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//=- LoongArchFrameLowering.h - TargetFrameLowering for LoongArch -*- 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 class implements LoongArch-specific bits of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
#define LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
#include "llvm/CodeGen/TargetFrameLowering.h"
namespace llvm {
class LoongArchSubtarget;
class LoongArchFrameLowering : public TargetFrameLowering {
const LoongArchSubtarget &STI;
public:
explicit LoongArchFrameLowering(const LoongArchSubtarget &STI)
: TargetFrameLowering(StackGrowsDown,
/*StackAlignment=*/Align(16),
/*LocalAreaOffset=*/0),
STI(STI) {}
void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
RegScavenger *RS) const override;
void processFunctionBeforeFrameFinalized(MachineFunction &MF,
RegScavenger *RS) const override;
bool hasReservedCallFrame(const MachineFunction &MF) const override;
MachineBasicBlock::iterator
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI) const override;
bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
ArrayRef<CalleeSavedInfo> CSI,
const TargetRegisterInfo *TRI) const override;
StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
Register &FrameReg) const override;
bool hasFP(const MachineFunction &MF) const override;
bool hasBP(const MachineFunction &MF) const;
uint64_t getFirstSPAdjustAmount(const MachineFunction &MF,
bool IsPrologue = false) const;
bool enableShrinkWrapping(const MachineFunction &MF) const override;
private:
void determineFrameLayout(MachineFunction &MF) const;
void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
const DebugLoc &DL, Register DestReg, Register SrcReg,
int64_t Val, MachineInstr::MIFlag Flag) const;
};
} // end namespace llvm
#endif // LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
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