Ben Gamari pushed to branch ghc-9.14 at Glasgow Haskell Compiler / GHC Commits: 9efc1c85 by Ben Gamari at 2025-08-12T12:20:58-04:00 Bump time submodule to 1.15 Also required bumps of Cabal, directory, and hpc. (cherry picked from commit 0434af813cd5aa629ef7566cd267d7cdefa42114) - - - - - cbfee32f by Andrew Lelechenko at 2025-08-12T12:27:19-04:00 hadrian: bump Stackage snapshot to LTS 24.2 / GHC 9.10.2 In line with #25693 we should use GHC 9.10 as a boot compiler, while Hadrian stack.yaml was stuck on GHC 9.6. (cherry picked from commit 57d3b4a82e97f379cc8f41d61675d8c3904f7572) - - - - - ad5ef2b6 by Andrew Lelechenko at 2025-08-12T12:27:51-04:00 Bump submodule text to 2.1.3 (cherry picked from commit 77df0ded670cffcc1e9bfd8d30f0bf0c0e54b3f7) - - - - - bbfead6c by Andreas Klebinger at 2025-08-12T12:29:01-04:00 rts: Support COFF BigObj files in archives. (cherry picked from commit 01136779b1d4c1576c925ef673f55c81c45d8551) - - - - - 7fb21569 by fendor at 2025-08-12T12:32:21-04:00 Revert "base: Expose Backtraces constructor and fields" This reverts commit 17db44c5b32fff82ea988fa4f1a233d1a27bdf57. (cherry picked from commit 4f6bc9cf2a5569e8ac3303a79f8a88fb23e2578b) - - - - - 13f32328 by Simon Peyton Jones at 2025-08-12T12:33:03-04:00 In TcSShortCut, typechecker plugins should get empty Givens Solving in TcShortCut mode means /ignoring the Givens/. So we should not pass them to typechecker plugins! Fixes #26258. This is a fixup to the earlier MR: commit 1bd12371feacc52394a0e660ef9349f9e8ee1c06 Author: Simon Peyton Jones Date: Mon Jul 21 10:04:49 2025 +0100 Improve treatment of SPECIALISE pragmas -- again! (cherry picked from commit 2860a9a5d657eacd711a7df4a231dc9fe81402c2) - - - - - 712da356 by Sylvain Henry at 2025-08-12T12:33:43-04:00 STM: don't create a transaction in the rhs of catchRetry# (#26028) We don't need to create a transaction for the rhs of (catchRetry#) because contrary to the lhs we don't need to abort it on retry. Moreover it is particularly harmful if we have code such as (#26028): let cN = readTVar vN >> retry tree = c1 `orElse` (c2 `orElse` (c3 `orElse` ...)) atomically tree Because it will stack transactions for the rhss and the read-sets of all the transactions will be iteratively merged in O(n^2) after the execution of the most nested retry. (cherry picked from commit 0a5836891ca29836a24c306d2a364c2e4b5377fd) - - - - - a52e0d45 by Zubin Duggal at 2025-08-12T12:33:54-04:00 haddock: Don't warn about missing link destinations for derived names. Fixes #26114 (cherry picked from commit 5dabc718a04bfc4d277c5ff7f815ee3d6b9670cb) - - - - - 9d73a535 by ARATA Mizuki at 2025-08-12T12:34:35-04:00 x86 NCG: Better lowering for shuffleFloatX4# and shuffleDoubleX2# The new implementation * make use of specialized instructions like (V)UNPCK{L,H}{PS,PD}, and * do not require -mavx. Close #26096 Co-authored-by: sheaf (cherry picked from commit 7ee22fd53bea1c69780613c339feee9ae75525b2) - - - - - 86a6ca1e by Duncan Coutts at 2025-08-12T12:34:59-04:00 base: Deprecate GHC.Weak.Finalize.runFinalizerBatch https://github.com/haskell/core-libraries-committee/issues/342 (cherry picked from commit 360fa82cc0e06163c7d712a22e7a33cf30e6b852) - - - - - 3be62b10 by Zubin Duggal at 2025-08-12T12:35:18-04:00 fetch_gitlab: Ensure we copy users_guide.pdf and Haddock.pdf to the release docs directory Fixes #24093 (cherry picked from commit 9fa590a6e27545995cdcf419ed7a6504e6668b18) - - - - - 3c02ae3c by Teo Camarasu at 2025-08-12T12:35:37-04:00 rts/nonmovingGC: remove n_free We remove the nonmovingHeap.n_free variable. We wanted this to track the length of nonmovingHeap.free. But this isn't possible to do atomically. When this isn't accurate we can get a segfault by going past the end of the list. Instead, we just count the length of the list when we grab it in nonmovingPruneFreeSegment. Resolves #26186 (cherry picked from commit 45efaf71d97355f76fe0db5af2fc5b4b67fddf47) - - - - - d96470b1 by Andreas Klebinger at 