#include <SplitKit.h>

Collaboration diagram for llvm::SplitAnalysis:

Classes
struct	BlockInfo

Public Types
typedef SmallPtrSet< const MachineBasicBlock *, 16 >	BlockPtrSet

Public Member Functions
	SplitAnalysis (const VirtRegMap &vrm, const LiveIntervals &lis, const MachineLoopInfo &mli)

void	analyze (const LiveInterval *li)

bool	didRepairRange () const

void	clear ()

const LiveInterval &	getParent () const
	getParent - Return the last analyzed interval. More...

SlotIndex	getLastSplitPoint (unsigned Num)

MachineBasicBlock::iterator	getLastSplitPointIter (MachineBasicBlock *)
	getLastSplitPointIter - Returns the last split point as an iterator. More...

bool	isOriginalEndpoint (SlotIndex Idx) const

ArrayRef< SlotIndex >	getUseSlots () const

ArrayRef< BlockInfo >	getUseBlocks () const

unsigned	getNumThroughBlocks () const
	getNumThroughBlocks - Return the number of through blocks. More...

bool	isThroughBlock (unsigned MBB) const
	isThroughBlock - Return true if CurLI is live through MBB without uses. More...

const BitVector &	getThroughBlocks () const
	getThroughBlocks - Return the set of through blocks. More...

unsigned	getNumLiveBlocks () const
	getNumLiveBlocks - Return the number of blocks where CurLI is live. More...

unsigned	countLiveBlocks (const LiveInterval *li) const

bool	shouldSplitSingleBlock (const BlockInfo &BI, bool SingleInstrs) const

Public Attributes
const MachineFunction &	MF

const VirtRegMap &	VRM

const LiveIntervals &	LIS

const MachineLoopInfo &	Loops

const TargetInstrInfo &	TII

Detailed Description

SplitAnalysis - Analyze a LiveInterval, looking for live range splitting opportunities.

Definition at line 42 of file SplitKit.h.

Member Typedef Documentation

typedef SmallPtrSet<const MachineBasicBlock*, 16> llvm::SplitAnalysis::BlockPtrSet

Definition at line 186 of file SplitKit.h.

Constructor & Destructor Documentation

SplitAnalysis::SplitAnalysis	(	const VirtRegMap &	vrm,
		const LiveIntervals &	lis,
		const MachineLoopInfo &	mli
	)

Definition at line 42 of file SplitKit.cpp.

Member Function Documentation

void SplitAnalysis::analyze ( const LiveInterval * li )

analyze - set CurLI to the specified interval, and analyze how it may be split.

Definition at line 313 of file SplitKit.cpp.

References clear().

void SplitAnalysis::clear ( )

clear - clear all data structures so SplitAnalysis is ready to analyze a new interval.

Definition at line 53 of file SplitKit.cpp.

References llvm::BitVector::clear().

Referenced by analyze().

unsigned SplitAnalysis::countLiveBlocks ( const LiveInterval * li ) const

countLiveBlocks - Return the number of blocks where li is live. This is guaranteed to return the same number as getNumLiveBlocks() after calling analyze(li).

Definition at line 276 of file SplitKit.cpp.

References llvm::LiveRange::advanceTo(), llvm::LiveRange::begin(), llvm::LiveRange::empty(), llvm::LiveRange::end(), llvm::LiveIntervals::getMBBEndIdx(), llvm::LiveIntervals::getMBBFromIndex(), and LIS.

bool llvm::SplitAnalysis::didRepairRange ( ) const

inline

didRepairRange() - Returns true if CurLI was invalid and has been repaired by analyze(). This really shouldn't happen, but sometimes the coalescer can create live ranges that end in mid-air.

Definition at line 130 of file SplitKit.h.

SlotIndex llvm::SplitAnalysis::getLastSplitPoint ( unsigned Num )

inline

getLastSplitPoint - Return the base index of the last valid split point in the basic block numbered Num.

Definition at line 141 of file SplitKit.h.

Referenced by getLastSplitPointIter(), llvm::SplitEditor::splitLiveThroughBlock(), llvm::SplitEditor::splitRegInBlock(), llvm::SplitEditor::splitRegOutBlock(), and llvm::SplitEditor::splitSingleBlock().

MachineBasicBlock::iterator SplitAnalysis::getLastSplitPointIter ( MachineBasicBlock * MBB )

getLastSplitPointIter - Returns the last split point as an iterator.

Definition at line 114 of file SplitKit.cpp.

References llvm::MachineBasicBlock::end(), llvm::LiveIntervals::getInstructionFromIndex(), getLastSplitPoint(), llvm::LiveIntervals::getMBBEndIdx(), llvm::MachineBasicBlock::getNumber(), and LIS.

Referenced by llvm::SplitEditor::enterIntvAtEnd().

unsigned llvm::SplitAnalysis::getNumLiveBlocks ( ) const

inline

getNumLiveBlocks - Return the number of blocks where CurLI is live.

Definition at line 177 of file SplitKit.h.

References getNumThroughBlocks(), and getUseBlocks().

unsigned llvm::SplitAnalysis::getNumThroughBlocks ( ) const

inline

getNumThroughBlocks - Return the number of through blocks.

Definition at line 168 of file SplitKit.h.

Referenced by getNumLiveBlocks().

const LiveInterval& llvm::SplitAnalysis::getParent ( ) const

inline

getParent - Return the last analyzed interval.

Definition at line 137 of file SplitKit.h.

const BitVector& llvm::SplitAnalysis::getThroughBlocks ( ) const

inline

getThroughBlocks - Return the set of through blocks.

Definition at line 174 of file SplitKit.h.

ArrayRef<BlockInfo> llvm::SplitAnalysis::getUseBlocks ( ) const

inline

getUseBlocks - Return an array of BlockInfo objects for the basic blocks where CurLI has uses.

Definition at line 165 of file SplitKit.h.

Referenced by getNumLiveBlocks().

ArrayRef<SlotIndex> llvm::SplitAnalysis::getUseSlots ( ) const

inline

getUseSlots - Return an array of SlotIndexes of instructions using CurLI. This include both use and def operands, at most one entry per instruction.

Definition at line 161 of file SplitKit.h.

bool SplitAnalysis::isOriginalEndpoint ( SlotIndex Idx ) const

isOriginalEndpoint - Return true if the original live range was killed or (re-)defined at Idx. Idx should be the 'def' slot for a normal kill/def, and 'use' for an early-clobber def. This can be used to recognize code inserted by earlier live range splitting.

Definition at line 299 of file SplitKit.cpp.

References llvm::LiveRange::begin(), llvm::LiveRange::empty(), llvm::sys::path::end(), llvm::LiveRange::end(), llvm::LiveRange::find(), llvm::LiveIntervals::getInterval(), llvm::VirtRegMap::getOriginal(), I, LIS, llvm::LiveInterval::reg, and VRM.

Referenced by shouldSplitSingleBlock().

bool llvm::SplitAnalysis::isThroughBlock ( unsigned MBB ) const

inline

isThroughBlock - Return true if CurLI is live through MBB without uses.

Definition at line 171 of file SplitKit.h.

References llvm::BitVector::test().

bool SplitAnalysis::shouldSplitSingleBlock	(	const BlockInfo &	BI,
		bool	SingleInstrs
	)		const

shouldSplitSingleBlock - Returns true if it would help to create a local live range for the instructions in BI. There is normally no benefit to creating a live range for a single instruction, but it does enable register class inflation if the instruction has a restricted register class.

Parameters