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| author | Richard Smith <richard-llvm@metafoo.co.uk> | 2012-08-24 23:29:28 +0000 |
|---|---|---|
| committer | Richard Smith <richard-llvm@metafoo.co.uk> | 2012-08-24 23:29:28 +0000 |
| commit | 228e6d4cf347820fce53e57c24b266f67a413d85 (patch) | |
| tree | d2b63a5d9cee710515d33361e84ad0988d2c31fa /llvm/lib/Analysis/ValueTracking.cpp | |
| parent | 3d91b43ad22b69408af224a8d67561038705ec55 (diff) | |
| download | bcm5719-llvm-228e6d4cf347820fce53e57c24b266f67a413d85.tar.gz bcm5719-llvm-228e6d4cf347820fce53e57c24b266f67a413d85.zip | |
Fix integer undefined behavior due to signed left shift overflow in LLVM.
Reviewed offline by chandlerc.
llvm-svn: 162623
Diffstat (limited to 'llvm/lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ValueTracking.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp index cea34e16e7b..491224a4b69 100644 --- a/llvm/lib/Analysis/ValueTracking.cpp +++ b/llvm/lib/Analysis/ValueTracking.cpp @@ -1614,7 +1614,7 @@ Value *llvm::GetPointerBaseWithConstantOffset(Value *Ptr, int64_t &Offset, // right. unsigned PtrSize = TD.getPointerSizeInBits(); if (PtrSize < 64) - Offset = (Offset << (64-PtrSize)) >> (64-PtrSize); + Offset = SignExtend64(Offset, PtrSize); return GetPointerBaseWithConstantOffset(GEP->getPointerOperand(), Offset, TD); } |
