LLVM 20.0.0git
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llvm::mca::RegisterFile Class Reference

Manages hardware register files, and tracks register definitions for register renaming purposes. More...

#include "llvm/MCA/HardwareUnits/RegisterFile.h"

Inheritance diagram for llvm::mca::RegisterFile:
Inheritance graph
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Classes

struct  RAWHazard
 

Public Member Functions

 RegisterFile (const MCSchedModel &SM, const MCRegisterInfo &mri, unsigned NumRegs=0)
 
void collectWrites (const MCSubtargetInfo &STI, const ReadState &RS, SmallVectorImpl< WriteRef > &Writes, SmallVectorImpl< WriteRef > &CommittedWrites) const
 
RAWHazard checkRAWHazards (const MCSubtargetInfo &STI, const ReadState &RS) const
 
void addRegisterWrite (WriteRef Write, MutableArrayRef< unsigned > UsedPhysRegs)
 
void addRegisterRead (ReadState &RS, const MCSubtargetInfo &STI) const
 
void removeRegisterWrite (const WriteState &WS, MutableArrayRef< unsigned > FreedPhysRegs)
 
bool canEliminateMove (const WriteState &WS, const ReadState &RS, unsigned PRFIndex) const
 
bool tryEliminateMoveOrSwap (MutableArrayRef< WriteState > Writes, MutableArrayRef< ReadState > Reads)
 
unsigned isAvailable (ArrayRef< MCPhysReg > Regs) const
 
unsigned getNumRegisterFiles () const
 
unsigned getElapsedCyclesFromWriteBack (const WriteRef &WR) const
 
void onInstructionExecuted (Instruction *IS)
 
void cycleStart ()
 
void cycleEnd ()
 
void dump () const
 
- Public Member Functions inherited from llvm::mca::HardwareUnit
 HardwareUnit ()=default
 
virtual ~HardwareUnit ()
 

Detailed Description

Manages hardware register files, and tracks register definitions for register renaming purposes.

Definition at line 83 of file RegisterFile.h.

Constructor & Destructor Documentation

◆ RegisterFile()

llvm::mca::RegisterFile::RegisterFile ( const MCSchedModel &  SM,
const MCRegisterInfo &  mri,
unsigned  NumRegs = 0 
)

Definition at line 64 of file RegisterFile.cpp.

Member Function Documentation

◆ addRegisterRead()

void llvm::mca::RegisterFile::addRegisterRead ( ReadState &  RS,
const MCSubtargetInfo &  STI 
) const

Definition at line 618 of file RegisterFile.cpp.

References llvm::mca::WriteState::addUser(), assert(), collectWrites(), llvm::mca::ReadState::getDescriptor(), getElapsedCyclesFromWriteBack(), llvm::MCSubtargetInfo::getReadAdvanceCycles(), llvm::mca::ReadState::getRegisterID(), llvm::MCSchedModel::getSchedClassDesc(), llvm::MCSubtargetInfo::getSchedModel(), llvm::mca::ReadState::isIndependentFromDef(), llvm::mca::ReadDescriptor::SchedClassID, llvm::mca::ReadState::setDependentWrites(), llvm::mca::ReadState::setPRF(), llvm::mca::ReadState::setReadZero(), llvm::SmallVectorBase< Size_T >::size(), llvm::mca::ReadDescriptor::UseIndex, and llvm::mca::ReadState::writeStartEvent().

Referenced by llvm::mca::addRegisterReadWrite().

◆ addRegisterWrite()

void llvm::mca::RegisterFile::addRegisterWrite ( WriteRef  Write,
MutableArrayRef< unsigned >  UsedPhysRegs 
)

Definition at line 228 of file RegisterFile.cpp.

