1 //===- Mips16InstrInfo.h - Mips16 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 Mips16 implementation of the TargetInstrInfo class. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #ifndef LLVM_LIB_TARGET_MIPS_MIPS16INSTRINFO_H 14 #define LLVM_LIB_TARGET_MIPS_MIPS16INSTRINFO_H 15 16 #include "Mips16RegisterInfo.h" 17 #include "MipsInstrInfo.h" 18 #include "llvm/CodeGen/MachineBasicBlock.h" 19 #include "llvm/Support/MathExtras.h" 20 #include <cstdint> 21 22 namespace llvm { 23 24 class MCInstrDesc; 25 class MipsSubtarget; 26 27 class Mips16InstrInfo : public MipsInstrInfo { 28 const Mips16RegisterInfo RI; 29 30 public: 31 explicit Mips16InstrInfo(const MipsSubtarget &STI); 32 33 const MipsRegisterInfo &getRegisterInfo() const override; 34 35 /// isLoadFromStackSlot - If the specified machine instruction is a direct 36 /// load from a stack slot, return the virtual or physical register number of 37 /// the destination along with the FrameIndex of the loaded stack slot. If 38 /// not, return 0. This predicate must return 0 if the instruction has 39 /// any side effects other than loading from the stack slot. 40 unsigned isLoadFromStackSlot(const MachineInstr &MI, 41 int &FrameIndex) const override; 42 43 /// isStoreToStackSlot - If the specified machine instruction is a direct 44 /// store to a stack slot, return the virtual or physical register number of 45 /// the source reg along with the FrameIndex of the loaded stack slot. If 46 /// not, return 0. This predicate must return 0 if the instruction has 47 /// any side effects other than storing to the stack slot. 48 unsigned isStoreToStackSlot(const MachineInstr &MI, 49 int &FrameIndex) const override; 50 51 void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, 52 const DebugLoc &DL, MCRegister DestReg, MCRegister SrcReg, 53 bool KillSrc) const override; 54 55 void storeRegToStack(MachineBasicBlock &MBB, 56 MachineBasicBlock::iterator MBBI, 57 Register SrcReg, bool isKill, int FrameIndex, 58 const TargetRegisterClass *RC, 59 const TargetRegisterInfo *TRI, 60 int64_t Offset) const override; 61 62 void loadRegFromStack(MachineBasicBlock &MBB, 63 MachineBasicBlock::iterator MBBI, 64 Register DestReg, int FrameIndex, 65 const TargetRegisterClass *RC, 66 const TargetRegisterInfo *TRI, 67 int64_t Offset) const override; 68 69 bool expandPostRAPseudo(MachineInstr &MI) const override; 70 71 unsigned getOppositeBranchOpc(unsigned Opc) const override; 72 73 // Adjust SP by FrameSize bytes. Save RA, S0, S1 74 void makeFrame(unsigned SP, int64_t FrameSize, MachineBasicBlock &MBB, 75 MachineBasicBlock::iterator I) const; 76 77 // Adjust SP by FrameSize bytes. Restore RA, S0, S1 78 void restoreFrame(unsigned SP, int64_t FrameSize, MachineBasicBlock &MBB, 79 MachineBasicBlock::iterator I) const; 80 81 /// Adjust SP by Amount bytes. 82 void adjustStackPtr(unsigned SP, int64_t Amount, MachineBasicBlock &MBB, 83 MachineBasicBlock::iterator I) const override; 84 85 /// Emit a series of instructions to load an immediate. 86 // This is to adjust some FrameReg. We return the new register to be used 87 // in place of FrameReg and the adjusted immediate field (&NewImm) 88 unsigned loadImmediate(unsigned FrameReg, int64_t Imm, MachineBasicBlock &MBB, 89 MachineBasicBlock::iterator II, const DebugLoc &DL, 90 unsigned &NewImm) const; 91 92 static bool validImmediate(unsigned Opcode, unsigned Reg, int64_t Amount); 93 94 static bool validSpImm8(int offset) { 95 return ((offset & 7) == 0) && isInt<11>(offset); 96 } 97 98 // build the proper one based on the Imm field 99 100 const MCInstrDesc& AddiuSpImm(int64_t Imm) const; 101 102 void BuildAddiuSpImm 103 (MachineBasicBlock &MBB, MachineBasicBlock::iterator I, int64_t Imm) const; 104 105 protected: 106 /// If the specific machine instruction is a instruction that moves/copies 107 /// value from one register to another register return destination and source 108 /// registers as machine operands. 109 std::optional<DestSourcePair> 110 isCopyInstrImpl(const MachineInstr &MI) const override; 111 112 private: 113 unsigned getAnalyzableBrOpc(unsigned Opc) const override; 114 115 void ExpandRetRA16(MachineBasicBlock &MBB, MachineBasicBlock::iterator I, 116 unsigned Opc) const; 117 118 // Adjust SP by Amount bytes where bytes can be up to 32bit number. 119 void adjustStackPtrBig(unsigned SP, int64_t Amount, MachineBasicBlock &MBB, 120 MachineBasicBlock::iterator I, 121 unsigned Reg1, unsigned Reg2) const; 122 123 // Adjust SP by Amount bytes where bytes can be up to 32bit number. 124 void adjustStackPtrBigUnrestricted(unsigned SP, int64_t Amount, 125 MachineBasicBlock &MBB, 126 MachineBasicBlock::iterator I) const; 127 }; 128 129 } // end namespace llvm 130 131 #endif // LLVM_LIB_TARGET_MIPS_MIPS16INSTRINFO_H 132