[all-commits] [llvm/llvm-project] 5b7605: [X86] narrowBitOpRMW - add tests showing failure t...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5b760562dd0d0c33c0cb3632487d14a1837aef17
      https://github.com/llvm/llvm-project/commit/5b760562dd0d0c33c0cb3632487d14a1837aef17
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-10-30 (Thu, 30 Oct 2025)

  Changed paths:
    M llvm/test/CodeGen/X86/bittest-big-integer.ll

  Log Message:
  -----------
  [X86] narrowBitOpRMW - add tests showing failure to fold to BTC/BTR/BTS RMW patterns (#165758)

Failure to fold if the store's chain doesn't directly touch the RMW load
source (we should be using reachesChainWithoutSideEffects to avoid
this).

Failure to fold if the stored value has additional uses (we could update
other uses of the whole stored value to reload after the new narrow
store)



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