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Fix an infinite loop I caused by making sure to legalize the flag operand
of CALLSEQ_* nodes git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25582 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -824,6 +824,13 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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if (Tmp1 != Tmp2)
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Node->setAdjCallChain(Tmp1);
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// If this has a flag input, do legalize it.
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if (Node->getOperand(Node->getNumOperands()-1).getValueType() == MVT::Flag){
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Tmp1 = LegalizeOp(Node->getOperand(Node->getNumOperands()-1));
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if (Tmp1 != Node->getOperand(Node->getNumOperands()-1))
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Node->setAdjCallFlag(Tmp1);
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}
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// Note that we do not create new CALLSEQ_DOWN/UP nodes here. These
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// nodes are treated specially and are mutated in place. This makes the dag
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// legalization process more efficient and also makes libcall insertion
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@ -1365,7 +1372,8 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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Tmp2,
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Node->getOperand(3));
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}
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Node = Result.Val;
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Result = LegalizeOp(Result);
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break;
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}
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switch (getTypeAction(Node->getOperand(1).getValueType())) {
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@ -1276,6 +1276,19 @@ void SDNode::setAdjCallChain(SDOperand N) {
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OperandList[0].Val->Uses.push_back(this);
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}
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// setAdjCallFlag - This method changes the flag input of an
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// CALLSEQ_START/END node to be the specified operand.
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void SDNode::setAdjCallFlag(SDOperand N) {
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assert(N.getValueType() == MVT::Flag);
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assert((getOpcode() == ISD::CALLSEQ_START ||
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getOpcode() == ISD::CALLSEQ_END) && "Cannot adjust this node!");
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SDOperand &FlagOp = OperandList[getNumOperands()-1];
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assert(FlagOp.getValueType() == MVT::Flag);
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FlagOp.Val->removeUser(this);
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FlagOp = N;
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FlagOp.Val->Uses.push_back(this);
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}
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SDOperand SelectionDAG::getLoad(MVT::ValueType VT,
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