1 //===- ARMBaseInstrInfo.h - ARM Base 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 Base ARM implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #ifndef ARMBASEINSTRUCTIONINFO_H
15 #define ARMBASEINSTRUCTIONINFO_H
18 #include "ARMRegisterInfo.h"
19 #include "llvm/CodeGen/MachineInstrBuilder.h"
20 #include "llvm/Target/TargetInstrInfo.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 //===------------------------------------------------------------------===//
136 DomainMask = 3 << DomainShift,
137 DomainGeneral = 0 << DomainShift,
138 DomainVFP = 1 << DomainShift,
139 DomainNEON = 2 << DomainShift,
141 //===------------------------------------------------------------------===//
142 // Field shifts - such shifts are used to set field while generating
143 // machine instructions.
167 class ARMBaseInstrInfo : public TargetInstrInfoImpl {
168 const ARMSubtarget& Subtarget;
170 // Can be only subclassed.
171 explicit ARMBaseInstrInfo(const ARMSubtarget &STI);
173 // Return the non-pre/post incrementing version of 'Opc'. Return 0
174 // if there is not such an opcode.
175 virtual unsigned getUnindexedOpcode(unsigned Opc) const =0;
177 // Return true if the block does not fall through.
178 virtual bool BlockHasNoFallThrough(const MachineBasicBlock &MBB) const =0;
180 virtual MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
181 MachineBasicBlock::iterator &MBBI,
182 LiveVariables *LV) const;
184 virtual const ARMBaseRegisterInfo &getRegisterInfo() const =0;
185 const ARMSubtarget &getSubtarget() const { return Subtarget; }
188 virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
189 MachineBasicBlock *&FBB,
190 SmallVectorImpl<MachineOperand> &Cond,
191 bool AllowModify) const;
192 virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
193 virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
194 MachineBasicBlock *FBB,
195 const SmallVectorImpl<MachineOperand> &Cond) const;
198 bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
200 // Predication support.
201 bool isPredicated(const MachineInstr *MI) const {
202 int PIdx = MI->findFirstPredOperandIdx();
203 return PIdx != -1 && MI->getOperand(PIdx).getImm() != ARMCC::AL;
206 ARMCC::CondCodes getPredicate(const MachineInstr *MI) const {
207 int PIdx = MI->findFirstPredOperandIdx();
208 return PIdx != -1 ? (ARMCC::CondCodes)MI->getOperand(PIdx).getImm()
213 bool PredicateInstruction(MachineInstr *MI,
214 const SmallVectorImpl<MachineOperand> &Pred) const;
217 bool SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
218 const SmallVectorImpl<MachineOperand> &Pred2) const;
220 virtual bool DefinesPredicate(MachineInstr *MI,
221 std::vector<MachineOperand> &Pred) const;
223 virtual bool isPredicable(MachineInstr *MI) const;
225 /// GetInstSize - Returns the size of the specified MachineInstr.
227 virtual unsigned GetInstSizeInBytes(const MachineInstr* MI) const;
229 /// Return true if the instruction is a register to register move and return
230 /// the source and dest operands and their sub-register indices by reference.
