[Git][ghc/ghc][wip/sand-witch/27423-gadt-parens] 61 commits: Allow rewriting in RuntimeReps for newtype ConPats

Andrei Borzenkov pushed to branch wip/sand-witch/27423-gadt-parens 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@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 - - - - - 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@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'. - - - - - b19fcc1c by Vladislav Zavialov at 2026-08-14T06:26:11-04:00 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 - - - - - 7b27f25a by Simon Jakobi at 2026-08-14T06:26:54-04:00 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 - - - - - e5de423b by Simon Jakobi at 2026-08-14T06:26:54-04:00 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 - - - - - db959f83 by Simon Jakobi at 2026-08-14T15:16:44-04:00 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 - - - - - 4f2b7d90 by Simon Jakobi at 2026-08-14T15:16:44-04:00 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 - - - - - c4abddcb by Simon Jakobi at 2026-08-14T15:16:44-04:00 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 - - - - - 4a7defa1 by Simon Jakobi at 2026-08-14T15:16:44-04:00 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 - - - - - b757727a by Vladislav Zavialov at 2026-08-14T15:17:27-04:00 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 - - - - - c130188d by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 loopImports: Don't dup ms_uid in summary imports We were writing the ms_unitid of the mod summary with every single import of that module That complicated the code (as though the UnitId in that list could ever be something else) and also allocates unnecessarily per every mod import. Very slight allocation decrease measured locally in a few tests: (MultiComponentModulesRecomp: -0.06%; MultiComponentModulesRecomp100: -0.05%) Purely a clean up. - - - - - c71166a8 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 downsweep: make control flow simpler and cache correct This refactor extracts the control flow of downsweep into a single function `dfsBuild`, which takes care of iteratively expanding and traversing all nodes of the in-construction module graph necessary to build a full `ModuleGraph`. There are three levels of caching going on, all of which are necessary to make sure we don't do repeated work (notably, NEVER summarise the same module twice). 1. `dfsBuild` accumulates the final module graph and never revisits the same node of the module graph. Cache is keyed by the final `ModuleGraph`s `NodeKey`s. 2. For Module A in home-unit u1, each import in the list of imports needs to be *found* (call to `findImportedModuleWithIsBoot`): at this point, we only have the `ModuleName` of the import, not the `Module`. This *finding* is somewhat expensive, so we cache it as well (`ImportsCache`). The cache key is the home-unit to which the module belongs~[1], the import package qualifier, and the ModuleName. [1] Different home-units will have different package flags, which means potentially different `Module` resolution for the same `ModuleName`. 3. The most expensive operation we want to avoid is summarising a `Module` into a `ModSummary`, which notably involves parsing the module header from scratch. The third cache, in essence, maps a `Module` to its `ModSummary` (named `ModSummaryCache`). This cache upholds the invariant: we NEVER summarise the same module twice. In practice, the cache key is the Module's UnitId and the Source path; the reason is we need to distinguish between `.hs` and `.hs-boot` files, as their summaries will differ. Note that (2) can't guarantee this alone: Two ModuleName imports in separate units can (and likely do) map to the same `Module`. Note that the previous implementation failed to achieve the no-duplicate-work summarisation invariant, and we ended up doing a quadratic amount of processing in scenarios like test `MultiComponentModules100`. See also Note [Downsweep Control Flow and Caching] Fixes #27461 Perf changes: MultiComponentModules(normal) ghc/alloc 2,097,389,264 1,992,186,736 -5.0% GOOD MultiComponentModules100(normal) ghc/alloc 24,310,173,770 21,293,867,360 -12.4% GOOD MultiComponentModulesRecomp(normal) ghc/alloc 602,761,394 498,543,984 -17.3% GOOD MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,968,240 8,895,404,864 -25.2% GOOD ------------------------- Metric