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 3709 of file AArch64FrameLowering.cpp.

Constructor & Destructor Documentation

ScopedScavengeOrSpill() [1/3]

ScopedScavengeOrSpill::ScopedScavengeOrSpill ( const ScopedScavengeOrSpill & )

delete

References ScopedScavengeOrSpill().

Referenced by ScopedScavengeOrSpill(), and ScopedScavengeOrSpill().

ScopedScavengeOrSpill() [2/3]

ScopedScavengeOrSpill::ScopedScavengeOrSpill ( ScopedScavengeOrSpill && )

delete

References ScopedScavengeOrSpill().

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 3713 of file AArch64FrameLowering.cpp.

References assert(), const, llvm::MachineFrameInfo::CreateSpillStackObject(), llvm::MachineFunction::getFrameInfo(), Register, and tryScavengeRegister().

~ScopedScavengeOrSpill()

ScopedScavengeOrSpill::~ScopedScavengeOrSpill ( )

inline

Definition at line 3746 of file AArch64FrameLowering.cpp.

References hasSpilled(), and Register.

Member Function Documentation

freeRegister()

Register ScopedScavengeOrSpill::freeRegister ( ) const

inline

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

Definition at line 3742 of file AArch64FrameLowering.cpp.

Referenced by operator*().

hasSpilled()

bool ScopedScavengeOrSpill::hasSpilled ( ) const

inline

Definition at line 3739 of file AArch64FrameLowering.cpp.

Referenced by expandFillPPRFromZPRSlotPseudo(), and ~ScopedScavengeOrSpill().

operator*()

Register ScopedScavengeOrSpill::operator* ( ) const

inline

Definition at line 3744 of file AArch64FrameLowering.cpp.

References freeRegister().

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

• lib/Target/AArch64/AArch64FrameLowering.cpp