Marge Bot pushed to branch wip/marge_bot_batch_merge_job at Glasgow Haskell Compiler / GHC

Commits:

• 42fba2df
  by aparker at 2026-04-20T00:57:05-04:00

  NCG: Implement constant folding for vector simd ops (Issue #25030)
  

• 0962dc2a
  by sheaf at 2026-04-20T00:57:06-04:00

  Mark some SIMD tests as broken on i386 optllvm
  
  As seen in #25498, several SIMD tests are broken on i386 in the optllvm
  way. This commit marks them as "expect_broken".
  

• bbf4abb9
  by Wolfgang Jeltsch at 2026-04-20T00:57:07-04:00

  Move most of the `System.IO` implementation into `base`
  
  This involves a rewrite of the `combine` helper function to avoid the
  use of `last`, which would now be flagged as an error.
  
  Metric Decrease:
      LinkableUsage01
      T3294
  Metric Increase:
      T12227
      T12707
      T5642
  

34 changed files:

• + changelog.d/simd_constant_folding
• compiler/GHC/Cmm/Opt.hs
• compiler/GHC/Utils/Misc.hs
• libraries/base/src/Control/Concurrent.hs
• libraries/base/src/GHC/IO/Handle.hs
• libraries/base/src/Prelude.hs
• libraries/base/src/System/IO.hs
• libraries/base/src/Text/Printf.hs
• libraries/ghc-internal/src/GHC/Internal/System/IO.hs
• 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
• + testsuite/tests/simd/should_run/Makefile
• + testsuite/tests/simd/should_run/T25030.hs
• + testsuite/tests/simd/should_run/T25030.stdout
• testsuite/tests/simd/should_run/all.T
• testsuite/tests/typecheck/should_compile/T9497a.stderr
• testsuite/tests/typecheck/should_compile/holes.stderr
• testsuite/tests/typecheck/should_compile/holes3.stderr
• testsuite/tests/typecheck/should_compile/valid_hole_fits.stderr
• testsuite/tests/typecheck/should_fail/T9497d.stderr
• testsuite/tests/typecheck/should_run/T9497a-run.stderr
• testsuite/tests/typecheck/should_run/T9497b-run.stderr
• testsuite/tests/typecheck/should_run/T9497c-run.stderr
• utils/haddock/html-test/ref/Bug1004.html
• utils/haddock/html-test/ref/Bug973.html
• utils/haddock/html-test/ref/ConstructorPatternExport.html
• utils/haddock/html-test/ref/DefaultSignatures.html
• utils/haddock/html-test/ref/Hash.html
• utils/haddock/html-test/ref/PatternSyns.html
• utils/haddock/html-test/ref/PatternSyns2.html
• utils/haddock/html-test/ref/QuasiExpr.html
• utils/haddock/html-test/ref/Test.html

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