[all-commits] [llvm/llvm-project] 4a4260: [msan] Use horizontal add to compute shadow for ho...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4a426079d60a664419dfc98855a798c4103fbbf0
      https://github.com/llvm/llvm-project/commit/4a426079d60a664419dfc98855a798c4103fbbf0
  Author: Thurston Dang <thurston at google.com>
  Date:   2025-01-28 (Tue, 28 Jan 2025)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
    M llvm/test/Instrumentation/MemorySanitizer/X86/avx-intrinsics-x86.ll
    M llvm/test/Instrumentation/MemorySanitizer/X86/avx2-intrinsics-x86.ll
    M llvm/test/Instrumentation/MemorySanitizer/X86/mmx-intrinsics.ll
    M llvm/test/Instrumentation/MemorySanitizer/i386/avx-intrinsics-i386.ll
    M llvm/test/Instrumentation/MemorySanitizer/i386/avx2-intrinsics-i386.ll
    M llvm/test/Instrumentation/MemorySanitizer/i386/mmx-intrinsics.ll

  Log Message:
  -----------
  [msan] Use horizontal add to compute shadow for horizontal sub (#124835)

This improves the horizontal sub handling (from
https://github.com/llvm/llvm-project/pull/124159), by always using
horizontal add for the shadow, as recommended by Vitaly.

Fixes https://github.com/llvm/llvm-project/issues/124662



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