Decrease: MultiComponentModules MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 ------------------------- - - - - - ebc4047b by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 implicitRequirementsShallow can never reach HoleUnit findImportedModule will never return `HoleUnit` for a `ModuleName` (a `HoleUnit` can only be found as a signature instantiation, never as a directly *imported* thing) Therefore, we can drop `[ModuleName]` returned by `implicitRequirementsShallow`, which makes many things dead code. Namely, the call to `implicitRequirementsShallow` from GHC.Driver.Downsweep which was a performance bottleneck (for doing lots of duplicate work in findImportedModule) is now entirely gone. Fixes #27053 In an MR with this patch and the downsweep refactor (previous commit), CI says: MultiComponentModules(normal) ghc/alloc 2,097,396,728 1,943,662,304 -7.3% GOOD MultiComponentModules100(normal) ghc/alloc 24,310,182,136 17,227,574,440 -29.1% GOOD MultiComponentModulesRecomp(normal) ghc/alloc 602,769,518 449,973,656 -25.3% GOOD MultiComponentModulesRecomp100(normal) ghc/alloc 11,885,976,408 4,828,894,160 -59.4% GOOD ------------------------- Metric Decrease: MultiComponentModules MultiComponentModules100 MultiComponentModulesRecomp MultiComponentModulesRecomp100 ------------------------- - - - - - 85a6ab01 by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 downsweep: Cache negative results When traversing a module graph structure, a uniquely identified node should always expand to the same thing. I don't see how visiting the same node which failed to be expanded a first time would ever successfully expand the second time we try to expand it (eg. when coming from a different edge to it -- it is still the same node!). The node expansion is local, based just based on the node itself, not on the path to get there. Therefore, this patch removes the weird behavior and commentary of `dfsBuild` wrt to `Nothing` not being cached and being potentially expanded a second time around to something different, which was misleading and, ultimately, incorrect. Now, we have a `MGRes`, which is more explicit about a node being Skipped just being a node that is ignored whenever it is found (and that skip is cached) -- and we may want to do this due to failures or due to just trying nodes which might not work on purpose, like hs-boots. We uniformly cache positive and negative results and remove the assumption that there might be an ordering in which the same node visited at a later time might be expanded differently. This makes it possible to traverse the module nodes in parallel without a change in behavior, since there's no longer a hidden ordering requirement. - - - - - 56747c3f by Rodrigo Mesquita at 2026-08-15T06:29:53-04:00 Organize and clean-up GHC.Driver.Downsweep Simply some cosmetic changes, moving definitions around to structure the module better into its relevant sections (In go (ns ++ ss), it's not a problem to use ++ because it's a good producer and we won't have to append fully before processing the next item in go) - - - - - 12f64118 by Wolfgang Jeltsch at 2026-08-15T06:31:12-04:00 Add support for textual output of bytecode file content - - - - - a737df91 by Brandon Chinn at 2026-08-15T12:40:25-04:00 Add law in qualified strings doc - - - - - e3188581 by Zubin Duggal at 2026-08-15T12:41:06-04:00 DmdAnal: Fix maxDmdType We need to eta expand the smaller DmdType using defaultArgDmd, like in lubDmdType. Introduce zipDmdType as a common combinator to implement both maxDmdType and lubDmdType uniformly. fixes #27626 - - - - - ca9b0b22 by mangoiv at 2026-08-15T12:41:47-04:00 hadrian: set the executable bit for hie-bios.bat - - - - - 1aac7095 by sheaf at 2026-08-16T04:37:16-04:00 Avoid wasteful allocations in mkTyConAppCo The idiom "traverse isReflCo_maybe" followed by "map fst" used in 'GHC.Core.Coercion.mkTyConAppCo' was allocating a lot of waste. This commit uses 'GHC.Data.Unboxed.traverseMaybeUB' to avoid all these unnecessary intermediate allocations. In a quick microbenchmark for 'mkTyConAppCo', this change resulted in: - refl case (all argument coercions are reflexive): - -60% runtime - -80% allocations - non-refl case: - from 0% to -12% runtime (depending on which argument is non-refl) - from 0% to -70% allocations ( -- '' -- ) Fixes #27648 ------------------------- Metric Decrease: FamAppCachePerf