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llvm::LiveRange Class Reference

This class represents the liveness of a register, stack slot, etc. More...

#include "llvm/CodeGen/LiveInterval.h"

Inheritance diagram for llvm::LiveRange:
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Classes

struct  Segment
 This represents a simple continuous liveness interval for a value. More...
 

Public Types

using Segments = SmallVector< Segment, 2 >
 
using VNInfoList = SmallVector< VNInfo *, 2 >
 
using SegmentSet = std::set< Segment >
 
using iterator = Segments::iterator
 
using const_iterator = Segments::const_iterator
 
using vni_iterator = VNInfoList::iterator
 
using const_vni_iterator = VNInfoList::const_iterator
 

Public Member Functions

iterator begin ()
 
iterator end ()
 
const_iterator begin () const
 
const_iterator end () const
 
vni_iterator vni_begin ()
 
vni_iterator vni_end ()
 
const_vni_iterator vni_begin () const
 
const_vni_iterator vni_end () const
 
iterator_range< vni_iteratorvnis ()
 
iterator_range< const_vni_iteratorvnis () const
 
 LiveRange (bool UseSegmentSet=false)
 Constructs a new LiveRange object.
 
 LiveRange (const LiveRange &Other, BumpPtrAllocator &Allocator)
 Constructs a new LiveRange object by copying segments and valnos from another LiveRange.
 
void assign (const LiveRange &Other, BumpPtrAllocator &Allocator)
 Copies values numbers and live segments from Other into this range.
 
iterator advanceTo (iterator I, SlotIndex Pos)
 advanceTo - Advance the specified iterator to point to the Segment containing the specified position, or end() if the position is past the end of the range.
 
const_iterator advanceTo (const_iterator I, SlotIndex Pos) const
 
iterator find (SlotIndex Pos)
 find - Return an iterator pointing to the first segment that ends after Pos, or end().
 
const_iterator find (SlotIndex Pos) const
 
void clear ()
 
size_t size () const
 
bool hasAtLeastOneValue () const
 
bool containsOneValue () const
 
unsigned getNumValNums () const
 
VNInfogetValNumInfo (unsigned ValNo)
 getValNumInfo - Returns pointer to the specified val#.
 
const VNInfogetValNumInfo (unsigned ValNo) const
 
bool containsValue (const VNInfo *VNI) const
 containsValue - Returns true if VNI belongs to this range.
 
VNInfogetNextValue (SlotIndex Def, VNInfo::Allocator &VNInfoAllocator)
 getNextValue - Create a new value number and return it.
 
VNInfocreateDeadDef (SlotIndex Def, VNInfo::Allocator &VNIAlloc)
 createDeadDef - Make sure the range has a value defined at Def.
 
VNInfocreateDeadDef (VNInfo *VNI)
 Create a def of value VNI.
 
VNInfocreateValueCopy (const VNInfo *orig, VNInfo::Allocator &VNInfoAllocator)
 Create a copy of the given value.
 
void RenumberValues ()
 RenumberValues - Renumber all values in order of appearance and remove unused values.
 
VNInfoMergeValueNumberInto (VNInfo *V1, VNInfo *V2)
 MergeValueNumberInto - This method is called when two value numbers are found to be equivalent.
 
void MergeSegmentsInAsValue (const LiveRange &RHS, VNInfo *LHSValNo)
 Merge all of the live segments of a specific val# in RHS into this live range as the specified value number.
 
void MergeValueInAsValue (const LiveRange &RHS, const VNInfo *RHSValNo, VNInfo *LHSValNo)
 MergeValueInAsValue - Merge all of the segments of a specific val# in RHS into this live range as the specified value number.
 
bool empty () const
 
SlotIndex beginIndex () const
 beginIndex - Return the lowest numbered slot covered.
 
SlotIndex endIndex () const
 endNumber - return the maximum point of the range of the whole, exclusive.
 
bool expiredAt (SlotIndex index) const
 
bool liveAt (SlotIndex index) const
 
const SegmentgetSegmentContaining (SlotIndex Idx) const
 Return the segment that contains the specified index, or null if there is none.
 
