diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/Mips/MipsISelLowering.cpp | 33 | ||||
| -rw-r--r-- | lib/Target/Mips/MipsISelLowering.h | 1 |
2 files changed, 33 insertions, 1 deletions
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp index dd569f6..a811005 100644 --- a/lib/Target/Mips/MipsISelLowering.cpp +++ b/lib/Target/Mips/MipsISelLowering.cpp @@ -331,6 +331,7 @@ MipsTargetLowering(MipsTargetMachine &TM) AddPromotedToType(ISD::SETCC, MVT::i1, MVT::i32); // Mips Custom Operations + setOperationAction(ISD::BR_JT, MVT::Other, Custom); setOperationAction(ISD::GlobalAddress, MVT::i32, Custom); setOperationAction(ISD::BlockAddress, MVT::i32, Custom); setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom); @@ -396,7 +397,6 @@ MipsTargetLowering(MipsTargetMachine &TM) setOperationAction(ISD::UREM, MVT::i64, Expand); // Operations not directly supported by Mips. - setOperationAction(ISD::BR_JT, MVT::Other, Expand); setOperationAction(ISD::BR_CC, MVT::Other, Expand); setOperationAction(ISD::SELECT_CC, MVT::Other, Expand); setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand); @@ -1039,6 +1039,7 @@ LowerOperation(SDValue Op, SelectionDAG &DAG) const { switch (Op.getOpcode()) { + case ISD::BR_JT: return LowerBR_JT(Op, DAG); case ISD::BRCOND: return LowerBRCOND(Op, DAG); case ISD::ConstantPool: return LowerConstantPool(Op, DAG); case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG); @@ -2166,6 +2167,36 @@ MipsTargetLowering::EmitAtomicCmpSwapPartword(MachineInstr *MI, //===----------------------------------------------------------------------===// // Misc Lower Operation implementation //===----------------------------------------------------------------------===// +SDValue MipsTargetLowering::LowerBR_JT(SDValue Op, SelectionDAG &DAG) const { + SDValue Chain = Op.getOperand(0); + SDValue Table = Op.getOperand(1); + SDValue Index = Op.getOperand(2); + DebugLoc DL = Op.getDebugLoc(); + EVT PTy = getPointerTy(); + unsigned EntrySize = + DAG.getMachineFunction().getJumpTableInfo()->getEntrySize(*getDataLayout()); + + Index = DAG.getNode(ISD::MUL, DL, PTy, Index, + DAG.getConstant(EntrySize, PTy)); + SDValue Addr = DAG.getNode(ISD::ADD, DL, PTy, Index, Table); + + EVT MemVT = EVT::getIntegerVT(*DAG.getContext(), EntrySize * 8); + Addr = DAG.getExtLoad(ISD::SEXTLOAD, DL, PTy, Chain, Addr, + MachinePointerInfo::getJumpTable(), MemVT, false, false, + 0); + Chain = Addr.getValue(1); + + if ((getTargetMachine().getRelocationModel() == Reloc::PIC_) || IsN64) { + // For PIC, the sequence is: + // BRIND(load(Jumptable + index) + RelocBase) + // RelocBase can be JumpTable, GOT or some sort of global base. + Addr = DAG.getNode(ISD::ADD, DL, PTy, Addr, + getPICJumpTableRelocBase(Table, DAG)); + } + + return DAG.getNode(ISD::BRIND, DL, MVT::Other, Chain, Addr); +} + SDValue MipsTargetLowering:: LowerBRCOND(SDValue Op, SelectionDAG &DAG) const { diff --git a/lib/Target/Mips/MipsISelLowering.h b/lib/Target/Mips/MipsISelLowering.h index 4424521..02d7e2f 100644 --- a/lib/Target/Mips/MipsISelLowering.h +++ b/lib/Target/Mips/MipsISelLowering.h @@ -292,6 +292,7 @@ namespace llvm { const SDNode *CallNode, const Type *RetTy) const; // Lower Operand specifics + SDValue LowerBR_JT(SDValue Op, SelectionDAG &DAG) const; SDValue LowerBRCOND(SDValue Op, SelectionDAG &DAG) const; SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const; SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const; |