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Lower READCYCLECOUNTER correctly, preserving the chain result
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24438 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -920,10 +920,14 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
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std::vector<SDOperand> Ops;
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Ops.push_back(Op.getOperand(0));
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SDOperand rd = DAG.getNode(X86ISD::RDTSC_DAG, Tys, Ops);
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SDOperand Lo = DAG.getCopyFromReg(rd, X86::EAX, MVT::i32, rd.getValue(1));
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SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), X86::EDX,
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MVT::i32, Lo.getValue(2));
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return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
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Ops.clear();
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Ops.push_back(DAG.getCopyFromReg(rd, X86::EAX, MVT::i32, rd.getValue(1)));
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Ops.push_back(DAG.getCopyFromReg(Ops[0].getValue(1), X86::EDX,
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MVT::i32, Ops[0].getValue(2)));
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Ops.push_back(Ops[1].getValue(1));
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Tys[0] = Tys[1] = MVT::i32;
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Tys.push_back(MVT::Other);
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return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops);
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}
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}
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}
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