[all-commits] [llvm/llvm-project] 5c3784: [NFC][AMDGPU] Add test for unfold-masked-merge-sca...

[Harrison Hao via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5c3784023fcfa608d24364ca11cd688c5805a55e
      https://github.com/llvm/llvm-project/commit/5c3784023fcfa608d24364ca11cd688c5805a55e
  Author: Harrison Hao <57025411+harrisonGPU at users.noreply.github.com>
  Date:   2025-05-20 (Tue, 20 May 2025)

  Changed paths:
    A llvm/test/CodeGen/AMDGPU/unfold-masked-merge-scalar-variablemask.ll

  Log Message:
  -----------
  [NFC][AMDGPU] Add test for unfold-masked-merge-scalar-variablemask.ll (#140093)

This enables DAGCombine to recognize and form and_not + or patterns when
hasAndNot is true, allowing better SALU codegen for masked merge idioms.
For example:
(A & (B ^ C)) ^ C → (A & B) | (~A & C)

References:
* https://reviews.llvm.org/D45563#change-EG4Z6zDTofCc
* https://bugs.llvm.org/show_bug.cgi?id=6773
* https://graphics.stanford.edu/~seander/bithacks.html#MaskedMerge



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