MipsInstrInfo.h revision b21ab43cfc3fa0dacf5c95f04e58b6d804b59a16 
1//===-- MipsInstrInfo.h - Mips Instruction Information ----------*- 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 contains the Mips implementation of the TargetInstrInfo class.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef MIPSINSTRUCTIONINFO_H
15#define MIPSINSTRUCTIONINFO_H
16
17#include "Mips.h"
18#include "MipsAnalyzeImmediate.h"
19#include "MipsRegisterInfo.h"
20#include "llvm/CodeGen/MachineInstrBuilder.h"
21#include "llvm/Support/ErrorHandling.h"
22#include "llvm/Target/TargetInstrInfo.h"
23
24#define GET_INSTRINFO_HEADER
25#include "MipsGenInstrInfo.inc"
26
27namespace llvm {
28
29class MipsInstrInfo : public MipsGenInstrInfo {
30protected:
31  MipsTargetMachine &TM;
32  unsigned UncondBrOpc;
33
34public:
35  enum BranchType {
36    BT_None,       // Couldn't analyze branch.
37    BT_NoBranch,   // No branches found.
38    BT_Uncond,     // One unconditional branch.
39    BT_Cond,       // One conditional branch.
40    BT_CondUncond, // A conditional branch followed by an unconditional branch.
41    BT_Indirect    // One indirct branch.
42  };
43
44  explicit MipsInstrInfo(MipsTargetMachine &TM, unsigned UncondBrOpc);
45
46  static const MipsInstrInfo *create(MipsTargetMachine &TM);
47
48  /// Branch Analysis
49  virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
50                             MachineBasicBlock *&FBB,
51                             SmallVectorImpl<MachineOperand> &Cond,
52                             bool AllowModify) const;
53
54  virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
55
56  virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
57                                MachineBasicBlock *FBB,
58                                const SmallVectorImpl<MachineOperand> &Cond,
59                                DebugLoc DL) const;
60
61  virtual
62  bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
63
64  BranchType AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
65                           MachineBasicBlock *&FBB,
66                           SmallVectorImpl<MachineOperand> &Cond,
67                           bool AllowModify,
68                           SmallVectorImpl<MachineInstr*> &BranchInstrs) const;
69
70  /// Insert nop instruction when hazard condition is found
71  virtual void insertNoop(MachineBasicBlock &MBB,
72                          MachineBasicBlock::iterator MI) const;
73
74  /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
75  /// such, whenever a client has an instance of instruction info, it should
76  /// always be able to get register info as well (through this method).
77  ///
78  virtual const MipsRegisterInfo &getRegisterInfo() const = 0;
79
80  virtual unsigned getOppositeBranchOpc(unsigned Opc) const = 0;
81
82  /// Return the number of bytes of code the specified instruction may be.
83  unsigned GetInstSizeInBytes(const MachineInstr *MI) const;
84
85  virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
86                                   MachineBasicBlock::iterator MBBI,
87                                   unsigned SrcReg, bool isKill, int FrameIndex,
88                                   const TargetRegisterClass *RC,
89                                   const TargetRegisterInfo *TRI) const {
90    storeRegToStack(MBB, MBBI, SrcReg, isKill, FrameIndex, RC, TRI, 0);
91  }
92
93  virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
94                                    MachineBasicBlock::iterator MBBI,
95                                    unsigned DestReg, int FrameIndex,
96                                    const TargetRegisterClass *RC,
97                                    const TargetRegisterInfo *TRI) const {
98    loadRegFromStack(MBB, MBBI, DestReg, FrameIndex, RC, TRI, 0);
99  }
100
101  virtual void storeRegToStack(MachineBasicBlock &MBB,
102                               MachineBasicBlock::iterator MI,
103                               unsigned SrcReg, bool isKill, int FrameIndex,
104                               const TargetRegisterClass *RC,
105                               const TargetRegisterInfo *TRI,
106                               int64_t Offset) const = 0;
107
108  virtual void loadRegFromStack(MachineBasicBlock &MBB,
109                                MachineBasicBlock::iterator MI,
110                                unsigned DestReg, int FrameIndex,
111                                const TargetRegisterClass *RC,
112                                const TargetRegisterInfo *TRI,
113                                int64_t Offset) const = 0;
114
115  /// Create an instruction which has the same operands and memory operands
116  /// as MI but has a new opcode.
117  MachineInstrBuilder genInstrWithNewOpc(unsigned NewOpc,
118                                         MachineBasicBlock::iterator I) const;
119
120protected:
121  bool isZeroImm(const MachineOperand &op) const;
122
123  MachineMemOperand *GetMemOperand(MachineBasicBlock &MBB, int FI,
124                                   unsigned Flag) const;
125
126private:
127  virtual unsigned getAnalyzableBrOpc(unsigned Opc) const = 0;
128
129  void AnalyzeCondBr(const MachineInstr *Inst, unsigned Opc,
130                     MachineBasicBlock *&BB,
131                     SmallVectorImpl<MachineOperand> &Cond) const;
132
133  void BuildCondBr(MachineBasicBlock &MBB, MachineBasicBlock *TBB, DebugLoc DL,
134                   const SmallVectorImpl<MachineOperand>& Cond) const;
135};
136
137/// Create MipsInstrInfo objects.
138const MipsInstrInfo *createMips16InstrInfo(MipsTargetMachine &TM);
139const MipsInstrInfo *createMipsSEInstrInfo(MipsTargetMachine &TM);
140
141}
142
143#endif
144