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1 //===- AArch64InstrInfo.h - AArch64 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 AArch64 implementation of the TargetInstrInfo class.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #ifndef LLVM_TARGET_AARCH64INSTRINFO_H
15 #define LLVM_TARGET_AARCH64INSTRINFO_H
16
17 #include "llvm/Target/TargetInstrInfo.h"
18 #include "AArch64RegisterInfo.h"
19
20 #define GET_INSTRINFO_HEADER
21 #include "AArch64GenInstrInfo.inc"
22
23 namespace llvm {
24
25 class AArch64Subtarget;
26
27 class AArch64InstrInfo : public AArch64GenInstrInfo {
28   const AArch64RegisterInfo RI;
29   const AArch64Subtarget &Subtarget;
30 public:
31   explicit AArch64InstrInfo(const AArch64Subtarget &TM);
32
33   /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
34   /// such, whenever a client has an instance of instruction info, it should
35   /// always be able to get register info as well (through this method).
36   ///
37   const TargetRegisterInfo &getRegisterInfo() const { return RI; }
38
39   const AArch64Subtarget &getSubTarget() const { return Subtarget; }
40
41   void copyPhysReg(MachineBasicBlock &MBB,
42                    MachineBasicBlock::iterator I, DebugLoc DL,
43                    unsigned DestReg, unsigned SrcReg,
44                    bool KillSrc) const;
45
46   void storeRegToStackSlot(MachineBasicBlock &MBB,
47                            MachineBasicBlock::iterator MI,
48                            unsigned SrcReg, bool isKill, int FrameIndex,
49                            const TargetRegisterClass *RC,
50                            const TargetRegisterInfo *TRI) const;
51   void loadRegFromStackSlot(MachineBasicBlock &MBB,
52                             MachineBasicBlock::iterator MBBI,
53                             unsigned DestReg, int FrameIdx,
54                             const TargetRegisterClass *RC,
55                             const TargetRegisterInfo *TRI) const;
56
57   bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
58                      MachineBasicBlock *&FBB,
59                      SmallVectorImpl<MachineOperand> &Cond,
60                      bool AllowModify = false) const;
61   unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
62                         MachineBasicBlock *FBB,
63                         const SmallVectorImpl<MachineOperand> &Cond,
64                         DebugLoc DL) const;
65   unsigned RemoveBranch(MachineBasicBlock &MBB) const;
66   bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
67
68   bool expandPostRAPseudo(MachineBasicBlock::iterator MI) const;
69
70   /// Look through the instructions in this function and work out the largest
71   /// the stack frame can be while maintaining the ability to address local
72   /// slots with no complexities.
73   unsigned estimateRSStackLimit(MachineFunction &MF) const;
74
75   /// getAddressConstraints - For loads and stores (and PRFMs) taking an
76   /// immediate offset, this function determines the constraints required for
77   /// the immediate. It must satisfy:
78   ///    + MinOffset <= imm <= MaxOffset
79   ///    + imm % OffsetScale == 0
80   void getAddressConstraints(const MachineInstr &MI, int &AccessScale,
81                              int &MinOffset, int &MaxOffset) const;
82
83
84   unsigned getInstSizeInBytes(const MachineInstr &MI) const;
85
86   unsigned getInstBundleLength(const MachineInstr &MI) const;
87
88 };
89
90 bool rewriteA64FrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
91                           unsigned FrameReg, int &Offset,
92                           const AArch64InstrInfo &TII);
93
94
95 void emitRegUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
96                    DebugLoc dl, const TargetInstrInfo &TII,
97                    unsigned DstReg, unsigned SrcReg, unsigned ScratchReg,
98                    int64_t NumBytes,
99                    MachineInstr::MIFlag MIFlags = MachineInstr::NoFlags);
100
101 void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
102                   DebugLoc dl, const TargetInstrInfo &TII,
103                   unsigned ScratchReg, int64_t NumBytes,
104                   MachineInstr::MIFlag MIFlags = MachineInstr::NoFlags);
105
106 }
107
108 #endif