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Lower READCYCLECOUNTER correctly, preserving the chain result 

llvm-svn: 24438
This commit is contained in:
Chris Lattner 2005-11-20 22:57:19 +00:00
parent 44c28c22b7
commit 6c1ca888d4
1 changed files with 8 additions and 4 deletions
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12
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -920,10 +920,14 @@ SDOperand X86TargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
std::vector<SDOperand> Ops;
Ops.push_back(Op.getOperand(0));
SDOperand rd = DAG.getNode(X86ISD::RDTSC_DAG, Tys, Ops);
SDOperand Lo = DAG.getCopyFromReg(rd, X86::EAX, MVT::i32, rd.getValue(1));
SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), X86::EDX,
MVT::i32, Lo.getValue(2));
return DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
Ops.clear();
Ops.push_back(DAG.getCopyFromReg(rd, X86::EAX, MVT::i32, rd.getValue(1)));
Ops.push_back(DAG.getCopyFromReg(Ops[0].getValue(1), X86::EDX,
MVT::i32, Ops[0].getValue(2)));
Ops.push_back(Ops[1].getValue(1));
Tys[0] = Tys[1] = MVT::i32;
Tys.push_back(MVT::Other);
return DAG.getNode(ISD::MERGE_VALUES, Tys, Ops);
}
}
}