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Fix add/sub expansion: don't create ADD / SUB with two results (seems like everyone is doing this these days :-). Patch by Daniel M Gessel!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60958 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-12-12 18:49:09 +00:00
parent 8bdc6920cd
commit 637ed03173
1 changed files with 5 additions and 5 deletions
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10
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -6862,7 +6862,6 @@ void SelectionDAGLegalize::ExpandOp(SDValue Op, SDValue &Lo, SDValue &Hi){
SDValue LHSL, LHSH, RHSL, RHSH;
ExpandOp(Node->getOperand(0), LHSL, LHSH);
ExpandOp(Node->getOperand(1), RHSL, RHSH);
SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Flag);
SDValue LoOps[2], HiOps[3];
LoOps[0] = LHSL;
LoOps[1] = RHSL;
@ -6881,6 +6880,7 @@ void SelectionDAGLegalize::ExpandOp(SDValue Op, SDValue &Lo, SDValue &Hi){
}
if(hasCarry) {
SDVTList VTList = DAG.getVTList(LHSL.getValueType(), MVT::Flag);
if (Node->getOpcode() == ISD::ADD) {
Lo = DAG.getNode(ISD::ADDC, VTList, LoOps, 2);
HiOps[2] = Lo.getValue(1);
@ -6893,8 +6893,8 @@ void SelectionDAGLegalize::ExpandOp(SDValue Op, SDValue &Lo, SDValue &Hi){
break;
} else {
if (Node->getOpcode() == ISD::ADD) {
Lo = DAG.getNode(ISD::ADD, VTList, LoOps, 2);
Hi = DAG.getNode(ISD::ADD, VTList, HiOps, 2);
Lo = DAG.getNode(ISD::ADD, NVT, LoOps, 2);
Hi = DAG.getNode(ISD::ADD, NVT, HiOps, 2);
SDValue Cmp1 = DAG.getSetCC(TLI.getSetCCResultType(Lo),
Lo, LoOps[0], ISD::SETULT);
SDValue Carry1 = DAG.getNode(ISD::SELECT, NVT, Cmp1,
@ -6907,8 +6907,8 @@ void SelectionDAGLegalize::ExpandOp(SDValue Op, SDValue &Lo, SDValue &Hi){
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);
Lo = DAG.getNode(ISD::SUB, NVT, LoOps, 2);
Hi = DAG.getNode(ISD::SUB, NVT, 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),