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Fix a bug where we would corrupt the offset when evaluating

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a non-constant GEP.

I don't have any test case that demonstrates this, Nadav (indirectly)
pointed this out in code review. I'm not sure how possible it is to
contrive a test case for the current users of this code that triggers
the bad issue sadly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189188 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2013-08-25 10:46:39 +00:00
parent b31eebd3fd
commit c99a0d8586
1 changed files with 3 additions and 1 deletions
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4
lib/IR/Value.cpp
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@ -411,8 +411,10 @@ Value *Value::stripAndAccumulateInBoundsConstantOffsets(const DataLayout &DL,
if (GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
if (!GEP->isInBounds())
return V;
if (!GEP->accumulateConstantOffset(DL, Offset))
APInt GEPOffset(Offset);
if (!GEP->accumulateConstantOffset(DL, GEPOffset))
return V;
Offset = GEPOffset;
V = GEP->getPointerOperand();
} else if (Operator::getOpcode(V) == Instruction::BitCast) {
V = cast<Operator>(V)->getOperand(0);