunc w <$> do -- compute x<m> <- x -- compute x<o> <- y -- <OP> x<n>, x<m>, x<o> + let w' = opRegWidth w (reg_x, format_x, code_x) <- getSomeReg x (op_y, format_y, code_y) <- case y of CmmLit (CmmInt n w) @@ -1241,40 +1247,29 @@ getRegister' config plat expr massertPpr (isIntFormat format_x && isIntFormat format_y) $ text "intOp: non-int" -- This is the width of the registers on which the operation -- should be performed. - let w' = opRegWidth w return $ Any (intFormat w) $ \dst -> code_x `appOL` code_y `appOL` - op (OpReg w' dst) (OpReg w' reg_x) (op_y) `appOL` - truncateReg w' w dst -- truncate back to the operand's original width + op (OpReg w' dst) (OpReg w' reg_x) (op_y) -- A (potentially signed) integer operation. -- In the case of 8- and 16-bit signed arithmetic we must first -- sign-extend both arguments to 32-bits. - -- See Note [Signed arithmetic on AArch64]. - intOp is_signed w op = do + -- See Note [Subword operations on AArch64]. + intOp is_signed clean_highbits w op = maintainHighBits clean_highbits w <$> do -- compute x<m> <- x -- compute x<o> <- y -- <OP> x<n>, x<m>, x<o> - (reg_x, format_x, code_x) <- getSomeReg x - (reg_y, format_y, code_y) <- getSomeReg y + let op_w = opRegWidth w + let setHighBits = if is_signed then signExtendRegister w (opRegWidth w) else id + (reg_x_sx, format_x, code_x) <- someReg =<< setHighBits <$> getRegister x + (reg_y_sx, format_y, code_y) <- someReg =<< setHighBits <$> getRegister y massertPpr (isIntFormat format_x && isIntFormat format_y) $ text "intOp: non-int" - -- This is the width of the registers on which the operation - -- should be performed. - let w' = opRegWidth w - signExt r - | not is_signed = return (r, nilOL) - | otherwise = signExtendReg w w' r - (reg_x_sx, code_x_sx) <- signExt reg_x - (reg_y_sx, code_y_sx) <- signExt reg_y + return $ Any (intFormat w) $ \dst -> code_x `appOL` code_y `appOL` - -- sign-extend both operands - code_x_sx `appOL` - code_y_sx `appOL` - op (OpReg w' dst) (OpReg w' reg_x_sx) (OpReg w' reg_y_sx) `appOL` - truncateReg w' w dst -- truncate back to the operand's original width + op (OpReg op_w dst) (OpReg op_w reg_x_sx) (OpReg op_w reg_y_sx) floatOp w op = do (reg_fx, format_x, code_fx) <- getFloatReg x @@ -1465,9 +1460,9 @@ getRegister' config plat expr case op of -- Integer operations -- Add/Sub should only be Integer Options. - MO_Add w -> intOpImm False w (\d x y -> unitOL $ annExpr expr (ADD (intFormat w) d x y)) getArithImm + MO_Add w -> intOpImm False UnknownHighBits w (\d x y -> unitOL $ annExpr expr (ADD (intFormat w) d x y)) getArithImm -- TODO: Handle sub-word case - MO_Sub w -> intOpImm False w (\d x y -> unitOL $ annExpr expr (SUB (intFormat w) d x y)) getArithImm + MO_Sub w -> intOpImm False UnknownHighBits w (\d x y -> unitOL $ annExpr expr (SUB (intFormat w) d x y)) getArithImm -- Note [CSET] -- ~~~~~~~~~~~ @@ -1513,9 +1508,9 @@ getRegister' config plat expr MO_Ne w -> bitOpImm w (\d x y -> toOL [ CMP x y, CSET d NE ]) getArithImm -- Signed multiply/divide - MO_Mul w -> intOp True w (\d x y -> unitOL $ MUL (intFormat w) d x y) + MO_Mul w -> intOp True UnknownHighBits w (\d x y -> unitOL $ MUL (intFormat w) d x y) MO_S_MulMayOflo w -> do_mul_may_oflo w x y - MO_S_Quot w -> intOp True w (\d x y -> unitOL $ SDIV (intFormat w) d x y) + MO_S_Quot w -> intOp True UnknownHighBits w (\d x y -> unitOL $ SDIV (intFormat w) d x y) -- No native rem instruction. So we'll compute the following -- Rd <- Rx / Ry | 2 <- 7 / 3 -- SDIV Rd Rx Ry @@ -1525,24 +1520,24 @@ getRegister' config plat expr -- '--------------------------' -- Note the swap in Rx and Ry. MO_S_Rem w -> withTempIntReg w $ \t -> - intOp True w (\d x y -> toOL [ SDIV (intFormat w) t x y, MSUB d t y x ]) + intOp True UnknownHighBits w (\d x y -> toOL [ SDIV (intFormat w) t x y, MSUB d t y x ]) -- Unsigned multiply/divide - MO_U_Quot w -> intOp False w (\d x y -> unitOL $ UDIV d x y) + MO_U_Quot w -> intOp False CleanHighBits w (\d x y -> unitOL $ UDIV d x y) MO_U_Rem w -> withTempIntReg w $ \t -> - intOp False w (\d x y -> toOL [ UDIV t x y, MSUB d t y x ]) + intOp False CleanHighBits w (\d x y -> toOL [ UDIV t x y, MSUB d t y x ]) -- Signed comparisons -- see Note [CSET] - MO_S_Ge w -> intOp True w (\d x y -> toOL [ CMP x y, CSET d SGE ]) - MO_S_Le w -> intOp True w (\d x y -> toOL [ CMP x y, CSET d SLE ]) - MO_S_Gt w -> intOp True w (\d x y -> toOL [ CMP x y, CSET d SGT ]) - MO_S_Lt w -> intOp True w (\d x y -> toOL [ CMP x y, CSET d SLT ]) + MO_S_Ge w -> intOp True CleanHighBits w (\d x y -> toOL [ CMP x y, CSET d SGE ]) + MO_S_Le w -> intOp True CleanHighBits w (\d x y -> toOL [ CMP x y, CSET d SLE ]) + MO_S_Gt w -> intOp True CleanHighBits w (\d x y -> toOL [ CMP x y, CSET d SGT ]) + MO_S_Lt w -> intOp True CleanHighBits w (\d x y -> toOL [ CMP x y, CSET d SLT ]) -- Unsigned comparisons - MO_U_Ge w -> intOpImm False w (\d x y -> toOL [ CMP x y, CSET d UGE ]) getArithImm - MO_U_Le w -> intOpImm False w (\d x y -> toOL [ CMP x y, CSET d ULE ]) getArithImm - MO_U_Gt w -> intOpImm False w (\d x y -> toOL [ CMP x y, CSET d UGT ]) getArithImm - MO_U_Lt w -> intOpImm False w (\d x y -> toOL [ CMP x y, CSET d ULT ]) getArithImm + MO_U_Ge w -> intOpImm False CleanHighBits w (\d x y -> toOL [ CMP x y, CSET d UGE ]) getArithImm + MO_U_Le w -> intOpImm False CleanHighBits w (\d x y -> toOL [ CMP x y, CSET d ULE ]) getArithImm + MO_U_Gt w -> intOpImm False CleanHighBits w (\d x y -> toOL [ CMP x y, CSET d UGT ]) getArithImm + MO_U_Lt w -> intOpImm False CleanHighBits w (\d x y -> toOL [ CMP x y, CSET d ULT ]) getArithImm -- Floating point arithmetic MO_F_Add w -> floatOp w (\d x y -> unitOL $ ADD (floatFormat w) d x y) @@ -1570,9 +1565,9 @@ getRegister' config plat expr MO_And w -> bitOpImm w (\d x y -> unitOL $ AND (intFormat