[all-commits] [llvm/llvm-project] 96336b: [AggressiveInstCombine] Improve popcount matching ...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 96336b233068a04b84915334af01eda3d571e301
      https://github.com/llvm/llvm-project/commit/96336b233068a04b84915334af01eda3d571e301
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2025-06-03 (Tue, 03 Jun 2025)

  Changed paths:
    M llvm/lib/Transforms/AggressiveInstCombine/AggressiveInstCombine.cpp
    M llvm/test/Transforms/AggressiveInstCombine/popcount.ll

  Log Message:
  -----------
  [AggressiveInstCombine] Improve popcount matching if the input has known zero bits (#142501)

If the input has known zero bits, InstCombine may have simplied one
of the expected And masks. Teach AggressiveInstCombine to use
MaskedValueIsZero to recover these missing bits.
    
Fixes #142042.



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