MachineLICM.cpp File Reference

#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSchedule.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/InitializePasses.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCRegister.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <limits>
#include <vector>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "machinelicm"

Enumerations
enum class	UseBFI { None , PGO , All }

Functions
	STATISTIC (NumHoisted, "Number of machine instructions hoisted out of loops")
	STATISTIC (NumLowRP, "Number of instructions hoisted in low reg pressure situation")
	STATISTIC (NumHighLatency, "Number of high latency instructions hoisted")
	STATISTIC (NumCSEed, "Number of hoisted machine instructions CSEed")
	STATISTIC (NumPostRAHoisted, "Number of machine instructions hoisted out of loops post regalloc")
	STATISTIC (NumStoreConst, "Number of stores of const phys reg hoisted out of loops")
	STATISTIC (NumNotHoistedDueToHotness, "Number of instructions not hoisted due to block frequency")
	INITIALIZE_PASS_BEGIN (MachineLICM, DEBUG_TYPE, "Machine Loop Invariant Code Motion", false, false) INITIALIZE_PASS_END(MachineLICM
Machine Loop Invariant Code false	INITIALIZE_PASS_BEGIN (EarlyMachineLICM, "early-machinelicm", "Early Machine Loop Invariant Code Motion", false, false) INITIALIZE_PASS_END(EarlyMachineLICM
static bool	InstructionStoresToFI (const MachineInstr *MI, int FI)
	Return true if instruction stores to the specified frame.
static bool	isOperandKill (const MachineOperand &MO, MachineRegisterInfo *MRI)
static bool	mayLoadFromGOTOrConstantPool (MachineInstr &MI)
	Return true if this machine instruction loads from global offset table or constant pool.
static bool	isInvariantStore (const MachineInstr &MI, const TargetRegisterInfo *TRI, const MachineRegisterInfo *MRI)
static bool	isCopyFeedingInvariantStore (const MachineInstr &MI, const MachineRegisterInfo *MRI, const TargetRegisterInfo *TRI)

Variables
static cl::opt< bool >	AvoidSpeculation ("avoid-speculation", cl::desc("MachineLICM should avoid speculation"), cl::init(true), cl::Hidden)
static cl::opt< bool >	HoistCheapInsts ("hoist-cheap-insts", cl::desc("MachineLICM should hoist even cheap instructions"), cl::init(false), cl::Hidden)
static cl::opt< bool >	HoistConstStores ("hoist-const-stores", cl::desc("Hoist invariant stores"), cl::init(true), cl::Hidden)
static cl::opt< bool >	HoistConstLoads ("hoist-const-loads", cl::desc("Hoist invariant loads"), cl::init(true), cl::Hidden)
static cl::opt< unsigned >	BlockFrequencyRatioThreshold ("block-freq-ratio-threshold", cl::desc("Do not hoist instructions if target" "block is N times hotter than the source."), cl::init(100), cl::Hidden)
static cl::opt< UseBFI >	DisableHoistingToHotterBlocks ("disable-hoisting-to-hotter-blocks", cl::desc("Disable hoisting instructions to" " hotter blocks"), cl::init(UseBFI::PGO), cl::Hidden, cl::values(clEnumValN(UseBFI::None, "none", "disable the feature"), clEnumValN(UseBFI::PGO, "pgo", "enable the feature when using profile data"), clEnumValN(UseBFI::All, "all", "enable the feature with/wo profile data")))
	DEBUG_TYPE
Machine Loop Invariant Code	Motion
Machine Loop Invariant Code	false
Machine Loop Invariant Code false early	machinelicm

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "machinelicm"

Definition at line 59 of file MachineLICM.cpp.

Enumeration Type Documentation

UseBFI

enum class UseBFI

strong

Enumerator
None
PGO
All

Definition at line 88 of file MachineLICM.cpp.

Function Documentation

INITIALIZE_PASS_BEGIN() [1/2]

Machine Loop Invariant Code false INITIALIZE_PASS_BEGIN	(	EarlyMachineLICM	,
		"early-machinelicm"	,
		"Early Machine Loop Invariant Code Motion"	,
		false	,
		false
	)

INITIALIZE_PASS_BEGIN() [2/2]

INITIALIZE_PASS_BEGIN	(	MachineLICM	,
		DEBUG_TYPE	,
		"Machine Loop Invariant Code Motion"	,
		false	,
		false
	)

InstructionStoresToFI()

static bool InstructionStoresToFI ( const MachineInstr *  MI, int  FI  )

static

Return true if instruction stores to the specified frame.

Definition at line 405 of file MachineLICM.cpp.

References MI.

isCopyFeedingInvariantStore()

static bool isCopyFeedingInvariantStore ( const MachineInstr &  MI, const MachineRegisterInfo *  MRI, const TargetRegisterInfo *  TRI  )

static

Definition at line 975 of file MachineLICM.cpp.

References llvm::Register::asMCReg(), assert(), isInvariantStore(), llvm::Register::isVirtual(), MI, MRI, TRI, and UseMI.

isInvariantStore()

static bool isInvariantStore ( const MachineInstr &  MI, const TargetRegisterInfo *  TRI, const MachineRegisterInfo *  MRI  )

static

Definition at line 941 of file MachineLICM.cpp.

