MipsInstrInfo.h revision 20ada98de82cb23c3f075acbb09436760ef0923c 
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 "llvm/Support/ErrorHandling.h"
19#include "llvm/Target/TargetInstrInfo.h"
20#include "MipsRegisterInfo.h"
21
22namespace llvm {
23
24namespace Mips {
25
26  // Mips Branch Codes
27  enum FPBranchCode {
28    BRANCH_F,
29    BRANCH_T,
30    BRANCH_FL,
31    BRANCH_TL,
32    BRANCH_INVALID
33  };
34
35  // Mips Condition Codes
36  enum CondCode {
37    // To be used with float branch True
38    FCOND_F,
39    FCOND_UN,
40    FCOND_OEQ,
41    FCOND_UEQ,
42    FCOND_OLT,
43    FCOND_ULT,
44    FCOND_OLE,
45    FCOND_ULE,
46    FCOND_SF,
47    FCOND_NGLE,
48    FCOND_SEQ,
49    FCOND_NGL,
50    FCOND_LT,
51    FCOND_NGE,
52    FCOND_LE,
53    FCOND_NGT,
54
55    // To be used with float branch False
56    // This conditions have the same mnemonic as the
57    // above ones, but are used with a branch False;
58    FCOND_T,
59    FCOND_OR,
60    FCOND_UNE,
61    FCOND_ONE,
62    FCOND_UGE,
63    FCOND_OGE,
64    FCOND_UGT,
65    FCOND_OGT,
66    FCOND_ST,
67    FCOND_GLE,
68    FCOND_SNE,
69    FCOND_GL,
70    FCOND_NLT,
71    FCOND_GE,
72    FCOND_NLE,
73    FCOND_GT
74  };
75
76  /// GetOppositeBranchOpc - Return the inverse of the specified
77  /// opcode, e.g. turning BEQ to BNE.
78  unsigned GetOppositeBranchOpc(unsigned Opc);
79
80  /// MipsCCToString - Map each FP condition code to its string
81  inline static const char *MipsFCCToString(Mips::CondCode CC)
82  {
83    switch (CC) {
84      default: llvm_unreachable("Unknown condition code");
85      case FCOND_F:
86      case FCOND_T:   return "f";
87      case FCOND_UN:
88      case FCOND_OR:  return "un";
89      case FCOND_OEQ:
90      case FCOND_UNE: return "eq";
91      case FCOND_UEQ:
92      case FCOND_ONE: return "ueq";
93      case FCOND_OLT:
94      case FCOND_UGE: return "olt";
95      case FCOND_ULT:
96      case FCOND_OGE: return "ult";
97      case FCOND_OLE:
98      case FCOND_UGT: return "ole";
99      case FCOND_ULE:
100      case FCOND_OGT: return "ule";
101      case FCOND_SF:
102      case FCOND_ST:  return "sf";
103      case FCOND_NGLE:
104      case FCOND_GLE: return "ngle";
105      case FCOND_SEQ:
106      case FCOND_SNE: return "seq";
107      case FCOND_NGL:
108      case FCOND_GL:  return "ngl";
109      case FCOND_LT:
110      case FCOND_NLT: return "lt";
111      case FCOND_NGE:
112      case FCOND_GE:  return "nge";
113      case FCOND_LE:
114      case FCOND_NLE: return "le";
115      case FCOND_NGT:
116      case FCOND_GT:  return "ngt";
117    }
118  }
119}
120
121/// MipsII - This namespace holds all of the target specific flags that
122/// instruction info tracks.
123///
124namespace MipsII {
125  /// Target Operand Flag enum.
126  enum TOF {
127    //===------------------------------------------------------------------===//
128    // Mips Specific MachineOperand flags.
129
130    MO_NO_FLAG,
131
132    /// MO_GOT - Represents the offset into the global offset table at which
133    /// the address the relocation entry symbol resides during execution.
134    MO_GOT,
135
136    /// MO_GOT_CALL - Represents the offset into the global offset table at
137    /// which the address of a call site relocation entry symbol resides
138    /// during execution. This is different from the above since this flag
139    /// can only be present in call instructions.
140    MO_GOT_CALL,
141
142    /// MO_GPREL - Represents the offset from the current gp value to be used
143    /// for the relocatable object file being produced.
144    MO_GPREL,
145
146    /// MO_ABS_HILO - Represents the hi or low part of an absolute symbol
147    /// address.
148    MO_ABS_HILO
149
150  };
151}
152
153class MipsInstrInfo : public TargetInstrInfoImpl {
154  MipsTargetMachine &TM;
155  const MipsRegisterInfo RI;
156public:
157  explicit MipsInstrInfo(MipsTargetMachine &TM);
158
159  /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info.  As
160  /// such, whenever a client has an instance of instruction info, it should
161  /// always be able to get register info as well (through this method).
162  ///
163  virtual const MipsRegisterInfo &getRegisterInfo() const { return RI; }
164
165  /// isLoadFromStackSlot - If the specified machine instruction is a direct
166  /// load from a stack slot, return the virtual or physical register number of
167  /// the destination along with the FrameIndex of the loaded stack slot.  If
168  /// not, return 0.  This predicate must return 0 if the instruction has
169  /// any side effects other than loading from the stack slot.
170  virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
171                                       int &FrameIndex) const;
172
173  /// isStoreToStackSlot - If the specified machine instruction is a direct
174  /// store to a stack slot, return the virtual or physical register number of
175  /// the source reg along with the FrameIndex of the loaded stack slot.  If
176  /// not, return 0.  This predicate must return 0 if the instruction has
177  /// any side effects other than storing to the stack slot.
178  virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
179                                      int &FrameIndex) const;
180
181  /// Branch Analysis
182  virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
183                             MachineBasicBlock *&FBB,
184                             SmallVectorImpl<MachineOperand> &Cond,
185                             bool AllowModify) const;
186  virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
187
188private:
189  void BuildCondBr(MachineBasicBlock &MBB, MachineBasicBlock *TBB, DebugLoc DL,
190                   const SmallVectorImpl<MachineOperand>& Cond) const;
191
192public:
193  virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
194                                MachineBasicBlock *FBB,
195                                const SmallVectorImpl<MachineOperand> &Cond,
196                                DebugLoc DL) const;
197  virtual void copyPhysReg(MachineBasicBlock &MBB,
198                           MachineBasicBlock::iterator MI, DebugLoc DL,
199                           unsigned DestReg, unsigned SrcReg,
200                           bool KillSrc) const;
201  virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
202                                   MachineBasicBlock::iterator MBBI,
203                                   unsigned SrcReg, bool isKill, int FrameIndex,
204                                   const TargetRegisterClass *RC,
205                                   const TargetRegisterInfo *TRI) const;
206
207  virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
208                                    MachineBasicBlock::iterator MBBI,
209                                    unsigned DestReg, int FrameIndex,
210                                    const TargetRegisterClass *RC,
211                                    const TargetRegisterInfo *TRI) const;
212
213  virtual
214  bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
215
216  /// Insert nop instruction when hazard condition is found
217  virtual void insertNoop(MachineBasicBlock &MBB,
218                          MachineBasicBlock::iterator MI) const;
219
220  /// getGlobalBaseReg - Return a virtual register initialized with the
221  /// the global base register value. Output instructions required to
222  /// initialize the register in the function entry block, if necessary.
223  ///
224  unsigned getGlobalBaseReg(MachineFunction *MF) const;
225};
226
227}
228
229#endif
230