MipsInstrInfo.h revision 8589010e3d1d5a902992a5039cffa9d4116982c5 
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/Support/ErrorHandling.h"
21#include "llvm/Target/TargetInstrInfo.h"
22
23#define GET_INSTRINFO_HEADER
24#include "MipsGenInstrInfo.inc"
25
26namespace llvm {
27
28class MipsInstrInfo : public MipsGenInstrInfo {
29protected:
30  MipsTargetMachine &TM;
31  unsigned UncondBrOpc;
32
33public:
34  explicit MipsInstrInfo(MipsTargetMachine &TM, unsigned UncondBrOpc);
35
36  /// Branch Analysis
37  virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
38                             MachineBasicBlock *&FBB,
39                             SmallVectorImpl<MachineOperand> &Cond,
40                             bool AllowModify) const;
41
42  virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
43
44  virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
45                                MachineBasicBlock *FBB,
46                                const SmallVectorImpl<MachineOperand> &Cond,
47                                DebugLoc DL) const;
48
49  virtual
50  bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
51
52  virtual MachineInstr* emitFrameIndexDebugValue(MachineFunction &MF,
53                                                 int FrameIx, uint64_t Offset,
54                                                 const MDNode *MDPtr,
55                                                 DebugLoc DL) const;
56
57  /// Insert nop instruction when hazard condition is found
58  virtual void insertNoop(MachineBasicBlock &MBB,
59                          MachineBasicBlock::iterator MI) const;
60
61  /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
62  /// such, whenever a client has an instance of instruction info, it should
63  /// always be able to get register info as well (through this method).
64  ///
65  virtual const MipsRegisterInfo &getRegisterInfo() const = 0;
66
67  virtual unsigned GetOppositeBranchOpc(unsigned Opc) const = 0;
68
69  /// Return the number of bytes of code the specified instruction may be.
70  unsigned GetInstSizeInBytes(const MachineInstr *MI) const;
71
72protected:
73  bool isZeroImm(const MachineOperand &op) const;
74
75  MachineMemOperand *GetMemOperand(MachineBasicBlock &MBB, int FI,
76                                   unsigned Flag) const;
77
78private:
79  virtual unsigned GetAnalyzableBrOpc(unsigned Opc) const = 0;
80
81  void AnalyzeCondBr(const MachineInstr *Inst, unsigned Opc,
82                     MachineBasicBlock *&BB,
83                     SmallVectorImpl<MachineOperand> &Cond) const;
84
85  void BuildCondBr(MachineBasicBlock &MBB, MachineBasicBlock *TBB, DebugLoc DL,
86                   const SmallVectorImpl<MachineOperand>& Cond) const;
87};
88
89namespace Mips {
90  /// Emit a series of instructions to load an immediate. All instructions
91  /// except for the last one are emitted. The function returns the number of
92  /// MachineInstrs generated. The opcode-immediate pair of the last
93  /// instruction is returned in LastInst, if it is not 0.
94  unsigned
95  loadImmediate(int64_t Imm, bool IsN64, const TargetInstrInfo &TII,
96                MachineBasicBlock& MBB, MachineBasicBlock::iterator II,
97                DebugLoc DL, bool LastInstrIsADDiu,
98                MipsAnalyzeImmediate::Inst *LastInst);
99}
100
101}
102
103#endif
104