[all-commits] [llvm/llvm-project] f10979: [msan] Handle llvm.bitreverse by applying intrinsi...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f10979f607fca84c4048bffc57022384baf985c2
      https://github.com/llvm/llvm-project/commit/f10979f607fca84c4048bffc57022384baf985c2
  Author: Thurston Dang <thurston at google.com>
  Date:   2025-02-03 (Mon, 03 Feb 2025)

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

  Log Message:
  -----------
  [msan] Handle llvm.bitreverse by applying intrinsic to shadow (#125606)

llvm.bitreverse was incorrectly handled by the heuristic handler,
because it did not reverse the bits of the shadow.

This updates the instrumentation to use the handler from
https://github.com/llvm/llvm-project/pull/114490 and updates the test
from https://github.com/llvm/llvm-project/pull/125592



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