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| author | Matt Morehouse <mascasa@google.com> | 2018-09-19 19:37:24 +0000 |
|---|---|---|
| committer | Matt Morehouse <mascasa@google.com> | 2018-09-19 19:37:24 +0000 |
| commit | e62fc3d0b6ce923dcbc29eeb6ebc5808e6724f90 (patch) | |
| tree | e5fadc259b3b063b9ddb6a12d82ce1c5b67a9c81 /llvm/lib/Transforms/Utils | |
| parent | a4526d77c9921c86a29889fc09de17f7d5ccb210 (diff) | |
| download | bcm5719-llvm-e62fc3d0b6ce923dcbc29eeb6ebc5808e6724f90.tar.gz bcm5719-llvm-e62fc3d0b6ce923dcbc29eeb6ebc5808e6724f90.zip | |
[InstCombine] Disable strcmp->memcmp transform for MSan.
Summary:
The strcmp->memcmp transform can make the resulting memcmp read
uninitialized data, which MSan doesn't like.
Resolves https://github.com/google/sanitizers/issues/993.
Reviewers: eugenis, xbolva00
Reviewed By: eugenis
Subscribers: hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D52272
llvm-svn: 342582
Diffstat (limited to 'llvm/lib/Transforms/Utils')
| -rw-r--r-- | llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp index 8fa227930b4..3789181a898 100644 --- a/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp +++ b/llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp @@ -171,7 +171,10 @@ static bool canTransformToMemCmp(CallInst *CI, Value *Str, uint64_t Len, if (!isDereferenceableAndAlignedPointer(Str, 1, APInt(64, Len), DL)) return false; - + + if (CI->getFunction()->hasFnAttribute(Attribute::SanitizeMemory)) + return false; + return true; } |
