MipsISelDAGToDAG.h revision 1d905668ddaab127eb6f9668b6314afbef7bee20 
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 MIPSISELDAGTODAG_H
15#define MIPSISELDAGTODAG_H
16
17#include "Mips.h"
18#include "MipsSubtarget.h"
19#include "MipsTargetMachine.h"
20#include "llvm/CodeGen/SelectionDAGISel.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//===----------------------------------------------------------------------===//
30namespace llvm {
31
32class MipsDAGToDAGISel : public SelectionDAGISel {
33public:
34  explicit MipsDAGToDAGISel(MipsTargetMachine &TM)
35    : SelectionDAGISel(TM), Subtarget(TM.getSubtarget<MipsSubtarget>()) {}
36
37  // Pass Name
38  virtual const char *getPassName() const {
39    return "MIPS DAG->DAG Pattern Instruction Selection";
40  }
41
42  virtual bool runOnMachineFunction(MachineFunction &MF);
43
44protected:
45  SDNode *getGlobalBaseReg();
46
47  /// Keep a pointer to the MipsSubtarget around so that we can make the right
48  /// decision when generating code for different targets.
49  const MipsSubtarget &Subtarget;
50
51private:
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  /// Fall back on this function if all else fails.
61  virtual bool selectAddrDefault(SDValue Addr, SDValue &Base,
62                                 SDValue &Offset) const;
63
64  /// Match integer address pattern.
65  virtual bool selectIntAddr(SDValue Addr, SDValue &Base,
66                             SDValue &Offset) const;
67
68  virtual bool SelectAddr16(SDNode *Parent, SDValue N, SDValue &Base,
69                            SDValue &Offset, SDValue &Alias);
70
71  virtual SDNode *Select(SDNode *N);
72
73  virtual std::pair<bool, SDNode*> SelectNode(SDNode *Node) = 0;
74
75  // getImm - Return a target constant with the specified value.
76  inline SDValue getImm(const SDNode *Node, uint64_t Imm) {
77    return CurDAG->getTargetConstant(Imm, Node->getValueType(0));
78  }
79
80  virtual void ProcessFunctionAfterISel(MachineFunction &MF) = 0;
81
82  virtual bool SelectInlineAsmMemoryOperand(const SDValue &Op,
83                                            char ConstraintCode,
84                                            std::vector<SDValue> &OutOps);
85};
86
87/// createMipsISelDag - This pass converts a legalized DAG into a
88/// MIPS-specific DAG, ready for instruction scheduling.
89FunctionPass *createMipsISelDag(MipsTargetMachine &TM);
90
91}
92
93#endif
94