+ if (N->getOpcode() == ISD::ADD) {
+ Lo = DAG.getNode(ISD::ADD, VTList, LoOps, 2);
+ Hi = DAG.getNode(ISD::ADD, VTList, HiOps, 2);
+ SDValue Cmp1 = DAG.getSetCC(TLI.getSetCCResultType(Lo), Lo, LoOps[0],
+ ISD::SETULT);
+ SDValue Carry1 = DAG.getNode(ISD::SELECT, NVT, Cmp1,
+ DAG.getConstant(1, NVT),
+ DAG.getConstant(0, NVT));
+ SDValue Cmp2 = DAG.getSetCC(TLI.getSetCCResultType(Lo), Lo, LoOps[1],
+ ISD::SETULT);
+ SDValue Carry2 = DAG.getNode(ISD::SELECT, NVT, Cmp2,
+ DAG.getConstant(1, NVT), Carry1);
+ Hi = DAG.getNode(ISD::ADD, NVT, Hi, Carry2);
+ } else {
+ Lo = DAG.getNode(ISD::SUB, VTList, LoOps, 2);
+ Hi = DAG.getNode(ISD::SUB, VTList, HiOps, 2);
+ SDValue Cmp = DAG.getSetCC(NVT, LoOps[0], LoOps[1], ISD::SETULT);
+ SDValue Borrow = DAG.getNode(ISD::SELECT, NVT, Cmp,
+ DAG.getConstant(1, NVT),
+ DAG.getConstant(0, NVT));
+ Hi = DAG.getNode(ISD::SUB, NVT, Hi, Borrow);
+ }