w) d x y) getBitmaskImm MO_Or w -> bitOpImm w (\d x y -> unitOL $ ORR (intFormat w) d x y) getBitmaskImm MO_Xor w -> bitOpImm w (\d x y -> unitOL $ EOR (intFormat w) d x y) getBitmaskImm - MO_Shl w -> intOp False w (\d x y -> unitOL $ LSL d x y) - MO_U_Shr w -> intOp False w (\d x y -> unitOL $ LSR d x y) - MO_S_Shr w -> intOp True w (\d x y -> unitOL $ ASR d x y) + MO_Shl w -> intOp False UnknownHighBits w (\d x y -> unitOL $ LSL d x y) + MO_U_Shr w -> intOp False CleanHighBits w (\d x y -> unitOL $ LSR d x y) + MO_S_Shr w -> intOp True UnknownHighBits w (\d x y -> unitOL $ ASR d x y) -- Vector operations MO_V_Add l w -> intVecOp l w (\fmt d x y -> unitOL $ ADD fmt d x y) @@ -1630,7 +1625,7 @@ getRegister' config plat expr _ -> pprPanic "Unsupported offset" (pdoc platform y) (reg_x, format_x, code_x) <- getSomeReg x massertPpr (isVecFormat format_x) $ text "MO_V_Extract: non-vector" - -- Always use UMOV. See Note [Signed arithmetic on AArch64] + -- Always use UMOV. See Note [Subword operations on AArch64] return $ Any format (\dst -> code_x `snocOL` UMOV (OpReg w dst) (OpVecLane w reg_x index)) MO_VF_Extract l w -> do @@ -1759,7 +1754,7 @@ getRegister' config plat expr tmp <- getNewRegNat format return $ Any format $ \dst -> code_x `appOL` code_y `appOL` - if dst == reg_y + if dst == reg_y --unlike MO_V_Insert here y/dst can overlap. then toOL [ MOV (OpReg W128 tmp) (OpReg W128 reg_x) , INS format (OpVecLane w tmp index) (OpScalarAsVec w reg_y) , MOV (OpReg W128 dst) (OpReg W128 tmp) @@ -1886,36 +1881,87 @@ isAArch64Bitmask width n = hasOneRun m = 64 == popCount m + countLeadingZeros m + countTrailingZeros m +-------------------------------------------------------------------------------- +-- Helpers to help enforcing Note [Subword operations on AArch64] +-------------------------------------------------------------------------------- + -- | Instructions to sign-extend the value in the given register from width @w@ -- up to width @w'@. -signExtendReg :: Width -> Width -> Reg -> NatM (Reg, OrdList Instr) -signExtendReg w w' r = - case w of - W64 -> noop - W32 - | w' == W32 -> noop - | otherwise -> extend SXTW - W16 -> extend SXTH - W8 -> extend SXTB - _ -> panic "intOp" +signExtendInstr :: Width -> Width -> Reg -> Maybe (Reg -> Instr) +signExtendInstr w w' r = + case (w,w') of + (W64,_) -> Nothing + (W32,W32) -> Nothing + (W32,_) -> extend SXTW + (W16,_) -> extend SXTH + (W8 ,_) -> extend SXTB + _ -> panic "signExtendInstr:unexpectedWidth" + where + extend instr = Just $ \r' -> instr (OpReg w' r') (OpReg w r) + +-- | Sign extend the register if needed, otherwise use register as-is +signExtendRegister :: Width -> Width -> Register -> Register +signExtendRegister w w' register = case register of + Fixed _fmt reg code -> + maybe register + (\instr_ext -> Any (intFormat w') (\dst -> code `snocOL` instr_ext dst) ) + (signExtendInstr w w' reg) + Any _fmt code -> + Any (intFormat w') $ \dst -> + maybe (code dst) + (\instr_ext -> code dst `snocOL` instr_ext dst) + (signExtendInstr w w' dst) + +truncSubwordRegInstr :: Width -> Reg -> Maybe (Reg -> Instr) +truncSubwordRegInstr w_to r = + case w_to of + -- Asserted false, but be defensive for non-debug builds. + W64 -> Nothing + W32 -> Nothing + + -- Actual truncation + W16 -> trunc W32 UXTH + W8 -> trunc W32 UXTB + _ -> panic "truncateSubwordReg:unexpectedWidth" where - noop = return (r, nilOL) - extend instr = do - r' <- getNewRegNat (intFormat w') - return (r', unitOL $ instr (OpReg w' r') (OpReg w r)) - --- | Instructions to truncate the value in the given register from width @w@ --- down to width @w'@. -truncateReg :: Width -> Width -> Reg -> OrdList Instr -truncateReg w w' r = - case w of + trunc w instr = do + Just $ \r' -> instr (OpReg w r') (OpReg w r) + +-- | Like @truncateSubwordRegister@, but modifes the given argument register in place if we +-- need to truncate. +truncateSubwordRegInplace :: Width -> Reg -> OrdList Instr +truncateSubwordRegInplace w_to r = do + case w_to of W64 -> nilOL - W32 - | w' == W32 -> nilOL - _ -> unitOL $ UBFM (OpReg w r) - (OpReg w r) - (OpImm (ImmInt 0)) - (OpImm $ ImmInt $ widthInBits w' - 1) + W32 -> nilOL + W16 -> trunc UXTH + W8 -> trunc UXTB + _ -> panic "truncateSubwordRegInplace:unexpectedWidth" + where + trunc instr = do + unitOL $ instr (OpReg W32 r) (OpReg W32 r) + +-- | Zeros the high words of the value represented by Register if needed according to +-- Note [Subword operations on AArch64] +truncateSubwordRegister :: Width -> Register -> Register +truncateSubwordRegister w register = case register of + Fixed _fmt reg code -> + maybe (swizzleRegisterRep register (intFormat w)) + (\r_instr -> Any (intFormat w) (\dst -> code `snocOL` r_instr dst)) + (truncSubwordRegInstr w reg) + Any _fmt code -> Any (intFormat w) $ \dst -> + maybe (code dst) (\r_inst -> code dst `snocOL` r_inst dst) (truncSubwordRegInstr w dst) + +data SetsHighBits = UnknownHighBits | CleanHighBits + +maintainHighBits :: SetsHighBits -> Width -> Register -> Register +maintainHighBits CleanHighBits _w x = x +maintainHighBits UnknownHighBits w x = truncateSubwordRegister w x + +-- Reinterpret the value in the register as different format. +swizzleRegisterRep :: Register -> Format -> Register +swizzleRegisterRep (Fixed _ reg code) format = Fixed format reg code +swizzleRegisterRep (Any _ codefn) format = Any format codefn -- ----------------------------------------------------------------------------- -- The 'Amode' type: Memory addressing modes passed up the tree. @@ -2038,27 +2084,24 @@ genCondJump bid expr = do -- Generic case. CmmMachOp mop [x, y] -> do - let ubcond w cmp = do - -- compute both sides. - (reg_x, _format_x, code_x) <- getSomeReg x - (reg_y, _format_y, code_y) <- getSomeReg y - let x' = OpReg w reg_x - y' = OpReg w reg_y - return $ case w of - W8 -> code_x `appOL` code_y `appOL` toOL [ UXTB x' x', UXTB y' y', CMP x' y', (annExpr expr (BCOND cmp (TBlock bid))) ] - W16 -> code_x `appOL` code_y `appOL` toOL [ UXTH x' x', UXTH y' y', CMP x' y', (annExpr expr (BCOND cmp (TBlock bid))) ] - _ -> code_x `appOL` code_y `appOL` toOL [ CMP x' y', (annExpr expr (BCOND cmp (TBlock bid))) ] - - sbcond w cmp = do - -- compute both sides. - (reg_x, _format_x, code_x) <- getSomeReg x - (reg_y, _format_y, code_y) <- getSomeReg y + let icond is_signed w cmp = do + -- zero or sign extend the argument register(s) + let extend reg = + if is_signed + then someReg $ signExtendRegister w (opRegWidth w) reg + else someReg $ truncateSubwordRegister w reg + + (reg_x, _format_x, code_x) <- extend =<< getRegister x + (reg_y, _format_y, code_y) <- extend =<< getRegister y + let x' = OpReg w reg_x y' = OpReg w reg_y - return $ case w of - W8 -> code_x `appOL` code_y `appOL` toOL [ SXTB x' x', SXTB y' y', CMP x' y', (annExpr expr (BCOND cmp (TBlock bid))) ] - W16 -> code_x `appOL` code_y `appOL` toOL [ SXTH x' x', SXTH y' y', CMP x' y', (annExpr expr (BCOND cmp (TBlock bid))) ] - _ -> code_x `appOL` code_y `appOL` toOL [ CMP x' y', (annExpr expr (BCOND cmp (TBlock bid))) ] + + return $ concatOL [code_x, code_y, + toOL [CMP x' y', (annExpr expr (BCOND cmp (TBlock bid)))]] + + let ubcond w cmp = icond False w cmp + sbcond w cmp = icond True w cmp fbcond w cmp = do -- ensure we get float regs @@ -2327,32 +2370,27 @@ genCCall target dest_regs arg_regs = do , [src_a, src_b] <- arg_regs , [dst_needed, dst_hi, dst_lo] <- dest_regs -> do - (reg_a', _format_x, code_a) <- getSomeReg src_a - (reg_b', _format_y, code_b) <- getSomeReg src_b + -- Sign-extend inputs to W32 for SMULL (Xd = Wn * Wm). + -- sign extension always allocates a fresh temp for w < W32, + -- and is a noop for W32 (safe: SMULL reads both sources + -- atomically before writing the destination). + (reg_a, _format_x, code_a) <- someReg =<< signExtendRegister w W32 <$> getRegister src_a + (reg_b, _format_y, code_b) <- someReg =<< signExtendRegister w W32 <$> getRegister src_b let lo = getRegisterReg platform (CmmLocal dst_lo) hi = getRegisterReg platform (CmmLocal dst_hi) nd = getRegisterReg platform (CmmLocal dst_needed) w' = platformWordWidth platform - -- Sign-extend inputs to W32 for SMULL (Xd = Wn * Wm). - -- signExtendReg always allocates a fresh temp for w < W32, - -- and is a noop for W32 (safe: SMULL reads both sources - -- atomically before writing the destination). - (reg_a, code_a') <- signExtendReg w W32 reg_a' - (reg_b, code_b') <- signExtendReg w W32 reg_b' - return $ code_a `appOL` - code_b `appOL` - code_a' `appOL` - code_b' `snocOL` + code_b `snocOL` -- SMULL Xd, Wn, Wm: multiply two W32 values producing a -- 64-bit result. The low w bits of lo contain the truncated -- product, and hi gets the overflow (sign extension bits). SMULL (OpReg w' lo) (OpReg W32 reg_a) (OpReg W32 reg_b) `snocOL` ASR (OpReg w' hi) (OpReg w' lo) (OpImm (ImmInt $ widthInBits w)) `appOL` - truncateReg w' w lo `snocOL` + truncateSubwordRegInplace w lo `snocOL` -- CMN (compare negative) tests hi + lo' == 0, i.e. hi == -lo'. -- lo' = LSR(lo, w-1) gives 1 if lo is negative, 0 if positive. -- No overflow iff hi is the sign extension of lo: @@ -2362,7 +2400,7 @@ genCCall target dest_regs arg_regs = do -- NE to set nd = 1 when overflow occurred. CMN (OpReg w' hi) (OpRegShift w' lo SLSR (widthInBits w - 1)) `snocOL` CSET (OpReg w' nd) NE `appOL` - truncateReg w' w hi + truncateSubwordRegInplace w hi -- Can't handle > 64 bit operands | otherwise -> unsupported (MO_S_Mul2 w) PrimTarget (MO_U_Mul2 w) @@ -2385,7 +2423,7 @@ genCCall target dest_regs arg_regs = do ) -- For sizes < platform width, we can just perform a multiply and shift -- Need to be careful to truncate the low half, but the upper half should be - -- be ok if the invariant in [Signed arithmetic on AArch64] is maintained. + -- be ok if the invariant in Note [Subword operations on AArch64] is maintained. -- Currently this case can't be produced by the compiler since -- timesWord2# :: Word# -> Word# -> (# Word#, Word# #) -- TODO: Remove? Or would the extra primop be useful for avoiding the extra @@ -2412,7 +2450,7 @@ genCCall target dest_regs arg_regs = do (OpImm (ImmInt $ widthInBits w)) -- lsb (OpImm (ImmInt $ widthInBits w)) -- width to extract `appOL` - truncateReg W64 w lo + truncateSubwordRegInplace w lo ) | otherwise -> unsupported (MO_U_Mul2 w) PrimTarget (MO_Clz w) @@ -2730,6 +2768,7 @@ genCCall target dest_regs arg_regs = do | [p_reg, val_reg] <- arg_regs -> do (p, _fmt_p, code_p) <- getSomeReg p_reg (val, fmt_val, code_val) <- getSomeReg val_reg + massert (fmt_val == intFormat w) let instr = case ord of MemOrderRelaxed -> STR _ -> STLR @@ -2845,6 +2884,7 @@ genCCall target dest_regs arg_regs = do W16 -> SXTH (OpReg W64 gpReg) (OpReg w r) _ -> panic "impossible" | otherwise + -- Relies on Note [Subword operations on AArch64] = MOV (OpReg w gpReg) (OpReg w r) accumCode' = accumCode `appOL` code_r `snocOL` @@ -2898,6 +2938,7 @@ genCCall target dest_regs arg_regs = do passArguments _ _ _ _ _ _ _ = pprPanic "passArguments" (text "invalid state") + -- readResults gpArgs fpArgs dest_regs reg_acc code_acc readResults :: [Reg] -> [Reg] -> [LocalReg] -> [Reg]-> InstrBlock -> NatM (InstrBlock) readResults _ _ [] _ accumCode = return accumCode readResults [] _ _ _ _ = do @@ -2915,7 +2956,14 @@ genCCall target dest_regs arg_regs = do r_dst = getRegisterReg platform (CmmLocal dst) if isFloatFormat format || isVecFormat format then readResults (gpReg:gpRegs) fpRegs dsts (fpReg:accumRegs) (accumCode `snocOL` MOV (OpReg w r_dst) (OpReg w fpReg)) - else readResults gpRegs (fpReg:fpRegs) dsts (gpReg:accumRegs) (accumCode `snocOL` MOV (OpReg w r_dst) (OpReg w gpReg)) + else do + -- Needed, ffi calls can return garbage in high bits. + -- See Note [Subword operations on AArch64] + let !mov_instr = case w of + W8 -> UXTB + W16 -> UXTH + _ -> MOV + readResults gpRegs (fpReg:fpRegs) dsts (gpReg:accumRegs) (accumCode `snocOL` mov_instr (OpReg w r_dst) (OpReg w gpReg)) unaryFloatOp w op arg_reg dest_reg = do platform <- getPlatform ===================================== compiler/GHC/CmmToAsm/AArch64/Instr.hs ===================================== @@ -771,7 +771,8 @@ data Instr | MOVZ Operand Operand | MVN Operand Operand -- rd = ~rn | ORR Format Operand Operand Operand -- rd = rn | op2 - -- Load and stores. + -- Load and stores, we support subwords by picking the subword variant + -- based on the format. -- TODO STR/LDR might want to change to STP/LDP with XZR for the second register. | STR Format Operand Operand -- str Xn, address-mode // Xn -> *addr | STLR Format Operand Operand -- stlr Xn, address-mode // Xn -> *addr ===================================== compiler/GHC/CmmToAsm/AArch64/Ppr.hs ===================================== @@ -569,12 +569,8 @@ pprInstr platform instr = case instr of -- NOTE: GHC may do whacky things where it only load the lower part of an -- address. Not observing the correct size when loading will lead -- inevitably to crashes. - STR _f o1@(OpReg W8 (RegReal (RealRegSingle i))) o2 | i < 32 -> - op2 (text "\tstrb") o1 o2 - STR _f o1@(OpReg W16 (RegReal (RealRegSingle i))) o2 | i < 32 -> - op2 (text "\tstrh") o1 o2 - STR _f o1 o2 -> op2 (text "\tstr") o1 o2 - STLR _f o1 o2 -> op2 (text "\tstlr") o1 o2 + STR f o1 o2 -> op2 (subword_suffix f $ text "\tstr") o1 o2 + STLR f o1 o2 -> op2 (subword_suffix f $ text "\tstlr") o1 o2 LDR _f o1 (OpImm (ImmIndex lbl' off)) | Just (_info, lbl) <- dynamicLinkerLabelInfo lbl' -> let (adrp', ldr') = op_adrp_reloc_dynamic $ pprAsmLabel platform lbl in @@ -622,12 +618,8 @@ pprInstr platform instr = case instr of op_adrp o1 adrp' $$ op_add o1 ldr' - LDR _f o1@(OpReg W8 (RegReal (RealRegSingle i))) o2 | i < 32 -> - op2 (text "\tldrb") o1 o2 - LDR _f o1@(OpReg W16 (RegReal (RealRegSingle i))) o2 | i < 32 -> - op2 (text "\tldrh") o1 o2 - LDR _f o1 o2 -> op2 (text "\tldr") o1 o2 - LDAR _f o1 o2 -> op2 (text "\tldar") o1 o2 + LDR f o1 o2 -> op2 (subword_suffix f $ text "\tldr") o1 o2 + LDAR f o1 o2 -> op2 (subword_suffix f $ text "\tldar") o1 o2 -- 8. Synchronization Instructions ------------------------------------------- DMBISH DmbLoadStore -> line $ text "\tdmb ish" @@ -698,6 +690,12 @@ pprInstr platform instr = case instr of check_off off = if off >= 0 && off <= 4095 then char '#' <> int off else pgmError $ "GHC.CmmToAsm.AArch64.Ppr.check_off : " ++ show off ++ " is out of 12 bit" + -- Some instructions encode subword ops via b/h suffix on the instruction. + -- We handle this here relying on the format rather than the operands. + subword_suffix II8 t = t <> char 'b' + subword_suffix II16 t = t <> char 'h' + subword_suffix _ t = t + pprBcond :: IsLine doc => Cond -> doc pprBcond c = text "b." <> pprCond c ===================================== testsuite/tests/cmm/should_compile/Makefile ===================================== @@ -16,16 +16,3 @@ T16930: T23610: '$(TEST_HC)' $(TEST_HC_OPTS) T23610.cmm -S - -# The three seds below, in order: -# 1. Keep only the "Parsed Cmm" dump, since that is the one stage where the -# unreachable block still exists. -# 2. Rewrite goto targets: their label uniques survive -dsuppress-uniques -# (#21310). -# 3. Drop the "// CmmAssign"-style node annotations, which pprNode emits -# only on DEBUG compilers. -T27368-ppr-debug: - '$(TEST_HC)' $(TEST_HC_OPTS) -c -no-hs-main -ddump-cmm-verbose-by-proc -dppr-debug -dsuppress-uniques -dsuppress-ticks T27368-ppr-debug.cmm 2>&1 \ - | sed -n '/^==* Parsed Cmm/,/^ \}\]/p' \ - | sed 's/goto c[0-9A-Za-z]*/goto _lbl_/g' \ - | sed 's| *// Cmm[A-Za-z]*$$||' ===================================== testsuite/tests/cmm/should_compile/T27368-ppr-debug.stderr ===================================== @@ -0,0 +1,191 @@ + +==================== Parsed Cmm ==================== +[testUnreachable() { // [R1] + { info_tbls: [] + stack_info: arg_space: 8 + } + {offset + c7: // global + _c1::I64 = R1; + //tick src<T27368-ppr-debug.cmm:(6,1)-(19,1)> + if (_c1::I64 (>[W64]) 0) goto c2; else goto c4; + c2: // global + //tick src<T27368-ppr-debug.cmm:(7,14)-(9,3)> + goto c6; + c6: // global + //tick src<T27368-ppr-debug.cmm:17:5-12> + _c1::I64 = _c1::I64 (-[W64]) 1; + R1 = _c1::I64; + call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; + c4: // global + goto c3; + c3: // global + R1 = _c1::I64; + call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; + // unreachable blocks: + c5: // global + //tick src<T27368-ppr-debug.cmm:13:5-13> + _c1::I64 = _c1::I64 (+[W64]) 42; + R1 = _c1::I64; + call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; + } + }] + + + +==================== Post control-flow optimisations (1) ==================== +testUnreachable +{offset + c7: // global + _c1::I64 = R1; + //tick src<T27368-ppr-debug.cmm:(6,1)-(19,1)> + if (_c1::I64 (>[W64]) 0) goto c2; else goto c4; + c2: // global + //tick src<T27368-ppr-debug.cmm:(7,14)-(9,3)> + //tick src<T27368-ppr-debug.cmm:17:5-12> + _c1::I64 = _c1::I64 (-[W64]) 1; + R1 = _c1::I64; + call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; + c4: // global + R1 = _c1::I64; + call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; +} + + + +==================== Post switch plan ==================== +testUnreachable +{offset + c7: // global + _c1::I64 = R1; + //tick src<T27368-ppr-debug.cmm:(6,1)-(19,1)> + if (_c1::I64 (>[W64]) 0) goto c2; else goto c4; + c2: // global + //tick src<T27368-ppr-debug.cmm:(7,14)-(9,3)> + //tick