SegmentgetSegmentContaining (SlotIndex Idx)
 Return the live segment that contains the specified index, or null if there is none.
 
VNInfogetVNInfoAt (SlotIndex Idx) const
 getVNInfoAt - Return the VNInfo that is live at Idx, or NULL.
 
VNInfogetVNInfoBefore (SlotIndex Idx) const
 getVNInfoBefore - Return the VNInfo that is live up to but not necessarilly including Idx, or NULL.
 
iterator FindSegmentContaining (SlotIndex Idx)
 Return an iterator to the segment that contains the specified index, or end() if there is none.
 
const_iterator FindSegmentContaining (SlotIndex Idx) const
 
bool overlaps (const LiveRange &other) const
 overlaps - Return true if the intersection of the two live ranges is not empty.
 
bool overlaps (const LiveRange &Other, const CoalescerPair &CP, const SlotIndexes &) const
 overlaps - Return true if the two ranges have overlapping segments that are not coalescable according to CP.
 
bool overlaps (SlotIndex Start, SlotIndex End) const
 overlaps - Return true if the live range overlaps an interval specified by [Start, End).
 
bool overlapsFrom (const LiveRange &Other, const_iterator StartPos) const
 overlapsFrom - Return true if the intersection of the two live ranges is not empty.
 
bool covers (const LiveRange &Other) const
 Returns true if all segments of the Other live range are completely covered by this live range.
 
iterator addSegment (Segment S)
 Add the specified Segment to this range, merging segments as appropriate.
 
std::pair< VNInfo *, boolextendInBlock (ArrayRef< SlotIndex > Undefs, SlotIndex StartIdx, SlotIndex Kill)
 Attempt to extend a value defined after StartIdx to include Use.
 
VNInfoextendInBlock (SlotIndex StartIdx, SlotIndex Kill)
 Simplified version of the above "extendInBlock", which assumes that no register lanes are undefined by <def,read-undef> operands.
 
void join (LiveRange &Other, const int *ValNoAssignments, const int *RHSValNoAssignments, SmallVectorImpl< VNInfo * > &NewVNInfo)
 join - Join two live ranges (this, and other) together.
 
bool isLocal (SlotIndex Start, SlotIndex End) const
 True iff this segment is a single segment that lies between the specified boundaries, exclusively.
 
void removeSegment (SlotIndex Start, SlotIndex End, bool RemoveDeadValNo=false)
 Remove the specified interval from this live range.
 
void removeSegment (Segment S, bool RemoveDeadValNo=false)
 
iterator removeSegment (iterator I, bool RemoveDeadValNo=false)
 Remove segment pointed to by iterator I from this range.
 
void removeValNoIfDead (VNInfo *ValNo)
 Mark ValNo for deletion if no segments in this range use it.
 
LiveQueryResult Query (SlotIndex Idx) const
 Query Liveness at Idx.
 
void removeValNo (VNInfo *ValNo)
 removeValNo - Remove all the segments defined by the specified value#.
 
bool isZeroLength (SlotIndexes *Indexes) const
 Returns true if the live range is zero length, i.e.
 
bool isLiveAtIndexes (ArrayRef< SlotIndex > Slots) const
 
bool operator< (const LiveRange &other) const
 
bool isUndefIn (ArrayRef< SlotIndex > Undefs, SlotIndex Begin, SlotIndex End) const
 Returns true if there is an explicit "undef" between Begin End.
 
void flushSegmentSet ()
 Flush segment set into the regular segment vector.
 
template<typename Range , typename OutputIt >
bool findIndexesLiveAt (Range &&R, OutputIt O) const
 Stores indexes from the input index sequence R at which this LiveRange is live to the output O iterator.
 
void print (raw_ostream &OS) const
 
void dump () const
 
void verify () const
 Walk the range and assert if any invariants fail to hold.
 

Public Attributes

Segments segments
 
VNInfoList valnos
 
std::unique_ptr< SegmentSetsegmentSet
 

Protected Member Functions

void append (const LiveRange::Segment S)
 Append a segment to the list of segments.
 

