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Make sure we don't return bits outside the mask in ComputeMaskedBits. PR12189.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152066 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman
2012-03-05 23:09:40 +00:00
parent c3384c93c0
commit 049d08f5c9
2 changed files with 24 additions and 2 deletions
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lib/Analysis/ValueTracking.cpp
+2 -2
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@@ -691,8 +691,8 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
if (P->hasConstantValue() == P)
break;
KnownZero = APInt::getAllOnesValue(BitWidth);
KnownOne = APInt::getAllOnesValue(BitWidth);
KnownZero = Mask;
KnownOne = Mask;
for (unsigned i = 0, e = P->getNumIncomingValues(); i != e; ++i) {
// Skip direct self references.
if (P->getIncomingValue(i) == P) continue;