ARMISelLowering.h revision c60e76d139a96cc8bb7454929172cdb992e16971
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 "llvm/Target/TargetLowering.h" 19#include "llvm/CodeGen/SelectionDAG.h" 20#include <vector> 21 22namespace llvm { 23 class ARMConstantPoolValue; 24 class ARMSubtarget; 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_NOLINK, // Function call with branch not branch-and-link. 38 tCALL, // Thumb function call. 39 BRCOND, // Conditional branch. 40 BR_JT, // Jumptable branch. 41 RET_FLAG, // Return with a flag operand. 42 43 PIC_ADD, // Add with a PC operand and a PIC label. 44 45 CMP, // ARM compare instructions. 46 CMPFP, // ARM VFP compare instruction, sets FPSCR. 47 CMPFPw0, // ARM VFP compare against zero instruction, sets FPSCR. 48 FMSTAT, // ARM fmstat instruction. 49 CMOV, // ARM conditional move instructions. 50 CNEG, // ARM conditional negate instructions. 51 52 FTOSI, // FP to sint within a FP register. 53 FTOUI, // FP to uint within a FP register. 54 SITOF, // sint to FP within a FP register. 55 UITOF, // uint to FP within a FP register. 56 57 MULHILOU, // Lo,Hi = umul LHS, RHS. 58 MULHILOS, // Lo,Hi = smul LHS, RHS. 59 60 SRL_FLAG, // V,Flag = srl_flag X -> srl X, 1 + save carry out. 61 SRA_FLAG, // V,Flag = sra_flag X -> sra X, 1 + save carry out. 62 RRX, // V = RRX X, Flag -> srl X, 1 + shift in carry flag. 63 64 FMRRD, // double to two gprs. 65 FMDRR // Two gprs to double. 66 }; 67 } 68 69 //===----------------------------------------------------------------------===// 70 // ARMTargetLowering - X86 Implementation of the TargetLowering interface 71 72 class ARMTargetLowering : public TargetLowering { 73 int VarArgsFrameIndex; // FrameIndex for start of varargs area. 74 public: 75 ARMTargetLowering(TargetMachine &TM); 76 77 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG); 78 virtual const char *getTargetNodeName(unsigned Opcode) const; 79 80 virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI, 81 MachineBasicBlock *MBB); 82 83 /// isLegalAddressImmediate - Return true if the integer value or 84 /// GlobalValue can be used as the offset of the target addressing mode. 85 virtual bool isLegalAddressImmediate(int64_t V) const; 86 virtual bool isLegalAddressImmediate(GlobalValue *GV) 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 unsigned Depth) const; 109 ConstraintType getConstraintType(char ConstraintLetter) const; 110 std::pair<unsigned, const TargetRegisterClass*> 111 getRegForInlineAsmConstraint(const std::string &Constraint, 112 MVT::ValueType VT) const; 113 std::vector<unsigned> 114 getRegClassForInlineAsmConstraint(const std::string &Constraint, 115 MVT::ValueType VT) const; 116 private: 117 /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can 118 /// make the right decision when generating code for different targets. 119 const ARMSubtarget *Subtarget; 120 121 /// ARMPCLabelIndex - Keep track the number of ARM PC labels created. 122 /// 123 unsigned ARMPCLabelIndex; 124 125 SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG); 126 SDOperand LowerGlobalAddress(SDOperand Op, SelectionDAG &DAG); 127 SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG); 128 SDOperand LowerBR_JT(SDOperand Op, SelectionDAG &DAG); 129 }; 130} 131 132#endif // ARMISELLOWERING_H 133