LLVM  3.7.0
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llvm::LiveIntervals Class Reference

#include <LiveIntervalAnalysis.h>

Inheritance diagram for llvm::LiveIntervals:
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Collaboration diagram for llvm::LiveIntervals:
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Classes

class  HMEditor
 

Public Member Functions

 LiveIntervals ()
 
 ~LiveIntervals () override
 
LiveIntervalgetInterval (unsigned Reg)
 
const LiveIntervalgetInterval (unsigned Reg) const
 
bool hasInterval (unsigned Reg) const
 
LiveIntervalcreateEmptyInterval (unsigned Reg)
 
LiveIntervalcreateAndComputeVirtRegInterval (unsigned Reg)
 
void removeInterval (unsigned Reg)
 
LiveInterval::Segment addSegmentToEndOfBlock (unsigned reg, MachineInstr *startInst)
 Given a register and an instruction, adds a live segment from that instruction to the end of its MBB. More...
 
bool shrinkToUses (LiveInterval *li, SmallVectorImpl< MachineInstr * > *dead=nullptr)
 shrinkToUses - After removing some uses of a register, shrink its live range to just the remaining uses. More...
 
void shrinkToUses (LiveInterval::SubRange &SR, unsigned Reg)
 Specialized version of shrinkToUses(LiveInterval li, SmallVectorImpl<MachineInstr> *dead) that works on a subregister live range and only looks at uses matching the lane mask of the subregister range. More...
 
void extendToIndices (LiveRange &LR, ArrayRef< SlotIndex > Indices)
 extendToIndices - Extend the live range of LI to reach all points in Indices. More...
 
void pruneValue (LiveRange &LR, SlotIndex Kill, SmallVectorImpl< SlotIndex > *EndPoints)
 If LR has a live value at Kill, prune its live range by removing any liveness reachable from Kill. More...
 
SlotIndexesgetSlotIndexes () const
 
AliasAnalysisgetAliasAnalysis () const
 
bool isNotInMIMap (const MachineInstr *Instr) const
 isNotInMIMap - returns true if the specified machine instr has been removed or was never entered in the map. More...
 
SlotIndex getInstructionIndex (const MachineInstr *instr) const
 Returns the base index of the given instruction. More...
 
MachineInstrgetInstructionFromIndex (SlotIndex index) const
 Returns the instruction associated with the given index. More...
 
SlotIndex getMBBStartIdx (const MachineBasicBlock *mbb) const
 Return the first index in the given basic block. More...
 
SlotIndex getMBBEndIdx (const MachineBasicBlock *mbb) const
 Return the last index in the given basic block. More...
 
bool isLiveInToMBB (const LiveRange &LR, const MachineBasicBlock *mbb) const
 
bool isLiveOutOfMBB (const LiveRange &LR, const MachineBasicBlock *mbb) const
 
MachineBasicBlockgetMBBFromIndex (SlotIndex index) const
 
void insertMBBInMaps (MachineBasicBlock *MBB)
 
SlotIndex InsertMachineInstrInMaps (MachineInstr *MI)
 
void InsertMachineInstrRangeInMaps (MachineBasicBlock::iterator B, MachineBasicBlock::iterator E)
 
void RemoveMachineInstrFromMaps (MachineInstr *MI)
 
void ReplaceMachineInstrInMaps (MachineInstr *MI, MachineInstr *NewMI)
 
bool findLiveInMBBs (SlotIndex Start, SlotIndex End, SmallVectorImpl< MachineBasicBlock * > &MBBs) const
 
VNInfo::AllocatorgetVNInfoAllocator ()
 
void getAnalysisUsage (AnalysisUsage &AU) const override
 getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job. More...
 
void releaseMemory () override
 releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed. More...
 
bool runOnMachineFunction (MachineFunction &) override
 runOnMachineFunction - pass entry point More...
 
void print (raw_ostream &O, const Module *=nullptr) const override
 print - Implement the dump method. More...
 