src<T27368-ppr-debug.cmm:17:5-12> + _c1::I64 = _c1::I64 (-[W64]) 1; + R1 = _c1::I64; + call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; + c4: // global + R1 = _c1::I64; + call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; +} + + + +==================== ThreadSanitizer instrumentation ==================== +testUnreachable +{offset + c7: // global + _c1::I64 = R1; + //tick src<T27368-ppr-debug.cmm:(6,1)-(19,1)> + if (_c1::I64 (>[W64]) 0) goto c2; else goto c4; + c2: // global + //tick src<T27368-ppr-debug.cmm:(7,14)-(9,3)> + //tick src<T27368-ppr-debug.cmm:17:5-12> + _c1::I64 = _c1::I64 (-[W64]) 1; + R1 = _c1::I64; + call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; + c4: // global + R1 = _c1::I64; + call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; +} + + + +==================== Layout Stack ==================== +testUnreachable +{offset + c7: // global + _c1::I64 = R1; + //tick src<T27368-ppr-debug.cmm:(6,1)-(19,1)> + if (_c1::I64 (>[W64]) 0) goto c2; else goto c4; + c2: // global + //tick src<T27368-ppr-debug.cmm:(7,14)-(9,3)> + //tick src<T27368-ppr-debug.cmm:17:5-12> + _c1::I64 = _c1::I64 (-[W64]) 1; + R1 = _c1::I64; + call (P64[Sp])(R1) args: 8, res: 0, upd: 8; + c4: // global + R1 = _c1::I64; + call (P64[Sp])(R1) args: 8, res: 0, upd: 8; +} + + + +==================== CAFEnv ==================== +[(c2, {}), (c4, {}), (c7, {})] + + + +==================== after setInfoTableStackMap ==================== +testUnreachable() { // [R1] + { info_tbls: [] + stack_info: arg_space: 8 + } + {offset + c7: // global + _c1::I64 = R1; + //tick src<T27368-ppr-debug.cmm:(6,1)-(19,1)> + if (_c1::I64 (>[W64]) 0) goto c2; else goto c4; + c2: // global + //tick src<T27368-ppr-debug.cmm:(7,14)-(9,3)> + //tick src<T27368-ppr-debug.cmm:17:5-12> + _c1::I64 = _c1::I64 (-[W64]) 1; + R1 = _c1::I64; + call (P64[Sp])(R1) args: 8, res: 0, upd: 8; + c4: // global + R1 = _c1::I64; + call (P64[Sp])(R1) args: 8, res: 0, upd: 8; + } +} + + + +==================== Post control-flow optimisations (2) ==================== +testUnreachable() { // [R1] + { info_tbls: [] + stack_info: arg_space: 8 + } + {offset + c7: // global + _c1::I64 = R1; + //tick src<T27368-ppr-debug.cmm:(6,1)-(19,1)> + if (_c1::I64 (>[W64]) 0) goto c2; else goto c4; + c2: // global + //tick src<T27368-ppr-debug.cmm:(7,14)-(9,3)> + //tick src<T27368-ppr-debug.cmm:17:5-12> + _c1::I64 = _c1::I64 (-[W64]) 1; + R1 = _c1::I64; + call (P64[Sp])(R1) args: 8, res: 0, upd: 8; + c4: // global + R1 = _c1::I64; + call (P64[Sp])(R1) args: 8, res: 0, upd: 8; + } +} + + + +==================== Post CPS Cmm ==================== +[testUnreachable() { // [R1] + { info_tbls: [] + stack_info: arg_space: 8 + } + {offset + c7: // global + _c1::I64 = R1; + //tick src<T27368-ppr-debug.cmm:(6,1)-(19,1)> + if (_c1::I64 (>[W64]) 0) goto c2; else goto c4; + c2: // global + //tick src<T27368-ppr-debug.cmm:(7,14)-(9,3)> + //tick src<T27368-ppr-debug.cmm:17:5-12> + _c1::I64 = _c1::I64 (-[W64]) 1; + R1 = _c1::I64; + call (P64[Sp])(R1) args: 8, res: 0, upd: 8; + c4: // global + R1 = _c1::I64; + call (P64[Sp])(R1) args: 8, res: 0, upd: 8; + } + }] + + ===================================== testsuite/tests/cmm/should_compile/T27368-ppr-debug.stdout deleted ===================================== @@ -1,27 +0,0 @@ -==================== Parsed Cmm ==================== -[testUnreachable() { // [R1] - { info_tbls: [] - stack_info: arg_space: 8 - } - {offset - _lbl_: - __locVar_::I64 = R1; - if (__locVar_::I64 > 0) goto _lbl_; else goto _lbl_; - _lbl_: - goto _lbl_; - _lbl_: - __locVar_::I64 = __locVar_::I64 - 1; - R1 = __locVar_::I64; - call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; - _lbl_: - goto _lbl_; - _lbl_: - R1 = __locVar_::I64; - call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; - // unreachable blocks: - _lbl_: - __locVar_::I64 = __locVar_::I64 + 42; - R1 = __locVar_::I64; - call (P64[(old + 8)])(R1) args: 8, res: 0, upd: 8; - } - }] ===================================== testsuite/tests/cmm/should_compile/all.T ===================================== @@ -13,11 +13,9 @@ test('T20725', normal, compile, ['-package ghc']) test('T23610', normal, makefile_test, ['T23610']) test('T24224', [cmm_src, grep_errmsg(r'(F64.*);', [1]), only_ways(['normal'])], compile, ['-no-hs-main -ddump-cmm -dsuppress-all -dsuppress-uniques']) test('T24474', cmm_src, compile, ['-optc-g3']) -# -dppr-debug makes stored-but-unreachable blocks visible in Cmm dumps (#27368). -# Skipped on wordsize(32) targets, where the dump would say I32/P32, and on -# unregisterised builds, which print call targets with an extra load. -test('T27368-ppr-debug', [when(wordsize(32), skip), when(unregisterised(), skip)], - makefile_test, ['T27368-ppr-debug']) +# Grep for a `... = + .. 42 ..;` occurence from within the dead code block in the cmm dump output. +test('T27368-ppr-debug', [cmm_src, only_ways(['normal']), grep_errmsg(r'\=.*\+.