SimplCastPerf T12425 T15703 T26426 T3064 T9872a T9872b T9872b_defer T9872c T9872d T5321Fun T9020 T9630 TcPlugin_RewritePerf Metric Increase: LinkableUsage02 ------------------------- - - - - - 3915e982 by Alan Zimmerman at 2026-08-16T04:37:58-04:00 EPA: Remove al_trailing from AnnList It was not being used - - - - - fed942ac by Andreas Klebinger at 2026-08-17T12:11:57-04:00 testsuite: Use sigkill in process009. SIGHUB might have been blocked by a (grand)*parent of the test. In such cases the test would fail as the python process would simply exist gracefully instead of committing to a premature end. By using SIGKILL we can rely on the signal not being blocked, fixing #27578 in the process. - - - - - 574c875f by Andreas Klebinger at 2026-08-17T12:12:39-04:00 Simplify comparison in DFM.hs Fixes #27669 - - - - - d8f1a2a3 by Alan Zimmerman at 2026-08-17T12:13:18-04:00 TTG: Add extension points to BooleanFormula They are currently unused, but will be used for exact print annotations next, allowing us to get rid of LocatedBF / SrcSpanAnnBF - - - - - 93a2b20f by Andreas Klebinger at 2026-08-18T04:31:04-04:00 Fix a number of incorrect module references: Fix module reference in Note [DataCon wrappers are conlike]. Fix module reference in Note [Detailed InertCans Invariants]. Fix module reference in Note [GHC's data format representations]. Fix module reference in Note [Grand plan for static forms]. Fix module reference in Note [How tuples work]. Fix module reference in Note [Solved dictionaries]. Fix module reference in Note [Stacktraces from Info Table Provenance Entries (IPE based stack unwinding)]. Fix module reference in Note [The VarBndr type and its uses]. Found the incorrect references with a llm. - - - - - eb0dfb01 by Simon Jakobi at 2026-08-18T04:31:44-04:00 ci: Run stack-hadrian-build only in full-ci pipelines The job exists to catch changes that break hadrian/build-stack (#18726), but nothing in the pipeline depends on it, and it can only break when hadrian's dependencies change. Restricting it to full-ci (like hadrian-multi) still covers marge-bot merge batches, so such breakage cannot reach master unnoticed, while ordinary validate pipelines skip the job. Assisted-by: Claude Fable 5 - - - - - b9160962 by Simon Jakobi at 2026-08-20T14:57:52-04:00 testsuite: Show baseline sample count and range in perf failures A perf baseline is the mean of all samples recorded for a commit, and it prints as a single number, hiding how far the samples spread. When the spread is wide, this can indicate an unstable metric that isn't actually useful as a signal for the perf tests. For example, in #27602, T27336's peak_megabytes_allocated baseline showed as 757 when the underlying samples were 605 and 909. When the baseline is averaged from more than one sample, say so in the failure output: the one-line stat-failure reason shows the sample range, and the detail block lists the raw samples. Single-sample baselines print exactly as before. Context: #27602 Assisted-by: Claude Fable 5 - - - - - a4979877 by Simon Jakobi at 2026-08-20T14:57:52-04:00 testsuite: Fold Baseline into CommitMetric A Baseline was just a CommitMetric plus the commit it came from, built by copying fields across. Since get_commit_metric already knows that commit, record it on CommitMetric itself and drop Baseline. This also collapses both branches of find_baseline into plain returns. Assisted-by: Claude Fable 5 - - - - - 99fb8d68 by Simon Jakobi at 2026-08-20T14:57:52-04:00 ci: Clarify comment on pushing perf notes after failures Context: #27602 Assisted-by: Claude Fable 5 - - - - - 2ca87972 by Alan Zimmerman at 2026-08-20T14:58:36-04:00 EPA: Remove LocatedBC / SrcSpanBF The custom annotations are now in the BooleanFormula TTG extension points, so LBooleanFormula can now use the standard LocatedA. - - - - - d2bc32aa by Simon Peyton Jones at 2026-08-21T12:59:26-04:00 Better handling of serialisation of wired-in names Fixes #27501 - - - - - d2795ffc by Alan Zimmerman at 2026-08-21T13:00:05-04:00 EPA: Remove NoEpTok/NoEpUniTok, using an unhelpful SrcSpan instead Also introduce helper functions noEpTok and noEpUniTok to serve as simple replacements in code inserting an token annotation without location information. - - - - - b5d29ab8 by Brandon Chinn at 2026-08-25T18:42:08-04:00 Add Data.RealFloat and Infinity/NegInfinity/NaN pattern synonyms (#26961) - - - - - e60eb3bc