MachineBasicBlockintervalIsInOneMBB (const LiveInterval &LI) const
 intervalIsInOneMBB - If LI is confined to a single basic block, return a pointer to that block. More...
 
bool hasPHIKill (const LiveInterval &LI, const VNInfo *VNI) const
 Returns true if VNI is killed by any PHI-def values in LI. More...
 
void addKillFlags (const VirtRegMap *)
 addKillFlags - Add kill flags to any instruction that kills a virtual register. More...
 
void handleMove (MachineInstr *MI, bool UpdateFlags=false)
 handleMove - call this method to notify LiveIntervals that instruction 'mi' has been moved within a basic block. More...
 
void handleMoveIntoBundle (MachineInstr *MI, MachineInstr *BundleStart, bool UpdateFlags=false)
 moveIntoBundle - Update intervals for operands of MI so that they begin/end on the SlotIndex for BundleStart. More...
 
void repairIntervalsInRange (MachineBasicBlock *MBB, MachineBasicBlock::iterator Begin, MachineBasicBlock::iterator End, ArrayRef< unsigned > OrigRegs)
 repairIntervalsInRange - Update live intervals for instructions in a range of iterators. More...
 
ArrayRef< SlotIndexgetRegMaskSlots () const
 getRegMaskSlots - Returns a sorted array of slot indices of all instructions with register mask operands. More...
 
ArrayRef< SlotIndexgetRegMaskSlotsInBlock (unsigned MBBNum) const
 getRegMaskSlotsInBlock - Returns a sorted array of slot indices of all instructions with register mask operands in the basic block numbered MBBNum. More...
 
ArrayRef< const uint32_t * > getRegMaskBits () const
 getRegMaskBits() - Returns an array of register mask pointers corresponding to getRegMaskSlots(). More...
 
ArrayRef< const uint32_t * > getRegMaskBitsInBlock (unsigned MBBNum) const
 getRegMaskBitsInBlock - Returns an array of mask pointers corresponding to getRegMaskSlotsInBlock(MBBNum). More...
 
bool checkRegMaskInterference (LiveInterval &LI, BitVector &UsableRegs)
 checkRegMaskInterference - Test if LI is live across any register mask instructions, and compute a bit mask of physical registers that are not clobbered by any of them. More...
 
LiveRangegetRegUnit (unsigned Unit)
 getRegUnit - Return the live range for Unit. More...
 
LiveRangegetCachedRegUnit (unsigned Unit)
 getCachedRegUnit - Return the live range for Unit if it has already been computed, or NULL if it hasn't been computed yet. More...
 
const LiveRangegetCachedRegUnit (unsigned Unit) const
 
void removePhysRegDefAt (unsigned Reg, SlotIndex Pos)
 Remove value numbers and related live segments starting at position Pos that are part of any liverange of physical register Reg or one of its subregisters. More...
 
void removeVRegDefAt (LiveInterval &LI, SlotIndex Pos)
 Remove value number and related live segments of LI and its subranges that start at position Pos. More...
 
- Public Member Functions inherited from llvm::FunctionPass
 FunctionPass (char &pid)
 
PasscreatePrinterPass (raw_ostream &O, const std::string &Banner) const override
 createPrinterPass - Get a function printer pass. More...
 
void assignPassManager (PMStack &PMS, PassManagerType T) override
 Find appropriate Function Pass Manager or Call Graph Pass Manager in the PM Stack and add self into that manager. More...
 
PassManagerType getPotentialPassManagerType () const override
 Return what kind of Pass Manager can manage this pass. More...
 
- Public Member Functions inherited from llvm::Pass
 Pass (PassKind K, char &pid)
 
virtual ~Pass ()
 
PassKind getPassKind () const
 
virtual const char * getPassName () const
 getPassName - Return a nice clean name for a pass. More...
 
AnalysisID getPassID () const
 getPassID - Return the PassID number that corresponds to this pass. More...
 
virtual bool doInitialization (Module &)
 doInitialization - Virtual method overridden by subclasses to do any necessary initialization before any pass is run. More...
 
virtual bool doFinalization (Module &)
 doFinalization - Virtual method overriden by subclasses to do any necessary clean up after all passes have run. More...
 
void dump () const
 
virtual void preparePassManager (PMStack &)
 Check if available pass managers are suitable for this pass or not. More...
 
void setResolver (AnalysisResolver *AR)
 
AnalysisResolvergetResolver () const
 
virtual void * getAdjustedAnalysisPointer (AnalysisID ID)
 getAdjustedAnalysisPointer - This method is used when a pass implements an analysis interface through multiple inheritance. More...
 
