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);