[all-commits] [llvm/llvm-project] 51d825: [msan] Handle Arm NEON saturating extract and narr...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 51d82552037290f9368a43ef7a6e4e642b8c28f4
      https://github.com/llvm/llvm-project/commit/51d82552037290f9368a43ef7a6e4e642b8c28f4
  Author: Thurston Dang <thurston at google.com>
  Date:   2025-02-12 (Wed, 12 Feb 2025)

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

  Log Message:
  -----------
  [msan] Handle Arm NEON saturating extract and narrow (#125742)

This handles NEON saturating extract and narrow (Intrinsic::aarch64_neon_{sqxtn, sqxtun, uqxtn}) by (ab)using handleShadowOr() to perform the shadow cast. Previously, these were unknown intrinsics handled suboptimally by visitInstruction.

Updates the tests from https://github.com/llvm/llvm-project/pull/125288 and https://github.com/llvm/llvm-project/pull/125140



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