virtual ImmutablePassgetAsImmutablePass ()
 
virtual PMDataManagergetAsPMDataManager ()
 
virtual void verifyAnalysis () const
 verifyAnalysis() - This member can be implemented by a analysis pass to check state of analysis information. More...
 
virtual void dumpPassStructure (unsigned Offset=0)
 
template<typename AnalysisType >
AnalysisType * getAnalysisIfAvailable () const
 getAnalysisIfAvailable<AnalysisType>() - Subclasses use this function to get analysis information that might be around, for example to update it. More...
 
bool mustPreserveAnalysisID (char &AID) const
 mustPreserveAnalysisID - This method serves the same function as getAnalysisIfAvailable, but works if you just have an AnalysisID. More...
 
template<typename AnalysisType >
AnalysisType & getAnalysis () const
 getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function. More...
 
template<typename AnalysisType >
AnalysisType & getAnalysis (Function &F)
 getAnalysis<AnalysisType>() - This function is used by subclasses to get to the analysis information that they claim to use by overriding the getAnalysisUsage function. More...
 
template<typename AnalysisType >
AnalysisType & getAnalysisID (AnalysisID PI) const
 
template<typename AnalysisType >
AnalysisType & getAnalysisID (AnalysisID PI, Function &F)
 

Static Public Member Functions

static float getSpillWeight (bool isDef, bool isUse, const MachineBlockFrequencyInfo *MBFI, const MachineInstr *Instr)
 
- Static Public Member Functions inherited from llvm::Pass
static const PassInfolookupPassInfo (const void *TI)
 
static const PassInfolookupPassInfo (StringRef Arg)
 
static PasscreatePass (AnalysisID ID)
 

Static Public Attributes

static char ID = 0
 

Additional Inherited Members

- Protected Member Functions inherited from llvm::MachineFunctionPass
 MachineFunctionPass (char &ID)
 
void getAnalysisUsage (AnalysisUsage &AU) const override
 getAnalysisUsage - Subclasses that override getAnalysisUsage must call this. More...
 
- Protected Member Functions inherited from llvm::FunctionPass
bool skipOptnoneFunction (const Function &F) const
 skipOptnoneFunction - This function has Attribute::OptimizeNone and most transformation passes should skip it. More...
 

Detailed Description

Definition at line 53 of file LiveIntervalAnalysis.h.

Constructor & Destructor Documentation

LiveIntervals::LiveIntervals ( )
LiveIntervals::~LiveIntervals ( )
override

Definition at line 99 of file LiveIntervalAnalysis.cpp.

Member Function Documentation

void LiveIntervals::addKillFlags ( const VirtRegMap VRM)
LiveRange::Segment LiveIntervals::addSegmentToEndOfBlock ( unsigned  reg,
MachineInstr startInst 
)

Given a register and an instruction, adds a live segment from that instruction to the end of its MBB.

Definition at line 820 of file LiveIntervalAnalysis.cpp.

References llvm::LiveRange::addSegment(), createEmptyInterval(), getInstructionIndex(), getMBBEndIdx(), llvm::LiveRange::getNextValue(), llvm::MachineInstr::getParent(), and getVNInfoAllocator().

bool LiveIntervals::checkRegMaskInterference ( LiveInterval LI,
BitVector UsableRegs 
)

checkRegMaskInterference - Test if LI is live across any register mask instructions, and compute a bit mask of physical registers that are not clobbered by any of them.

Returns false if LI doesn't cross any register mask instructions. In that case, the bit vector is not filled in.

Definition at line 838 of file LiveIntervalAnalysis.cpp.

References llvm::LiveRange::advanceTo(), llvm::ArrayRef< T >::begin(), llvm::LiveRange::begin(), llvm::tgtok::Bits, llvm::BitVector::clear(), llvm::BitVector::clearBitsNotInMask(), llvm::LiveRange::empty(), llvm::sys::path::end(), llvm::ArrayRef< T >::end(), llvm::LiveRange::end(), Found(), llvm::MachineBasicBlock::getNumber(), llvm::MCRegisterInfo::getNumRegs(), getRegMaskBits(), getRegMaskBitsInBlock(), getRegMaskSlots(), getRegMaskSlotsInBlock(), intervalIsInOneMBB(), and llvm::BitVector::resize().

Referenced by llvm::LiveRegMatrix::checkRegMaskInterference().

