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allow custom lowering to return null for legal results
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25007 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1956,11 +1956,6 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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break;
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}
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switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))) {
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case TargetLowering::Legal:
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if (Tmp1 != Node->getOperand(0) ||
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Tmp2 != Node->getOperand(1))
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Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1,Tmp2);
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break;
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case TargetLowering::Custom: {
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Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1, Tmp2);
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SDOperand Tmp = TLI.LowerOperation(Result, DAG);
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@ -1968,9 +1963,13 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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Tmp = LegalizeOp(Tmp); // Relegalize input.
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AddLegalizedOperand(Op, Tmp);
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return Tmp;
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}
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break;
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} //else it was considered legal and we fall through
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}
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case TargetLowering::Legal:
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if (Tmp1 != Node->getOperand(0) ||
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Tmp2 != Node->getOperand(1))
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Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1,Tmp2);
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break;
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default:
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assert(0 && "Operation not supported");
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}
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@ -2007,6 +2006,15 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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Tmp1 = LegalizeOp(Node->getOperand(0)); // LHS
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Tmp2 = LegalizeOp(Node->getOperand(1)); // RHS
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switch (TLI.getOperationAction(Node->getOpcode(), Node->getValueType(0))) {
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case TargetLowering::Custom: {
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Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1, Tmp2);
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SDOperand Tmp = TLI.LowerOperation(Result, DAG);
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if (Tmp.Val) {
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Tmp = LegalizeOp(Tmp); // Relegalize input.
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AddLegalizedOperand(Op, Tmp);
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return Tmp;
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} //else it was considered legal and we fall through
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}
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case TargetLowering::Legal:
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if (Tmp1 != Node->getOperand(0) ||
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Tmp2 != Node->getOperand(1))
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@ -2015,16 +2023,6 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
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break;
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case TargetLowering::Promote:
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assert(0 && "Cannot promote handle this yet!");
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case TargetLowering::Custom: {
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Result = DAG.getNode(Node->getOpcode(), Node->getValueType(0), Tmp1, Tmp2);
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SDOperand Tmp = TLI.LowerOperation(Result, DAG);
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if (Tmp.Val) {
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Tmp = LegalizeOp(Tmp); // Relegalize input.
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AddLegalizedOperand(Op, Tmp);
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return Tmp;
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}
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break;
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}
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case TargetLowering::Expand:
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if (MVT::isInteger(Node->getValueType(0))) {
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MVT::ValueType VT = Node->getValueType(0);
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