TailDuplicator.cpp File Reference

#include "llvm/CodeGen/TailDuplicator.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/MachineSSAUpdater.h"
#include "llvm/CodeGen/MachineSizeOpts.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include <cassert>
#include <iterator>
#include <utility>

Go to the source code of this file.

Macros
#define	DEBUG_TYPE   "tailduplication"

Functions
	STATISTIC (NumTails, "Number of tails duplicated")
	STATISTIC (NumTailDups, "Number of tail duplicated blocks")
	STATISTIC (NumTailDupAdded, "Number of instructions added due to tail duplication")
	STATISTIC (NumTailDupRemoved, "Number of instructions removed due to tail duplication")
	STATISTIC (NumDeadBlocks, "Number of dead blocks removed")
	STATISTIC (NumAddedPHIs, "Number of phis added")
static void	VerifyPHIs (MachineFunction &MF, bool CheckExtra)
static bool	isDefLiveOut (Register Reg, MachineBasicBlock *BB, const MachineRegisterInfo *MRI)
static unsigned	getPHISrcRegOpIdx (MachineInstr *MI, MachineBasicBlock *SrcBB)
static void	getRegsUsedByPHIs (const MachineBasicBlock &BB, DenseSet< Register > *UsedByPhi)
static bool	bothUsedInPHI (const MachineBasicBlock &A, const SmallPtrSet< MachineBasicBlock *, 8 > &SuccsB)

Variables
static cl::opt< unsigned >	TailDuplicateSize ("tail-dup-size", cl::desc("Maximum instructions to consider tail duplicating"), cl::init(2), cl::Hidden)
static cl::opt< unsigned >	TailDupIndirectBranchSize ("tail-dup-indirect-size", cl::desc("Maximum instructions to consider tail duplicating blocks that " "end with indirect branches."), cl::init(20), cl::Hidden)
static cl::opt< unsigned >	TailDupPredSize ("tail-dup-pred-size", cl::desc("Maximum predecessors (maximum successors at the " "same time) to consider tail duplicating blocks."), cl::init(16), cl::Hidden)
static cl::opt< unsigned >	TailDupSuccSize ("tail-dup-succ-size", cl::desc("Maximum successors (maximum predecessors at the " "same time) to consider tail duplicating blocks."), cl::init(16), cl::Hidden)
static cl::opt< bool >	TailDupVerify ("tail-dup-verify", cl::desc("Verify sanity of PHI instructions during taildup"), cl::init(false), cl::Hidden)
static cl::opt< unsigned >	TailDupLimit ("tail-dup-limit", cl::init(~0U), cl::Hidden)

Macro Definition Documentation

DEBUG_TYPE

#define DEBUG_TYPE   "tailduplication"

Definition at line 47 of file TailDuplicator.cpp.

Function Documentation

bothUsedInPHI()

static bool bothUsedInPHI ( const MachineBasicBlock &  A, const SmallPtrSet< MachineBasicBlock *, 8 > &  SuccsB  )

static

Definition at line 711 of file TailDuplicator.cpp.

References A, llvm::MachineBasicBlock::begin(), llvm::SmallPtrSetImpl< PtrType >::count(), and llvm::MachineBasicBlock::empty().

getPHISrcRegOpIdx()

static unsigned getPHISrcRegOpIdx ( MachineInstr *  MI, MachineBasicBlock *  SrcBB  )

static

Definition at line 316 of file TailDuplicator.cpp.

References MI.

Referenced by llvm::TailDuplicator::shouldTailDuplicate().

getRegsUsedByPHIs()

static void getRegsUsedByPHIs ( const MachineBasicBlock &  BB, DenseSet< Register > *  UsedByPhi  )

static

Definition at line 326 of file TailDuplicator.cpp.

References llvm::detail::DenseSetImpl< ValueT, MapTy, ValueInfoT >::insert(), and MI.

isDefLiveOut()

static bool isDefLiveOut ( Register  Reg, MachineBasicBlock *  BB, const MachineRegisterInfo *  MRI  )

static

Definition at line 305 of file TailDuplicator.cpp.