2025-08-12T12:35:58-04:00 Disable -fprof-late-overloaded-calls for join points. Currently GHC considers cost centres as destructive to join contexts. Or in other words this is not considered valid: join f x = ... in ... -> scc<tick> jmp This makes the functionality of `-fprof-late-overloaded-calls` not feasible for join points in general. We used to try to work around this by putting the ticks on the rhs of the join point rather than around the jump. However beyond the loss of accuracy this was broken for recursive join points as we ended up with something like: rec-join f x = scc<tick> ... jmp f x Which similarly is not valid as the tick once again destroys the tail call. One might think we could limit ourselves to non-recursive tail calls and do something clever like: join f x = scc<tick> ... in ... jmp f x And sometimes this works! But sometimes the full rhs would look something like: join g x = .... join f x = scc<tick> ... -> jmp g x Which, would again no longer be valid. I believe in the long run we can make cost centre ticks non-destructive to join points. Or we could keep track of where we are/are not allowed to insert a cost centre. But in the short term I will simply disable the annotation of join calls under this flag. (cherry picked from commit 7da86e165612721c4e09f772a3fdaffc733e9293) - - - - - 99e4eb40 by Rodrigo Mesquita at 2025-08-12T12:36:10-04:00 base: Export displayExceptionWithInfo This function should be exposed from base following CLC#285 Approved change in CLC#344 Fixes #26058 (cherry picked from commit ef03d8b8851a1cace5f792fe5a91b6b227198aa2) - - - - - 81de45dc by Sebastian Graf at 2025-08-12T12:36:29-04:00 CprAnal: Detect recursive newtypes (#25944) While `cprTransformDataConWork` handles recursive data con workers, it did not detect the case when a newtype is responsible for the recursion. This is now detected in the `Cast` case of `cprAnal`. The same reproducer made it clear that `isRecDataCon` lacked congruent handling for `AppTy` and `CastTy`, now fixed. Furthermore, the new repro case T25944 triggered this bug via an infinite loop in `cprFix`, caused by the infelicity in `isRecDataCon`. While it should be much less likely to trigger such an infinite loop now that `isRecDataCon` has been fixed, I made sure to abort the loop after 10 iterations and emitting a warning instead. Fixes #25944. (cherry picked from commit 4bc78496406f7469640faaa46e2f311c05760124) - - - - - 3d821e16 by Ben Gamari at 2025-08-12T12:36:43-04:00 configure: Allow override of CrossCompiling As noted in #26236, the current inference logic is a bit simplistic. In particular, there are many cases (e.g. building for a new libc) where the target and host triples may differ yet we are still able to run the produced artifacts as native code. Closes #26236. (cherry picked from commit 81577fe7c1913c53608bf03e48f84507be904620) - - - - - 0061a178 by Matthew Pickering at 2025-08-12T12:37:37-04:00 level imports: Check the level of exported identifiers The level imports specification states that exported identifiers have to be at level 0. This patch adds the requird level checks that all explicitly mentioned identifiers occur at level 0. For implicit export specifications (T(..) and module B), only level 0 identifiers are selected for re-export. ghc-proposal: https://github.com/ghc-proposals/ghc-proposals/pull/705 Fixes #26090 (cherry picked from commit 246b785367d8bf0059a641306fe662fecc3342af) - - - - - 6576e711 by Ben Gamari at 2025-08-12T12:45:20-04:00 Kill IOPort# This type is unnecessary, having been superceded by `MVar` and a rework of WinIO's blocking logic. See #20947. See https://github.com/haskell/core-libraries-committee/issues/213. (cherry picked from commit 34fc50c13b47842e0d1f9879285a68b06215c16b) - - - - - bf3a76e1 by Zubin Duggal at 2025-08-12T12:45:20-04:00 compiler: Export a version of `newNameCache` that is not prone to footguns. `newNameCache` must be initialized with both a non-"reserved" unique tag, as