*(42;)', [1])], + compile, ['-no-hs-main -ddump-cmm-verbose-by-proc -dppr-debug']) test('T24474-cmm-gets-c-opts', cmm_src, compile, ['-optc-DFOO']) test('T24474-cmm-opt-order', cmm_src, compile, ['-optc-DFOO ' '-optCmmP-UFOO ' ===================================== testsuite/tests/codeGen/should_run/T27430.hs ===================================== @@ -0,0 +1,44 @@ +{-# LANGUAGE MagicHash #-} + +import GHC.Exts +import Data.Bits +import GHC.Word + +foreign import ccall unsafe "u64_to_u8" u64_to_u8 :: Word64 -> Word8 +foreign import ccall unsafe "u64_to_u16" u64_to_u16 :: Word64 -> Word16 +foreign import ccall unsafe "u64_to_u32" u64_to_u32 :: Word64 -> Word32 + +x :: Word64 +x = 5 + +-- Those should give just x when truncated. +y8,y16,y32 :: Word64 +y8 = setBit x 8 +y16 = setBit x 16 +y32 = setBit x 32 + +eq8 :: Word8 -> Word8 -> Int +eq8 (W8# a) (W8# b) = I# (eqWord8# a b) + +eq16 :: Word16 -> Word16 -> Int +eq16 (W16# a) (W16# b) = I# (eqWord16# a b) + +eq32 :: Word32 -> Word32 -> Int +eq32 (W32# a) (W32# b) = I# (eqWord32# a b) + +{-# NOINLINE outline_eq8 #-} +outline_eq8 = eq8 +{-# NOINLINE outline_eq16 #-} +outline_eq16 = eq16 +{-# NOINLINE outline_eq32 #-} +outline_eq32 = eq32 + +main :: IO () +main = do + print (eq8 (u64_to_u8 x) (u64_to_u8 y8)) + print (eq16 (u64_to_u16 x) (u64_to_u16 y16)) + print (eq32 (u64_to_u32 x) (u64_to_u32 y32)) + + print (outline_eq8 (u64_to_u8 x) (u64_to_u8 y8)) + print (outline_eq16 (u64_to_u16 x) (u64_to_u16 y16)) + print (outline_eq32 (u64_to_u32 x) (u64_to_u32 y32)) ===================================== testsuite/tests/codeGen/should_run/T27430.stdout ===================================== @@ -0,0 +1,6 @@ +1 +1 +1 +1 +1 +1 ===================================== testsuite/tests/codeGen/should_run/T27430_c.c ===================================== @@ -0,0 +1,5 @@ +#include <stdint.h> + +uint8_t u64_to_u8(uint64_t v) { return (uint8_t)v; } +uint16_t u64_to_u16(uint64_t v) { return (uint16_t)v; } +uint32_t u64_to_u32(uint64_t v) { return (uint32_t)v; } ===================================== testsuite/tests/codeGen/should_run/T27533.hs ===================================== @@ -0,0 +1,41 @@ +{-# LANGUAGE MagicHash, UnboxedTuples, GHCForeignImportPrim, UnliftedFFITypes #-} + +import GHC.Exts +import GHC.IO (IO(..)) +import Foreign.Marshal.Alloc (allocaBytes) +import Foreign.Marshal.Utils (fillBytes) +import Foreign.Ptr (Ptr(..)) +import Data.Word (Word8) +import Numeric (showHex) +import System.IO + +foreign import prim "store8" store8# :: Addr# -> Word# +foreign import prim "load8" load8# :: Addr# -> Word# + +-- Read one byte at a given byte offset. Working a byte at a time keeps the +-- test independent of both endianness and word size: the buffer contents are +-- a fixed sequence of bytes in address order, whereas a word-sized read of +-- the same buffer would give 0x..43 on little-endian and 0x43.. on big-endian. +readByte :: Addr# -> Int -> IO Word +readByte a (I# i) = + IO (\s -> case readWord8OffAddr# a i s of + (# s', v #) -> (# s', W# (word8ToWord# v) #)) + +main :: IO () +main = do + hSetBuffering stdout NoBuffering + allocaBytes 8 $ \p@(Ptr a) -> do + -- 1. Silent corruption: release-store of 1 byte into an all-ones buffer. + -- The store must touch byte 0 and leave bytes 1..7 alone; a buggy NCG + -- widens it to a 4-byte store and zeroes bytes 1..3. + fillBytes p (0xFF :: Word8) 8 + case store8# a of _ -> return () -- case on unlifted Word# forces the call + bs <- mapM (readByte a) [0 .. 7] + putStrLn ("after 1-byte release-store: " ++ unwords (map (\b -> showHex b "") bs)) + -- expected 43 ff ff ff ff ff ff ff + -- buggy NCG gives 43 0 0 0 ff ff ff ff + + -- 2. SIGBUS: acquire-load of 1 byte at an odd address (well-defined). + r <- IO (\s -> (# s, W# (load8# (a `plusAddr#` 1#)) #)) + putStrLn ("acquire byte load at p+1: 0x" ++ showHex r "") + -- expected 0xff; buggy NCG dies with SIGBUS before printing ===================================== testsuite/tests/codeGen/should_run/T27533.stdout ===================================== @@ -0,0 +1,2 @@ +after 1-byte release-store: 43 ff ff ff ff ff ff ff +acquire byte load at p+1: 0xff ===================================== testsuite/tests/codeGen/should_run/T27533_cmm.cmm ===================================== @@ -0,0 +1,14 @@ +#include "Cmm.h" + +// Release-store one byte at p. Must touch exactly 1 byte. +store8 (W_ p) { + %release I8[p] = 67 :: I8; + return (0); +} + +// Acquire-load one byte from p. +load8 (W_ p) { + I8 v; + v = %acquire I8[p]; + return (%zx64(v)); +} ===================================== testsuite/tests/codeGen/should_run/T27537.hs ===================================== @@ -0,0 +1,26 @@ +{-# LANGUAGE MagicHash #-} + +import GHC.Exts + +{-# NOINLINE lt8 #-} +lt8 :: Int -> Word -> Int -- ltWord8# 254 255: must be 1 +lt8 (I# m) (W# n) = I# (ltWord8# (int8ToWord8# (intToInt8# m)) (wordToWord8# n)) + +{-# NOINLINE eq8 #-} +eq8 :: Int -> Word -> Int -- eqWord8# 254 254: must be 1 +eq8 (I# m) (W# n) = I# (eqWord8# (int8ToWord8# (intToInt8# m)) (wordToWord8# n)) + +{-# NOINLINE eqi16 #-} +eqi16 :: Int -> Int -> Int -- eqInt16# (-2) (-2): must be 1 +eqi16 (I# m) (I# n) = I# (eqInt16# (intToInt16# m) (word16ToInt16# (wordToWord16# (int2Word# n)))) + +{-# NOINLINE rem8 #-} +rem8 :: Int -> Word -> Word -- remWord8# 254 100: must be 54 +rem8 (I# m) (W# n) = W# (word8ToWord# (remWord8# (int8ToWord8# (intToInt8# m)) (wordToWord8# n))) + +main :: IO () +main = do + print (lt8 (-2) 255) + print (eq8 (-2) 254) + print (eqi16 (-2) 65534) + print (rem8 (-2) 100) ===================================== testsuite/tests/codeGen/should_run/T27537.stdout ===================================== @@ -0,0 +1,4 @@ +1 +1 +1 +54 ===================================== testsuite/tests/codeGen/should_run/T27538.hs ===================================== @@ -0,0 +1,20 @@ +{-# LANGUAGE MagicHash #-} + +import GHC.Exts + +{-# NOINLINE ix #-} +ix :: Int +ix = 0 + +{-# NOINLINE f #-} +f :: Int8# -> Int# +f x = if isTrue# (x `ltInt8#` intToInt8# 0#) + then (int8ToWord8# x) `gtWord8#` wordToWord8# 200## + else 1# + +main :: IO () +main = do + -- Test for use of byte-width read. + let !