References llvm::mca::WriteState::addUser(), assert(), llvm::mca::WriteState::clearsSuperRegisters(), llvm::dbgs(), llvm::mca::WriteState::getLatency(), llvm::MCRegisterInfo::getName(), llvm::mca::WriteState::getRegisterID(), llvm::mca::WriteRef::getSourceIndex(), llvm::mca::WriteRef::getWriteState(), I, llvm::mca::WriteState::isEliminated(), llvm::mca::WriteState::isWriteZero(), LLVM_DEBUG, llvm::APInt::setBitVal(), llvm::mca::WriteState::setPRF(), llvm::MCRegisterInfo::subregs(), llvm::MCRegisterInfo::superregs(), and llvm::Write.

Referenced by llvm::mca::addRegisterReadWrite().

◆ canEliminateMove()

bool llvm::mca::RegisterFile::canEliminateMove ( const WriteState &  WS,
const ReadState &  RS,
unsigned  PRFIndex 
) const

Definition at line 384 of file RegisterFile.cpp.

References llvm::mca::WriteState::clearsSuperRegisters(), llvm::mca::WriteState::getRegisterID(), and llvm::mca::ReadState::getRegisterID().

Referenced by tryEliminateMoveOrSwap().

◆ checkRAWHazards()

RegisterFile::RAWHazard llvm::mca::RegisterFile::checkRAWHazards ( const MCSubtargetInfo &  STI,
const ReadState &  RS 
) const

Definition at line 568 of file RegisterFile.cpp.

References assert(), llvm::SmallVectorImpl< T >::clear(), collectWrites(), llvm::mca::RegisterFile::RAWHazard::CyclesLeft, llvm::mca::WriteState::getCyclesLeft(), llvm::mca::ReadState::getDescriptor(), getElapsedCyclesFromWriteBack(), llvm::MCSubtargetInfo::getReadAdvanceCycles(), llvm::MCSchedModel::getSchedClassDesc(), llvm::MCSubtargetInfo::getSchedModel(), llvm::mca::WriteState::getWriteResourceID(), llvm::mca::RegisterFile::RAWHazard::isValid(), llvm::mca::RegisterFile::RAWHazard::RegisterID, llvm::mca::ReadDescriptor::SchedClassID, llvm::mca::UNKNOWN_CYCLES, llvm::mca::ReadDescriptor::UseIndex, and Writes.

Referenced by llvm::mca::checkRegisterHazard().

◆ collectWrites()

void llvm::mca::RegisterFile::collectWrites ( const MCSubtargetInfo &  STI,
const ReadState &  RS,
SmallVectorImpl< WriteRef > &  Writes,
SmallVectorImpl< WriteRef > &  CommittedWrites 
) const

Definition at line 502 of file RegisterFile.cpp.

References assert(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::dbgs(), llvm::mca::ReadState::getDescriptor(), getElapsedCyclesFromWriteBack(), llvm::MCRegisterInfo::getName(), llvm::MCSubtargetInfo::getReadAdvanceCycles(), llvm::mca::WriteState::getRegisterID(), llvm::mca::ReadState::getRegisterID(), llvm::MCSchedModel::getSchedClassDesc(), llvm::MCSubtargetInfo::getSchedModel(), llvm::mca::WriteRef::getSourceIndex(), llvm::mca::WriteRef::getWriteResourceID(), llvm::mca::WriteRef::getWriteState(), llvm::mca::WriteRef::hasKnownWriteBackCycle(), I, LLVM_DEBUG, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorImpl< T >::resize(), llvm::mca::ReadDescriptor::SchedClassID, llvm::SmallVectorBase< Size_T >::size(), llvm::sort(), llvm::MCRegisterInfo::subregs(), llvm::unique(), llvm::mca::ReadDescriptor::UseIndex, and Writes.

Referenced by addRegisterRead(), and checkRAWHazards().

◆ cycleEnd()

void llvm::mca::RegisterFile::cycleEnd ( )
inline

Definition at line 302 of file RegisterFile.h.

Referenced by llvm::mca::InOrderIssueStage::cycleEnd(), and llvm::mca::RetireStage::cycleEnd().

◆ cycleStart()

void llvm::mca::RegisterFile::cycleStart ( )

Definition at line 100 of file RegisterFile.cpp.