231 virtual bool isMoveInstr(const MachineInstr &MI,
232 unsigned &SrcReg, unsigned &DstReg,
233 unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
235 virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
236 int &FrameIndex) const;
237 virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
238 int &FrameIndex) const;
240 virtual bool copyRegToReg(MachineBasicBlock &MBB,
241 MachineBasicBlock::iterator I,
242 unsigned DestReg, unsigned SrcReg,
243 const TargetRegisterClass *DestRC,
244 const TargetRegisterClass *SrcRC) const;
246 virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
247 MachineBasicBlock::iterator MBBI,
248 unsigned SrcReg, bool isKill, int FrameIndex,
249 const TargetRegisterClass *RC) const;
251 virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
252 MachineBasicBlock::iterator MBBI,
253 unsigned DestReg, int FrameIndex,
254 const TargetRegisterClass *RC) const;
256 virtual bool canFoldMemoryOperand(const MachineInstr *MI,
257 const SmallVectorImpl<unsigned> &Ops) const;
259 virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
261 const SmallVectorImpl<unsigned> &Ops,
262 int FrameIndex) const;
264 virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
266 const SmallVectorImpl<unsigned> &Ops,
267 MachineInstr* LoadMI) const;
269 virtual void reMaterialize(MachineBasicBlock &MBB,
270 MachineBasicBlock::iterator MI,
271 unsigned DestReg, unsigned SubIdx,
272 const MachineInstr *Orig,
273 const TargetRegisterInfo *TRI) const;
275 virtual bool isIdentical(const MachineInstr *MI, const MachineInstr *Other,
276 const MachineRegisterInfo *MRI) const;
278 virtual unsigned TailDuplicationLimit(const MachineBasicBlock &MBB,
279 unsigned DefaultLimit) const;
283 const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) {
284 return MIB.addImm((int64_t)ARMCC::AL).addReg(0);
288 const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) {
289 return MIB.addReg(0);
293 const MachineInstrBuilder &AddDefaultT1CC(const MachineInstrBuilder &MIB,
294 bool isDead = false) {
295 return MIB.addReg(ARM::CPSR, getDefRegState(true) | getDeadRegState(isDead));
299 const MachineInstrBuilder &AddNoT1CC(const MachineInstrBuilder &MIB) {
300 return MIB.addReg(0);
304 bool isUncondBranchOpcode(int Opc) {
305 return Opc == ARM::B || Opc == ARM::tB || Opc == ARM::t2B;
309 bool isCondBranchOpcode(int Opc) {
310 return Opc == ARM::Bcc || Opc == ARM::tBcc || Opc == ARM::t2Bcc;
314 bool isJumpTableBranchOpcode(int Opc) {
315 return Opc == ARM::BR_JTr || Opc == ARM::BR_JTm || Opc == ARM::BR_JTadd ||
316 Opc == ARM::tBR_JTr || Opc == ARM::t2BR_JT;
320 bool isIndirectBranchOpcode(int Opc) {
321 return Opc == ARM::BRIND || Opc == ARM::tBRIND;
324 /// getInstrPredicate - If instruction is predicated, returns its predicate
325 /// condition, otherwise returns AL. It also returns the condition code
326 /// register by reference.
327 ARMCC::CondCodes getInstrPredicate(const MachineInstr *MI, unsigned &PredReg);
329 int getMatchingCondBranchOpcode(int Opc);
331 /// emitARMRegPlusImmediate / emitT2RegPlusImmediate - Emits a series of
332 /// instructions to materializea destreg = basereg + immediate in ARM / Thumb2
334 void emitARMRegPlusImmediate(MachineBasicBlock &MBB,
335 MachineBasicBlock::iterator &MBBI, DebugLoc dl,
336 unsigned DestReg, unsigned BaseReg, int NumBytes,
337 ARMCC::CondCodes Pred, unsigned PredReg,
338 const ARMBaseInstrInfo &TII);
340 void emitT2RegPlusImmediate(MachineBasicBlock &MBB,
341 MachineBasicBlock::iterator &MBBI, DebugLoc dl,
342 unsigned DestReg, unsigned BaseReg, int NumBytes,
343 ARMCC::CondCodes Pred, unsigned PredReg,
344 const ARMBaseInstrInfo &TII);
347 /// rewriteARMFrameIndex / rewriteT2FrameIndex -
348 /// Rewrite MI to access 'Offset' bytes from the FP. Return false if the
349 /// offset could not be handled directly in MI, and return the left-over
350 /// portion by reference.
351 bool rewriteARMFrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
352 unsigned FrameReg, int &Offset,
353 const ARMBaseInstrInfo &TII);
355 bool rewriteT2FrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
356 unsigned FrameReg, int &Offset,
357 const ARMBaseInstrInfo &TII);
359 } // End llvm namespace