diff options
Diffstat (limited to 'lib/Target/XCore/XCoreISelLowering.cpp')
| -rw-r--r-- | lib/Target/XCore/XCoreISelLowering.cpp | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/lib/Target/XCore/XCoreISelLowering.cpp b/lib/Target/XCore/XCoreISelLowering.cpp index 57fd43b16b..667476cb25 100644 --- a/lib/Target/XCore/XCoreISelLowering.cpp +++ b/lib/Target/XCore/XCoreISelLowering.cpp @@ -29,6 +29,7 @@ #include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineInstrBuilder.h" +#include "llvm/CodeGen/MachineJumpTableInfo.h" #include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/CodeGen/SelectionDAGISel.h" #include "llvm/CodeGen/ValueTypes.h" @@ -53,6 +54,8 @@ getTargetNodeName(unsigned Opcode) const case XCoreISD::RETSP : return "XCoreISD::RETSP"; case XCoreISD::LADD : return "XCoreISD::LADD"; case XCoreISD::LSUB : return "XCoreISD::LSUB"; + case XCoreISD::BR_JT : return "XCoreISD::BR_JT"; + case XCoreISD::BR_JT32 : return "XCoreISD::BR_JT32"; default : return NULL; } } @@ -106,9 +109,8 @@ XCoreTargetLowering::XCoreTargetLowering(XCoreTargetMachine &XTM) setOperationAction(ISD::TRAP, MVT::Other, Legal); - // Expand jump tables for now - setOperationAction(ISD::BR_JT, MVT::Other, Expand); - setOperationAction(ISD::JumpTable, MVT::i32, Custom); + // Jump tables. + setOperationAction(ISD::BR_JT, MVT::Other, Custom); setOperationAction(ISD::GlobalAddress, MVT::i32, Custom); setOperationAction(ISD::BlockAddress, MVT::i32 , Custom); @@ -158,6 +160,7 @@ LowerOperation(SDValue Op, SelectionDAG &DAG) { case ISD::BlockAddress: return LowerBlockAddress(Op, DAG); case ISD::ConstantPool: return LowerConstantPool(Op, DAG); case ISD::JumpTable: return LowerJumpTable(Op, DAG); + case ISD::BR_JT: return LowerBR_JT(Op, DAG); case ISD::LOAD: return LowerLOAD(Op, DAG); case ISD::STORE: return LowerSTORE(Op, DAG); case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG); @@ -325,6 +328,30 @@ LowerJumpTable(SDValue Op, SelectionDAG &DAG) return DAG.getNode(XCoreISD::DPRelativeWrapper, dl, MVT::i32, JTI); } +SDValue XCoreTargetLowering:: +LowerBR_JT(SDValue Op, SelectionDAG &DAG) +{ + SDValue Chain = Op.getOperand(0); + SDValue Table = Op.getOperand(1); + SDValue Index = Op.getOperand(2); + DebugLoc dl = Op.getDebugLoc(); + JumpTableSDNode *JT = cast<JumpTableSDNode>(Table); + unsigned JTI = JT->getIndex(); + MachineFunction &MF = DAG.getMachineFunction(); + const MachineJumpTableInfo *MJTI = MF.getJumpTableInfo(); + SDValue TargetJT = DAG.getTargetJumpTable(JT->getIndex(), MVT::i32); + + unsigned NumEntries = MJTI->getJumpTables()[JTI].MBBs.size(); + if (NumEntries <= 32) { + return DAG.getNode(XCoreISD::BR_JT, dl, MVT::Other, Chain, TargetJT, Index); + } + assert((NumEntries >> 31) == 0); + SDValue ScaledIndex = DAG.getNode(ISD::SHL, dl, MVT::i32, Index, + DAG.getConstant(1, MVT::i32)); + return DAG.getNode(XCoreISD::BR_JT32, dl, MVT::Other, Chain, TargetJT, + ScaledIndex); +} + static bool IsWordAlignedBasePlusConstantOffset(SDValue Addr, SDValue &AlignedBase, int64_t &Offset) |