Referenced by llvm::mca::InOrderIssueStage::cycleStart(), and llvm::mca::RetireStage::cycleStart().

◆ dump()

void llvm::mca::RegisterFile::dump ( ) const

Definition at line 717 of file RegisterFile.cpp.

References llvm::dbgs(), E, llvm::MCRegisterInfo::getName(), getNumRegisterFiles(), llvm::MCRegisterInfo::getNumRegs(), and I.

Referenced by llvm::mca::DispatchStage::dump().

◆ getElapsedCyclesFromWriteBack()

unsigned llvm::mca::RegisterFile::getElapsedCyclesFromWriteBack ( const WriteRef &  WR) const

Definition at line 497 of file RegisterFile.cpp.

References assert(), llvm::mca::WriteRef::getWriteBackCycle(), and llvm::mca::WriteRef::hasKnownWriteBackCycle().

Referenced by addRegisterRead(), checkRAWHazards(), and collectWrites().

◆ getNumRegisterFiles()

unsigned llvm::mca::RegisterFile::getNumRegisterFiles ( ) const
inline

Definition at line 293 of file RegisterFile.h.

References llvm::SmallVectorBase< Size_T >::size().

Referenced by llvm::mca::DispatchStage::cycleStart(), dump(), isAvailable(), and llvm::mca::RetireStage::notifyInstructionRetired().

◆ isAvailable()

unsigned llvm::mca::RegisterFile::isAvailable ( ArrayRef< MCPhysReg >  Regs) const

Definition at line 660 of file RegisterFile.cpp.

References llvm::dbgs(), E, getNumRegisterFiles(), I, and LLVM_DEBUG.

◆ onInstructionExecuted()

void llvm::mca::RegisterFile::onInstructionExecuted ( Instruction *  IS)

Definition at line 105 of file RegisterFile.cpp.

References assert(), llvm::mca::InstructionBase::getDefs(), llvm::mca::WriteRef::getWriteState(), I, llvm::mca::Instruction::isExecuted(), llvm::mca::WriteRef::notifyExecuted(), llvm::MCRegisterInfo::subregs(), llvm::MCRegisterInfo::superregs(), and llvm::mca::UNKNOWN_CYCLES.

Referenced by llvm::mca::RetireStage::execute().

◆ removeRegisterWrite()

void llvm::mca::RegisterFile::removeRegisterWrite ( const WriteState &  WS,
MutableArrayRef< unsigned >  FreedPhysRegs 
)

Definition at line 332 of file RegisterFile.cpp.

References assert(), llvm::mca::WriteState::clearsSuperRegisters(), llvm::mca::WriteRef::commit(), llvm::mca::WriteState::getCyclesLeft(), llvm::mca::WriteState::getRegisterID(), llvm::mca::WriteRef::getWriteState(), I, llvm::mca::WriteState::isEliminated(), llvm::mca::WriteState::isWriteZero(), llvm::MCRegisterInfo::subregs(), llvm::MCRegisterInfo::superregs(), and llvm::mca::UNKNOWN_CYCLES.

Referenced by llvm::mca::RetireStage::notifyInstructionRetired().

◆ tryEliminateMoveOrSwap()

bool llvm::mca::RegisterFile::tryEliminateMoveOrSwap ( MutableArrayRef< WriteState >  Writes,
MutableArrayRef< ReadState >  Reads 
)

Definition at line 426 of file RegisterFile.cpp.

References canEliminateMove(), E, llvm::SmallVectorBase< Size_T >::empty(), llvm::mca::WriteState::getRegisterID(), llvm::mca::ReadState::getRegisterID(), I, if(), llvm::mca::WriteState::setEliminated(), llvm::mca::ReadState::setReadZero(), llvm::mca::WriteState::setWriteZero(), llvm::ArrayRef< T >::size(), llvm::SmallVectorBase< Size_T >::size(), llvm::MCRegisterInfo::subregs(), and Writes.

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