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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 | 1144af3c9b4da48cd581156e05b24261c8de366a (patch) | |
| tree | 49da576a97bfdab702528643450798baa54c790f /lib/Analysis/ValueTracking.cpp | |
| parent | cac59d8ae815596f4f6b77d1a5414c0591168ea5 (diff) | |
Fix integer undefined behavior due to signed left shift overflow in LLVM.
Reviewed offline by chandlerc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162623 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Analysis/ValueTracking.cpp')
| -rw-r--r-- | lib/Analysis/ValueTracking.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp index cea34e16e7..491224a4b6 100644 --- a/lib/Analysis/ValueTracking.cpp +++ b/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); } |