llvm::CombinerHelper Class Reference

#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"

Public Member Functions
	CombinerHelper (GISelChangeObserver &Observer, MachineIRBuilder &B)
void	replaceRegWith (MachineRegisterInfo &MRI, unsigned FromReg, unsigned ToReg) const
	MachineRegisterInfo::replaceRegWith() and inform the observer of the changes. More...
void	replaceRegOpWith (MachineRegisterInfo &MRI, MachineOperand &FromRegOp, unsigned ToReg) const
	Replace a single register operand with a new register and inform the observer of the changes. More...
bool	tryCombineCopy (MachineInstr &MI)
	If MI is COPY, try to combine it. More...
bool	tryCombineExtendingLoads (MachineInstr &MI)
	If MI is extend that consumes the result of a load, try to combine it. More...
bool	tryCombine (MachineInstr &MI)
	Try to transform MI by using all of the above combine functions. More...

Detailed Description

Definition at line 29 of file CombinerHelper.h.

Constructor & Destructor Documentation

CombinerHelper()

CombinerHelper::CombinerHelper	(	GISelChangeObserver &	Observer,
		MachineIRBuilder &	B
	)

Definition at line 22 of file CombinerHelper.cpp.

Member Function Documentation

replaceRegOpWith()

void CombinerHelper::replaceRegOpWith	(	MachineRegisterInfo &	MRI,
		MachineOperand &	FromRegOp,
		unsigned	ToReg
	)		const

Replace a single register operand with a new register and inform the observer of the changes.

Definition at line 38 of file CombinerHelper.cpp.

References assert(), llvm::GISelChangeObserver::changedInstr(), llvm::GISelChangeObserver::changingInstr(), llvm::MachineOperand::getParent(), and llvm::MachineOperand::setReg().

Referenced by tryCombineExtendingLoads().

replaceRegWith()

void CombinerHelper::replaceRegWith	(	MachineRegisterInfo &	MRI,
		unsigned	FromReg,
		unsigned	ToReg
	)		const

MachineRegisterInfo::replaceRegWith() and inform the observer of the changes.

Definition at line 26 of file CombinerHelper.cpp.

References llvm::MachineIRBuilder::buildCopy(), llvm::GISelChangeObserver::changingAllUsesOfReg(), llvm::MachineRegisterInfo::constrainRegAttrs(), llvm::GISelChangeObserver::finishedChangingAllUsesOfReg(), and llvm::MachineRegisterInfo::replaceRegWith().

Referenced by tryCombineCopy(), and tryCombineExtendingLoads().

tryCombine()

bool CombinerHelper::tryCombine

(

MachineInstr &

MI

)

Try to transform MI by using all of the above combine functions.

Returns true if changed.

Definition at line 331 of file CombinerHelper.cpp.

References tryCombineCopy(), and tryCombineExtendingLoads().

tryCombineCopy()

bool CombinerHelper::tryCombineCopy

(

MachineInstr &

MI

)

If MI is COPY, try to combine it.

Returns true if MI changed.

Definition at line 49 of file CombinerHelper.cpp.

References DefMI, llvm::MachineInstr::eraseFromParent(), function, llvm::MachineBasicBlock::getFirstNonPHI(), llvm::MachineOperand::getMBB(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), llvm::MachineOperand::getParent(), llvm::MachineInstr::getParent(), llvm::MachineOperand::getReg(), llvm::LLT::getSizeInBits(), llvm::MachineRegisterInfo::getType(), llvm::MachineInstr::isPHI(), llvm::LLT::isValid(), MI, replaceRegWith(), and UseMI.

Referenced by tryCombine().

tryCombineExtendingLoads()

bool CombinerHelper::tryCombineExtendingLoads

(

MachineInstr &

MI

)

If MI is extend that consumes the result of a load, try to combine it.

Returns true if MI changed.

rewrites to:

rewrites to:

Definition at line 155 of file CombinerHelper.cpp.

References assert(), llvm::dbgs(), llvm::SmallVectorImpl< T >::emplace_back(), llvm::MachineInstr::getOpcode(), llvm::MachineInstr::getOperand(), llvm::MachineOperand::getParent(), llvm::MachineOperand::getReg(), llvm::LLT::getSizeInBits(), LLVM_DEBUG, MRI, llvm::SmallVectorTemplateBase< T >::push_back(), replaceRegOpWith(), replaceRegWith(), llvm::MachineInstr::setDesc(), llvm::MachineOperand::setReg(), and UseMI.

Referenced by tryCombine().

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

• include/llvm/CodeGen/GlobalISel/CombinerHelper.h
• lib/CodeGen/GlobalISel/CombinerHelper.cpp