Friends

class LiveRangeUpdater
 

Detailed Description

This class represents the liveness of a register, stack slot, etc.

It manages an ordered list of Segment objects. The Segments are organized in a static single assignment form: At places where a new value is defined or different values reach a CFG join a new segment with a new value number is used.

Definition at line 157 of file LiveInterval.h.

Member Typedef Documentation

◆ const_iterator

Definition at line 213 of file LiveInterval.h.

◆ const_vni_iterator

Definition at line 222 of file LiveInterval.h.

◆ iterator

Definition at line 212 of file LiveInterval.h.

◆ Segments

Definition at line 200 of file LiveInterval.h.

◆ SegmentSet

Definition at line 209 of file LiveInterval.h.

◆ vni_iterator

Definition at line 221 of file LiveInterval.h.

◆ VNInfoList

Definition at line 201 of file LiveInterval.h.

Constructor & Destructor Documentation

◆ LiveRange() [1/2]

llvm::LiveRange::LiveRange ( bool  UseSegmentSet = false)
inline

Constructs a new LiveRange object.

Definition at line 239 of file LiveInterval.h.

◆ LiveRange() [2/2]

llvm::LiveRange::LiveRange ( const LiveRange Other,
BumpPtrAllocator Allocator 
)
inline

Constructs a new LiveRange object by copying segments and valnos from another LiveRange.

Definition at line 245 of file LiveInterval.h.

References Allocator, assert(), assign(), and llvm::Other.

Member Function Documentation

◆ addSegment()

LiveRange::iterator LiveRange::addSegment ( Segment  S)

Add the specified Segment to this range, merging segments as appropriate.

This returns an iterator to the inserted segment (which may have grown since it was inserted).

Definition at line 533 of file LiveInterval.cpp.

References end(), and segmentSet.

Referenced by llvm::LiveRegMatrix::checkInterference(), and createSegmentsForValues().

◆ advanceTo() [1/2]

const_iterator llvm::LiveRange::advanceTo ( const_iterator  I,
SlotIndex  Pos 
) const
inline

Definition at line 279 of file LiveInterval.h.

References assert(), end(), endIndex(), and I.

◆ advanceTo() [2/2]

iterator llvm::LiveRange::advanceTo ( iterator  I,
SlotIndex  Pos 
)
inline

advanceTo - Advance the specified iterator to point to the Segment containing the specified position, or end() if the position is past the end of the range.

If no Segment contains this position, but the position is in a hole, this method returns an iterator pointing to the Segment immediately after the hole.

Definition at line 271 of file LiveInterval.h.

References assert(), end(), endIndex(), and I.

Referenced by llvm::LiveIntervals::addKillFlags(), llvm::SplitAnalysis::countLiveBlocks(), covers(), and isLiveAtIndexes().

◆ append()

void LiveRange::append ( const LiveRange::Segment  S)
protected

◆ assign()

void llvm::LiveRange::assign ( const LiveRange Other,
BumpPtrAllocator Allocator 
)
inline

◆ begin() [1/2]

iterator llvm::LiveRange::begin ( )
inline

◆ begin() [2/2]

const_iterator llvm::LiveRange::begin ( ) const
inline

◆ beginIndex()

SlotIndex llvm::LiveRange::beginIndex ( ) const
inline

◆ clear()

void llvm::LiveRange::clear ( )
inline

◆ containsOneValue()

bool llvm::LiveRange::containsOneValue ( ) const
inline

Definition at line 311 of file LiveInterval.h.

References llvm::SmallVectorBase< Size_T >::size(), and valnos.

◆ containsValue()

bool llvm::LiveRange::containsValue ( const VNInfo VNI) const
inline

containsValue - Returns true if VNI belongs to this range.

Definition at line 325 of file LiveInterval.h.

References getNumValNums(), getValNumInfo(), and llvm::VNInfo::id.

◆ covers()

bool LiveRange::covers ( const LiveRange Other) const

Returns true if all segments of the Other live range are completely covered by this live range.

Adjacent live ranges do not affect the covering:the liverange [1,5](5,10] covers (3,7].

Definition at line 479 of file LiveInterval.cpp.