References MRI, and UseMI.

STATISTIC() [1/6]

STATISTIC	(	NumAddedPHIs	,
		"Number of phis added"
	)

STATISTIC() [2/6]

STATISTIC	(	NumDeadBlocks	,
		"Number of dead blocks removed"
	)

STATISTIC() [3/6]

STATISTIC	(	NumTailDupAdded	,
		"Number of instructions added due to tail duplication"
	)

STATISTIC() [4/6]

STATISTIC	(	NumTailDupRemoved	,
		"Number of instructions removed due to tail duplication"
	)

STATISTIC() [5/6]

STATISTIC	(	NumTailDups	,
		"Number of tail duplicated blocks"
	)

STATISTIC() [6/6]

STATISTIC	(	NumTails	,
		"Number of tails duplicated"
	)

VerifyPHIs()

static void VerifyPHIs ( MachineFunction &  MF, bool  CheckExtra  )

static

Definition at line 110 of file TailDuplicator.cpp.

References llvm::MachineBasicBlock::begin(), llvm::dbgs(), llvm::drop_begin(), llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::getNumber(), llvm_unreachable, MBB, MI, llvm::MachineBasicBlock::pred_begin(), llvm::MachineBasicBlock::pred_end(), and llvm::printMBBReference().

Referenced by llvm::TailDuplicator::tailDuplicateBlocks().

Variable Documentation

TailDupIndirectBranchSize

cl::opt< unsigned > TailDupIndirectBranchSize("tail-dup-indirect-size", cl::desc("Maximum instructions to consider tail duplicating blocks that " "end with indirect branches."), cl::init(20), cl::Hidden) ( "tail-dup-indirect-size"  , cl::desc("Maximum instructions to consider tail duplicating blocks that " "end with indirect branches.")  , cl::init(20)  , cl::Hidden    )

static

Referenced by llvm::TailDuplicator::shouldTailDuplicate().

TailDuplicateSize

cl::opt< unsigned > TailDuplicateSize("tail-dup-size", cl::desc("Maximum instructions to consider tail duplicating"), cl::init(2), cl::Hidden) ( "tail-dup-size"  , cl::desc("Maximum instructions to consider tail duplicating")  , cl::init(2)  , cl::Hidden    )

static

Referenced by llvm::TailDuplicator::shouldTailDuplicate().

TailDupLimit

cl::opt< unsigned > TailDupLimit("tail-dup-limit", cl::init(~0U), cl::Hidden) ( "tail-dup-limit"  , cl::init(~0U)  , cl::Hidden    )

static

Referenced by llvm::TailDuplicator::tailDuplicateBlocks().

TailDupPredSize

cl::opt< unsigned > TailDupPredSize("tail-dup-pred-size", cl::desc("Maximum predecessors (maximum successors at the " "same time) to consider tail duplicating blocks."), cl::init(16), cl::Hidden) ( "tail-dup-pred-size"  , cl::desc("Maximum predecessors (maximum successors at the " "same time) to consider tail duplicating blocks.")  , cl::init(16)  , cl::Hidden    )

static

Referenced by llvm::TailDuplicator::shouldTailDuplicate().

TailDupSuccSize

cl::opt< unsigned > TailDupSuccSize("tail-dup-succ-size", cl::desc("Maximum successors (maximum predecessors at the " "same time) to consider tail duplicating blocks."), cl::init(16), cl::Hidden) ( "tail-dup-succ-size"  , cl::desc("Maximum successors (maximum predecessors at the " "same time) to consider tail duplicating blocks.")  , cl::init(16)  , cl::Hidden    )

static

Referenced by llvm::TailDuplicator::shouldTailDuplicate().

TailDupVerify

cl::opt< bool > TailDupVerify("tail-dup-verify", cl::desc("Verify sanity of PHI instructions during taildup"), cl::init(false), cl::Hidden) ( "tail-dup-verify"  , cl::desc("Verify sanity of PHI instructions during taildup")  , cl::init(false)  , cl::Hidden    )

static

Referenced by llvm::TailDuplicator::tailDuplicateBlocks().