Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC Commits: ecd2b759 by sheaf at 2026-11-02T12:49:00-05:00 Consolidate all CPU feature handling This commit introduces GHC.Platform.CpuFeatures which consolidates all of the logic for implications between CPU feature flags (mainly X86): - DynFlags now only records the set of -m<feature> flags that were passed, as an EnumSet CpuFeature. That keeps it a simple record of the flags the user passed, with no post-processing. - GHC.Platform.CpuFeatures.initCpuFeatures turns this set into a CpuFeatures value, applying all implications and the per-architecture baseline. This is the single home for all of the feature implication logic. Some datatypes were reworked to better reflect the implication structure in the types, e.g. SseAvxVersion has a strategically placed 'FMA' boolean. - The NCG, LLVM backend, StgToCmm, CPP defines and LLVM -mattr flags all consult CpuFeatures, via targetCpuFeatures. See Note [CPU features], which replaces Note [Implications between X86 CPU feature flags]. Behaviour changes: - x86 feature flags (-msse3, -mavx, -mavx512*, -mgfni, ...) passed when targeting a non-x86 architecture no longer cause x86 CPP macros (__SSE3__, __AVX512BW__, __GFNI__, ...) to be defined, nor x86 attributes to be passed to LLVM. - Error messages reported when required CPU features are not enabled now print out the minimal set of flags required (e.g. "-mavx512vl" rather than "-mavx512f -mavx512vl"). - - - - - cc7b5276 by Luite Stegeman at 2026-11-02T12:49:15-05:00 rts: move stack check to the start of the stg_unpack_cstring thunks fixes a deadlock see #27272 - - - - - afa31101 by Simon Jakobi at 2026-11-02T12:49:16-05:00 Cmm: exclude the entry block from common block elimination a1d8139054c had fixed #27722 only partially, because it didn't prevent elimination of the entry block in later rounds, where the entry block is no longer guaranteed to come first. To close this loophole, we exclude the entry block from the CBE merge logic. See Note [Retain entry block during common block elimination] for details. This also deletes a misleading comment regarding unreachable blocks: the control-flow optimiser doesn't actually guarantee that no unreachable blocks reach CBE. Fixes #27722. Assisted-by: Claude Fable 5.1 - - - - - f70da46a by Alan Zimmerman at 2026-11-02T12:49:16-05:00 EPA: Use AnnList for GADT declarations Continuing the process of using AnnList to capture parser layout - - - - - 44 changed files: - changelog.d/T27722-cbe-entry-block.md - + changelog.d/caf-deadlock-27272 - compiler/GHC/Cmm/CallConv.hs - compiler/GHC/Cmm/CommonBlockElim.hs - compiler/GHC/CmmToAsm/Config.hs - compiler/GHC/CmmToAsm/X86/CodeGen.hs - compiler/GHC/CmmToAsm/X86/Instr.hs - compiler/GHC/CmmToLlvm/CodeGen.hs - compiler/GHC/CmmToLlvm/Config.hs - compiler/GHC/Driver/Config/CmmToAsm.hs - compiler/GHC/Driver/Config/CmmToLlvm.hs - compiler/GHC/Driver/Config/StgToCmm.hs - compiler/GHC/Driver/DynFlags.hs - compiler/GHC/Driver/Pipeline/Execute.hs - compiler/GHC/Driver/Session.hs - compiler/GHC/Hs/Decls.hs - compiler/GHC/Hs/Dump.hs - compiler/GHC/Parser.y - compiler/GHC/Parser/PostProcess.hs - compiler/GHC/Platform.hs - + compiler/GHC/Platform/CpuFeatures.hs - compiler/GHC/StgToCmm/Config.hs - compiler/GHC/StgToCmm/Prim.hs - compiler/GHC/SysTools/Cpp.hs - compiler/ghc.cabal.in - rts/StgStdThunks.cmm - + testsuite/tests/cmm/should_run/T27722.hs - + testsuite/tests/cmm/should_run/T27722_cmm.cmm - testsuite/tests/cmm/should_run/all.T - testsuite/tests/count-deps/CountDepsParser.stdout - testsuite/tests/ghc-api/exactprint/Test20239.stderr - testsuite/tests/haddock/should_compile_flag_haddock/T17544.stderr - testsuite/tests/haddock/should_compile_flag_haddock/T17544_kw.stderr - testsuite/tests/haddock/should_compile_flag_haddock/T24221.stderr - testsuite/tests/parser/should_compile/DumpParsedAst.stderr - testsuite/tests/parser/should_compile/DumpRenamedAst.stderr - testsuite/tests/parser/should_compile/T14189.stderr - testsuite/tests/parser/should_compile/T15323.stderr - testsuite/tests/parser/should_compile/T20452.stderr - testsuite/tests/printer/T18791.stderr - + testsuite/tests/rts/T27272.hs - + testsuite/tests/rts/T27272_gen.py - testsuite/tests/rts/all.T - utils/check-exact/ExactPrint.hs The diff was not included because it is too large. View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/1130173e2fb27864061e1b211912fee... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/compare/1130173e2fb27864061e1b211912fee... 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