References advanceTo(), begin(), empty(), end(), I, llvm::Last, and llvm::Other.

Referenced by llvm::LiveIntervals::HMEditor::updateAllRanges(), and llvm::LiveInterval::verify().

◆ createDeadDef() [1/2]

VNInfo * LiveRange::createDeadDef ( SlotIndex  Def,
VNInfo::Allocator VNIAlloc 
)

createDeadDef - Make sure the range has a value defined at Def.

If one already exists, return it. Otherwise allocate a new value and add liveness for a dead def.

Definition at line 355 of file LiveInterval.cpp.

References segmentSet.

Referenced by llvm::LiveIntervalCalc::constructMainRangeFromSubranges(), createDeadDef(), and llvm::SystemZInstrInfo::foldMemoryOperandImpl().

◆ createDeadDef() [2/2]

VNInfo * LiveRange::createDeadDef ( VNInfo VNI)

Create a def of value VNI.

Return VNI. If there already exists a definition at VNI->def, the value defined there must be VNI.

Definition at line 363 of file LiveInterval.cpp.

References llvm::VNInfo::def, and segmentSet.

◆ createValueCopy()

VNInfo * llvm::LiveRange::createValueCopy ( const VNInfo orig,
VNInfo::Allocator VNInfoAllocator 
)
inline

Create a copy of the given value.

The new value will be identical except for the Value number.

Definition at line 349 of file LiveInterval.h.

References llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorBase< Size_T >::size(), and valnos.

Referenced by assign().

◆ dump()

LLVM_DUMP_METHOD void LiveRange::dump ( ) const

Definition at line 1044 of file LiveInterval.cpp.

References llvm::dbgs().

◆ empty()

bool llvm::LiveRange::empty ( ) const
inline

◆ end() [1/2]

iterator llvm::LiveRange::end ( )
inline

◆ end() [2/2]

const_iterator llvm::LiveRange::end ( ) const
inline

◆ endIndex()

SlotIndex llvm::LiveRange::endIndex ( ) const
inline

◆ expiredAt()

bool llvm::LiveRange::expiredAt ( SlotIndex  index) const
inline

Definition at line 397 of file LiveInterval.h.

References endIndex().

Referenced by regJustKilledBefore().

◆ extendInBlock() [1/2]

std::pair< VNInfo *, bool > LiveRange::extendInBlock ( ArrayRef< SlotIndex Undefs,
SlotIndex  StartIdx,
SlotIndex  Kill 
)

Attempt to extend a value defined after StartIdx to include Use.

Both StartIdx and Use should be in the same basic block. In case of subranges, an extension could be prevented by an explicit "undef" caused by a <def,read-undef> on a non-overlapping lane. The list of location of such "undefs" should be provided in Undefs. The return value is a pair: the first element is VNInfo of the value that was extended (possibly nullptr), the second is a boolean value indicating whether an "undef" was encountered. If this range is live before Use in the basic block that starts at StartIdx, and there is no intervening "undef", extend it to be live up to Use, and return the pair {value, false}. If there is no segment before Use and there is no "undef" between StartIdx and Use, return {nullptr, false}. If there is an "undef" before Use, return {nullptr, true}.

Definition at line 549 of file LiveInterval.cpp.

References segmentSet.

Referenced by llvm::LiveRangeCalc::extend().

◆ extendInBlock() [2/2]

VNInfo * LiveRange::extendInBlock ( SlotIndex  StartIdx,
SlotIndex  Kill 
)

Simplified version of the above "extendInBlock", which assumes that no register lanes are undefined by <def,read-undef> operands.

If this range is live before Use in the basic block that starts at StartIdx, extend it to be live up to Use, and return the value. If there is no segment before Use, return nullptr.

Definition at line 558 of file LiveInterval.cpp.

References segmentSet.

◆ find() [1/2]

LiveRange::iterator LiveRange::find ( SlotIndex  Pos)

find - Return an iterator pointing to the first segment that ends after Pos, or end().

This is the same as advanceTo(begin(), Pos), but faster when searching large ranges.

If Pos is contained in a Segment, that segment is returned. If Pos is in a hole, the following Segment is returned. If Pos is beyond endIndex, end() is returned.