by Andreas Klebinger at 2026-08-25T18:42:59-04:00 rts linker: Fix pointer arithmetic issue in flushInstructionCacheRISCV64 We accidentally operated over `uint64_t*` when we should use `uint8_t`. Fixes #27569 - - - - - e9bbe8f9 by Andreas Klebinger at 2026-08-26T15:09:23-04:00 cmm dumps: Add machop width info with -dppr-debug for infix ops. - - - - - 86e3a9d8 by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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. - - - - - 13781cca by Andreas Klebinger at 2026-08-26T15:09:24-04:00 arm64 ncg: The big subword truncation fix. A set of slightly related fixes to arm subword handling: Bitmask immediates: Don't produce overflowing assembly literals. There is still another bug here that causes us to miss some valid literals but we will fix that later. 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. Subword ffi results: Apply truncations when calling functions returning subword values. genCondJump: Don't sign extend signed values in the input register as it might map to a local variable, corrupting the value stored within. 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. - - - - - d8fa5d7c by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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. - - - - - 94822c95 by Andreas Klebinger at 2026-08-26T15:09:24-04:00 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 - - - - - dd1ba88a by Andreas Klebinger at 2026-08-26T15:09:24-04:00 cmmLint: Lint against MO_FS_Truncate subword use. - - - - - fd22f71e by Zubin Duggal at 2026-08-26T15:10:20-04:00 ghc-internal: annotateSTM should use catchSTM# rather than catch# A catch# frame inside a transaction breaks retry and async exception delivery. Fixes #27657 - - - - - bb324171 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00 rts: refactor to reduce THREADED_RTS in MSG_UPD_TSO_FLAGS - No behavior change in this commit (well, a small optimization here makes us do less work if the target TSO owned by the curr. capability) - Move all THREADED_RTS CPP needed into `updThreadFlag` - Merge MSG_SET_TSO_FLAGS and MSG_UNSET_TSO_FLAGS into MSG_UPD_TSO_FLAGS plus a `set` bool field in the MessageUpdTSOFlag struct Towards #27729 - - - - - ed99b7b7 by Rodrigo Mesquita at 2026-08-26T15:10:59-04:00 rts: Fix race condition in MSG_UPD_TSO_FLAGS execution The code for processing the MSG_UPD_TSO_FLAGS message was not taking into consideration that the TSO's owner might have moved in between that capability receiving the message (since it was its previous owner) and starting to process its inbox (a point at which it was no longer the owner) Added Note [TSO owner may change in between Msg being sent and received] to explain this race and the pattern used to fix this, where we just forward the message to the new owner. Fixes #27729 - - - - - cd653714 by Alan Zimmerman at 2026-08-26T15:11:49-04:00 EPA: Uses Parsers.parseModule for exactprint tests Parsers.parseModule is the advertised way to parse for use for exact printing in the ghc-exactprint library. This commit updates the GHC exact print testing to use it. This requires moving the comment balancing that was occurring only in the test path into the advertising parser path, so it moves from Transforms.hs to Utils.hs. Also update the comment adding to honour trailing annotations - - - - - d1d01fa5 by Wolfgang Jeltsch at 2026-08-27T13:17:59+03:00 Add `rethrowSTM` and improve STM-related documentation Adding `rethrowSTM` resolves #26758. The implementation of `rethrowSTM` is completely analogous to the one of `rethrowIO`. The following is established for the documentation of `throwSTM` and `catchSTM`: * Both operations are directly described as analogs of their `IO` counterparts. * There is no reference to `throw` in the documentation of `throwSTM`, because, although such a reference is great in the documentation of `throwIO`, it is somewhat out of place in the documentation of `throwSTM`. * Instead of repeating part of `throwIO`’s documentation, the documentation of `throwSTM` just recommends using `throwSTM` instead of `throw` and references the corresponding arguments in the documentation of `throwIO`. - - - - - 06fde293 by fendor at 2026-08-28T06:06:44-04:00 GHCi: Fix order of `PackageDBFlag`s for interactive home unit `PackageDBFlag`s are stored in reverse order of cli specification. When sorting the `PackageDBFlag`s