[all-commits] [llvm/llvm-project] 43d4cb: 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: 43d4cb7e4bf7c20ddfd03caf2e63cf6a03bfa24c
      https://github.com/llvm/llvm-project/commit/43d4cb7e4bf7c20ddfd03caf2e63cf6a03bfa24c
  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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