LiveInterval& llvm::LiveIntervals::createAndComputeVirtRegInterval ( unsigned  Reg)
inline

Definition at line 133 of file LiveIntervalAnalysis.h.

References createEmptyInterval().

Referenced by getInterval(), and repairIntervalsInRange().

LiveInterval& llvm::LiveIntervals::createEmptyInterval ( unsigned  Reg)
inline
void LiveIntervals::extendToIndices ( LiveRange LR,
ArrayRef< SlotIndex Indices 
)

extendToIndices - Extend the live range of LI to reach all points in Indices.

The points in the Indices array must be jointly dominated by existing defs in LI. PHI-defs are added as needed to maintain SSA form.

If a SlotIndex in Indices is the end index of a basic block, LI will be extended to be live out of the basic block.

See also LiveRangeCalc::extend().

Definition at line 567 of file LiveIntervalAnalysis.cpp.

References llvm::LiveRangeCalc::extend(), getSlotIndexes(), getVNInfoAllocator(), llvm::LiveRangeCalc::reset(), and llvm::ArrayRef< T >::size().

bool llvm::LiveIntervals::findLiveInMBBs ( SlotIndex  Start,
SlotIndex  End,
SmallVectorImpl< MachineBasicBlock * > &  MBBs 
) const
inline

Definition at line 260 of file LiveIntervalAnalysis.h.

References llvm::SlotIndexes::findLiveInMBBs().

AliasAnalysis* llvm::LiveIntervals::getAliasAnalysis ( ) const
inline

Definition at line 191 of file LiveIntervalAnalysis.h.

Referenced by isRematerializable().

void LiveIntervals::getAnalysisUsage ( AnalysisUsage ) const
overridevirtual

getAnalysisUsage - This function should be overriden by passes that need analysis information to do their job.

If a pass specifies that it uses a particular analysis result to this function, it can then use the getAnalysis<AnalysisType>() function, below.

Reimplemented from llvm::Pass.

Definition at line 77 of file LiveIntervalAnalysis.cpp.

References llvm::AnalysisUsage::addPreserved(), llvm::AnalysisUsage::addPreservedID(), llvm::AnalysisUsage::addRequired(), llvm::AnalysisUsage::addRequiredTransitive(), llvm::AnalysisUsage::addRequiredTransitiveID(), llvm::MachineFunctionPass::getAnalysisUsage(), llvm::MachineDominatorsID, llvm::MachineLoopInfoID, and llvm::AnalysisUsage::setPreservesCFG().

LiveRange* llvm::LiveIntervals::getCachedRegUnit ( unsigned  Unit)
inline

getCachedRegUnit - Return the live range for Unit if it has already been computed, or NULL if it hasn't been computed yet.

Definition at line 392 of file LiveIntervalAnalysis.h.

Referenced by llvm::RegPressureTracker::getLiveRange(), and removePhysRegDefAt().

const LiveRange* llvm::LiveIntervals::getCachedRegUnit ( unsigned  Unit) const
inline

Definition at line 396 of file LiveIntervalAnalysis.h.

MachineInstr* llvm::LiveIntervals::getInstructionFromIndex ( SlotIndex  index) const
inline
SlotIndex llvm::LiveIntervals::getInstructionIndex ( const MachineInstr instr) const
inline
LiveInterval& llvm::LiveIntervals::getInterval ( unsigned  Reg)
inline
const LiveInterval& llvm::LiveIntervals::getInterval ( unsigned  Reg) const
inline

Definition at line 117 of file LiveIntervalAnalysis.h.

References getInterval().

SlotIndex llvm::LiveIntervals::getMBBEndIdx ( const MachineBasicBlock mbb) const
inline
MachineBasicBlock* llvm::LiveIntervals::getMBBFromIndex ( SlotIndex  index) const
inline
SlotIndex llvm::LiveIntervals::getMBBStartIdx ( const MachineBasicBlock mbb) const
inline

Return the first index in the given basic block.

Definition at line 212 of file LiveIntervalAnalysis.h.

References llvm::SlotIndexes::getMBBStartIdx().

Referenced by findInsertLocation(), handleMove(), isLiveInToMBB(), llvm::SplitEditor::leaveIntvAtTop(), and llvm::SplitEditor::useIntv().

