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Don't crash on X^X if X is a vector. Instead, produce a vector of zeros. 

llvm-svn: 27229
This commit is contained in:
Chris Lattner 2006-03-28 19:11:05 +00:00
parent ffec47ebff
commit b7163598f9
1 changed files with 10 additions and 2 deletions
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12
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1396,8 +1396,16 @@ SDOperand DAGCombiner::visitXOR(SDNode *N) {
DAG.getConstant(N1C->getValue()^N01C->getValue(), VT));
}
// fold (xor x, x) -> 0
if (N0 == N1)
return DAG.getConstant(0, VT);
if (N0 == N1) {
if (!MVT::isVector(VT)) {
return DAG.getConstant(0, VT);
} else if (!AfterLegalize || TLI.isOperationLegal(ISD::BUILD_VECTOR, VT)) {
// Produce a vector of zeros.
SDOperand El = DAG.getConstant(0, MVT::getVectorBaseType(VT));
std::vector<SDOperand> Ops(MVT::getVectorNumElements(VT), El);
return DAG.getNode(ISD::BUILD_VECTOR, VT, Ops);
}
}
// fold (xor (zext x), (zext y)) -> (zext (xor x, y))
if (N0.getOpcode() == ISD::ZERO_EXTEND &&
N1.getOpcode() == ISD::ZERO_EXTEND &&