MSP430ISelLowering.h revision 69d5b48bc31b7a443355cdf1506005804b4f63e6
1//==-- MSP430ISelLowering.h - MSP430 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 MSP430 uses to lower LLVM code into a 11// selection DAG. 12// 13//===----------------------------------------------------------------------===// 14 15#ifndef LLVM_TARGET_MSP430_ISELLOWERING_H 16#define LLVM_TARGET_MSP430_ISELLOWERING_H 17 18#include "MSP430.h" 19#include "llvm/CodeGen/SelectionDAG.h" 20#include "llvm/Target/TargetLowering.h" 21 22namespace llvm { 23 namespace MSP430ISD { 24 enum { 25 FIRST_NUMBER = ISD::BUILTIN_OP_END, 26 27 /// Return with a flag operand. Operand 0 is the chain operand. 28 RET_FLAG, 29 30 /// Same as RET_FLAG, but used for returning from ISRs. 31 RETI_FLAG, 32 33 /// Y = R{R,L}A X, rotate right (left) arithmetically 34 RRA, RLA, 35 36 /// Y = RRC X, rotate right via carry 37 RRC, 38 39 /// CALL - These operations represent an abstract call 40 /// instruction, which includes a bunch of information. 41 CALL, 42 43 /// Wrapper - A wrapper node for TargetConstantPool, TargetExternalSymbol, 44 /// and TargetGlobalAddress. 45 Wrapper, 46 47 /// CMP - Compare instruction. 48 CMP, 49 50 /// SetCC - Operand 0 is condition code, and operand 1 is the flag 51 /// operand produced by a CMP instruction. 52 SETCC, 53 54 /// MSP430 conditional branches. Operand 0 is the chain operand, operand 1 55 /// is the block to branch if condition is true, operand 2 is the 56 /// condition code, and operand 3 is the flag operand produced by a CMP 57 /// instruction. 58 BR_CC, 59 60 /// SELECT_CC - Operand 0 and operand 1 are selection variable, operand 3 61 /// is condition code and operand 4 is flag operand. 62 SELECT_CC, 63 64 /// SHL, SRA, SRL - Non-constant shifts. 65 SHL, SRA, SRL 66 }; 67 } 68 69 class MSP430Subtarget; 70 class MSP430TargetMachine; 71 72 class MSP430TargetLowering : public TargetLowering { 73 public: 74 explicit MSP430TargetLowering(MSP430TargetMachine &TM); 75 76 /// LowerOperation - Provide custom lowering hooks for some operations. 77 virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const; 78 79 /// getTargetNodeName - This method returns the name of a target specific 80 /// DAG node. 81 virtual const char *getTargetNodeName(unsigned Opcode) const; 82 83 /// getFunctionAlignment - Return the Log2 alignment of this function. 84 virtual unsigned getFunctionAlignment(const Function *F) const; 85 86 SDValue LowerShifts(SDValue Op, SelectionDAG &DAG) const; 87 SDValue LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const; 88 SDValue LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const; 89 SDValue LowerExternalSymbol(SDValue Op, SelectionDAG &DAG) const; 90 SDValue LowerBR_CC(SDValue Op, SelectionDAG &DAG) const; 91 SDValue LowerSETCC(SDValue Op, SelectionDAG &DAG) const; 92 SDValue LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const; 93 SDValue LowerSIGN_EXTEND(SDValue Op, SelectionDAG &DAG) const; 94 SDValue LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const; 95 SDValue LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const; 96 SDValue getReturnAddressFrameIndex(SelectionDAG &DAG) const; 97 98 TargetLowering::ConstraintType 99 getConstraintType(const std::string &Constraint) const; 100 std::pair<unsigned, const TargetRegisterClass*> 101 getRegForInlineAsmConstraint(const std::string &Constraint, EVT VT) const; 102 103 /// isTruncateFree - Return true if it's free to truncate a value of type 104 /// Ty1 to type Ty2. e.g. On msp430 it's free to truncate a i16 value in 105 /// register R15W to i8 by referencing its sub-register R15B. 106 virtual bool isTruncateFree(const Type *Ty1, const Type *Ty2) const; 107 virtual bool isTruncateFree(EVT VT1, EVT VT2) const; 108 109 /// isZExtFree - Return true if any actual instruction that defines a value 110 /// of type Ty1 implicit zero-extends the value to Ty2 in the result 111 /// register. This does not necessarily include registers defined in unknown 112 /// ways, such as incoming arguments, or copies from unknown virtual 113 /// registers. Also, if isTruncateFree(Ty2, Ty1) is true, this does not 114 /// necessarily apply to truncate instructions. e.g. on msp430, all 115 /// instructions that define 8-bit values implicit zero-extend the result 116 /// out to 16 bits. 117 virtual bool isZExtFree(const Type *Ty1, const Type *Ty2) const; 118 virtual bool isZExtFree(EVT VT1, EVT VT2) const; 119 120 MachineBasicBlock* EmitInstrWithCustomInserter(MachineInstr *MI, 121 MachineBasicBlock *BB) const; 122 MachineBasicBlock* EmitShiftInstr(MachineInstr *MI, 123 MachineBasicBlock *BB) const; 124 125 private: 126 SDValue LowerCCCCallTo(SDValue Chain, SDValue Callee, 127 CallingConv::ID CallConv, bool isVarArg, 128 bool isTailCall, 129 const SmallVectorImpl<ISD::OutputArg> &Outs, 130 const SmallVectorImpl<ISD::InputArg> &Ins, 131 DebugLoc dl, SelectionDAG &DAG, 132 SmallVectorImpl<SDValue> &InVals) const; 133 134 SDValue LowerCCCArguments(SDValue Chain, 135 CallingConv::ID CallConv, 136 bool isVarArg, 137 const SmallVectorImpl<ISD::InputArg> &Ins, 138 DebugLoc dl, 139 SelectionDAG &DAG, 140 SmallVectorImpl<SDValue> &InVals) const; 141 142 SDValue LowerCallResult(SDValue Chain, SDValue InFlag, 143 CallingConv::ID CallConv, bool isVarArg, 144 const SmallVectorImpl<ISD::InputArg> &Ins, 145 DebugLoc dl, SelectionDAG &DAG, 146 SmallVectorImpl<SDValue> &InVals) const; 147 148 virtual SDValue 149 LowerFormalArguments(SDValue Chain, 150 CallingConv::ID CallConv, bool isVarArg, 151 const SmallVectorImpl<ISD::InputArg> &Ins, 152 DebugLoc dl, SelectionDAG &DAG, 153 SmallVectorImpl<SDValue> &InVals) const; 154 virtual SDValue 155 LowerCall(SDValue Chain, SDValue Callee, 156 CallingConv::ID CallConv, bool isVarArg, bool &isTailCall, 157 const SmallVectorImpl<ISD::OutputArg> &Outs, 158 const SmallVectorImpl<ISD::InputArg> &Ins, 159 DebugLoc dl, SelectionDAG &DAG, 160 SmallVectorImpl<SDValue> &InVals) const; 161 162 virtual SDValue 163 LowerReturn(SDValue Chain, 164 CallingConv::ID CallConv, bool isVarArg, 165 const SmallVectorImpl<ISD::OutputArg> &Outs, 166 DebugLoc dl, SelectionDAG &DAG) const; 167 168 virtual bool getPostIndexedAddressParts(SDNode *N, SDNode *Op, 169 SDValue &Base, 170 SDValue &Offset, 171 ISD::MemIndexedMode &AM, 172 SelectionDAG &DAG) const; 173 174 const MSP430Subtarget &Subtarget; 175 const MSP430TargetMachine &TM; 176 const TargetData *TD; 177 }; 178} // namespace llvm 179 180#endif // LLVM_TARGET_MSP430_ISELLOWERING_H 181