1 //===-- MBlazeISelLowering.h - MBlaze DAG Lowering Interface ----*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines the interfaces that MBlaze uses to lower LLVM code into a 11 // selection DAG. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef MBlazeISELLOWERING_H 16 #define MBlazeISELLOWERING_H 17 18 #include "MBlaze.h" 19 #include "MBlazeSubtarget.h" 20 #include "llvm/CodeGen/SelectionDAG.h" 21 #include "llvm/Support/ErrorHandling.h" 22 #include "llvm/Target/TargetLowering.h" 23 24 namespace llvm { 25 namespace MBlazeCC { 26 enum CC { 27 FIRST = 0, 28 EQ, 29 NE, 30 GT, 31 LT, 32 GE, 33 LE 34 }; 35 36 inline static CC getOppositeCondition(CC cc) { 37 switch (cc) { 38 default: llvm_unreachable("Unknown condition code"); 39 case EQ: return NE; 40 case NE: return EQ; 41 case GT: return LE; 42 case LT: return GE; 43 case GE: return LT; 44 case LE: return GE; 45 } 46 } 47 48 inline static const char *MBlazeCCToString(CC cc) { 49 switch (cc) { 50 default: llvm_unreachable("Unknown condition code"); 51 case EQ: return "eq"; 52 case NE: return "ne"; 53 case GT: return "gt"; 54 case LT: return "lt"; 55 case GE: return "ge"; 56 case LE: return "le"; 57 } 58 } 59 } 60 61 namespace MBlazeISD { 62 enum NodeType { 63 // Start the numbering from where ISD NodeType finishes. 64 FIRST_NUMBER = ISD::BUILTIN_OP_END, 65 66 // Jump and link (call) 67 JmpLink, 68 69 // Handle gp_rel (small data/bss sections) relocation. 70 GPRel, 71 72 // Select CC Pseudo Instruction 73 Select_CC, 74 75 // Wrap up multiple types of instructions 76 Wrap, 77 78 // Integer Compare 79 ICmp, 80 81 // Return from subroutine 82 Ret, 83 84 // Return from interrupt 85 IRet 86 }; 87 } 88 89 //===--------------------------------------------------------------------===// 90 // TargetLowering Implementation 91 //===--------------------------------------------------------------------===// 92 93 class MBlazeTargetLowering : public TargetLowering { 94 public: 95 explicit MBlazeTargetLowering(MBlazeTargetMachine &TM); 96 97 /// LowerOperation - Provide custom lowering hooks for some operations. 98 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const; 99 100 /// getTargetNodeName - This method returns the name of a target specific 101 // DAG node. 102 virtual const char *getTargetNodeName(unsigned Opcode) const; 103 104 /// getSetCCResultType - get the ISD::SETCC result ValueType 105 EVT getSetCCResultType(EVT VT) const; 106 107 private: 108 // Subtarget Info 109 const MBlazeSubtarget *Subtarget; 110 111 112 // Lower Operand helpers 113 SDValue LowerCallResult(SDValue Chain, SDValue InFlag, 114 CallingConv::ID CallConv, bool isVarArg, 115 const SmallVectorImpl<ISD::InputArg> &Ins, 116 DebugLoc dl, SelectionDAG &DAG, 117 SmallVectorImpl<SDValue> &InVals) const; 118 119 // Lower Operand specifics 120 SDValue LowerConstantPool(SDValue Op, SelectionDAG &DAG) const; 121 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const; 122 SDValue LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const; 123 SDValue LowerJumpTable(SDValue Op, SelectionDAG &DAG) const; 124 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const; 125 SDValue LowerVASTART(SDValue Op, SelectionDAG &DAG) const; 126 127 virtual SDValue 128 LowerFormalArguments(SDValue Chain, 129 CallingConv::ID CallConv, bool isVarArg, 130 const SmallVectorImpl<ISD::InputArg> &Ins, 131 DebugLoc dl, SelectionDAG &DAG, 132 SmallVectorImpl<SDValue> &InVals) const; 133 134 virtual SDValue 135 LowerCall(TargetLowering::CallLoweringInfo &CLI, 136 SmallVectorImpl<SDValue> &InVals) const; 137 138 virtual SDValue 139 LowerReturn(SDValue Chain, 140 CallingConv::ID CallConv, bool isVarArg, 141 const SmallVectorImpl<ISD::OutputArg> &Outs, 142 const SmallVectorImpl<SDValue> &OutVals, 143 DebugLoc dl, SelectionDAG &DAG) const; 144 145 virtual MachineBasicBlock* 146 EmitCustomShift(MachineInstr *MI, MachineBasicBlock *MBB) const; 147 148 virtual MachineBasicBlock* 149 EmitCustomSelect(MachineInstr *MI, MachineBasicBlock *MBB) const; 150 151 virtual MachineBasicBlock* 152 EmitCustomAtomic(MachineInstr *MI, MachineBasicBlock *MBB) const; 153 154 virtual MachineBasicBlock * 155 EmitInstrWithCustomInserter(MachineInstr *MI, 156 MachineBasicBlock *MBB) const; 157 158 // Inline asm support 159 ConstraintType getConstraintType(const std::string &Constraint) const; 160 161 /// Examine constraint string and operand type and determine a weight value. 162 /// The operand object must already have been set up with the operand type. 163 ConstraintWeight getSingleConstraintMatchWeight( 164 AsmOperandInfo &info, const char *constraint) const; 165 166 std::pair<unsigned, const TargetRegisterClass*> 167 getRegForInlineAsmConstraint(const std::string &Constraint, 168 EVT VT) const; 169 170 virtual bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const; 171 172 /// isFPImmLegal - Returns true if the target can instruction select the 173 /// specified FP immediate natively. If false, the legalizer will 174 /// materialize the FP immediate as a load from a constant pool. 175 virtual bool isFPImmLegal(const APFloat &Imm, EVT VT) const; 176 }; 177 } 178 179 #endif // MBlazeISELLOWERING_H 180
