RISCVRegisterInfo.h

//===-- RISCVRegisterInfo.h - RISCV Register Information Impl ---*- 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 RISCV implementation of the TargetRegisterInfo class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_RISCV_RISCVREGISTERINFO_H
#define LLVM_LIB_TARGET_RISCV_RISCVREGISTERINFO_H

#include "llvm/CodeGen/TargetRegisterInfo.h"

#define GET_REGINFO_HEADER
#include "RISCVGenRegisterInfo.inc"

namespace llvm {

struct RISCVRegisterInfo : public RISCVGenRegisterInfo {

  RISCVRegisterInfo(unsigned HwMode);

  const uint32_t *getCallPreservedMask(const MachineFunction &MF,
                                       CallingConv::ID) const override;

  const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;

  BitVector getReservedRegs(const MachineFunction &MF) const override;
  bool isAsmClobberable(const MachineFunction &MF,
                        MCRegister PhysReg) const override;

  const uint32_t *getNoPreservedMask() const override;

  bool hasReservedSpillSlot(const MachineFunction &MF, Register Reg,
                            int &FrameIdx) const override;

  // Update DestReg to have the value SrcReg plus an offset.  This is
  // used during frame layout, and we may need to ensure that if we
  // split the offset internally that the DestReg is always aligned,
  // assuming that source reg was.
  void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator II,
                 const DebugLoc &DL, Register DestReg, Register SrcReg,
                 StackOffset Offset, MachineInstr::MIFlag Flag,
                 MaybeAlign RequiredAlign) const;

  bool eliminateFrameIndex(MachineBasicBlock::iterator MI, int SPAdj,
                           unsigned FIOperandNum,
                           RegScavenger *RS = nullptr) const override;

  void lowerVSPILL(MachineBasicBlock::iterator II) const;
  void lowerVRELOAD(MachineBasicBlock::iterator II) const;

  Register getFrameRegister(const MachineFunction &MF) const override;

  bool requiresRegisterScavenging(const MachineFunction &MF) const override {
    return true;
  }

  bool requiresFrameIndexScavenging(const MachineFunction &MF) const override {
    return true;
  }

  const TargetRegisterClass *
  getPointerRegClass(const MachineFunction &MF,
                     unsigned Kind = 0) const override {
    return &RISCV::GPRRegClass;
  }

  const TargetRegisterClass *
  getLargestLegalSuperClass(const TargetRegisterClass *RC,
                            const MachineFunction &) const override;

  void getOffsetOpcodes(const StackOffset &Offset,
                        SmallVectorImpl<uint64_t> &Ops) const override;

  unsigned getRegisterCostTableIndex(const MachineFunction &MF) const override;

  bool getRegAllocationHints(Register VirtReg, ArrayRef<MCPhysReg> Order,
                             SmallVectorImpl<MCPhysReg> &Hints,
                             const MachineFunction &MF, const VirtRegMap *VRM,
                             const LiveRegMatrix *Matrix) const override;
};
}

#endif