Definition at line 350 of file LiveInterval.cpp.

References llvm::partition_point(), and X.

Referenced by llvm::LiveRangeUpdater::add(), llvm::LiveIntervals::addKillFlags(), llvm::SIInstrInfo::convertToThreeAddress(), find(), FindSegmentContaining(), isLiveAtIndexes(), llvm::SplitAnalysis::isOriginalEndpoint(), liveAt(), overlaps(), Query(), and removeSegment().

◆ find() [2/2]

const_iterator llvm::LiveRange::find ( SlotIndex  Pos) const
inline

Definition at line 296 of file LiveInterval.h.

References find().

◆ findIndexesLiveAt()

template<typename Range , typename OutputIt >
bool llvm::LiveRange::findIndexesLiveAt ( Range &&  R,
OutputIt  O 
) const
inline

Stores indexes from the input index sequence R at which this LiveRange is live to the output O iterator.

R is a range of ascending sorted random access iterators to the input indexes. Indexes stored at O are ascending sorted so it can be used directly in the subsequent search (for example for subranges). Returns true if found at least one index.

Definition at line 628 of file LiveInterval.h.

References assert(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::SmallVectorTemplateCommon< T, typename >::end(), Idx, llvm::is_sorted(), and segments.

◆ FindSegmentContaining() [1/2]

iterator llvm::LiveRange::FindSegmentContaining ( SlotIndex  Idx)
inline

Return an iterator to the segment that contains the specified index, or end() if there is none.

Definition at line 436 of file LiveInterval.h.

References end(), find(), I, and Idx.

Referenced by getSegmentContaining(), getVNInfoAt(), getVNInfoBefore(), and moveAndTeeForMultiUse().

◆ FindSegmentContaining() [2/2]

const_iterator llvm::LiveRange::FindSegmentContaining ( SlotIndex  Idx) const
inline

Definition at line 441 of file LiveInterval.h.

References end(), find(), I, and Idx.

◆ flushSegmentSet()

void LiveRange::flushSegmentSet ( )

Flush segment set into the regular segment vector.

The method is to be called after the live range has been created, if use of the segment set was activated in the constructor of the live range.

Definition at line 793 of file LiveInterval.cpp.

References llvm::SmallVectorImpl< T >::append(), assert(), llvm::SmallVectorBase< Size_T >::empty(), segments, segmentSet, and verify().

◆ getNextValue()

VNInfo * llvm::LiveRange::getNextValue ( SlotIndex  Def,
VNInfo::Allocator VNInfoAllocator 
)
inline

getNextValue - Create a new value number and return it.

Def is the index of instruction that defines the value number.

Definition at line 331 of file LiveInterval.h.

References llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorBase< Size_T >::size(), and valnos.

◆ getNumValNums()

unsigned llvm::LiveRange::getNumValNums ( ) const
inline

◆ getSegmentContaining() [1/2]

Segment * llvm::LiveRange::getSegmentContaining ( SlotIndex  Idx)
inline

Return the live segment that contains the specified index, or null if there is none.

Definition at line 415 of file LiveInterval.h.

References end(), FindSegmentContaining(), I, and Idx.

◆ getSegmentContaining() [2/2]

const Segment * llvm::LiveRange::getSegmentContaining ( SlotIndex  Idx) const
inline

Return the segment that contains the specified index, or null if there is none.

Definition at line 408 of file LiveInterval.h.

References end(), FindSegmentContaining(), I, and Idx.

Referenced by llvm::X86InstrInfo::classifyLEAReg(), llvm::RISCVInstrInfo::convertToThreeAddress(), llvm::RegPressureTracker::getLiveThroughAt(), removeDeadSegment(), and llvm::LiveIntervals::shrinkToUses().

◆ getValNumInfo() [1/2]

VNInfo * llvm::LiveRange::getValNumInfo ( unsigned  ValNo)
inline

getValNumInfo - Returns pointer to the specified val#.

Definition at line 317 of file LiveInterval.h.

References valnos.

Referenced by containsValue(), join(), and print().