ArrayRef<const uint32_t*> llvm::LiveIntervals::getRegMaskBits ( ) const
inline

getRegMaskBits() - Returns an array of register mask pointers corresponding to getRegMaskSlots().

Definition at line 348 of file LiveIntervalAnalysis.h.

Referenced by checkRegMaskInterference(), and getRegMaskBitsInBlock().

ArrayRef<const uint32_t*> llvm::LiveIntervals::getRegMaskBitsInBlock ( unsigned  MBBNum) const
inline

getRegMaskBitsInBlock - Returns an array of mask pointers corresponding to getRegMaskSlotsInBlock(MBBNum).

Definition at line 352 of file LiveIntervalAnalysis.h.

References getRegMaskBits(), and P.

Referenced by checkRegMaskInterference().

ArrayRef<SlotIndex> llvm::LiveIntervals::getRegMaskSlots ( ) const
inline

getRegMaskSlots - Returns a sorted array of slot indices of all instructions with register mask operands.

Definition at line 336 of file LiveIntervalAnalysis.h.

Referenced by checkRegMaskInterference(), and getRegMaskSlotsInBlock().

ArrayRef<SlotIndex> llvm::LiveIntervals::getRegMaskSlotsInBlock ( unsigned  MBBNum) const
inline

getRegMaskSlotsInBlock - Returns a sorted array of slot indices of all instructions with register mask operands in the basic block numbered MBBNum.

Definition at line 341 of file LiveIntervalAnalysis.h.

References getRegMaskSlots(), and P.

Referenced by checkRegMaskInterference().

LiveRange& llvm::LiveIntervals::getRegUnit ( unsigned  Unit)
inline

getRegUnit - Return the live range for Unit.

It will be computed if it doesn't exist.

Definition at line 379 of file LiveIntervalAnalysis.h.

References llvm::UseSegmentSetForPhysRegs.

Referenced by addKillFlags(), llvm::LiveRegMatrix::checkRegUnitInterference(), and runOnMachineFunction().

SlotIndexes* llvm::LiveIntervals::getSlotIndexes ( ) const
inline
float LiveIntervals::getSpillWeight ( bool  isDef,
bool  isUse,
const MachineBlockFrequencyInfo MBFI,
const MachineInstr Instr 
)
static
VNInfo::Allocator& llvm::LiveIntervals::getVNInfoAllocator ( )
inline
void LiveIntervals::handleMove ( MachineInstr MI,
bool  UpdateFlags = false 
)

handleMove - call this method to notify LiveIntervals that instruction 'mi' has been moved within a basic block.

This will update the live intervals for all operands of mi. Moves between basic blocks are not supported.

Parameters
UpdateFlagsUpdate live intervals for nonallocatable physregs.

Definition at line 1232 of file LiveIntervalAnalysis.cpp.

References llvm::SlotIndexes::getInstructionIndex(), getMBBEndIdx(), getMBBStartIdx(), llvm::MachineInstr::getParent(), llvm::SlotIndexes::insertMachineInstrInMaps(), llvm::MachineInstr::isBundled(), llvm::SlotIndexes::removeMachineInstrFromMaps(), and llvm::LiveIntervals::HMEditor::updateAllRanges().

void LiveIntervals::handleMoveIntoBundle ( MachineInstr MI,
MachineInstr BundleStart,
bool  UpdateFlags = false 
)

moveIntoBundle - Update intervals for operands of MI so that they begin/end on the SlotIndex for BundleStart.

Parameters
UpdateFlagsUpdate live intervals for nonallocatable physregs.

Requires MI and BundleStart to have SlotIndexes, and assumes existing liveness is accurate. BundleStart should be the first instruction in the Bundle.

Definition at line 1245 of file LiveIntervalAnalysis.cpp.

References llvm::SlotIndexes::getInstructionIndex(), and llvm::LiveIntervals::HMEditor::updateAllRanges().

bool llvm::LiveIntervals::hasInterval ( unsigned  Reg) const
inline
bool LiveIntervals::hasPHIKill ( const LiveInterval LI,
const VNInfo VNI 
) const
SlotIndex llvm::LiveIntervals::InsertMachineInstrInMaps ( MachineInstr MI)
inline
void llvm::LiveIntervals::InsertMachineInstrRangeInMaps ( MachineBasicBlock::iterator  B,
MachineBasicBlock::iterator  E 
)
inline

Definition at line 246 of file LiveIntervalAnalysis.h.

