1 //===- ARMInstrInfo.h - ARM 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 ARM implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #ifndef ARMINSTRUCTIONINFO_H
15 #define ARMINSTRUCTIONINFO_H
17 #include "llvm/Target/TargetInstrInfo.h"
18 #include "ARMRegisterInfo.h"
24 /// ARMII - This namespace holds all of the target specific flags that
25 /// instruction info tracks.
29 //===------------------------------------------------------------------===//
32 //===------------------------------------------------------------------===//
33 // This four-bit field describes the addressing mode used.
46 AddrModeT1_s = 10, // i8 * 4 for pc and sp relative data
50 AddrModeT2_pc = 14, // +/- i12 for pc relative data
51 AddrModeT2_i8s4 = 15, // i8 * 4
53 // Size* - Flags to keep track of the size of an instruction.
55 SizeMask = 7 << SizeShift,
56 SizeSpecial = 1, // 0 byte pseudo or special case.
61 // IndexMode - Unindex, pre-indexed, or post-indexed. Only valid for load
64 IndexModeMask = 3 << IndexModeShift,
68 //===------------------------------------------------------------------===//
69 // Instruction encoding formats.
72 FormMask = 0x3f << FormShift,
74 // Pseudo instructions
75 Pseudo = 0 << FormShift,
77 // Multiply instructions
78 MulFrm = 1 << FormShift,
80 // Branch instructions
81 BrFrm = 2 << FormShift,
82 BrMiscFrm = 3 << FormShift,
84 // Data Processing instructions
85 DPFrm = 4 << FormShift,
86 DPSoRegFrm = 5 << FormShift,
89 LdFrm = 6 << FormShift,
90 StFrm = 7 << FormShift,
91 LdMiscFrm = 8 << FormShift,
92 StMiscFrm = 9 << FormShift,
93 LdStMulFrm = 10 << FormShift,
95 // Miscellaneous arithmetic instructions
96 ArithMiscFrm = 11 << FormShift,
98 // Extend instructions
99 ExtFrm = 12 << FormShift,
102 VFPUnaryFrm = 13 << FormShift,
103 VFPBinaryFrm = 14 << FormShift,
104 VFPConv1Frm = 15 << FormShift,
105 VFPConv2Frm = 16 << FormShift,
106 VFPConv3Frm = 17 << FormShift,
107 VFPConv4Frm = 18 << FormShift,
108 VFPConv5Frm = 19 << FormShift,
109 VFPLdStFrm = 20 << FormShift,
110 VFPLdStMulFrm = 21 << FormShift,
111 VFPMiscFrm = 22 << FormShift,
114 ThumbFrm = 23 << FormShift,
117 NEONFrm = 24 << FormShift,
118 NEONGetLnFrm = 25 << FormShift,
119 NEONSetLnFrm = 26 << FormShift,
120 NEONDupFrm = 27 << FormShift,
122 //===------------------------------------------------------------------===//
125 // UnaryDP - Indicates this is a unary data processing instruction, i.e.
126 // it doesn't have a Rn operand.
129 // Xform16Bit - Indicates this Thumb2 instruction may be transformed into
130 // a 16-bit Thumb instruction if certain conditions are met.
131 Xform16Bit = 1 << 16,
133 //===------------------------------------------------------------------===//
134 // Field shifts - such shifts are used to set field while generating
135 // machine instructions.
159 class ARMBaseInstrInfo : public TargetInstrInfoImpl {
161 // Can be only subclassed.
162 explicit ARMBaseInstrInfo(const ARMSubtarget &STI);
164 virtual MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
165 MachineBasicBlock::iterator &MBBI,
166 LiveVariables *LV) const;
168 virtual const ARMBaseRegisterInfo &getRegisterInfo() const =0;
171 virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
172 MachineBasicBlock *&FBB,
173 SmallVectorImpl<MachineOperand> &Cond,
174 bool AllowModify) const;
175 virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
176 virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
177 MachineBasicBlock *FBB,
178 const SmallVectorImpl<MachineOperand> &Cond) const;
180 virtual bool BlockHasNoFallThrough(const MachineBasicBlock &MBB) const;
182 bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
184 // Predication support.
185 virtual bool isPredicated(const MachineInstr *MI) const;
187 ARMCC::CondCodes getPredicate(const MachineInstr *MI) const {
188 int PIdx = MI->findFirstPredOperandIdx();
189 return PIdx != -1 ? (ARMCC::CondCodes)MI->getOperand(PIdx).getImm()
194 bool PredicateInstruction(MachineInstr *MI,
195 const SmallVectorImpl<MachineOperand> &Pred) const;
198 bool SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
199 const SmallVectorImpl<MachineOperand> &Pred2) const;
201 virtual bool DefinesPredicate(MachineInstr *MI,
202 std::vector<MachineOperand> &Pred) const;
204 /// GetInstSize - Returns the size of the specified MachineInstr.
206 virtual unsigned GetInstSizeInBytes(const MachineInstr* MI) const;
208 /// Return true if the instruction is a register to register move and return
209 /// the source and dest operands and their sub-register indices by reference.
210 virtual bool isMoveInstr(const MachineInstr &MI,
211 unsigned &SrcReg, unsigned &DstReg,
212 unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
214 virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
215 int &FrameIndex) const;
216 virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
217 int &FrameIndex) const;
219 virtual bool copyRegToReg(MachineBasicBlock &MBB,
220 MachineBasicBlock::iterator I,
221 unsigned DestReg, unsigned SrcReg,
222 const TargetRegisterClass *DestRC,
223 const TargetRegisterClass *SrcRC) const;
224 virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
225 MachineBasicBlock::iterator MBBI,
226 unsigned SrcReg, bool isKill, int FrameIndex,
227 const TargetRegisterClass *RC) const;
229 virtual void storeRegToAddr(MachineFunction &MF, unsigned SrcReg, bool isKill,
230 SmallVectorImpl<MachineOperand> &Addr,
231 const TargetRegisterClass *RC,
232 SmallVectorImpl<MachineInstr*> &NewMIs) const;
234 virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
235 MachineBasicBlock::iterator MBBI,
236 unsigned DestReg, int FrameIndex,
237 const TargetRegisterClass *RC) const;
239 virtual void loadRegFromAddr(MachineFunction &MF, unsigned DestReg,
240 SmallVectorImpl<MachineOperand> &Addr,
241 const TargetRegisterClass *RC,
242 SmallVectorImpl<MachineInstr*> &NewMIs) const;
244 virtual bool canFoldMemoryOperand(const MachineInstr *MI,
245 const SmallVectorImpl<unsigned> &Ops) const;
247 virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
249 const SmallVectorImpl<unsigned> &Ops,
250 int FrameIndex) const;
252 virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
254 const SmallVectorImpl<unsigned> &Ops,
255 MachineInstr* LoadMI) const;
258 class ARMInstrInfo : public ARMBaseInstrInfo {
261 explicit ARMInstrInfo(const ARMSubtarget &STI);
263 /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As
264 /// such, whenever a client has an instance of instruction info, it should
265 /// always be able to get register info as well (through this method).
267 const ARMRegisterInfo &getRegisterInfo() const { return RI; }
269 void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
270 unsigned DestReg, const MachineInstr *Orig) const;