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Fix integer undefined behavior due to signed left shift overflow in LLVM.

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Reviewed offline by chandlerc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162623 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Richard Smith
2012-08-24 23:29:28 +00:00
parent cac59d8ae8
commit 1144af3c9b
19 changed files with 59 additions and 56 deletions
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lib/Analysis/ValueTracking.cpp
+1 -1
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@@ -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);
}