[all-commits] [llvm/llvm-project] efc8f3: [msan] Set cmpxchg shadow precisely

[Z via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: efc8f3311b57ce438500d8a0908e6c7cf6c9f551
      https://github.com/llvm/llvm-project/commit/efc8f3311b57ce438500d8a0908e6c7cf6c9f551
  Author: Jianzhou Zhao <jianzhouzh at google.com>
  Date:   2021-02-19 (Fri, 19 Feb 2021)

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

  Log Message:
  -----------
  [msan] Set cmpxchg shadow precisely

In terms of https://llvm.org/docs/LangRef.html#cmpxchg-instruction,
the return type of chmpxchg is a pair {ty, i1}, while I think we
only wanted to set the shadow for the address 0th op, and it has type
ty.

Reviewed-by: eugenis

Differential Revision: https://reviews.llvm.org/D97029