Simon Peyton Jones pushed to branch wip/T23162-spj at Glasgow Haskell Compiler / GHC Commits: d4a9d6d6 by ARATA Mizuki at 2025-10-19T18:43:47+09:00 Handle implications between x86 feature flags This includes: * Multiple -msse* options can be specified * -mavx implies -msse4.2 * -mavx2 implies -mavx * -mfma implies -mavx * -mavx512f implies -mavx2 and -mfma * -mavx512{cd,er,pf} imply -mavx512f Closes #24989 Co-authored-by: sheaf - - - - - c9b8465c by Cheng Shao at 2025-10-20T10:16:00-04:00 wasm: workaround WebKit bug in dyld This patch works around a WebKit bug and allows dyld to run on WebKit based platforms as well. See added note for detailed explanation. Co-authored-by: Codex - - - - - 91b6be10 by Julian Ospald at 2025-10-20T18:21:03-04:00 Improve error handling in 'getPackageArchives' When the library dirs in the package conf files are not set up correctly, the JS linker will happily ignore such packages and not link against them, although they're part of the link plan. Fixes #26383 - - - - - 6c5269da by Sven Tennie at 2025-10-20T18:21:44-04:00 Align coding style Improve readability by using the same style for all constructor calls in this function. - - - - - 3d305889 by Sven Tennie at 2025-10-20T18:21:44-04:00 Reduce complexity by removing joins with mempty ldArgs, cArgs and cppArgs are all `mempty`. Thus concatenating them adds nothing but some complexity while reading the code. - - - - - 2f01ff74 by Richard Eisenberg at 2025-10-21T16:26:49+01:00 Refactor fundep solving This commit is a large-scale refactor of the increasingly-messy code that handles functional dependencies. It has virtually no effect on what compiles but improves error messages a bit. And it does the groundwork for #23162. The big picture is described in Note [Overview of functional dependencies in type inference] in GHC.Tc.Solver.FunDeps * New module GHC.Tc.Solver.FunDeps contains all the fundep-handling code for the constraint solver. * Fundep-equalities are solved in a nested scope; they may generate unifications but otherwise have no other effect. See GHC.Tc.Solver.FunDeps.solveFunDeps The nested needs to start from the Givens in the inert set, but not the Wanteds; hence a new function `resetInertCans`, used in `nestFunDepsTcS`. * That in turn means that fundep equalities never show up in error messages, so the complicated FunDepOrigin tracking can all disappear. * We need to be careful about tracking unifications, so we kick out constraints from the inert set after doing unifications. Unification tracking has been majorly reformed: see Note [WhatUnifications] in GHC.Tc.Utils.Unify. A good consequence is that the hard-to-grok `resetUnificationFlag` has been replaced with a simpler use of `reportCoarseGrainUnifications` Smaller things: * Rename `FunDepEqn` to `FunDepEqns` since it contains multiple type equalities. Some compile time improvement Metrics: compile_time/bytes allocated Baseline Test value New value Change ---------------------- -------------------------------------- T5030(normal) 173,839,232 148,115,248 -14.8% GOOD hard_hole_fits(normal) 286,768,048 284,015,416 -1.0% geo. mean -0.2% minimum -14.8% maximum +0.3% Metric Decrease: T5030 - - - - - 804f7661 by Simon Peyton Jones at 2025-10-21T16:26:50+01:00 QuickLook's tcInstFun should make instantiation variables directly tcInstFun must make "instantiation variables", not regular unification variables, when instantiating function types. That was previously implemented by a hack: set the /ambient/ level to QLInstTyVar. But the hack finally bit me, when I was refactoring WhatUnifications. And it was always wrong: see the now-expunged (TCAPP2) note. This commit does it right, by making tcInstFun call its own instantiation functions. That entails a small bit of duplication, but the result