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1//===-- M68kRegisterInfo.h - M68k Register Information Impl -----*- 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-exception6//7//===----------------------------------------------------------------------===//8///9/// \file10/// This file contains the M68k implementation of the TargetRegisterInfo11/// class.12///13//===----------------------------------------------------------------------===//14 15#ifndef LLVM_LIB_TARGET_M68K_M68KREGISTERINFO_H16#define LLVM_LIB_TARGET_M68K_M68KREGISTERINFO_H17 18#include "M68k.h"19 20#include "llvm/CodeGen/TargetRegisterInfo.h"21 22#define GET_REGINFO_HEADER23#include "M68kGenRegisterInfo.inc"24 25namespace llvm {26class M68kSubtarget;27class TargetInstrInfo;28class Type;29 30class M68kRegisterInfo : public M68kGenRegisterInfo {31 virtual void anchor();32 33 /// Physical register used as stack ptr.34 unsigned StackPtr;35 36 /// Physical register used as frame ptr.37 unsigned FramePtr;38 39 /// Physical register used as a base ptr in complex stack frames. I.e., when40 /// we need a 3rd base, not just SP and FP, due to variable size stack41 /// objects.42 unsigned BasePtr;43 44 /// Physical register used to store GOT address if needed.45 unsigned GlobalBasePtr;46 47protected:48 const M68kSubtarget &Subtarget;49 50public:51 M68kRegisterInfo(const M68kSubtarget &Subtarget);52 53 const MCPhysReg *getCalleeSavedRegs(const MachineFunction *MF) const override;54 55 const uint32_t *getCallPreservedMask(const MachineFunction &MF,56 CallingConv::ID) const override;57 58 /// Returns a register class with registers that can be used in forming tail59 /// calls.60 const TargetRegisterClass *61 getRegsForTailCall(const MachineFunction &MF) const;62 63 /// Return a mega-register of the specified register Reg so its sub-register64 /// of index SubIdx is Reg, its super(or mega) Reg. In other words it will65 /// return a register that is not direct super register but still shares66 /// physical register with Reg.67 /// NOTE not sure about the term though.68 unsigned getMatchingMegaReg(unsigned Reg,69 const TargetRegisterClass *RC) const;70 71 /// Returns the Register Class of a physical register of the given type,72 /// picking the biggest register class of the right type that contains this73 /// physreg.74 const TargetRegisterClass *getMaximalPhysRegClass(unsigned reg, MVT VT) const;75 76 /// Return index of a register within a register class, otherwise return -177 int getRegisterOrder(unsigned Reg, const TargetRegisterClass &TRC) const;78 79 /// Return spill order index of a register, if there is none then trap80 int getSpillRegisterOrder(unsigned Reg) const;81 82 BitVector getReservedRegs(const MachineFunction &MF) const override;83 84 bool requiresRegisterScavenging(const MachineFunction &MF) const override;85 86 bool trackLivenessAfterRegAlloc(const MachineFunction &MF) const override;87 88 /// FrameIndex represent objects inside a abstract stack. We must replace89 /// FrameIndex with an stack/frame pointer direct reference.90 bool eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,91 unsigned FIOperandNum,92 RegScavenger *RS = nullptr) const override;93 94 bool hasBasePointer(const MachineFunction &MF) const;95 96 /// True if the stack can be realigned for the target.97 bool canRealignStack(const MachineFunction &MF) const override;98 99 Register getFrameRegister(const MachineFunction &MF) const override;100 101 const TargetRegisterClass *102 getCrossCopyRegClass(const TargetRegisterClass *RC) const override {103 if (RC == &M68k::CCRCRegClass)104 return &M68k::DR16RegClass;105 return RC;106 }107 108 unsigned getStackRegister() const { return StackPtr; }109 unsigned getBaseRegister() const { return BasePtr; }110 unsigned getGlobalBaseRegister() const { return GlobalBasePtr; }111 112 const TargetRegisterClass *intRegClass(unsigned Size) const;113};114 115} // end namespace llvm116 117#endif // LLVM_LIB_TARGET_M68K_M68KREGISTERINFO_H118