◆ getValNumInfo() [2/2]

const VNInfo * llvm::LiveRange::getValNumInfo ( unsigned  ValNo) const
inline

Definition at line 320 of file LiveInterval.h.

References valnos.

◆ getVNInfoAt()

VNInfo * llvm::LiveRange::getVNInfoAt ( SlotIndex  Idx) const
inline

◆ getVNInfoBefore()

VNInfo * llvm::LiveRange::getVNInfoBefore ( SlotIndex  Idx) const
inline

getVNInfoBefore - Return the VNInfo that is live up to but not necessarilly including Idx, or NULL.

Use this to find the reaching def used by an instruction at this SlotIndex position.

Definition at line 429 of file LiveInterval.h.

References end(), FindSegmentContaining(), I, and Idx.

Referenced by llvm::ConnectedVNInfoEqClasses::Classify(), llvm::ScheduleDAGMILive::computeCyclicCriticalPath(), getVRegDef(), llvm::LiveIntervals::hasPHIKill(), oneUseDominatesOtherUses(), llvm::SplitEditor::overlapIntv(), and llvm::ScheduleDAGMILive::updatePressureDiffs().

◆ hasAtLeastOneValue()

bool llvm::LiveRange::hasAtLeastOneValue ( ) const
inline

◆ isLiveAtIndexes()

bool LiveRange::isLiveAtIndexes ( ArrayRef< SlotIndex Slots) const

◆ isLocal()

bool llvm::LiveRange::isLocal ( SlotIndex  Start,
SlotIndex  End 
) const
inline

True iff this segment is a single segment that lies between the specified boundaries, exclusively.

Vregs live across a backedge are not considered local. The boundaries are expected to lie within an extended basic block, so vregs that are not live out should contain no holes.

Definition at line 518 of file LiveInterval.h.

References beginIndex(), End, and endIndex().

◆ isUndefIn()

bool llvm::LiveRange::isUndefIn ( ArrayRef< SlotIndex Undefs,
SlotIndex  Begin,
SlotIndex  End 
) const
inline

Returns true if there is an explicit "undef" between Begin End.

Definition at line 608 of file LiveInterval.h.

References llvm::any_of(), End, and Idx.

◆ isZeroLength()

bool llvm::LiveRange::isZeroLength ( SlotIndexes Indexes) const
inline

Returns true if the live range is zero length, i.e.

no live segments span instructions. It doesn't pay to spill such a range.

Definition at line 587 of file LiveInterval.h.

References llvm::SlotIndex::getBaseIndex(), llvm::SlotIndexes::getNextNonNullIndex(), and segments.

Referenced by llvm::VirtRegAuxInfo::weightCalcHelper().

◆ join()

void LiveRange::join ( LiveRange Other,
const int *  ValNoAssignments,
const int *  RHSValNoAssignments,
SmallVectorImpl< VNInfo * > &  NewVNInfo 
)

join - Join two live ranges (this, and other) together.

This applies mappings to the value numbers in the LHS/RHS ranges as specified. If the ranges are not joinable, this aborts.

Definition at line 629 of file LiveInterval.cpp.

References llvm::LiveRangeUpdater::add(), assert(), begin(), empty(), end(), llvm::SmallVectorImpl< T >::erase(), getNumValNums(), getValNumInfo(), I, llvm::VNInfo::id, llvm::Other, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorImpl< T >::resize(), segments, llvm::SmallVectorBase< Size_T >::size(), llvm::LiveRange::Segment::valno, valnos, and verify().

◆ liveAt()

bool llvm::LiveRange::liveAt ( SlotIndex  index) const
inline

◆ MergeSegmentsInAsValue()

void LiveRange::MergeSegmentsInAsValue ( const LiveRange RHS,
VNInfo LHSValNo 
)

Merge all of the live segments of a specific val# in RHS into this live range as the specified value number.

Merge all of the segments in RHS into this live range as the specified value number.

The segments in RHS are allowed to overlap with segments in the current range, it will replace the value numbers of the overlaped live segments with the specified value number.

The segments in RHS are allowed to overlap with segments in the current range, but only if the overlapping segments have the specified value number.

