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"
25 /// ARMII - This namespace holds all of the target specific flags that
26 /// instruction info tracks.
30 //===------------------------------------------------------------------===//
33 //===------------------------------------------------------------------===//
34 // This four-bit field describes the addressing mode used.
47 AddrModeT1_s = 10, // i8 * 4 for pc and sp relative data
51 AddrModeT2_pc = 14, // +/- i12 for pc relative data
52 AddrModeT2_i8s4 = 15, // i8 * 4
54 // Size* - Flags to keep track of the size of an instruction.
56 SizeMask = 7 << SizeShift,
57 SizeSpecial = 1, // 0 byte pseudo or special case.
62 // IndexMode - Unindex, pre-indexed, or post-indexed. Only valid for load
65 IndexModeMask = 3 << IndexModeShift,
69 //===------------------------------------------------------------------===//
70 // Instruction encoding formats.
73 FormMask = 0x3f << FormShift,
75 // Pseudo instructions
76 Pseudo = 0 << FormShift,
78 // Multiply instructions
79 MulFrm = 1 << FormShift,
81 // Branch instructions
82 BrFrm = 2 << FormShift,
83 BrMiscFrm = 3 << FormShift,
85 // Data Processing instructions
86 DPFrm = 4 << FormShift,
87 DPSoRegFrm = 5 << FormShift,
90 LdFrm = 6 << FormShift,
91 StFrm = 7 << FormShift,
92 LdMiscFrm = 8 << FormShift,
93 StMiscFrm = 9 << FormShift,
94 LdStMulFrm = 10 << FormShift,
96 // Miscellaneous arithmetic instructions
97 ArithMiscFrm = 11 << FormShift,
99 // Extend instructions
100 ExtFrm = 12 << FormShift,
103 VFPUnaryFrm = 13 << FormShift,
104 VFPBinaryFrm = 14 << FormShift,
105 VFPConv1Frm = 15 << FormShift,
106 VFPConv2Frm = 16 << FormShift,
107 VFPConv3Frm = 17 << FormShift,
108 VFPConv4Frm = 18 << FormShift,
109 VFPConv5Frm = 19 << FormShift,
110 VFPLdStFrm = 20 << FormShift,
111 VFPLdStMulFrm = 21 << FormShift,
112 VFPMiscFrm = 22 << FormShift,
115 ThumbFrm = 23 << FormShift,
118 NEONFrm = 24 << FormShift,
119 NEONGetLnFrm = 25 << FormShift,
120 NEONSetLnFrm = 26 << FormShift,
121 NEONDupFrm = 27 << FormShift,
123 //===------------------------------------------------------------------===//
126 // UnaryDP - Indicates this is a unary data processing instruction, i.e.
127 // it doesn't have a Rn operand.
130 // Xform16Bit - Indicates this Thumb2 instruction may be transformed into
131 // a 16-bit Thumb instruction if certain conditions are met.
132 Xform16Bit = 1 << 16,
134 //===------------------------------------------------------------------===//
135 // Field shifts - such shifts are used to set field while generating
136 // machine instructions.
160 class ARMBaseInstrInfo : public TargetInstrInfoImpl {
162 // Can be only subclassed.
163 explicit ARMBaseInstrInfo(const ARMSubtarget &sti);
165 // Return the non-pre/post incrementing version of 'Opc'. Return 0
166 // if there is not such an opcode.
167 virtual unsigned getUnindexedOpcode(unsigned Opc) const =0;
169 // Return true if the block does not fall through.
170 virtual bool BlockHasNoFallThrough(const MachineBasicBlock &MBB) const =0;
172 virtual MachineInstr *convertToThreeAddress(MachineFunction::iterator &MFI,
173 MachineBasicBlock::iterator &MBBI,
174 LiveVariables *LV) const;
176 virtual const ARMBaseRegisterInfo &getRegisterInfo() const =0;
179 virtual bool AnalyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
180 MachineBasicBlock *&FBB,
181 SmallVectorImpl<MachineOperand> &Cond,
182 bool AllowModify) const;
183 virtual unsigned RemoveBranch(MachineBasicBlock &MBB) const;
184 virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
185 MachineBasicBlock *FBB,
186 const SmallVectorImpl<MachineOperand> &Cond) const;
189 bool ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const;
191 // Predication support.
192 bool isPredicated(const MachineInstr *MI) const {
193 int PIdx = MI->findFirstPredOperandIdx();
194 return PIdx != -1 && MI->getOperand(PIdx).getImm() != ARMCC::AL;
197 ARMCC::CondCodes getPredicate(const MachineInstr *MI) const {
198 int PIdx = MI->findFirstPredOperandIdx();
199 return PIdx != -1 ? (ARMCC::CondCodes)MI->getOperand(PIdx).getImm()
204 bool PredicateInstruction(MachineInstr *MI,
205 const SmallVectorImpl<MachineOperand> &Pred) const;
208 bool SubsumesPredicate(const SmallVectorImpl<MachineOperand> &Pred1,
209 const SmallVectorImpl<MachineOperand> &Pred2) const;
211 virtual bool DefinesPredicate(MachineInstr *MI,
212 std::vector<MachineOperand> &Pred) const;
214 /// GetInstSize - Returns the size of the specified MachineInstr.
