MipsSEInstrInfo.h

//===-- MipsSEInstrInfo.h - Mips32/64 Instruction Information ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the Mips32/64 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_MIPS_MIPSSEINSTRINFO_H
#define LLVM_LIB_TARGET_MIPS_MIPSSEINSTRINFO_H

#include "MipsInstrInfo.h"
#include "MipsSERegisterInfo.h"

namespace llvm {

class MipsSEInstrInfo : public MipsInstrInfo {
  const MipsSERegisterInfo RI;

public:
  explicit MipsSEInstrInfo(const MipsSubtarget &STI);

  const MipsRegisterInfo &getRegisterInfo() const override;

  /// isLoadFromStackSlot - If the specified machine instruction is a direct
  /// load from a stack slot, return the virtual or physical register number of
  /// the destination along with the FrameIndex of the loaded stack slot.  If
  /// not, return 0.  This predicate must return 0 if the instruction has
  /// any side effects other than loading from the stack slot.
  unsigned isLoadFromStackSlot(const MachineInstr &MI,
                               int &FrameIndex) const override;

  /// isStoreToStackSlot - If the specified machine instruction is a direct
  /// store to a stack slot, return the virtual or physical register number of
  /// the source reg along with the FrameIndex of the loaded stack slot.  If
  /// not, return 0.  This predicate must return 0 if the instruction has
  /// any side effects other than storing to the stack slot.
  unsigned isStoreToStackSlot(const MachineInstr &MI,
                              int &FrameIndex) const override;

  void copyPhysReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
                   const DebugLoc &DL, MCRegister DestReg, MCRegister SrcReg,
                   bool KillSrc) const override;

  void storeRegToStack(MachineBasicBlock &MBB,
                       MachineBasicBlock::iterator MI,
                       Register SrcReg, bool isKill, int FrameIndex,
                       const TargetRegisterClass *RC,
                       const TargetRegisterInfo *TRI,
                       int64_t Offset) const override;

  void loadRegFromStack(MachineBasicBlock &MBB,
                        MachineBasicBlock::iterator MI,
                        Register DestReg, int FrameIndex,
                        const TargetRegisterClass *RC,
                        const TargetRegisterInfo *TRI,
                        int64_t Offset) const override;

  bool expandPostRAPseudo(MachineInstr &MI) const override;

  bool isBranchWithImm(unsigned Opc) const override;

  unsigned getOppositeBranchOpc(unsigned Opc) const override;

  /// Adjust SP by Amount bytes.
  void adjustStackPtr(unsigned SP, int64_t Amount, MachineBasicBlock &MBB,
                      MachineBasicBlock::iterator I) const override;

  /// Emit a series of instructions to load an immediate. If NewImm is a
  /// non-NULL parameter, the last instruction is not emitted, but instead
  /// its immediate operand is returned in NewImm.
  unsigned loadImmediate(int64_t Imm, MachineBasicBlock &MBB,
                         MachineBasicBlock::iterator II, const DebugLoc &DL,
                         unsigned *NewImm) const;

protected:
  /// If the specific machine instruction is a instruction that moves/copies
  /// value from one register to another register return destination and source
  /// registers as machine operands.
  Optional<DestSourcePair>
  isCopyInstrImpl(const MachineInstr &MI) const override;

private:
  unsigned getAnalyzableBrOpc(unsigned Opc) const override;

  void expandRetRA(MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const;

  void expandERet(MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const;

  std::pair<bool, bool> compareOpndSize(unsigned Opc,
                                        const MachineFunction &MF) const;

  void expandPseudoMFHiLo(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
                          unsigned NewOpc) const;

  void expandPseudoMTLoHi(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
                          unsigned LoOpc, unsigned HiOpc,
                          bool HasExplicitDef) const;

  /// Expand pseudo Int-to-FP conversion instructions.
  ///
  /// For example, the following pseudo instruction
  ///  PseudoCVT_D32_W D2, A5
  /// gets expanded into these two instructions:
  ///  MTC1 F4, A5
  ///  CVT_D32_W D2, F4
  ///
  /// We do this expansion post-RA to avoid inserting a floating point copy
  /// instruction between MTC1 and CVT_D32_W.
  void expandCvtFPInt(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
                      unsigned CvtOpc, unsigned MovOpc, bool IsI64) const;

  void expandExtractElementF64(MachineBasicBlock &MBB,
                               MachineBasicBlock::iterator I, bool isMicroMips,
                               bool FP64) const;
  void expandBuildPairF64(MachineBasicBlock &MBB,
                          MachineBasicBlock::iterator I, bool isMicroMips,
                          bool FP64) const;
  void expandEhReturn(MachineBasicBlock &MBB,
                      MachineBasicBlock::iterator I) const;
};

}

#endif