References llvm::MachineOperand::getReg(), llvm::MachineOperand::isImm(), llvm::MachineOperand::isReg(), MI, MRI, and TRI.

Referenced by isCopyFeedingInvariantStore().

isOperandKill()

static bool isOperandKill ( const MachineOperand &  MO, MachineRegisterInfo *  MRI  )

static

Definition at line 829 of file MachineLICM.cpp.

References llvm::MachineOperand::getReg(), llvm::MachineOperand::isKill(), and MRI.

mayLoadFromGOTOrConstantPool()

static bool mayLoadFromGOTOrConstantPool ( MachineInstr &  MI )

static

Return true if this machine instruction loads from global offset table or constant pool.

Definition at line 918 of file MachineLICM.cpp.

References assert(), and MI.

STATISTIC() [1/7]

STATISTIC	(	NumCSEed	,
		"Number of hoisted machine instructions CSEed"
	)

STATISTIC() [2/7]

STATISTIC	(	NumHighLatency	,
		"Number of high latency instructions hoisted"
	)

STATISTIC() [3/7]

STATISTIC	(	NumHoisted	,
		"Number of machine instructions hoisted out of loops"
	)

STATISTIC() [4/7]

STATISTIC	(	NumLowRP	,
		"Number of instructions hoisted in low reg pressure situation"
	)

STATISTIC() [5/7]

STATISTIC	(	NumNotHoistedDueToHotness	,
		"Number of instructions not hoisted due to block frequency"
	)

STATISTIC() [6/7]

STATISTIC	(	NumPostRAHoisted	,
		"Number of machine instructions hoisted out of loops post regalloc"
	)

STATISTIC() [7/7]

STATISTIC	(	NumStoreConst	,
		"Number of stores of const phys reg hoisted out of loops"
	)

Variable Documentation

AvoidSpeculation

cl::opt< bool > AvoidSpeculation("avoid-speculation", cl::desc("MachineLICM should avoid speculation"), cl::init(true), cl::Hidden) ( "avoid-speculation"  , cl::desc("MachineLICM should avoid speculation")  , cl::init(true)  , cl::Hidden    )

static

BlockFrequencyRatioThreshold

cl::opt< unsigned > BlockFrequencyRatioThreshold("block-freq-ratio-threshold", cl::desc("Do not hoist instructions if target" "block is N times hotter than the source."), cl::init(100), cl::Hidden) ( "block-freq-ratio-threshold"  , cl::desc("Do not hoist instructions if target" "block is N times hotter than the source.")  , cl::init(100)  , cl::Hidden    )

static

DEBUG_TYPE

DEBUG_TYPE

Definition at line 330 of file MachineLICM.cpp.

DisableHoistingToHotterBlocks

cl::opt< UseBFI > DisableHoistingToHotterBlocks("disable-hoisting-to-hotter-blocks", cl::desc("Disable hoisting instructions to" " hotter blocks"), cl::init(UseBFI::PGO), cl::Hidden, cl::values(clEnumValN(UseBFI::None, "none", "disable the feature"), clEnumValN(UseBFI::PGO, "pgo", "enable the feature when using profile data"), clEnumValN(UseBFI::All, "all", "enable the feature with/wo profile data"))) ( "disable-hoisting-to-hotter-blocks"  , cl::desc("Disable hoisting instructions to" " hotter blocks")  , cl::init(UseBFI::PGO)  , cl::Hidden  , cl::values(clEnumValN(UseBFI::None, "none", "disable the feature"), clEnumValN(UseBFI::PGO, "pgo", "enable the feature when using profile data"), clEnumValN(UseBFI::All, "all", "enable the feature with/wo profile data"))    )

static

false

Machine Loop Invariant Code false early Early Machine Loop Invariant Code false

Definition at line 331 of file MachineLICM.cpp.

HoistCheapInsts

cl::opt< bool > HoistCheapInsts("hoist-cheap-insts", cl::desc("MachineLICM should hoist even cheap instructions"), cl::init(false), cl::Hidden) ( "hoist-cheap-insts"  , cl::desc("MachineLICM should hoist even cheap instructions")  , cl::init(false)  , cl::Hidden    )

static

HoistConstLoads

cl::opt< bool > HoistConstLoads("hoist-const-loads", cl::desc("Hoist invariant loads"), cl::init(true), cl::Hidden) ( "hoist-const-loads"  , cl::desc("Hoist invariant loads")  , cl::init(true)  , cl::Hidden    )

static

HoistConstStores

cl::opt< bool > HoistConstStores("hoist-const-stores", cl::desc("Hoist invariant stores"), cl::init(true), cl::Hidden) ( "hoist-const-stores"  , cl::desc("Hoist invariant stores")  , cl::init(true)  , cl::Hidden    )

static

machinelicm

Machine Loop Invariant Code false early machinelicm

Definition at line 339 of file MachineLICM.cpp.

Motion

Machine Loop Invariant Code false early Early Machine Loop Invariant Code Motion

Definition at line 331 of file MachineLICM.cpp.