[all-commits] [llvm/llvm-project] 7bd9c7: [msan][NFCI] Generalize handleIntrinsicByApplyingT...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7bd9c780e36399394fe8eae9678eb448d53e33f0
      https://github.com/llvm/llvm-project/commit/7bd9c780e36399394fe8eae9678eb448d53e33f0
  Author: Thurston Dang <thurston at google.com>
  Date:   2025-01-28 (Tue, 28 Jan 2025)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp

  Log Message:
  -----------
  [msan][NFCI] Generalize handleIntrinsicByApplyingToShadow to allow alternative intrinsic for shadows (#124831)

https://github.com/llvm/llvm-project/pull/124159 uses
handleIntrinsicByApplyingToShadow for horizontal add/sub, but Vitaly
recommends always using the add version to avoid false negatives for
fully uninitialized data
(https://github.com/llvm/llvm-project/issues/124662).

This patch lays the groundwork by generalizing
handleIntrinsicByApplyingToShadow to allow using a different intrinsic
(of the same type as the original intrinsic) for the shadow. Planned
work will apply it to horizontal sub.



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