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teach dag combiner how to eliminate MERGE_VALUES nodes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47052 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -137,6 +137,7 @@ namespace {
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// otherwise - N should be replaced by the returned Operand.
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//
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SDOperand visitTokenFactor(SDNode *N);
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SDOperand visitMERGE_VALUES(SDNode *N);
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SDOperand visitADD(SDNode *N);
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SDOperand visitSUB(SDNode *N);
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SDOperand visitADDC(SDNode *N);
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@ -662,6 +663,7 @@ SDOperand DAGCombiner::visit(SDNode *N) {
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switch(N->getOpcode()) {
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default: break;
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case ISD::TokenFactor: return visitTokenFactor(N);
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case ISD::MERGE_VALUES: return visitMERGE_VALUES(N);
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case ISD::ADD: return visitADD(N);
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case ISD::SUB: return visitSUB(N);
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case ISD::ADDC: return visitADDC(N);
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@ -837,6 +839,18 @@ SDOperand DAGCombiner::visitTokenFactor(SDNode *N) {
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return Result;
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}
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/// MERGE_VALUES can always be eliminated.
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SDOperand DAGCombiner::visitMERGE_VALUES(SDNode *N) {
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WorkListRemover DeadNodes(*this);
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for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
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DAG.ReplaceAllUsesOfValueWith(SDOperand(N, i), N->getOperand(i),
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&DeadNodes);
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removeFromWorkList(N);
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DAG.DeleteNode(N);
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return SDOperand(N, 0); // Return N so it doesn't get rechecked!
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}
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static
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SDOperand combineShlAddConstant(SDOperand N0, SDOperand N1, SelectionDAG &DAG) {
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MVT::ValueType VT = N0.getValueType();
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