Definition at line 713 of file LiveInterval.cpp.

References llvm::LiveRangeUpdater::add(), llvm::LiveRange::Segment::end, RHS, and llvm::LiveRange::Segment::start.

◆ MergeValueInAsValue()

void LiveRange::MergeValueInAsValue ( const LiveRange RHS,
const VNInfo RHSValNo,
VNInfo LHSValNo 
)

MergeValueInAsValue - Merge all of the segments of a specific val# in RHS into this live range as the specified value number.

MergeValueInAsValue - Merge all of the live segments of a specific val# in RHS into this live range as the specified value number.

The segments in RHS are allowed to overlap with segments in the current range, but only if the overlapping segments have the specified value number.

The segments in RHS are allowed to overlap with segments in the current range, it will replace the value numbers of the overlaped segments with the specified value number.

Definition at line 725 of file LiveInterval.cpp.

References llvm::LiveRangeUpdater::add(), llvm::LiveRange::Segment::end, RHS, llvm::LiveRange::Segment::start, and llvm::LiveRange::Segment::valno.

◆ MergeValueNumberInto()

VNInfo * LiveRange::MergeValueNumberInto ( VNInfo V1,
VNInfo V2 
)

MergeValueNumberInto - This method is called when two value numbers are found to be equivalent.

MergeValueNumberInto - This method is called when two value nubmers are found to be equivalent.

This eliminates V1, replacing all segments with the V1 value number with the V2 value number. This can cause merging of V1/V2 values numbers and compaction of the value space.

Definition at line 738 of file LiveInterval.cpp.

References assert(), begin(), llvm::VNInfo::copyFrom(), end(), llvm::SmallVectorImpl< T >::erase(), I, llvm::VNInfo::id, segments, and std::swap().

◆ operator<()

bool llvm::LiveRange::operator< ( const LiveRange other) const
inline

Definition at line 600 of file LiveInterval.h.

References beginIndex().

◆ overlaps() [1/3]

bool llvm::LiveRange::overlaps ( const LiveRange other) const
inline

overlaps - Return true if the intersection of the two live ranges is not empty.

Definition at line 448 of file LiveInterval.h.

References begin(), empty(), and overlapsFrom().

◆ overlaps() [2/3]

bool LiveRange::overlaps ( const LiveRange Other,
const CoalescerPair CP,
const SlotIndexes Indexes 
) const

overlaps - Return true if the two ranges have overlapping segments that are not coalescable according to CP.

Overlapping segments where one range is defined by a coalescable copy are allowed.

Definition at line 430 of file LiveInterval.cpp.

References assert(), empty(), end(), find(), llvm::SlotIndexes::getInstructionFromIndex(), I, llvm::Other, and std::swap().

◆ overlaps() [3/3]

bool LiveRange::overlaps ( SlotIndex  Start,
SlotIndex  End 
) const

overlaps - Return true if the live range overlaps an interval specified by [Start, End).

Definition at line 473 of file LiveInterval.cpp.

References assert(), begin(), end(), End, I, and llvm::lower_bound().

◆ overlapsFrom()

bool LiveRange::overlapsFrom ( const LiveRange Other,
const_iterator  StartPos 
) const

overlapsFrom - Return true if the intersection of the two live ranges is not empty.

The specified iterator is a hint that we can begin scanning the Other range starting at I.

Definition at line 389 of file LiveInterval.cpp.

References assert(), begin(), empty(), end(), and std::swap().

Referenced by overlaps().

◆ print()

void LiveRange::print ( raw_ostream OS) const

◆ Query()

LiveQueryResult llvm::LiveRange::Query ( SlotIndex  Idx) const
inline

◆ removeSegment() [1/3]

LiveRange::iterator LiveRange::removeSegment ( iterator  I,
bool  RemoveDeadValNo = false 
)

Remove segment pointed to by iterator I from this range.

Definition at line 606 of file LiveInterval.cpp.

References llvm::SmallVectorImpl< T >::erase(), I, removeValNoIfDead(), and segments.

