1 //===- MBlazeInstrInfo.h - MBlaze Instruction Information -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the MBlaze implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #ifndef MBLAZEINSTRUCTIONINFO_H
15 #define MBLAZEINSTRUCTIONINFO_H
18 #include "llvm/Support/ErrorHandling.h"
19 #include "llvm/Target/TargetInstrInfo.h"
20 #include "MBlazeRegisterInfo.h"
26 // MBlaze Branch Codes
35 // MBlaze Condition Codes
37 // To be used with float branch True
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;
75 // Only integer conditions
85 // Turn condition code into conditional branch opcode.
86 unsigned GetCondBranchFromCond(CondCode CC);
88 /// GetOppositeBranchCondition - Return the inverse of the specified cond,
89 /// e.g. turning COND_E to COND_NE.
90 CondCode GetOppositeBranchCondition(MBlaze::CondCode CC);
92 /// MBlazeCCToString - Map each FP condition code to its string
93 inline static const char *MBlazeFCCToString(MBlaze::CondCode CC)
96 default: llvm_unreachable("Unknown condition code");
98 case FCOND_T: return "f";
100 case FCOND_OR: return "un";
102 case FCOND_NEQ: return "eq";
104 case FCOND_OGL: return "ueq";
106 case FCOND_UGE: return "olt";
108 case FCOND_OGE: return "ult";
110 case FCOND_UGT: return "ole";
112 case FCOND_OGT: return "ule";
114 case FCOND_ST: return "sf";
116 case FCOND_GLE: return "ngle";
118 case FCOND_SNE: return "seq";
120 case FCOND_GL: return "ngl";
122 case FCOND_NLT: return "lt";
124 case FCOND_GE: return "ge";
126 case FCOND_NLE: return "nle";
128 case FCOND_GT: return "gt";
133 /// MBlazeII - This namespace holds all of the target specific flags that
134 /// instruction info tracks.
137 /// Target Operand Flag enum.
139 //===------------------------------------------------------------------===//
140 // MBlaze Specific MachineOperand flags.
143 /// MO_GOT - Represents the offset into the global offset table at which
144 /// the address the relocation entry symbol resides during execution.
147 /// MO_GOT_CALL - Represents the offset into the global offset table at
148 /// which the address of a call site relocation entry symbol resides
149 /// during execution. This is different from the above since this flag
150 /// can only be present in call instructions.
153 /// MO_GPREL - Represents the offset from the current gp value to be used
154 /// for the relocatable object file being produced.
157 /// MO_ABS_HILO - Represents the hi or low part of an absolute symbol
164 class MBlazeInstrInfo : public TargetInstrInfoImpl {
165 MBlazeTargetMachine &TM;
166 const MBlazeRegisterInfo RI;
168 explicit MBlazeInstrInfo(MBlazeTargetMachine &TM);
170 /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As
171 /// such, whenever a client has an instance of instruction info, it should
172 /// always be able to get register info as well (through this method).
174 virtual const MBlazeRegisterInfo &getRegisterInfo() const { return RI; }
176 /// Return true if the instruction is a register to register move and return
177 /// the source and dest operands and their sub-register indices by reference.
178 virtual bool isMoveInstr(const MachineInstr &MI,
179 unsigned &SrcReg, unsigned &DstReg,
180 unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
182 /// isLoadFromStackSlot - If the specified machine instruction is a direct
183 /// load from a stack slot, return the virtual or physical register number of
184 /// the destination along with the FrameIndex of the loaded stack slot. If
185 /// not, return 0. This predicate must return 0 if the instruction has
186 /// any side effects other than loading from the stack slot.
187 virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
188 int &FrameIndex) const;
190 /// isStoreToStackSlot - If the specified machine instruction is a direct
191 /// store to a stack slot, return the virtual or physical register number of
192 /// the source reg along with the FrameIndex of the loaded stack slot. If
193 /// not, return 0. This predicate must return 0 if the instruction has
194 /// any side effects other than storing to the stack slot.
195 virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
196 int &FrameIndex) const;
199 virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
200 MachineBasicBlock *FBB,
201 const SmallVectorImpl<MachineOperand> &Cond) const;
202 virtual bool copyRegToReg(MachineBasicBlock &MBB,
203 MachineBasicBlock::iterator I,
204 unsigned DestReg, unsigned SrcReg,
205 const TargetRegisterClass *DestRC,
206 const TargetRegisterClass *SrcRC) const;
207 virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
208 MachineBasicBlock::iterator MBBI,
209 unsigned SrcReg, bool isKill, int FrameIndex,
210 const TargetRegisterClass *RC) const;
212 virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
213 MachineBasicBlock::iterator MBBI,
214 unsigned DestReg, int FrameIndex,
215 const TargetRegisterClass *RC) const;
217 virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
219 const SmallVectorImpl<unsigned> &Ops,
220 int FrameIndex) const;
222 virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
224 const SmallVectorImpl<unsigned> &Ops,
225 MachineInstr* LoadMI) const {
229 /// Insert nop instruction when hazard condition is found
230 virtual void insertNoop(MachineBasicBlock &MBB,
231 MachineBasicBlock::iterator MI) const;
233 /// getGlobalBaseReg - Return a virtual register initialized with the
234 /// the global base register value. Output instructions required to
235 /// initialize the register in the function entry block, if necessary.
237 unsigned getGlobalBaseReg(MachineFunction *MF) const;