[all-commits] [llvm/llvm-project] 3a0c33: [msan] Handle Arm NEON pairwise min/max instructio...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3a0c33afd1b3085d958e89c1c0c8a8b8c0f34739
      https://github.com/llvm/llvm-project/commit/3a0c33afd1b3085d958e89c1c0c8a8b8c0f34739
  Author: Thurston Dang <thurston at google.com>
  Date:   2025-03-08 (Sat, 08 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
    M llvm/test/Instrumentation/MemorySanitizer/AArch64/arm64-vmax.ll

  Log Message:
  -----------
  [msan] Handle Arm NEON pairwise min/max instructions (#129824)

Change the handling of:
- llvm.aarch64.neon.fmaxp
- llvm.aarch64.neon.fminp
- llvm.aarch64.neon.fmaxnmp
- llvm.aarch64.neon.fminnmp
- llvm.aarch64.neon.smaxp
- llvm.aarch64.neon.sminp
- llvm.aarch64.neon.umaxp
- llvm.aarch64.neon.uminp
from the incorrect heuristic handler (maybeHandleSimpleNomemIntrinsic)
to handlePairwiseShadowOrIntrinsic.

Updates the tests from https://github.com/llvm/llvm-project/pull/129760

Adds a note that maybeHandleSimpleNomemIntrinsic may incorrectly match
horizontal/pairwise intrinsics.



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