PTX: Add basic register spilling code
[oota-llvm.git] / lib / Target / PTX / PTXInstrInfo.h
1 //===- PTXInstrInfo.h - PTX 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 PTX implementation of the TargetInstrInfo class.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #ifndef PTX_INSTR_INFO_H
15 #define PTX_INSTR_INFO_H
16
17 #include "PTXRegisterInfo.h"
18 #include "llvm/Target/TargetInstrInfo.h"
19
20 namespace llvm {
21 class PTXTargetMachine;
22
23 class MachineSDNode;
24 class SDValue;
25 class SelectionDAG;
26
27 class PTXInstrInfo : public TargetInstrInfoImpl {
28 private:
29   const PTXRegisterInfo RI;
30   PTXTargetMachine &TM;
31
32 public:
33   explicit PTXInstrInfo(PTXTargetMachine &_TM);
34
35   virtual const PTXRegisterInfo &getRegisterInfo() const { return RI; }
36
37   virtual void copyPhysReg(MachineBasicBlock &MBB,
38                            MachineBasicBlock::iterator I, DebugLoc DL,
39                            unsigned DstReg, unsigned SrcReg,
40                            bool KillSrc) const;
41
42   virtual bool copyRegToReg(MachineBasicBlock &MBB,
43                             MachineBasicBlock::iterator I,
44                             unsigned DstReg, unsigned SrcReg,
45                             const TargetRegisterClass *DstRC,
46                             const TargetRegisterClass *SrcRC,
47                             DebugLoc DL) const;
48
49   virtual bool isMoveInstr(const MachineInstr& MI,
50                            unsigned &SrcReg, unsigned &DstReg,
51                            unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
52
53   // predicate support
54
55   virtual bool isPredicated(const MachineInstr *MI) const;
56
57   virtual bool isUnpredicatedTerminator(const MachineInstr *MI) const;
58
59   virtual
60   bool PredicateInstruction(MachineInstr *MI,
61                             const SmallVectorImpl<MachineOperand> &Pred) const;
62
63   virtual
64   bool SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
65                          const SmallVectorImpl<MachineOperand> &Pred2) const;
66
67   virtual bool DefinesPredicate(MachineInstr *MI,
68                                 std::vector<MachineOperand> &Pred) const;
69
70   // PTX is fully-predicable
71   virtual bool isPredicable(MachineInstr *MI) const { return true; }
72
73   // branch support
74
75   virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
76                              MachineBasicBlock *&FBB,
77                              SmallVectorImpl<MachineOperand> &Cond,
78                              bool AllowModify = false) const;
79
80   virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
81
82   virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
83                                 MachineBasicBlock *FBB,
84                                 const SmallVectorImpl<MachineOperand> &Cond,
85                                 DebugLoc DL) const;
86
87   // Memory operand folding for spills
88   // TODO: Implement this eventually and get rid of storeRegToStackSlot and
89   //       loadRegFromStackSlot.  Doing so will get rid of the "stack" registers
90   //       we currently use to spill, though I doubt the overall effect on ptxas
91   //       output will be large.  I have yet to see a case where ptxas is unable
92   //       to see through the "stack" register usage and hence generates
93   //       efficient code anyway.
94   // virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
95   //                                             MachineInstr* MI,
96   //                                          const SmallVectorImpl<unsigned> &Ops,
97   //                                             int FrameIndex) const;
98
99   virtual void storeRegToStackSlot(MachineBasicBlock& MBB,
100                                    MachineBasicBlock::iterator MII,
101                                    unsigned SrcReg, bool isKill, int FrameIndex,
102                                    const TargetRegisterClass* RC,
103                                    const TargetRegisterInfo* TRI) const;
104   virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
105                                     MachineBasicBlock::iterator MII,
106                                     unsigned DestReg, int FrameIdx,
107                                     const TargetRegisterClass *RC,
108                                     const TargetRegisterInfo *TRI) const;
109
110   // static helper routines
111
112   static MachineSDNode *GetPTXMachineNode(SelectionDAG *DAG, unsigned Opcode,
113                                           DebugLoc dl, EVT VT,
114                                           SDValue Op1);
115
116   static MachineSDNode *GetPTXMachineNode(SelectionDAG *DAG, unsigned Opcode,
117                                           DebugLoc dl, EVT VT,
118                                           SDValue Op1, SDValue Op2);
119
120   static void AddDefaultPredicate(MachineInstr *MI);
121
122   static bool IsAnyKindOfBranch(const MachineInstr& inst);
123
124   static bool IsAnySuccessorAlsoLayoutSuccessor(const MachineBasicBlock& MBB);
125
126   static MachineBasicBlock *GetBranchTarget(const MachineInstr& inst);
127 }; // class PTXInstrInfo
128 } // namespace llvm
129
130 #endif // PTX_INSTR_INFO_H