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Use Dan's supperior check 

llvm-svn: 57255
This commit is contained in:
Andrew Lenharth 2008-10-07 18:27:23 +00:00
parent 5aa1cc4065
commit 21dca9cbb1
1 changed files with 9 additions and 13 deletions
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22
llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -6441,22 +6441,18 @@ void SelectionDAGLegalize::ExpandOp(SDValue Op, SDValue &Lo, SDValue &Hi){
LoOps[1] = RHSL;
HiOps[0] = LHSH;
HiOps[1] = RHSH;
//cascaded check to see if any smaller size has a a carry flag.
unsigned OpV = Node->getOpcode() == ISD::ADD ? ISD::ADDC : ISD::SUBC;
bool hasCarry = false;
if (NVT == MVT::i64)
hasCarry = TLI.isOperationLegal(OpV, MVT::i64)
| TLI.isOperationLegal(OpV, MVT::i32)
| TLI.isOperationLegal(OpV, MVT::i16)
| TLI.isOperationLegal(OpV, MVT::i8);
if (NVT == MVT::i32)
hasCarry = TLI.isOperationLegal(OpV, MVT::i32)
| TLI.isOperationLegal(OpV, MVT::i16)
| TLI.isOperationLegal(OpV, MVT::i8);
if (NVT == MVT::i16)
hasCarry = TLI.isOperationLegal(OpV, MVT::i16)
| TLI.isOperationLegal(OpV, MVT::i8);
for (unsigned BitSize = NVT.getSizeInBits(); BitSize != 0; BitSize /= 2) {
MVT AVT = MVT::getIntegerVT(BitSize);
if (TLI.isOperationLegal(OpV, AVT)) {
hasCarry = true;
break;
}
}
if(hasCarry) {
if (Node->getOpcode() == ISD::ADD) {
Lo = DAG.getNode(ISD::ADDC, VTList, LoOps, 2);