is much, much cleaner. - - - - - 71d63e6e by Simon Peyton Jones at 2025-10-21T16:26:50+01:00 Build implication for constraints from (static e) This commit addresses #26466, by buiding an implication for the constraints arising from a (static e) form. The implication has a special ic_info field of StaticFormSkol, which tells the constraint solver to use an empty set of Givens. See (SF3) in Note [Grand plan for static forms] in GHC.Iface.Tidy.StaticPtrTable This commit also reinstates an `assert` in GHC.Tc.Solver.Equality. The test `StaticPtrTypeFamily` was failing with an assertion failure, but it now works. - - - - - 71d685c4 by Simon Peyton Jones at 2025-10-21T16:26:50+01:00 Comments about defaulting representation equalities - - - - - 033cd5ba by Simon Peyton Jones at 2025-10-21T16:26:50+01:00 Improve kick-out after filling coercion holes The Note needs updating if CI is happy - - - - - 24d616ba by Simon Peyton Jones at 2025-10-21T16:26:50+01:00 Improve tracking of RewriterSets A bit experimental. Avoids taking the free coercion holes of a coercion, which can be expensive if the coercion is the result of a huge rewrite. The rewriter returns the RewriterSet! - - - - - a56335d1 by Simon Peyton Jones at 2025-10-21T16:26:50+01:00 Tidy up trySolveImplication This completes some leftover mess from commit 14123ee646f2b9738a917b7cec30f9d3941c13de Author: Simon Peyton Jones Date: Wed Aug 20 00:35:48 2025 +0100 Solve forall-constraints via an implication, again - - - - - 9b93d4cd by Simon Peyton Jones at 2025-10-21T16:26:50+01:00 Big increment in rewriter tracking Needs more documentation More tidying up of rewriter sets - - - - - 85938f59 by Simon Peyton Jones at 2025-10-21T16:29:46+01:00 Do not treat CoercionHoles as free variables in coercions This fixes a long-standing wart in the free-variable finder; now CoercionHoles are no longer treated as a "free variable" of a coercion. I got big and unexpected performance regressions when making this change. Turned out that CallArity didn't discover that the free variable finder could be eta-expanded, which gave very poor code. So I re-used Note [The one-shot state monad trick] for Endo, resulting in GHC.Utils.EndoOS. Very simple, big win. - - - - - 848dc054 by Simon Peyton Jones at 2025-10-21T16:29:46+01:00 Fix buglet in solving equalities from QCIs - - - - - 5ae3c227 by Simon Peyton Jones at 2025-10-21T16:29:46+01:00 Improve equality checking for foralls a bit ...by re-using the TcEvBindsVar - - - - - 861d46ce by Simon Peyton Jones at 2025-10-21T16:29:46+01:00 Update debug-tracing in CallArity No effect on behaviour, and commented out anyway - - - - - 110 changed files: - compiler/GHC/CmmToAsm/Config.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/Core/Opt/CallArity.hs - compiler/GHC/Core/TyCo/FVs.hs - compiler/GHC/Core/TyCo/Rep.hs - compiler/GHC/Core/TyCon.hs - compiler/GHC/Driver/Config/CmmToAsm.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Iface/Tidy/StaticPtrTable.hs - compiler/GHC/Platform.hs - compiler/GHC/Runtime/Eval.hs - compiler/GHC/StgToJS/Linker/Linker.hs - compiler/GHC/Tc/Errors.hs - compiler/GHC/Tc/Errors/Ppr.hs - compiler/GHC/Tc/Errors/Types.hs - compiler/GHC/Tc/Gen/App.hs - compiler/GHC/Tc/Gen/Expr.hs - compiler/GHC/Tc/Gen/Sig.hs - compiler/GHC/Tc/Instance/FunDeps.hs - compiler/GHC/Tc/Solver.hs - compiler/GHC/Tc/Solver/Default.hs - compiler/GHC/Tc/Solver/Dict.hs - compiler/GHC/Tc/Solver/Equality.hs - + compiler/GHC/Tc/Solver/FunDeps.hs - compiler/GHC/Tc/Solver/InertSet.hs - compiler/GHC/Tc/Solver/Irred.hs - compiler/GHC/Tc/Solver/Monad.hs - compiler/GHC/Tc/Solver/Rewrite.hs - compiler/GHC/Tc/Solver/Solve.hs - compiler/GHC/Tc/Solver/Solve.hs-boot - compiler/GHC/Tc/Types.hs - compiler/GHC/Tc/Types/Constraint.hs - compiler/GHC/Tc/Types/Evidence.hs - compiler/GHC/Tc/Types/Origin.hs - compiler/GHC/Tc/Utils/Instantiate.hs - compiler/GHC/Tc/Utils/Monad.hs - compiler/GHC/Tc/Utils/TcMType.hs - compiler/GHC/Tc/Utils/TcType.hs - compiler/GHC/Tc/Utils/Unify.hs - compiler/GHC/Tc/Zonk/TcType.hs - compiler/GHC/Tc/Zonk/Type.hs - compiler/GHC/Types/Basic.hs - compiler/GHC/Types/Unique/DSM.hs - + compiler/GHC/Utils/EndoOS.hs - compiler/ghc.cabal.in - docs/users_guide/9.16.1-notes.rst - docs/users_guide/using.rst - hadrian/src/Rules/Gmp.hs - hadrian/src/Rules/Libffi.hs - hadrian/src/Settings/Builders/Cabal.hs - hadrian/src/Settings/Builders/Common.hs - hadrian/src/Settings/Builders/DeriveConstants.hs - hadrian/src/Settings/Builders/Hsc2Hs.hs - testsuite/tests/codeGen/should_gen_asm/all.T - + testsuite/tests/codeGen/should_gen_asm/mavx-should-enable-popcnt.asm - + testsuite/tests/codeGen/should_gen_asm/mavx-should-enable-popcnt.hs - + testsuite/tests/codeGen/should_gen_asm/msse-option-order.asm - + testsuite/tests/codeGen/should_gen_asm/msse-option-order.hs - testsuite/tests/default/default-fail05.stderr - testsuite/tests/dependent/should_fail/T13135_simple.stderr - testsuite/tests/deriving/should_fail/T3621.stderr - testsuite/tests/indexed-types/should_fail/T14369.stderr - testsuite/tests/indexed-types/should_fail/T1897b.stderr - testsuite/tests/parser/should_fail/RecordDotSyntaxFail10.stderr - testsuite/tests/parser/should_fail/RecordDotSyntaxFail13.stderr - testsuite/tests/parser/should_fail/T20654a.stderr - testsuite/tests/perf/compiler/T8095.hs - testsuite/tests/perf/compiler/T9872a.hs - testsuite/tests/polykinds/T6068.stdout - testsuite/tests/quantified-constraints/T15359.hs - testsuite/tests/rep-poly/RepPolyNPlusK.stderr - testsuite/tests/rep-poly/RepPolyRightSection.stderr - testsuite/tests/rep-poly/T14561b.stderr - testsuite/tests/typecheck/no_skolem_info/T13499.stderr - testsuite/tests/typecheck/should_compile/T13651.hs - − testsuite/tests/typecheck/should_compile/T13651.stderr - + testsuite/tests/typecheck/should_compile/T14745.hs - testsuite/tests/typecheck/should_compile/T25266a.stderr - testsuite/tests/typecheck/should_compile/all.T - testsuite/tests/typecheck/should_compile/hole_constraints_nested.stderr - testsuite/tests/typecheck/should_compile/tc126.hs - testsuite/tests/typecheck/should_fail/AmbigFDs.hs - − testsuite/tests/typecheck/should_fail/AmbigFDs.stderr - testsuite/tests/typecheck/should_fail/FD3.stderr - testsuite/tests/typecheck/should_fail/FDsFromGivens2.stderr - testsuite/tests/typecheck/should_fail/T13506.stderr - testsuite/tests/typecheck/should_fail/T16512a.stderr - testsuite/tests/typecheck/should_fail/T18851b.hs - − testsuite/tests/typecheck/should_fail/T18851b.stderr - testsuite/tests/typecheck/should_fail/T18851c.hs - − testsuite/tests/typecheck/should_fail/T18851c.stderr - testsuite/tests/typecheck/should_fail/T19415.stderr - testsuite/tests/typecheck/should_fail/T19415b.stderr - testsuite/tests/typecheck/should_fail/T22684.stderr - + testsuite/tests/typecheck/should_fail/T23162a.hs - + testsuite/tests/typecheck/should_fail/T23162a.stderr - testsuite/tests/typecheck/should_fail/T25325.stderr - testsuite/tests/typecheck/should_fail/T5246.stderr - testsuite/tests/typecheck/should_fail/T5978.stderr - testsuite/tests/typecheck/should_fail/T7368a.stderr - testsuite/tests/typecheck/should_fail/T7696.stderr - testsuite/tests/typecheck/should_fail/T8603.stderr - testsuite/tests/typecheck/should_fail/T9612.stderr - testsuite/tests/typecheck/should_fail/TcStaticPointersFail03.stderr - testsuite/tests/typecheck/should_fail/all.T - testsuite/tests/typecheck/should_fail/tcfail122.stderr - testsuite/tests/typecheck/should_fail/tcfail143.stderr - utils/jsffi/dyld.mjs The diff was not included because it is too large. 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