[all-commits] [llvm/llvm-project] 6c3af7: AtomicExpand: Stop trying to prune cmpxchg extract...

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/atomic-expand-remove-prune
  Home:   https://github.com/llvm/llvm-project
  Commit: 6c3af75b41ef54b831f3886bc62171127369467e
      https://github.com/llvm/llvm-project/commit/6c3af75b41ef54b831f3886bc62171127369467e
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2024-08-13 (Tue, 13 Aug 2024)

  Changed paths:
    M llvm/lib/CodeGen/AtomicExpandPass.cpp
    M llvm/test/Transforms/AtomicExpand/ARM/cmpxchg-weak.ll

  Log Message:
  -----------
  AtomicExpand: Stop trying to prune cmpxchg extractvalue users

The expansion for cmpxchg was trying to tidy up extractvalue users
to directly use the lowered pieces, and then erasing the now dead
extractvalues. This was making an assumption about the iteration
order did not depend on those user instructions.

Continue doing the replacement, but just leave the dead extractvalues.
This is a minor regression, but it is of no importance since the
dead instructions will just get dropped during codegen anyway.



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