by longest common prefix, we need thus to reverse the package db stacks before calculating the prefix. We make sure to reverse the package db stack for the interactive home unit to uphold that later specified package dbs overwrite earlier ones. Resolved and adds regression test for #27640 - - - - - 024c4d04 by fendor at 2026-08-28T06:07:23-04:00 Reuse the UnitIndexCache after initialising multiple home units - - - - - 55326fa0 by Alan Zimmerman at 2026-08-28T06:08:03-04:00 EPA: Some Haddock processing tweaks These changes to the Haddock postprocessing should not change behaviour, but just bring it more closely in line with the original, changed at 44309cd377f And add some haddock exactprint tests to show they work. - - - - - b3ddee95 by Andreas Klebinger at 2026-08-28T13:57:46-04:00 hadrian: Deprecate quickest flavour. It was more of a trap for new users than actually beneficial so we deprecate it and suggest quick+no_dynamic_libs to users instead. - - - - - a1d81390 by Andreas Klebinger at 2026-08-28T13:58:37-04:00 cmm: Always favour entry block during block deduplication. We now always keep the first block in the CmmGraph. This way we avoid the need to update the entry info table. Failing to do so caused #27722. Fixes #27722. - - - - - 5bd65f00 by Andreas Klebinger at 2026-08-28T13:59:16-04:00 test: FamAppCachePerf - Only collect bytes allocated. Fixes 27747 - - - - - ced53ce6 by mangoiv at 2026-08-29T07:15:24-04:00 nightlies: output yaml to file only Previously we would just output the metadata to stdout which risks that it's clobbered by incidental debugt output. We now output to file only. Fixes #27511 - - - - - 578bd185 by Andreas Klebinger at 2026-08-29T07:16:05-04:00 Specialise: Stop looping on recursive dictionaries in interestingDict interestingDict now doesn't look through loopbreaker unfoldings. Doing so would cause infinite loops on certain dictionaries. Fixes #27705. - - - - - 9439cba9 by Andrei Borzenkov at 2026-08-31T14:44:18+04:00 Parentheses in prefix GADT constructors (#27423) Updated `splitLHsGadtTy` to allow looking through the parentheses for inner binders. General example of a code pattern that's allowed now: data S a where MkS :: (forall a. S a) That should work now with any combination of nested foralls and parentheses. We don't perform parenthesis unwrapping for record GADT constructors in accordance with GHC Proposal #402. To this end `con_inner_bndrs` no longer stores plain forall telescopes: `[HsForAllTelescope pass]` is replaced with `[LHsGadtArg pass]`, a new `HsArg`-style type whose `HsGadtForAll` holds an inner telescope and whose `HsGadtPar` holds a pair of parentheses. The parentheses carry no meaning for renaming or type checking; the only reason to record them is exact-printing. Updated `pprConDecl` to improve the `parse == parse . ppr . parse` property of GADT pretty-printing. The pretty printer can now output code that's similar to this: data T a where MkT1 :: (forall a. T a) MkT2 :: forall . forall a. T a These are special cases of inner forall binders for prefix GADT constructors, when we have either implicit or zero explicit outer binders. - - - - - ea472e5c by Andrei Borzenkov at 2026-08-31T14:44:22+04:00 Address comments - - - - - ef909336 by Andrei Borzenkov at 2026-08-31T15:23:01+04:00 Try to fix CI - - - - - 1054 changed files: - .gitlab-ci.yml - .gitlab/ci.sh - .gitlab/rel_eng/mk-ghcup-metadata/mk_ghcup_metadata.py - + changelog.d/27626 - + changelog.d/T20363 - changelog.d/T27202 - + changelog.d/T27586 - + changelog.d/T27657 - + changelog.d/T27705 - + changelog.d/T27722-cbe-entry-block.md - + changelog.d/allow-gadt-prefix-con-parens - + changelog.d/arm_ncg_fixes_T27430 - + changelog.d/downsweep-refactor - changelog.d/fix-heap-census-large-arrays-19048 - + changelog.d/refactor-known-names - + changelog.d/rethrow-stm - + changelog.d/show-byte-code - changelog.d/unit-index - 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/ByteCode/Serialize.hs - + compiler/GHC/ByteCode/Show.hs - compiler/GHC/Cmm/CommonBlockElim.hs - 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 - 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View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/52ecaabb7cb818ac8ca7306891fbd62... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/52ecaabb7cb818ac8ca7306891fbd62... 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