Simon Peyton Jones pushed to branch wip/T26772 at Glasgow Haskell Compiler / GHC

Commits:

• 56db94f7
  by Peter Trommler at 2026-01-26T11:26:18+01:00

  PPC NCG: Generate clear right insn at arch width
  
  The clear right immediate (clrrxi) is only available in word and
  doubleword width. Generate clrrxi instructions at architecture
  width for all MachOp widths.
  
  Fixes #24145
  

• 5957a8ad
  by Wolfgang Jeltsch at 2026-01-27T06:11:40-05:00

  Add operations for obtaining operating-system handles
  
  This contribution implements CLC proposal #369. It adds operations for
  obtaining POSIX file descriptors and Windows handles that underlie
  Haskell handles. Those operating system handles can also be obtained
  without such additional operations, but this is more involved and, more
  importantly, requires using internals.
  

• 86a0510c
  by Greg Steuck at 2026-01-27T06:12:34-05:00

  Move flags to precede patterns for grep and read files directly
  
  This makes the tests pass with non-GNU (i.e. POSIX-complicant) tools.
  There's no reason to use cat and pipe where direct file argument works.
  

• efa4b101
  by Simon Peyton Jones at 2026-01-27T16:56:38+00:00

  Fix subtle bug in GHC.Core.Utils.mkTick
  
  ..Proper commit message still to come...
  

• a4f9eb90
  by Simon Peyton Jones at 2026-01-27T16:56:38+00:00

  Modify the debug-trace a little
  

• 575a61a9
  by Simon Peyton Jones at 2026-01-27T16:56:38+00:00

  Fix long-standing interaction between ticks and casts
  
  The code for Note [Eliminate Identity Cases] was simply wrong when
  ticks and casts interacted.  This patch fixes the interaction.
  
  It was shown up when validating #26772, although it's not the exactly
  the bug that's reported by #26772.  Nor is it easy to reproduce, hence
  no regression test.
  

31 changed files:

• compiler/GHC/CmmToAsm/PPC/CodeGen.hs
• compiler/GHC/Core/Opt/Simplify/Iteration.hs
• compiler/GHC/Core/Opt/Simplify/Utils.hs
• compiler/GHC/Core/Utils.hs
• compiler/GHC/Tc/Instance/Class.hs
• compiler/GHC/Tc/Types/Evidence.hs
• libraries/base/base.cabal.in
• libraries/base/changelog.md
• + libraries/base/src/System/IO/OS.hs
• libraries/base/tests/IO/all.T
• + libraries/base/tests/IO/osHandles001FileDescriptors.hs
• + libraries/base/tests/IO/osHandles001FileDescriptors.stdout
• + libraries/base/tests/IO/osHandles001WindowsHandles.hs
• + libraries/base/tests/IO/osHandles001WindowsHandles.stdout
• + libraries/base/tests/IO/osHandles002FileDescriptors.hs
• + libraries/base/tests/IO/osHandles002FileDescriptors.stderr
• + libraries/base/tests/IO/osHandles002FileDescriptors.stdin
• + libraries/base/tests/IO/osHandles002FileDescriptors.stdout
• + libraries/base/tests/IO/osHandles002WindowsHandles.hs
• + libraries/base/tests/IO/osHandles002WindowsHandles.stderr
• + libraries/base/tests/IO/osHandles002WindowsHandles.stdin
• + libraries/base/tests/IO/osHandles002WindowsHandles.stdout
• libraries/base/tests/perf/Makefile
• libraries/ghc-internal/ghc-internal.cabal.in
• + libraries/ghc-internal/src/GHC/Internal/System/IO/OS.hs
• testsuite/tests/driver/T16318/Makefile
• testsuite/tests/driver/T18125/Makefile
• testsuite/tests/interface-stability/base-exports.stdout
• testsuite/tests/interface-stability/base-exports.stdout-javascript-unknown-ghcjs
• testsuite/tests/interface-stability/base-exports.stdout-mingw32
• testsuite/tests/interface-stability/base-exports.stdout-ws-32

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