well as a list of known key names. Failing to do so results in hard to debug unique conflicts. It is difficult for API users to tell which unique tags are safe to use. So instead of leaving this up to the user to decide, we now export a version of `newNameCache` which uses a guaranteed non-reserved unique tag. In fact, this is now the way the unique tag is initialized for all invocations of the compiler. The original version of `newNameCache` is now exported as `newNameCache'` for advanced users. We also deprecate `initNameCache` as it is also prone to footguns and is completely subsumed in functionality by `newNameCache` and `newNameCache'`. Fixes #26135 and #26055 (cherry picked from commit bcdec6572a098f984efeb85bf45ff7c0b5d717af) - - - - - d832844a by Ben Gamari at 2025-08-12T12:45:20-04:00 testsuite/recomp015: Ignore stderr This is necessary since ld.bfd complains that we don't have a .note.GNU-stack section, potentially resulting in an executable stack. (cherry picked from commit 637bb53825b9414f7c7dbed4cc3e5cc1ed4d2329) - - - - - 30ad189d by fendor at 2025-08-14T22:27:38-04:00 Bump GHC on darwin CI to 9.10.1 (cherry picked from commit 358bc4fc8324a0685f336142d0d608cbd51d54f9) - - - - - 15d7ef64 by Zubin Duggal at 2025-08-14T22:27:38-04:00 ci: upgrade bootstrap compiler on windows to 9.10.1 (cherry picked from commit c8d76a2994b8620c54adc2069f4728135d6b5059) - - - - - 0ad30b89 by Ben Gamari at 2025-08-14T22:27:38-04:00 Accept performance shifts Metric Increase: WWRec - - - - - bdf66b51 by Simon Peyton Jones at 2025-08-15T06:26:00-04:00 Treat tuple dictionaries uniformly; don't unbox them See `Note [Do not unbox class dictionaries]` in DmdAnal.hs, sep (DNB1). This MR reverses the plan in #23398, which suggested a special case to unbox tuple dictionaries in worker/wrapper. But: - This was the cause of a pile of complexity in the specialiser (#26158) - Even with that complexity, specialision was still bad, very bad See https://gitlab.haskell.org/ghc/ghc/-/issues/19747#note_626297 And it's entirely unnecessary! Specialision works fine without unboxing tuple dictionaries. (cherry picked from commit ca7a9d421f602355822b674dd01fb48cd6291108) - - - - - 5194ccbc by Simon Peyton Jones at 2025-08-15T09:07:30-04:00 Make injecting implicit bindings into its own pass Previously we were injecting "impliicit bindings" (data constructor worker and wrappers etc) - both at the end of CoreTidy, - and at the start of CorePrep This is unpleasant and confusing. This patch puts it it its own pass, addImplicitBinds, which runs between the two. The function `GHC.CoreToStg.AddImplicitBinds.addImplicitBinds` now takes /all/ TyCons, not just the ones for algebraic data types. That change ripples through to - corePrepPgm - doCodeGen - byteCodeGen All take [TyCon] which includes all TyCons (cherry picked from commit fd811ded65bb9b19571ba525fb5eaf8f23a4533d) - - - - - 779a7bc6 by Simon Peyton Jones at 2025-08-15T09:07:33-04:00 Implement unary classes The big change is described exhaustively in Note [Unary class magic] in GHC.Core.TyCon Other changes * We never unbox class dictionaries in worker/wrapper. This has been true for some time now, but the logic is now centralised in functions in GHC.Core.Opt.WorkWrap.Utils, namely `canUnboxTyCon`, and `canUnboxArg` See Note [Do not unbox class dictionaries] in GHC.Core.Opt.WorkWrap.Utils. * Refactored the `notWorthFloating` logic in GHc.Core.Opt.SetLevels. I can't remember if I actually changed any behaviour here, but if so it's only in a corner cases. * Fixed a bug in `GHC.Core.TyCon.isEnumerationTyCon`, which was wrongly returning True for (##). * Remove redundant Role argument to `liftCoSubstWithEx`. It was always Representational. * I refactored evidence generation in the constraint solver: * Made GHC.Tc.Types.Evidence contain better abstactions for evidence generation. * I deleted the file `GHC.Tc.Types.EvTerm` and merged its (small) contents elsewhere. It wasn't paying its