SIFrameLowering.h

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//===--------------------- SIFrameLowering.h --------------------*- 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
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIB_TARGET_AMDGPU_SIFRAMELOWERING_H
#define LLVM_LIB_TARGET_AMDGPU_SIFRAMELOWERING_H

#include "AMDGPUFrameLowering.h"

namespace llvm {

class SIInstrInfo;
class SIMachineFunctionInfo;
class SIRegisterInfo;
class GCNSubtarget;

class SIFrameLowering final : public AMDGPUFrameLowering {
public:
  SIFrameLowering(StackDirection D, unsigned StackAl, int LAO,
                  unsigned TransAl = 1) :
    AMDGPUFrameLowering(D, StackAl, LAO, TransAl) {}
  ~SIFrameLowering() override = default;

  void emitEntryFunctionPrologue(MachineFunction &MF,
                                 MachineBasicBlock &MBB) const;
  void emitPrologue(MachineFunction &MF,
                    MachineBasicBlock &MBB) const override;
  void emitEpilogue(MachineFunction &MF,
                    MachineBasicBlock &MBB) const override;
  int getFrameIndexReference(const MachineFunction &MF, int FI,
                             unsigned &FrameReg) const override;

  void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
                            RegScavenger *RS = nullptr) const override;
  void determineCalleeSavesSGPR(MachineFunction &MF, BitVector &SavedRegs,
                                RegScavenger *RS = nullptr) const;
  bool
  assignCalleeSavedSpillSlots(MachineFunction &MF,
                              const TargetRegisterInfo *TRI,
                              std::vector<CalleeSavedInfo> &CSI) const override;

  bool isSupportedStackID(TargetStackID::Value ID) const override;

  void processFunctionBeforeFrameFinalized(
    MachineFunction &MF,
    RegScavenger *RS = nullptr) const override;

  MachineBasicBlock::iterator
  eliminateCallFramePseudoInstr(MachineFunction &MF,
                                MachineBasicBlock &MBB,
                                MachineBasicBlock::iterator MI) const override;

private:
  void emitFlatScratchInit(const GCNSubtarget &ST,
                           MachineFunction &MF,
                           MachineBasicBlock &MBB) const;

  unsigned getReservedPrivateSegmentBufferReg(
    const GCNSubtarget &ST,
    const SIInstrInfo *TII,
    const SIRegisterInfo *TRI,
    SIMachineFunctionInfo *MFI,
    MachineFunction &MF) const;

  std::pair<unsigned, bool> getReservedPrivateSegmentWaveByteOffsetReg(
      const GCNSubtarget &ST, const SIInstrInfo *TII, const SIRegisterInfo *TRI,
      SIMachineFunctionInfo *MFI, MachineFunction &MF) const;

  // Emit scratch setup code for AMDPAL or Mesa, assuming ResourceRegUsed is set.
  void emitEntryFunctionScratchSetup(const GCNSubtarget &ST, MachineFunction &MF,
      MachineBasicBlock &MBB, SIMachineFunctionInfo *MFI,
      MachineBasicBlock::iterator I, unsigned PreloadedPrivateBufferReg,
      unsigned ScratchRsrcReg) const;

public:
  bool hasFP(const MachineFunction &MF) const override;
};

} // end namespace llvm

#endif // LLVM_LIB_TARGET_AMDGPU_SIFRAMELOWERING_H