diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 9d77d75ae00..2298eb096da 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -1578,6 +1578,7 @@ X86TargetLowering::X86TargetLowering(const X86TargetMachine &TM, // Support carry in as value rather than glue. setOperationAction(ISD::ADDCARRY, VT, Custom); setOperationAction(ISD::SUBCARRY, VT, Custom); + setOperationAction(ISD::SETCCCARRY, VT, Custom); } if (!Subtarget.is64Bit()) { @@ -17413,6 +17414,30 @@ SDValue X86TargetLowering::LowerSETCCE(SDValue Op, SelectionDAG &DAG) const { return SetCC; } +SDValue X86TargetLowering::LowerSETCCCARRY(SDValue Op, SelectionDAG &DAG) const { + SDValue LHS = Op.getOperand(0); + SDValue RHS = Op.getOperand(1); + SDValue Carry = Op.getOperand(2); + SDValue Cond = Op.getOperand(3); + SDLoc DL(Op); + + assert(LHS.getSimpleValueType().isInteger() && "SETCCCARRY is integer only."); + X86::CondCode CC = TranslateIntegerX86CC(cast<CondCodeSDNode>(Cond)->get()); + + // Recreate the carry if needed. + EVT CarryVT = Carry.getValueType(); + APInt NegOne = APInt::getAllOnesValue(CarryVT.getScalarSizeInBits()); + Carry = DAG.getNode(X86ISD::ADD, DL, DAG.getVTList(CarryVT, MVT::i32), + Carry, DAG.getConstant(NegOne, DL, CarryVT)); + + SDVTList VTs = DAG.getVTList(LHS.getValueType(), MVT::i32); + SDValue Cmp = DAG.getNode(X86ISD::SBB, DL, VTs, LHS, RHS, Carry.getValue(1)); + SDValue SetCC = getSETCC(CC, Cmp.getValue(1), DL, DAG); + if (Op.getSimpleValueType() == MVT::i1) + return DAG.getNode(ISD::TRUNCATE, DL, MVT::i1, SetCC); + return SetCC; +} + /// Return true if opcode is a X86 logical comparison. static bool isX86LogicalCmp(SDValue Op) { unsigned Opc = Op.getOpcode(); @@ -23782,6 +23807,7 @@ SDValue X86TargetLowering::LowerOperation(SDValue Op, SelectionDAG &DAG) const { case ISD::FGETSIGN: return LowerFGETSIGN(Op, DAG); case ISD::SETCC: return LowerSETCC(Op, DAG); case ISD::SETCCE: return LowerSETCCE(Op, DAG); + case ISD::SETCCCARRY: return LowerSETCCCARRY(Op, DAG); case ISD::SELECT: return LowerSELECT(Op, DAG); case ISD::BRCOND: return LowerBRCOND(Op, DAG); case ISD::JumpTable: return LowerJumpTable(Op, DAG); |