References I, and llvm::SlotIndexes::insertMachineInstrInMaps().

void llvm::LiveIntervals::insertMBBInMaps ( MachineBasicBlock MBB)
inline
MachineBasicBlock * LiveIntervals::intervalIsInOneMBB ( const LiveInterval LI) const

intervalIsInOneMBB - If LI is confined to a single basic block, return a pointer to that block.

If LI is live in to or out of any block, return NULL.

Definition at line 770 of file LiveIntervalAnalysis.cpp.

References llvm::LiveRange::beginIndex(), llvm::LiveRange::endIndex(), llvm::SlotIndexes::getMBBFromIndex(), and llvm::SlotIndex::isBlock().

Referenced by checkRegMaskInterference(), and isLocalCopy().

bool llvm::LiveIntervals::isLiveInToMBB ( const LiveRange LR,
const MachineBasicBlock mbb 
) const
inline

Definition at line 221 of file LiveIntervalAnalysis.h.

References getMBBStartIdx(), and llvm::LiveRange::liveAt().

bool llvm::LiveIntervals::isLiveOutOfMBB ( const LiveRange LR,
const MachineBasicBlock mbb 
) const
inline
bool llvm::LiveIntervals::isNotInMIMap ( const MachineInstr Instr) const
inline

isNotInMIMap - returns true if the specified machine instr has been removed or was never entered in the map.

Definition at line 197 of file LiveIntervalAnalysis.h.

References llvm::SlotIndexes::hasIndex().

Referenced by isPlainlyKilled().

void LiveIntervals::print ( raw_ostream O,
const Module = nullptr 
) const
overridevirtual

print - Implement the dump method.

Reimplemented from llvm::Pass.

Definition at line 155 of file LiveIntervalAnalysis.cpp.

References getInterval(), llvm::MachineRegisterInfo::getNumVirtRegs(), hasInterval(), and llvm::TargetRegisterInfo::index2VirtReg().

void LiveIntervals::pruneValue ( LiveRange LR,
SlotIndex  Kill,
SmallVectorImpl< SlotIndex > *  EndPoints 
)

If LR has a live value at Kill, prune its live range by removing any liveness reachable from Kill.

Add live range end points to EndPoints such that extendToIndices(LI, EndPoints) will reconstruct the value's live range.

Calling pruneValue() and extendToIndices() can be used to reconstruct SSA form after adding defs to a virtual register.

Definition at line 575 of file LiveIntervalAnalysis.cpp.

References llvm::df_ext_begin(), llvm::df_ext_end(), llvm::LiveQueryResult::endPoint(), llvm::SlotIndexes::getMBBEndIdx(), llvm::SlotIndexes::getMBBFromIndex(), llvm::SlotIndexes::getMBBRange(), I, llvm::SmallVectorTemplateBase< T, isPodLike< T >::value >::push_back(), llvm::LiveRange::Query(), llvm::LiveRange::removeSegment(), llvm::MachineBasicBlock::succ_begin(), llvm::MachineBasicBlock::succ_end(), llvm::LiveQueryResult::valueIn(), and llvm::LiveQueryResult::valueOutOrDead().

void LiveIntervals::releaseMemory ( )
overridevirtual

releaseMemory() - This member can be implemented by a pass if it wants to be able to release its memory when it is no longer needed.

The default behavior of passes is to hold onto memory for the entire duration of their lifetime (which is the entire compile time). For pipelined passes, this is not a big deal because that memory gets recycled every time the pass is invoked on another program unit. For IP passes, it is more important to free memory when it is unused.

Optionally implement this function to release pass memory when it is no longer used.

Reimplemented from llvm::Pass.

Definition at line 103 of file LiveIntervalAnalysis.cpp.

References llvm::SmallVectorImpl< T >::clear(), llvm::TargetRegisterInfo::index2VirtReg(), and llvm::BumpPtrAllocatorImpl< AllocatorT, SlabSize, SizeThreshold >::Reset().

void llvm::LiveIntervals::removeInterval ( unsigned  Reg)
inline
void llvm::LiveIntervals::RemoveMachineInstrFromMaps ( MachineInstr MI)
inline
void LiveIntervals::removePhysRegDefAt ( unsigned  Reg,
SlotIndex  Pos 
)

Remove value numbers and related live segments starting at position Pos that are part of any liverange of physical register Reg or one of its subregisters.