◆ removeSegment() [2/3]

void llvm::LiveRange::removeSegment ( Segment  S,
bool  RemoveDeadValNo = false 
)
inline

◆ removeSegment() [3/3]

void LiveRange::removeSegment ( SlotIndex  Start,
SlotIndex  End,
bool  RemoveDeadValNo = false 
)

Remove the specified interval from this live range.

Does nothing if interval is not part of this live range. Note that the interval must be within a single Segment in its entirety.

Definition at line 566 of file LiveInterval.cpp.

References assert(), end(), End, llvm::SmallVectorImpl< T >::erase(), find(), I, llvm::SmallVectorImpl< T >::insert(), removeValNoIfDead(), and segments.

Referenced by moveForSingleUse(), llvm::LiveIntervals::pruneValue(), removeDeadSegment(), removeSegment(), and llvm::LiveIntervals::shrinkToUses().

◆ removeValNo()

void LiveRange::removeValNo ( VNInfo ValNo)

removeValNo - Remove all the segments defined by the specified value#.

Also remove the value# from value# list.

Definition at line 621 of file LiveInterval.cpp.

References empty(), llvm::erase_if(), segments, and llvm::LiveRange::Segment::valno.

Referenced by llvm::LiveIntervals::removePhysRegDefAt(), llvm::LiveIntervals::removeVRegDefAt(), and stripValuesNotDefiningMask().

◆ removeValNoIfDead()

void LiveRange::removeValNoIfDead ( VNInfo ValNo)

Mark ValNo for deletion if no segments in this range use it.

Definition at line 614 of file LiveInterval.cpp.

References llvm::none_of(), and llvm::LiveRange::Segment::valno.

Referenced by removeSegment().

◆ RenumberValues()

void LiveRange::RenumberValues ( )

RenumberValues - Renumber all values in order of appearance and remove unused values.

RenumberValues - Renumber all values in order of appearance and delete the remaining unused values.

Definition at line 516 of file LiveInterval.cpp.

References assert(), llvm::SmallVectorImpl< T >::clear(), llvm::VNInfo::id, llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::VNInfo::isUnused(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), segments, llvm::SmallVectorBase< Size_T >::size(), and valnos.

Referenced by llvm::LiveRangeEdit::eliminateDeadDefs(), and llvm::SplitEditor::finish().

◆ size()

size_t llvm::LiveRange::size ( ) const
inline

◆ verify()

void LiveRange::verify ( ) const

Walk the range and assert if any invariants fail to hold.

Note that this is a no-op when asserts are disabled.

Definition at line 1058 of file LiveInterval.cpp.

References assert(), begin(), end(), I, llvm::SmallVectorBase< Size_T >::size(), and valnos.

Referenced by llvm::LiveRangeUpdater::flush(), flushSegmentSet(), and join().

◆ vni_begin() [1/2]

vni_iterator llvm::LiveRange::vni_begin ( )
inline

◆ vni_begin() [2/2]

const_vni_iterator llvm::LiveRange::vni_begin ( ) const
inline

◆ vni_end() [1/2]

vni_iterator llvm::LiveRange::vni_end ( )
inline

◆ vni_end() [2/2]

const_vni_iterator llvm::LiveRange::vni_end ( ) const
inline

◆ vnis() [1/2]

iterator_range< vni_iterator > llvm::LiveRange::vnis ( )
inline

Definition at line 230 of file LiveInterval.h.

References llvm::make_range(), vni_begin(), and vni_end().

Referenced by llvm::LiveIntervals::shrinkToUses().

◆ vnis() [2/2]

iterator_range< const_vni_iterator > llvm::LiveRange::vnis ( ) const
inline

Definition at line 234 of file LiveInterval.h.

References llvm::make_range(), vni_begin(), and vni_end().

Friends And Related Function Documentation

◆ LiveRangeUpdater

friend class LiveRangeUpdater
friend

Definition at line 675 of file LiveInterval.h.

Member Data Documentation

◆ segments

Segments llvm::LiveRange::segments

◆ segmentSet

std::unique_ptr<SegmentSet> llvm::LiveRange::segmentSet

◆ valnos

VNInfoList llvm::LiveRange::valnos

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