LLVM  3.7.0
MipsISelDAGToDAG.h
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1 //===---- MipsISelDAGToDAG.h - A Dag to Dag Inst Selector for Mips --------===//
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 defines an instruction selector for the MIPS target.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_LIB_TARGET_MIPS_MIPSISELDAGTODAG_H
15 #define LLVM_LIB_TARGET_MIPS_MIPSISELDAGTODAG_H
16 
17 #include "Mips.h"
18 #include "MipsSubtarget.h"
19 #include "MipsTargetMachine.h"
21 
22 //===----------------------------------------------------------------------===//
23 // Instruction Selector Implementation
24 //===----------------------------------------------------------------------===//
25 
26 //===----------------------------------------------------------------------===//
27 // MipsDAGToDAGISel - MIPS specific code to select MIPS machine
28 // instructions for SelectionDAG operations.
29 //===----------------------------------------------------------------------===//
30 namespace llvm {
31 
33 public:
35  : SelectionDAGISel(TM), Subtarget(nullptr) {}
36 
37  // Pass Name
38  const char *getPassName() const override {
39  return "MIPS DAG->DAG Pattern Instruction Selection";
40  }
41 
42  bool runOnMachineFunction(MachineFunction &MF) override;
43 
44 protected:
46 
47  /// Keep a pointer to the MipsSubtarget around so that we can make the right
48  /// decision when generating code for different targets.
50 
51 private:
52  // Include the pieces autogenerated from the target description.
53  #include "MipsGenDAGISel.inc"
54 
55  // Complex Pattern.
56  /// (reg + imm).
57  virtual bool selectAddrRegImm(SDValue Addr, SDValue &Base,
58  SDValue &Offset) const;
59 
60  // Complex Pattern.
61  /// (reg + reg).
62  virtual bool selectAddrRegReg(SDValue Addr, SDValue &Base,
63  SDValue &Offset) const;
64 
65  /// Fall back on this function if all else fails.
66  virtual bool selectAddrDefault(SDValue Addr, SDValue &Base,
67  SDValue &Offset) const;
68 
69  /// Match integer address pattern.
70  virtual bool selectIntAddr(SDValue Addr, SDValue &Base,
71  SDValue &Offset) const;
72 
73  virtual bool selectIntAddrMM(SDValue Addr, SDValue &Base,
74  SDValue &Offset) const;
75 
76  virtual bool selectIntAddrLSL2MM(SDValue Addr, SDValue &Base,
77  SDValue &Offset) const;
78 
79  /// Match addr+simm10 and addr
80  virtual bool selectIntAddrMSA(SDValue Addr, SDValue &Base,
81  SDValue &Offset) const;
82 
83  virtual bool selectAddr16(SDNode *Parent, SDValue N, SDValue &Base,
84  SDValue &Offset, SDValue &Alias);
85 
86  /// \brief Select constant vector splats.
87  virtual bool selectVSplat(SDNode *N, APInt &Imm,
88  unsigned MinSizeInBits) const;
89  /// \brief Select constant vector splats whose value fits in a uimm1.
90  virtual bool selectVSplatUimm1(SDValue N, SDValue &Imm) const;
91  /// \brief Select constant vector splats whose value fits in a uimm2.
92  virtual bool selectVSplatUimm2(SDValue N, SDValue &Imm) const;
93  /// \brief Select constant vector splats whose value fits in a uimm3.
94  virtual bool selectVSplatUimm3(SDValue N, SDValue &Imm) const;
95  /// \brief Select constant vector splats whose value fits in a uimm4.
96  virtual bool selectVSplatUimm4(SDValue N, SDValue &Imm) const;
97  /// \brief Select constant vector splats whose value fits in a uimm5.
98  virtual bool selectVSplatUimm5(SDValue N, SDValue &Imm) const;
99  /// \brief Select constant vector splats whose value fits in a uimm6.
100  virtual bool selectVSplatUimm6(SDValue N, SDValue &Imm) const;
101  /// \brief Select constant vector splats whose value fits in a uimm8.
102  virtual bool selectVSplatUimm8(SDValue N, SDValue &Imm) const;
103  /// \brief Select constant vector splats whose value fits in a simm5.
104  virtual bool selectVSplatSimm5(SDValue N, SDValue &Imm) const;
105  /// \brief Select constant vector splats whose value is a power of 2.
106  virtual bool selectVSplatUimmPow2(SDValue N, SDValue &Imm) const;
107  /// \brief Select constant vector splats whose value is the inverse of a
108  /// power of 2.
109  virtual bool selectVSplatUimmInvPow2(SDValue N, SDValue &Imm) const;
110  /// \brief Select constant vector splats whose value is a run of set bits
111  /// ending at the most significant bit
112  virtual bool selectVSplatMaskL(SDValue N, SDValue &Imm) const;
113  /// \brief Select constant vector splats whose value is a run of set bits
114  /// starting at bit zero.
115  virtual bool selectVSplatMaskR(SDValue N, SDValue &Imm) const;
116 
117  SDNode *Select(SDNode *N) override;
118 
119  virtual std::pair<bool, SDNode*> selectNode(SDNode *Node) = 0;
120 
121  // getImm - Return a target constant with the specified value.
122  inline SDValue getImm(const SDNode *Node, uint64_t Imm) {
123  return CurDAG->getTargetConstant(Imm, SDLoc(Node), Node->getValueType(0));
124  }
125 
126  virtual void processFunctionAfterISel(MachineFunction &MF) = 0;
127 
128  bool SelectInlineAsmMemoryOperand(const SDValue &Op,
129  unsigned ConstraintID,
130  std::vector<SDValue> &OutOps) override;
131 };
132 }
133 
134 #endif
MachineFunction * MF
MipsDAGToDAGISel(MipsTargetMachine &TM)
EVT getValueType(unsigned ResNo) const
Return the type of a specified result.
const char * getPassName() const override
getPassName - Return a nice clean name for a pass.
const MipsSubtarget * Subtarget
Keep a pointer to the MipsSubtarget around so that we can make the right decision when generating cod...
SDValue getTargetConstant(uint64_t Val, SDLoc DL, EVT VT, bool isOpaque=false)
Definition: SelectionDAG.h:436
Wrapper class for IR location info (IR ordering and DebugLoc) to be passed into SDNode creation funct...
Represents one node in the SelectionDAG.
SelectionDAGISel - This is the common base class used for SelectionDAG-based pattern-matching instruc...
Class for arbitrary precision integers.
Definition: APInt.h:73
SDNode * getGlobalBaseReg()
getGlobalBaseReg - Output the instructions required to put the GOT address into a register...
#define N
Unlike LLVM values, Selection DAG nodes may return multiple values as the result of a computation...
bool runOnMachineFunction(MachineFunction &MF) override
runOnMachineFunction - This method must be overloaded to perform the desired machine code transformat...