(I# i) = ix + x = indexInt8OffAddr# "\x80"# i + putStrLn ("f(0x80) = " ++ show (I# (f x))) ===================================== testsuite/tests/codeGen/should_run/T27538.stdout ===================================== @@ -0,0 +1 @@ +f(0x80) = 0 ===================================== testsuite/tests/codeGen/should_run/all.T ===================================== @@ -295,3 +295,12 @@ test('aarch64-sxtw-run', when(unregisterised(), skip)], multi_compile_and_run, ['aarch64-sxtw-run', [('aarch64-sxtw-cmm.cmm', '')], '-O']) + +test('T27430', [req_c, extra_ways(['optasm'])], compile_and_run, ['T27430_c.c']) + +test('T27533', [req_cmm, extra_ways(['optasm'])], multi_compile_and_run, + ['T27533', [('T27533_cmm.cmm', '')], '-O']) + +test('T27537', normal, compile_and_run, ['-O']) + +test('T27538', normal, compile_and_run, ['-O']) ===================================== testsuite/tests/simd/should_run/T27565.hs ===================================== @@ -0,0 +1,36 @@ +{-# LANGUAGE MagicHash, UnboxedTuples #-} +module Main (main) where +import GHC.Exts +import GHC.Int (Int8(..), Int16(..), Int32(..), Int64(..)) + +{-# OPAQUE broadcast_i8 #-} +broadcast_i8 :: Int8# -> Int8X16# +broadcast_i8 x = broadcastInt8X16# x + +{-# OPAQUE broadcast_i16 #-} +broadcast_i16 :: Int16# -> Int16X8# +broadcast_i16 x = broadcastInt16X8# x + +{-# OPAQUE broadcast_i32 #-} +broadcast_i32 :: Int32# -> Int32X4# +broadcast_i32 x = broadcastInt32X4# x + +{-# OPAQUE broadcast_i64 #-} +broadcast_i64 :: Int64# -> Int64X2# +broadcast_i64 x = broadcastInt64X2# x + +main :: IO () +main = do + case unpackInt8X16# (broadcast_i8 (intToInt8# 32#)) of + (# a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12,a13,a14,a15 #) -> + print [ I8# a0, I8# a1, I8# a2, I8# a3, I8# a4, I8# a5, I8# a6, I8# a7 + , I8# a8, I8# a9, I8# a10, I8# a11, I8# a12, I8# a13, I8# a14, I8# a15 ] + case unpackInt16X8# (broadcast_i16 (intToInt16# 32#)) of + (# b0,b1,b2,b3,b4,b5,b6,b7 #) -> + print [ I16# b0, I16# b1, I16# b2, I16# b3, I16# b4, I16# b5, I16# b6, I16# b7 ] + case unpackInt32X4# (broadcast_i32 (intToInt32# 32#)) of + (# c0,c1,c2,c3 #) -> + print [ I32# c0, I32# c1, I32# c2, I32# c3 ] + case unpackInt64X2# (broadcast_i64 (intToInt64# 32#)) of + (# d0,d1 #) -> + print [ I64# d0, I64# d1 ] ===================================== testsuite/tests/simd/should_run/T27565.stdout ===================================== @@ -0,0 +1,4 @@ +[32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32] +[32,32,32,32,32,32,32,32] +[32,32,32,32] +[32,32] ===================================== testsuite/tests/simd/should_run/all.T ===================================== @@ -217,3 +217,5 @@ test('StackAlignment64' , compile_and_run if have_cpu_feature('avx512f') else compile , ['StackAlignment64_main.c'] ) + +test('T27565', [], compile_and_run, ['']) View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/9245b0392e434bce7d9fbb629fa1b0… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/9245b0392e434bce7d9fbb629fa1b0… You're receiving this email because of your account on gitlab.haskell.org. 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[Git][ghc/ghc][wip/marge_bot_batch_merge_job] 8 commits: Allow rewriting in RuntimeReps for newtype ConPats
by Marge Bot (＠marge-bot) 14 Aug '26

14 Aug '26

Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: c77d88fc by sheaf at 2026-08-13T10:15:22-04:00 Allow rewriting in RuntimeReps for newtype ConPats This commit implements PHASE 2 of the FixedRuntimeRep plan described in Note [The Concrete mechanism] in GHC.Tc.Utils.Concrete for newtype constructor patterns. In short, GHC now accepts programs of the form f (MkN x) = ... in which the argument 'x' of the newtype constructor pattern 'MkN x' has a representation that is not syntactically concrete, e.g. it can be 'Id IntRep' reducing to 'IntRep'. See T20363{,b,c} for examples. There are two main parts to the implementation: 1. Typechecking, in GHC.Tc.Gen.Pat.tcDataConPat. See Note [Typechecking newtype constructor patterns] in GHC.Tc.Gen.Pat. 2. Desugaring. We restructure the code for desugaring pattern matches by allowing the scrutinised match variable to be casted. This allows us to accumulate coercions and avoids creating binders at intermediate types tha don't have a fixed RuntimeRep. See the revamped Note [Match Ids] in GHC.HsToCore.Monad. Fixes #20363 ------------------------- Metric Increase: InstanceMatching ------------------------- - - - - - 6ba9dd41 by Wolfgang Jeltsch at 2026-08-13T10:16:07-04:00 Improve the documentation of `--show-iface` This change in particular gets rid of the claim that `--show-iface` writes *the* contents of the interface file in question. It doesn’t do that; it only writes those parts that are likely of interest to a human reader. - - - - - 4bd193fa by Sylvain Henry at 2026-08-13T10:17:00-04:00 RTS: fix LDV profiler's slop skipping (#27585) processHeapForDead was the one heap scanner not updated for the slop marker encoding introduced in #19048. It still assumed slop is zeroed: while (p < bd->free && !*p) p++; // skip slop so it stopped at the (StgWord)(-1) sentinel and passed it to processHeapClosureForDead. IS_FORWARDING_PTR(-1) holds, hence a garbage size was read out of LDVW and the scan ran off the block, tripping ASSERT(p == bd->free) on a debug RTS and silently corrupting the census otherwise. The loop was hand-copied in four places, so factor it out into skipSlop in ClosureMacros.h and use it in ProfHeap.c, Sanity.c, Printer.c and LdvProfile.c. Co-Authored-By: Claude Opus 5 (1M context) <noreply(a)anthropic.com> - - - - - 1446bb03 by Zubin Duggal at 2026-08-13T10:17:48-04:00 hadrian: Fix links to remaining doc sites to not use the package hash for haddock links In 07267f79d91169f474cacc8bcd38d76a6e97887d we changed hadrian to not include the package hash in the haddock directory. This patch takes care of a few remaining links that were missed in that patch Fixes #27671 - - - - - 257c3ed7 by Simon Jakobi at 2026-08-13T10:18:29-04:00 Testsuite: widen InstanceMatching acceptance window to 5% (#27673) ...in order to unblock CI. Assisted-by: Claude Fable 5 - - - - - 7abd196b by Vladislav Zavialov at 2026-08-13T15:34:54-04:00 Increase test coverage of diagnostics, batch 2 Add test