1 //===-- Thumb2InstrInfo.h - Thumb-2 Instruction Information -----*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file contains the Thumb-2 implementation of the TargetInstrInfo class. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_ARM_THUMB2INSTRINFO_H 14 #define LLVM_LIB_TARGET_ARM_THUMB2INSTRINFO_H 15 16 #include "ARMBaseInstrInfo.h" 17 #include "ThumbRegisterInfo.h" 18 19 namespace llvm { 20 class ARMSubtarget; 21 22 class Thumb2InstrInfo : public ARMBaseInstrInfo { 23 ThumbRegisterInfo RI; 24 public: 25 explicit Thumb2InstrInfo(const ARMSubtarget &STI); 26 27 /// Return the noop instruction to use for a noop. 28 MCInst getNop() const override; 29 30 // Return the non-pre/post incrementing version of 'Opc'. Return 0 31 // if there is not such an opcode. 32 unsigned getUnindexedOpcode(unsigned Opc) const override; 33 34 void ReplaceTailWithBranchTo(MachineBasicBlock::iterator Tail, 35 MachineBasicBlock *NewDest) const override; 36 37 bool isLegalToSplitMBBAt(MachineBasicBlock &MBB, 38 MachineBasicBlock::iterator MBBI) const override; 39 40 void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 41 const DebugLoc &DL, MCRegister DestReg, MCRegister SrcReg, 42 bool KillSrc) const override; 43 44 void storeRegToStackSlot(MachineBasicBlock &MBB, 45 MachineBasicBlock::iterator MBBI, Register SrcReg, 46 bool isKill, int FrameIndex, 47 const TargetRegisterClass *RC, 48 const TargetRegisterInfo *TRI, 49 Register VReg) const override; 50 51 void loadRegFromStackSlot(MachineBasicBlock &MBB, 52 MachineBasicBlock::iterator MBBI, Register DestReg, 53 int FrameIndex, const TargetRegisterClass *RC, 54 const TargetRegisterInfo *TRI, 55 Register VReg) const override; 56 57 /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As 58 /// such, whenever a client has an instance of instruction info, it should 59 /// always be able to get register info as well (through this method). 60 /// 61 const ThumbRegisterInfo &getRegisterInfo() const override { return RI; } 62 63 MachineInstr *optimizeSelect(MachineInstr &MI, 64 SmallPtrSetImpl<MachineInstr *> &SeenMIs, 65 bool) const override; 66 67 MachineInstr *commuteInstructionImpl(MachineInstr &MI, bool NewMI, 68 unsigned OpIdx1, 69 unsigned OpIdx2) const override; 70 71 private: 72 void expandLoadStackGuard(MachineBasicBlock::iterator MI) const override; 73 }; 74 75 /// getITInstrPredicate - Valid only in Thumb2 mode. This function is identical 76 /// to llvm::getInstrPredicate except it returns AL for conditional branch 77 /// instructions which are "predicated", but are not in IT blocks. 78 ARMCC::CondCodes getITInstrPredicate(const MachineInstr &MI, Register &PredReg); 79 80 // getVPTInstrPredicate: VPT analogue of that, plus a helper function 81 // corresponding to MachineInstr::findFirstPredOperandIdx. 82 int findFirstVPTPredOperandIdx(const MachineInstr &MI); 83 ARMVCC::VPTCodes getVPTInstrPredicate(const MachineInstr &MI, 84 Register &PredReg); 85 inline ARMVCC::VPTCodes getVPTInstrPredicate(const MachineInstr &MI) { 86 Register PredReg; 87 return getVPTInstrPredicate(MI, PredReg); 88 } 89 90 // Recomputes the Block Mask of Instr, a VPT or VPST instruction. 91 // This rebuilds the block mask of the instruction depending on the predicates 92 // of the instructions following it. This should only be used after the 93 // MVEVPTBlockInsertion pass has run, and should be used whenever a predicated 94 // instruction is added to/removed from the block. 95 void recomputeVPTBlockMask(MachineInstr &Instr); 96 } // namespace llvm 97 98 #endif 99