llvm::Rollbacker Class Reference

Rematerializer listener with the ability to re-create deleted registers and rollback rematerializations. More...

#include "llvm/CodeGen/Rematerializer.h"

Inheritance diagram for llvm::Rollbacker:

Public Member Functions
	Rollbacker ()=default
void	rollback (Rematerializer &Remater)
	Re-creates all deleted registers and rolls back all rematerializations that were recorded.
void	rematerializerNoteRegCreated (const Rematerializer &Remater, RegisterIdx RegIdx) override
	Called just after register NewRegIdx is created (following a rematerialization).
void	rematerializerNoteRegWillBeDeleted (const Rematerializer &Remater, RegisterIdx RegIdx) override
	Called just before register RegIdx is deleted from the MIR.
void	rematerializerNoteMIWillBeDeleted (const Rematerializer &Remater, MachineInstr &MI) override
	Called just before unrematerializable instruction MI is deleted from the MIR because it has become a dead definition.
Public Member Functions inherited from llvm::Rematerializer::Listener
virtual	~Listener ()=default

Additional Inherited Members
Public Types inherited from llvm::Rematerializer::Listener
using	RegisterIdx = Rematerializer::RegisterIdx

Detailed Description

Rematerializer listener with the ability to re-create deleted registers and rollback rematerializations.

Starts recording register deletions and rematerializations as soon as it is attached to the rematerializer.

Definition at line 550 of file Rematerializer.h.

Constructor & Destructor Documentation

Rollbacker()

llvm::Rollbacker::Rollbacker ( )

default

References DefMI, getReg(), LLVM_ABI, MI, rematerializerNoteMIWillBeDeleted(), rematerializerNoteRegCreated(), rematerializerNoteRegWillBeDeleted(), and rollback().

Member Function Documentation

rematerializerNoteMIWillBeDeleted()

void Rollbacker::rematerializerNoteMIWillBeDeleted ( const Rematerializer & Remater, MachineInstr & MI )

overridevirtual

Called just before unrematerializable instruction MI is deleted from the MIR because it has become a dead definition.

Reimplemented from llvm::Rematerializer::Listener.

Definition at line 1010 of file Rematerializer.cpp.

References llvm::MachineBasicBlock::end(), and MI.

Referenced by Rollbacker().

rematerializerNoteRegCreated()

void Rollbacker::rematerializerNoteRegCreated ( const Rematerializer & Remater, RegisterIdx NewRegIdx )

overridevirtual

Called just after register NewRegIdx is created (following a rematerialization).

At this point the rematerialization exists in the Remater state and the MIR but does not yet have any user.

Reimplemented from llvm::Rematerializer::Listener.

Definition at line 973 of file Rematerializer.cpp.

References assert(), llvm::Rematerializer::getOriginOf(), and llvm::Rematerializer::isRematerializedRegister().

Referenced by Rollbacker().

rematerializerNoteRegWillBeDeleted()

void Rollbacker::rematerializerNoteRegWillBeDeleted ( const Rematerializer & Remater, RegisterIdx RegIdx )

overridevirtual

Called just before register RegIdx is deleted from the MIR.

At this point the register still exists in the MIR but no longer has any user.

Reimplemented from llvm::Rematerializer::Listener.

Definition at line 981 of file Rematerializer.cpp.

References DefMI, llvm::Rematerializer::Reg::DefMI, llvm::MachineBasicBlock::end(), llvm::Rematerializer::getReg(), and llvm::Rematerializer::isRematerializedRegister().

Referenced by Rollbacker().

rollback()

void Rollbacker::rollback

(

Rematerializer &

Remater

)

Re-creates all deleted registers and rolls back all rematerializations that were recorded.

Definition at line 1024 of file Rematerializer.cpp.

References assert(), llvm::cast(), llvm::dyn_cast(), llvm::Rematerializer::getReg(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::insert(), llvm::Rematerializer::Reg::isAlive(), llvm::Rematerializer::isPermanentlyDead(), llvm_unreachable, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::lookup_or(), MBB, MI, llvm::Rematerializer::recreateReg(), llvm::reverse(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::size(), and llvm::Rematerializer::transferAllUsers().

Referenced by Rollbacker().

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The documentation for this class was generated from the following files:

• include/llvm/CodeGen/Rematerializer.h
• lib/CodeGen/Rematerializer.cpp