cases for the previously untested diagnostics: [GHC-26133] TcRnForeignImportPrimSafeAnn [GHC-68444] SumAltArityExceeded [GHC-63966] IllegalSumAlt [GHC-23882] IllegalDeclaration [GHC-60220] InvalidCCallImpent [GHC-18816] RecGadtNoCons [GHC-38140] GadtNoCons [GHC-37056] InvalidTypeInstanceHeader [GHC-78486] InvalidTyFamInstLHS [GHC-39639] DefaultDataInstDecl [GHC-78822] AssocDefaultNotAssoc [GHC-43510] NotSimpleUnliftedType [GHC-41843] IOResultExpected [GHC-07641] AtLeastOneArgExpected [GHC-52886] InvalidTopDecl Remove unused error constructors: [GHC-92057] ImportLookupAmbiguous - - - - - 41db643e by Simon Jakobi at 2026-08-13T15:34:55-04:00 testsuite: Drop peak_megabytes_allocated from LinkableUsage tests LinkableUsage01/02 collected all metrics with a 2% tolerance. For peak_megabytes_allocated, whose granularity is 1 MB, that window is under 0.7 MB at this test's ~34 MB peak, so any 1 MB step failed the test (#27613, #27489). Drop that metric: max_bytes_used guards the Linkable-retention property with byte granularity, at a tolerance that still comfortably exceeds the noise observed in CI. Assisted-by: Claude Fable 5 - - - - - e98231d7 by Simon Jakobi at 2026-08-13T15:34:55-04:00 testsuite: Don't truncate fractional baselines when computing bounds RelativeMetricAcceptanceWindow.get_bounds truncated the baseline with int() before applying the tolerance. Baselines can be fractional (they are averaged over several measurements), so this skewed the acceptance window downwards: in #27613, a baseline of 33.67 at 2% tolerance yielded bounds (32, 34) instead of (32, 35), rejecting a measurement that was within tolerance. Assisted-by: Claude Fable 5 - - - - - 87 changed files: - + changelog.d/T20363 - changelog.d/fix-heap-census-large-arrays-19048 - compiler/GHC/Hs/Pat.hs - compiler/GHC/HsToCore/Match.hs - compiler/GHC/HsToCore/Match.hs-boot - compiler/GHC/HsToCore/Match/Constructor.hs - compiler/GHC/HsToCore/Match/Literal.hs - compiler/GHC/HsToCore/Monad.hs - compiler/GHC/HsToCore/Utils.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/Pat.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Utils/Concrete.hs - compiler/GHC/Types/Error/Codes.hs - compiler/GHC/Types/Id/Make.hs - docs/index.html.in - docs/users_guide/ghc_config.py.in - docs/users_guide/separate_compilation.rst - docs/users_guide/using.rst - hadrian/src/Rules/Generate.hs - rts/LdvProfile.c - rts/PrimOps.cmm - rts/Printer.c - rts/ProfHeap.c - rts/include/rts/storage/ClosureMacros.h - rts/sm/Sanity.c - rts/sm/Storage.c - testsuite/driver/perf_notes.py - testsuite/tests/bytecode/TLinkable/all.T - testsuite/tests/corelint/T21115b.stderr - testsuite/tests/diagnostic-codes/codes.stdout - testsuite/tests/dmdanal/should_compile/T23398.stderr - testsuite/tests/ffi/should_fail/all.T - + testsuite/tests/ffi/should_fail/ccfail006.hs - + testsuite/tests/ffi/should_fail/ccfail006.stderr - + testsuite/tests/ffi/should_fail/ccfail007.hs - + testsuite/tests/ffi/should_fail/ccfail007.stderr - + testsuite/tests/ffi/should_fail/ccfail008.hs - + testsuite/tests/ffi/should_fail/ccfail008.stderr - + testsuite/tests/ffi/should_fail/ccfail009.hs - + testsuite/tests/ffi/should_fail/ccfail009.stderr - testsuite/tests/numeric/should_compile/T23907.stderr - testsuite/tests/perf/compiler/all.T - testsuite/tests/rep-poly/RepPolyRecordPattern.hs - testsuite/tests/rep-poly/RepPolyRecordPattern.stderr - testsuite/tests/rep-poly/RepPolyRecordUpdate.stderr - testsuite/tests/rep-poly/T20113.stderr - − testsuite/tests/rep-poly/T20363.stderr - − testsuite/tests/rep-poly/T20363_show_co.hs - − testsuite/tests/rep-poly/T20363_show_co.stderr - − testsuite/tests/rep-poly/T20363b.stderr - + testsuite/tests/rep-poly/T20363c.hs - testsuite/tests/rep-poly/all.T - + testsuite/tests/rts/T27585.hs - + testsuite/tests/rts/T27585.stdout - testsuite/tests/rts/all.T - testsuite/tests/simplCore/should_compile/T24229a.stderr - testsuite/tests/simplCore/should_compile/T24229b.stderr - testsuite/tests/simplCore/should_compile/T3717.stderr - testsuite/tests/simplCore/should_compile/T3772.stdout - testsuite/tests/simplCore/should_compile/T4081.stderr - testsuite/tests/simplCore/should_compile/T4908.stderr - + testsuite/tests/th/AssocDefaultNotAssoc.hs - + testsuite/tests/th/AssocDefaultNotAssoc.stderr - + testsuite/tests/th/TH_InvalidTopDecl.hs - + testsuite/tests/th/TH_InvalidTopDecl.stderr - + testsuite/tests/th/TH_cvt_DefaultDataInstDecl.hs - + testsuite/tests/th/TH_cvt_DefaultDataInstDecl.stderr - + testsuite/tests/th/TH_cvt_GadtNoCons.hs - + testsuite/tests/th/TH_cvt_GadtNoCons.stderr - + testsuite/tests/th/TH_cvt_IllegalDeclaration.hs - + testsuite/tests/th/TH_cvt_IllegalDeclaration.stderr - + testsuite/tests/th/TH_cvt_IllegalSumAlt.hs - + testsuite/tests/th/TH_cvt_IllegalSumAlt.stderr - + testsuite/tests/th/TH_cvt_InvalidCCallImpent.hs - + testsuite/tests/th/TH_cvt_InvalidCCallImpent.stderr - + testsuite/tests/th/TH_cvt_InvalidTyFamInstLHS.hs - + testsuite/tests/th/TH_cvt_InvalidTyFamInstLHS.stderr - + testsuite/tests/th/TH_cvt_InvalidTypeInstanceHeader.hs - + testsuite/tests/th/TH_cvt_InvalidTypeInstanceHeader.stderr - + testsuite/tests/th/TH_cvt_RecGadtNoCons.hs - + testsuite/tests/th/TH_cvt_RecGadtNoCons.stderr - + testsuite/tests/th/TH_cvt_SumAltArityExceeded.hs - + testsuite/tests/th/TH_cvt_SumAltArityExceeded.stderr - testsuite/tests/th/all.T The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/6e10933a32ab9fd552aa3f26b462bd… -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/6e10933a32ab9fd552aa3f26b462bd… You're receiving this email because of your account on gitlab.haskell.org. Manage all notifications: https://gitlab.haskell.org/-/profile/notifications | Help: https://gitlab.haskell.org/help

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