216 virtual unsigned GetInstSizeInBytes(const MachineInstr* MI) const;
218 /// Return true if the instruction is a register to register move and return
219 /// the source and dest operands and their sub-register indices by reference.
220 virtual bool isMoveInstr(const MachineInstr &MI,
221 unsigned &SrcReg, unsigned &DstReg,
222 unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
224 virtual unsigned isLoadFromStackSlot(const MachineInstr *MI,
225 int &FrameIndex) const;
226 virtual unsigned isStoreToStackSlot(const MachineInstr *MI,
227 int &FrameIndex) const;
229 virtual bool copyRegToReg(MachineBasicBlock &MBB,
230 MachineBasicBlock::iterator I,
231 unsigned DestReg, unsigned SrcReg,
232 const TargetRegisterClass *DestRC,
233 const TargetRegisterClass *SrcRC) const;
235 virtual void storeRegToStackSlot(MachineBasicBlock &MBB,
236 MachineBasicBlock::iterator MBBI,
237 unsigned SrcReg, bool isKill, int FrameIndex,
238 const TargetRegisterClass *RC) const;
240 virtual void loadRegFromStackSlot(MachineBasicBlock &MBB,
241 MachineBasicBlock::iterator MBBI,
242 unsigned DestReg, int FrameIndex,
243 const TargetRegisterClass *RC) const;
245 virtual bool canFoldMemoryOperand(const MachineInstr *MI,
246 const SmallVectorImpl<unsigned> &Ops) const;
248 virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
250 const SmallVectorImpl<unsigned> &Ops,
251 int FrameIndex) const;
253 virtual MachineInstr* foldMemoryOperandImpl(MachineFunction &MF,
255 const SmallVectorImpl<unsigned> &Ops,
256 MachineInstr* LoadMI) const;
261 const MachineInstrBuilder &AddDefaultPred(const MachineInstrBuilder &MIB) {
262 return MIB.addImm((int64_t)ARMCC::AL).addReg(0);
266 const MachineInstrBuilder &AddDefaultCC(const MachineInstrBuilder &MIB) {
267 return MIB.addReg(0);
271 const MachineInstrBuilder &AddDefaultT1CC(const MachineInstrBuilder &MIB) {
272 return MIB.addReg(ARM::CPSR);
276 bool isUncondBranchOpcode(int Opc) {
277 return Opc == ARM::B || Opc == ARM::tB || Opc == ARM::t2B;
281 bool isCondBranchOpcode(int Opc) {
282 return Opc == ARM::Bcc || Opc == ARM::tBcc || Opc == ARM::t2Bcc;
286 bool isJumpTableBranchOpcode(int Opc) {
287 return Opc == ARM::BR_JTr || Opc == ARM::BR_JTm || Opc == ARM::BR_JTadd ||
288 Opc == ARM::tBR_JTr || Opc == ARM::t2BR_JT;
291 int getMatchingCondBranchOpcode(int Opc);
293 /// emitARMRegPlusImmediate / emitT2RegPlusImmediate - Emits a series of
294 /// instructions to materializea destreg = basereg + immediate in ARM / Thumb2
296 void emitARMRegPlusImmediate(MachineBasicBlock &MBB,
297 MachineBasicBlock::iterator &MBBI, DebugLoc dl,
298 unsigned DestReg, unsigned BaseReg, int NumBytes,
299 ARMCC::CondCodes Pred, unsigned PredReg,
300 const ARMBaseInstrInfo &TII);
302 void emitT2RegPlusImmediate(MachineBasicBlock &MBB,
303 MachineBasicBlock::iterator &MBBI, DebugLoc dl,
304 unsigned DestReg, unsigned BaseReg, int NumBytes,
305 ARMCC::CondCodes Pred, unsigned PredReg,
306 const ARMBaseInstrInfo &TII);
309 /// rewriteARMFrameIndex / rewriteT2FrameIndex -
310 /// Rewrite MI to access 'Offset' bytes from the FP. Return the offset that
311 /// could not be handled directly in MI.
312 int rewriteARMFrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
313 unsigned FrameReg, int Offset,
314 const ARMBaseInstrInfo &TII);
316 int rewriteT2FrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
317 unsigned FrameReg, int Offset,
318 const ARMBaseInstrInfo &TII);
320 } // End llvm namespace