ScopedScavengeOrSpill Struct Reference

RAII helper class for scavenging or spilling a register. More...

Public Member Functions
	ScopedScavengeOrSpill (const ScopedScavengeOrSpill &)=delete
	ScopedScavengeOrSpill (ScopedScavengeOrSpill &&)=delete
	ScopedScavengeOrSpill (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, Register SpillCandidate, const TargetRegisterClass &RC, LiveRegUnits const &UsedRegs, BitVector const &AllocatableRegs, std::optional< int > *MaybeSpillFI, Register PreferredReg=AArch64::NoRegister)
bool	hasSpilled () const
Register	freeRegister () const
	Returns the free register (found from scavenging or spilling a register).
Register	operator* () const
	~ScopedScavengeOrSpill ()

Detailed Description

RAII helper class for scavenging or spilling a register.

On construction attempts to find a free register of class RC (given UsedRegs and AllocatableRegs), if no register can be found spills SpillCandidate to MaybeSpillFI to free a register. The free'd register is returned via the FreeReg output parameter. On destruction, if there is a spill, its previous value is reloaded. The spilling and scavenging is only valid at the insertion point MBBI, this class should not be used in places that create or manipulate basic blocks, moving the expected insertion point.

Definition at line 4461 of file AArch64FrameLowering.cpp.

Constructor & Destructor Documentation

ScopedScavengeOrSpill() [1/3]

ScopedScavengeOrSpill::ScopedScavengeOrSpill ( const ScopedScavengeOrSpill &  )

delete

ScopedScavengeOrSpill() [2/3]

ScopedScavengeOrSpill::ScopedScavengeOrSpill ( ScopedScavengeOrSpill &&  )

delete

ScopedScavengeOrSpill() [3/3]

ScopedScavengeOrSpill::ScopedScavengeOrSpill ( MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MBBI, Register  SpillCandidate, const TargetRegisterClass &  RC, LiveRegUnits const &  UsedRegs, BitVector const &  AllocatableRegs, std::optional< int > *  MaybeSpillFI, Register  PreferredReg = AArch64::NoRegister  )

inline

Definition at line 4465 of file AArch64FrameLowering.cpp.

References assert(), llvm::MachineFrameInfo::CreateSpillStackObject(), llvm::MachineFunction::getFrameInfo(), MBB, MBBI, llvm::HexagonInstrInfo::storeRegToStackSlot(), TII, TRI, and tryScavengeRegister().

~ScopedScavengeOrSpill()

ScopedScavengeOrSpill::~ScopedScavengeOrSpill ( )

inline

Definition at line 4498 of file AArch64FrameLowering.cpp.

References llvm::HexagonInstrInfo::loadRegFromStackSlot(), MBB, MBBI, TII, and TRI.

Member Function Documentation

freeRegister()

Register ScopedScavengeOrSpill::freeRegister ( ) const

inline

Returns the free register (found from scavenging or spilling a register).

Definition at line 4494 of file AArch64FrameLowering.cpp.

hasSpilled()

bool ScopedScavengeOrSpill::hasSpilled ( ) const

inline

Definition at line 4491 of file AArch64FrameLowering.cpp.

Referenced by expandFillPPRFromZPRSlotPseudo().

operator*()

Register ScopedScavengeOrSpill::operator* ( ) const

inline

Definition at line 4496 of file AArch64FrameLowering.cpp.

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The documentation for this struct was generated from the following file:

• lib/Target/AArch64/AArch64FrameLowering.cpp