way. * Made evidence for implicit parameters go via a proper abstraction. * Fix inlineBoringOk; see (IB6) in Note [inlineBoringOk] This fixes a slowdown in `countdownEffectfulDynLocal` in the `effectful` library. Smaller things * Rename `isDataTyCon` to `isBoxedDataTyCon`. * GHC.Core.Corecion.liftCoSubstWithEx was only called with Representational role, so I baked that into the function and removed the argument. * Get rid of `GHC.Core.TyCon.tyConSingleAlgDataCon_maybe` in favour of calling `not isNewTyCon` at the call sites; more explicit. * Refatored `GHC.Core.TyCon.isInjectiveTyCon`; but I don't think I changed its behaviour * Moved `decomposeIPPred` to GHC.Core.Predicate Compile time performance changes: geo. mean +0.1% minimum -6.8% maximum +14.4% The +14% one is in T21839c, where it seems that a bit more inlining is taking place. That seems acceptable; and the average change is small Metric Decrease: LargeRecord T12227 T12707 T16577 T21839r T5642 Metric Increase: T15164 T21839c T3294 T5321FD T5321Fun WWRec (cherry picked from commit 9bd7fcc518111a1549c98720c222cdbabd32ed46) - - - - - e09e1443 by Simon Peyton Jones at 2025-08-15T12:25:41-04:00 Fix a long-standing assertion error in normSplitTyConApp_maybe (cherry picked from commit 60db2c66b870bac28615d272936bef6905befdbb) - - - - - 7b814248 by Simon Peyton Jones at 2025-08-15T12:25:50-04:00 Add comment to coercion optimiser (cherry picked from commit b2b95dce34ce7f6a8f0acdd637cbe2cafc56c922) - - - - - 205 changed files: - .gitlab/darwin/toolchain.nix - .gitlab/generate-ci/gen_ci.hs - .gitlab/jobs.yaml - .gitlab/rel_eng/fetch-gitlab-artifacts/fetch_gitlab.py - compiler/GHC/Builtin/Names.hs - compiler/GHC/Builtin/Types.hs - compiler/GHC/Builtin/Types/Prim.hs - compiler/GHC/Builtin/primops.txt.pp - compiler/GHC/ByteCode/InfoTable.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToAsm/X86/Ppr.hs - compiler/GHC/Core/Class.hs - compiler/GHC/Core/Coercion.hs - compiler/GHC/Core/Coercion/Opt.hs - compiler/GHC/Core/DataCon.hs - compiler/GHC/Core/FamInstEnv.hs - compiler/GHC/Core/LateCC/OverloadedCalls.hs - compiler/GHC/Core/Opt/Arity.hs - compiler/GHC/Core/Opt/CprAnal.hs - compiler/GHC/Core/Opt/DmdAnal.hs - compiler/GHC/Core/Opt/OccurAnal.hs - compiler/GHC/Core/Opt/SetLevels.hs - compiler/GHC/Core/Opt/Specialise.hs - compiler/GHC/Core/Opt/WorkWrap/Utils.hs - compiler/GHC/Core/Predicate.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/Unfold/Make.hs - compiler/GHC/Core/Utils.hs - compiler/GHC/CoreToStg.hs - + compiler/GHC/CoreToStg/AddImplicitBinds.hs - compiler/GHC/CoreToStg/Prep.hs - compiler/GHC/Driver/Main.hs - compiler/GHC/HsToCore/Binds.hs - compiler/GHC/HsToCore/Expr.hs - compiler/GHC/HsToCore/Foreign/Call.hs - compiler/GHC/Iface/Decl.hs - compiler/GHC/Iface/Syntax.hs - compiler/GHC/Iface/Tidy.hs - compiler/GHC/IfaceToCore.hs - compiler/GHC/Rename/Module.hs - compiler/GHC/StgToByteCode.hs - compiler/GHC/StgToCmm.hs - compiler/GHC/StgToCmm/Prim.hs - compiler/GHC/StgToJS/Prim.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Gen/Bind.hs - compiler/GHC/Tc/Gen/Export.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Instance/Class.hs - compiler/GHC/Tc/Instance/Family.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Solver/Solve.hs - compiler/GHC/Tc/TyCl.hs - compiler/GHC/Tc/TyCl/Build.hs - compiler/GHC/Tc/TyCl/Instance.hs - compiler/GHC/Tc/TyCl/PatSyn.hs - compiler/GHC/Tc/TyCl/Utils.hs - − compiler/GHC/Tc/Types/EvTerm.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Types/Demand.hs - compiler/GHC/Types/Id.hs - compiler/GHC/Types/Id/Make.hs - compiler/GHC/Types/Name/Cache.hs - 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utils/haddock/haddock-api/src/Haddock/Interface/Rename.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/33331570de1b79286218fef976bc6dd... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/33331570de1b79286218fef976bc6dd... You're receiving this email because of your account on gitlab.haskell.org.