llvm::mca::RetireControlUnit Struct Reference

This class tracks which instructions are in-flight (i.e., dispatched but not retired) in the OoO backend. More...

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

Inheritance diagram for llvm::mca::RetireControlUnit:

Classes
struct	RUToken

Public Member Functions
	RetireControlUnit (const MCSchedModel &SM)
bool	isEmpty () const
bool	isAvailable (unsigned Quantity=1) const
unsigned	getMaxRetirePerCycle () const
unsigned	dispatch (const InstRef &IS)
const RUToken &	getCurrentToken () const
const RUToken &	peekNextToken () const
void	consumeCurrentToken ()
void	onInstructionExecuted (unsigned TokenID)
void	dump () const
Public Member Functions inherited from llvm::mca::HardwareUnit
	HardwareUnit ()=default
virtual	~HardwareUnit ()

Static Public Attributes
static const unsigned	UnhandledTokenID = ~0U

Detailed Description

This class tracks which instructions are in-flight (i.e., dispatched but not retired) in the OoO backend.

This class checks on every cycle if/which instructions can be retired. Instructions are retired in program order. In the event of an instruction being retired, the pipeline that owns this RetireControlUnit (RCU) gets notified.

On instruction retired, register updates are all architecturally committed, and any physicall registers previously allocated for the retired instruction are freed.

Definition at line 36 of file RetireControlUnit.h.

Constructor & Destructor Documentation

RetireControlUnit()

llvm::mca::RetireControlUnit::RetireControlUnit

(

const MCSchedModel &

SM

)

Definition at line 22 of file RetireControlUnit.cpp.

References assert(), llvm::MCSchedModel::getExtraProcessorInfo(), llvm::MCSchedModel::hasExtraProcessorInfo(), llvm::MCSchedModel::isOutOfOrder(), llvm::MCExtraProcessorInfo::MaxRetirePerCycle, and llvm::MCExtraProcessorInfo::ReorderBufferSize.

Member Function Documentation

consumeCurrentToken()

void llvm::mca::RetireControlUnit::consumeCurrentToken

(

)

Definition at line 77 of file RetireControlUnit.cpp.

References llvm::mca::InstRef::getInstruction(), llvm::mca::RetireControlUnit::RUToken::IR, llvm::mca::RetireControlUnit::RUToken::NumSlots, and llvm::mca::Instruction::retire().

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

dispatch()

unsigned llvm::mca::RetireControlUnit::dispatch

(

const InstRef &

IS

)

Definition at line 43 of file RetireControlUnit.cpp.

References assert(), llvm::mca::InstructionBase::getNumMicroOps(), IR, and UnhandledTokenID.

dump()

void llvm::mca::RetireControlUnit::dump

(

)

const

Definition at line 96 of file RetireControlUnit.cpp.

References llvm::dbgs().

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

getCurrentToken()

const RetireControlUnit::RUToken & llvm::mca::RetireControlUnit::getCurrentToken

(

)

const

Definition at line 58 of file RetireControlUnit.cpp.

References assert(), llvm::mca::InstRef::getInstruction(), and llvm::mca::RetireControlUnit::RUToken::IR.

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

getMaxRetirePerCycle()

unsigned llvm::mca::RetireControlUnit::getMaxRetirePerCycle ( ) const

inline

Definition at line 88 of file RetireControlUnit.h.

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

isAvailable()

bool llvm::mca::RetireControlUnit::isAvailable ( unsigned  Quantity = 1 ) const

inline

Definition at line 84 of file RetireControlUnit.h.

isEmpty()

bool llvm::mca::RetireControlUnit::isEmpty ( ) const

inline

Definition at line 82 of file RetireControlUnit.h.

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

onInstructionExecuted()

void llvm::mca::RetireControlUnit::onInstructionExecuted

(

unsigned

TokenID

)

Definition at line 88 of file RetireControlUnit.cpp.

References assert(), and IR.

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

peekNextToken()

const RetireControlUnit::RUToken & llvm::mca::RetireControlUnit::peekNextToken

(

)

const

Definition at line 73 of file RetireControlUnit.cpp.

Member Data Documentation

UnhandledTokenID

const unsigned llvm::mca::RetireControlUnit::UnhandledTokenID = ~0U

static

Definition at line 109 of file RetireControlUnit.h.

Referenced by dispatch(), and llvm::mca::RetireStage::execute().

---

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

• include/llvm/MCA/HardwareUnits/RetireControlUnit.h
• lib/MCA/HardwareUnits/RetireControlUnit.cpp