ARMISelLowering.h revision f1ba1cad387dc52f3c2c5afc665edf9caad00992
1//===-- ARMISelLowering.h - ARM DAG Lowering Interface ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by Evan Cheng and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the interfaces that ARM uses to lower LLVM code into a 11// selection DAG. 12// 13//===----------------------------------------------------------------------===// 14 15#ifndef ARMISELLOWERING_H 16#define ARMISELLOWERING_H 17 18#include "ARMSubtarget.h" 19#include "llvm/Target/TargetLowering.h" 20#include "llvm/CodeGen/SelectionDAG.h" 21#include <vector> 22 23namespace llvm { 24 class ARMConstantPoolValue; 25 26 namespace ARMISD { 27 // ARM Specific DAG Nodes 28 enum NodeType { 29 // Start the numbering where the builting ops and target ops leave off. 30 FIRST_NUMBER = ISD::BUILTIN_OP_END+ARM::INSTRUCTION_LIST_END, 31 32 Wrapper, // Wrapper - A wrapper node for TargetConstantPool, 33 // TargetExternalSymbol, and TargetGlobalAddress. 34 WrapperJT, // WrapperJT - A wrapper node for TargetJumpTable 35 36 CALL, // Function call. 37 CALL_PRED, // Function call that's predicable. 38 CALL_NOLINK, // Function call with branch not branch-and-link. 39 tCALL, // Thumb function call. 40 BRCOND, // Conditional branch. 41 BR_JT, // Jumptable branch. 42 RET_FLAG, // Return with a flag operand. 43 44 PIC_ADD, // Add with a PC operand and a PIC label. 45 46 CMP, // ARM compare instructions. 47 CMPNZ, // ARM compare that uses only N or Z flags. 48 CMPFP, // ARM VFP compare instruction, sets FPSCR. 49 CMPFPw0, // ARM VFP compare against zero instruction, sets FPSCR. 50 FMSTAT, // ARM fmstat instruction. 51 CMOV, // ARM conditional move instructions. 52 CNEG, // ARM conditional negate instructions. 53 54 FTOSI, // FP to sint within a FP register. 55 FTOUI, // FP to uint within a FP register. 56 SITOF, // sint to FP within a FP register. 57 UITOF, // uint to FP within a FP register. 58 59 SRL_FLAG, // V,Flag = srl_flag X -> srl X, 1 + save carry out. 60 SRA_FLAG, // V,Flag = sra_flag X -> sra X, 1 + save carry out. 61 RRX, // V = RRX X, Flag -> srl X, 1 + shift in carry flag. 62 63 FMRRD, // double to two gprs. 64 FMDRR, // Two gprs to double. 65 66 THREAD_POINTER 67 }; 68 } 69 70 //===----------------------------------------------------------------------===// 71 // ARMTargetLowering - ARM Implementation of the TargetLowering interface 72 73 class ARMTargetLowering : public TargetLowering { 74 int VarArgsFrameIndex; // FrameIndex for start of varargs area. 75 public: 76 explicit ARMTargetLowering(TargetMachine &TM); 77 78 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG); 79 virtual const char *getTargetNodeName(unsigned Opcode) const; 80 81 virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI, 82 MachineBasicBlock *MBB); 83 84 /// isLegalAddressingMode - Return true if the addressing mode represented 85 /// by AM is legal for this target, for a load/store of the specified type. 86 virtual bool isLegalAddressingMode(const AddrMode &AM, const Type *Ty)const; 87 88 /// getPreIndexedAddressParts - returns true by value, base pointer and 89 /// offset pointer and addressing mode by reference if the node's address 90 /// can be legally represented as pre-indexed load / store address. 91 virtual bool getPreIndexedAddressParts(SDNode *N, SDOperand &Base, 92 SDOperand &Offset, 93 ISD::MemIndexedMode &AM, 94 SelectionDAG &DAG); 95 96 /// getPostIndexedAddressParts - returns true by value, base pointer and 97 /// offset pointer and addressing mode by reference if this node can be 98 /// combined with a load / store to form a post-indexed load / store. 99 virtual bool getPostIndexedAddressParts(SDNode *N, SDNode *Op, 100 SDOperand &Base, SDOperand &Offset, 101 ISD::MemIndexedMode &AM, 102 SelectionDAG &DAG); 103 104 virtual void computeMaskedBitsForTargetNode(const SDOperand Op, 105 uint64_t Mask, 106 uint64_t &KnownZero, 107 uint64_t &KnownOne, 108 const SelectionDAG &DAG, 109 unsigned Depth) const; 110 ConstraintType getConstraintType(const std::string &Constraint) const; 111 std::pair<unsigned, const TargetRegisterClass*> 112 getRegForInlineAsmConstraint(const std::string &Constraint, 113 MVT::ValueType VT) const; 114 std::vector<unsigned> 115 getRegClassForInlineAsmConstraint(const std::string &Constraint, 116 MVT::ValueType VT) const; 117 118 virtual const TargetSubtarget* getSubtarget() { 119 return static_cast<const TargetSubtarget*>(Subtarget); 120 } 121 122 private: 123 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can 124 /// make the right decision when generating code for different targets. 125 const ARMSubtarget *Subtarget; 126 127 /// ARMPCLabelIndex - Keep track the number of ARM PC labels created. 128 /// 129 unsigned ARMPCLabelIndex; 130 131 SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG); 132 SDOperand LowerGlobalAddressDarwin(SDOperand Op, SelectionDAG &DAG); 133 SDOperand LowerGlobalAddressELF(SDOperand Op, SelectionDAG &DAG); 134 SDOperand LowerGlobalTLSAddress(SDOperand Op, SelectionDAG &DAG); 135 SDOperand LowerToTLSGeneralDynamicModel(GlobalAddressSDNode *GA, 136 SelectionDAG &DAG); 137 SDOperand LowerToTLSExecModels(GlobalAddressSDNode *GA, 138 SelectionDAG &DAG); 139 SDOperand LowerGLOBAL_OFFSET_TABLE(SDOperand Op, SelectionDAG &DAG); 140 SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG); 141 SDOperand LowerBR_JT(SDOperand Op, SelectionDAG &DAG); 142 SDOperand LowerMEMCPYInline(SDOperand Chain, SDOperand Dest, 143 SDOperand Source, unsigned Size, 144 unsigned Align, SelectionDAG &DAG); 145 146 147 }; 148} 149 150#endif // ARMISELLOWERING_H 151