Definition at line 1394 of file LiveIntervalAnalysis.cpp.

References getCachedRegUnit(), llvm::LiveRange::getVNInfoAt(), llvm::MCRegisterInfo::DiffListIterator::isValid(), and llvm::LiveRange::removeValNo().

void LiveIntervals::removeVRegDefAt ( LiveInterval LI,
SlotIndex  Pos 
)

Remove value number and related live segments of LI and its subranges that start at position Pos.

Definition at line 1402 of file LiveIntervalAnalysis.cpp.

References llvm::LiveRange::getVNInfoAt(), llvm::LiveInterval::removeEmptySubRanges(), llvm::LiveRange::removeValNo(), and llvm::LiveInterval::subranges().

void LiveIntervals::repairIntervalsInRange ( MachineBasicBlock MBB,
MachineBasicBlock::iterator  Begin,
MachineBasicBlock::iterator  End,
ArrayRef< unsigned OrigRegs 
)

repairIntervalsInRange - Update live intervals for instructions in a range of iterators.

It is intended for use after target hooks that may insert or remove instructions, and is only efficient for a small number of instructions.

OrigRegs is a vector of registers that were originally used by the instructions in the range between the two iterators.

Currently, the only only changes that are supported are simple removal and addition of uses.

Definition at line 1343 of file LiveIntervalAnalysis.cpp.

References llvm::MachineBasicBlock::begin(), createAndComputeVirtRegInterval(), llvm::MachineBasicBlock::end(), getInstructionIndex(), getInterval(), getMBBEndIdx(), llvm::SlotIndex::getPrevSlot(), llvm::LiveRange::hasAtLeastOneValue(), llvm::SlotIndexes::hasIndex(), hasInterval(), I, llvm::MachineInstr::isDebugValue(), llvm::TargetRegisterInfo::isVirtualRegister(), llvm::MachineInstr::operands_begin(), llvm::MachineInstr::operands_end(), llvm::SlotIndexes::repairIndexesInRange(), llvm::ArrayRef< T >::size(), and llvm::LiveInterval::subranges().

void llvm::LiveIntervals::ReplaceMachineInstrInMaps ( MachineInstr MI,
MachineInstr NewMI 
)
inline
bool LiveIntervals::runOnMachineFunction ( MachineFunction fn)
overridevirtual
bool LiveIntervals::shrinkToUses ( LiveInterval li,
SmallVectorImpl< MachineInstr * > *  dead = nullptr 
)

shrinkToUses - After removing some uses of a register, shrink its live range to just the remaining uses.

This method does not compute reaching defs for new uses, and it doesn't remove dead defs. Dead PHIDef values are marked as unused. New dead machine instructions are added to the dead vector. Return true if the interval may have been separated into multiple connected components.

This method does not compute reaching defs for new uses, and it doesn't remove dead defs.

Definition at line 402 of file LiveIntervalAnalysis.cpp.

References createSegmentsForValues(), llvm::dbgs(), DEBUG, extendSegmentsToUses(), getInstructionIndex(), llvm::SlotIndex::getRegSlot(), I, llvm::MachineInstr::isDebugValue(), llvm::TargetRegisterInfo::isVirtualRegister(), llvm::make_range(), llvm::SmallVectorTemplateBase< T, isPodLike >::push_back(), llvm::LiveRange::Query(), llvm::MachineInstr::readsVirtualRegister(), llvm::LiveInterval::reg, llvm::MachineRegisterInfo::reg_instr_begin(), llvm::MachineRegisterInfo::reg_instr_end(), llvm::LiveRange::segments, llvm::LiveInterval::subranges(), llvm::SmallVectorImpl< T >::swap(), llvm::LiveQueryResult::valueDefined(), llvm::LiveQueryResult::valueIn(), llvm::LiveRange::vni_begin(), and llvm::LiveRange::vni_end().

Referenced by llvm::LiveRangeEdit::eliminateDeadDefs().

void LiveIntervals::shrinkToUses ( LiveInterval::SubRange SR,
unsigned  Reg 
)

Member Data Documentation

char LiveIntervals::ID = 0
static

Definition at line 101 of file LiveIntervalAnalysis.h.


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