SparseSet - Fast set implementation for objects that can be identified by small unsigned keys. More...

#include "llvm/ADT/SparseSet.h"

Inheritance diagram for llvm::SparseSet< ValueT, KeyFunctorT, SparseT >:

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Public Types
using	value_type = ValueT

using	reference = ValueT &

using	const_reference = const ValueT &

using	pointer = ValueT *

using	const_pointer = const ValueT *

using	iterator = typename DenseT::iterator

using	const_iterator = typename DenseT::const_iterator

Public Member Functions
	SparseSet ()=default

	SparseSet (const SparseSet &)=delete

SparseSet &	operator= (const SparseSet &)=delete

	SparseSet (SparseSet &&)=default

void	setUniverse (unsigned U)
	setUniverse - Set the universe size which determines the largest key the set can hold.

const_iterator	begin () const

const_iterator	end () const

iterator	begin ()

iterator	end ()

bool	empty () const
	empty - Returns true if the set is empty.

size_type	size () const
	size - Returns the number of elements in the set.

void	clear ()
	clear - Clears the set.

iterator	findIndex (unsigned Idx)
	findIndex - Find an element by its index.

iterator	find (const KeyT &Key)
	find - Find an element by its key.

const_iterator	find (const KeyT &Key) const

bool	contains (const KeyT &Key) const
	Check if the set contains the given `Key`.

size_type	count (const KeyT &Key) const
	count - Returns 1 if this set contains an element identified by Key, 0 otherwise.

std::pair< iterator, bool >	insert (const ValueT &Val)
	insert - Attempts to insert a new element.

ValueT &	operator[] (const KeyT &Key)
	array subscript - If an element already exists with this key, return it.

ValueT	pop_back_val ()

iterator	erase (iterator I)
	erase - Erases an existing element identified by a valid iterator.

bool	erase (const KeyT &Key)
	erase - Erases an element identified by Key, if it exists.

Detailed Description

template<typename ValueT, typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>
class llvm::SparseSet< ValueT, KeyFunctorT, SparseT >

SparseSet - Fast set implementation for objects that can be identified by small unsigned keys.

SparseSet allocates memory proportional to the size of the key universe, so it is not recommended for building composite data structures. It is useful for algorithms that require a single set with fast operations.

Compared to DenseSet and DenseMap, SparseSet provides constant-time fast clear() and iteration as fast as a vector. The find(), insert(), and erase() operations are all constant time, and typically faster than a hash table. The iteration order doesn't depend on numerical key values, it only depends on the order of insert() and erase() operations. When no elements have been erased, the iteration order is the insertion order.

Compared to BitVector, SparseSet<unsigned> uses 8x-40x more memory, but offers constant-time clear() and size() operations as well as fast iteration independent on the size of the universe.

SparseSet contains a dense vector holding all the objects and a sparse array holding indexes into the dense vector. Most of the memory is used by the sparse array which is the size of the key universe. The SparseT template parameter provides a space/speed tradeoff for sets holding many elements.

When SparseT is uint32_t, find() only touches 2 cache lines, but the sparse array uses 4 x Universe bytes.

When SparseT is uint8_t (the default), find() touches up to 2+[N/256] cache lines, but the sparse array is 4x smaller. N is the number of elements in the set.

For sets that may grow to thousands of elements, SparseT should be set to uint16_t or uint32_t.

Template Parameters

ValueT	The type of objects in the set.
KeyFunctorT	A functor that computes an unsigned index from KeyT.
SparseT	An unsigned integer type. See above.

Definition at line 124 of file SparseSet.h.

Member Typedef Documentation

◆ const_iterator

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

using llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::const_iterator = typename DenseT::const_iterator

Definition at line 176 of file SparseSet.h.

◆ const_pointer

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

using llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::const_pointer = const ValueT *

Definition at line 147 of file SparseSet.h.

◆ const_reference

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

using llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::const_reference = const ValueT &

Definition at line 145 of file SparseSet.h.

◆ iterator

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

using llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::iterator = typename DenseT::iterator

Definition at line 175 of file SparseSet.h.

◆ pointer

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

using llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::pointer = ValueT *

Definition at line 146 of file SparseSet.h.

◆ reference

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

using llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::reference = ValueT &

Definition at line 144 of file SparseSet.h.

◆ value_type

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

using llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::value_type = ValueT

Definition at line 143 of file SparseSet.h.

Constructor & Destructor Documentation

◆ SparseSet() [1/3]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::SparseSet ( )

default

◆ SparseSet() [2/3]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::SparseSet ( const SparseSet< ValueT, KeyFunctorT, SparseT > & )

delete

◆ SparseSet() [3/3]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::SparseSet ( SparseSet< ValueT, KeyFunctorT, SparseT > && )

default

Member Function Documentation

◆ begin() [1/2]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

iterator llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::begin ( )

inline

Definition at line 180 of file SparseSet.h.

References llvm::Dense.

◆ begin() [2/2]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

const_iterator llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::begin ( ) const

inline

Definition at line 178 of file SparseSet.h.

References llvm::Dense.

Referenced by llvm::LivePhysRegs::begin(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::findIndex(), insertDeleteInstructions(), and llvm::LivePhysRegs::removeRegsInMask().

◆ clear()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

void llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::clear ( )

inline

clear - Clears the set.

This is a very fast constant time operation.

Definition at line 198 of file SparseSet.h.

References llvm::Dense.

Referenced by llvm::LivePhysRegs::clear(), llvm::LiveRegSet::clear(), llvm::LivePhysRegs::init(), and llvm::SpillPlacement::prepare().

◆ contains()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

bool llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::contains ( const KeyT & Key ) const

inline

Check if the set contains the given Key.

Parameters

Key	A valid key to find.

Definition at line 240 of file SparseSet.h.

References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end(), and llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::find().

Referenced by llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::count().

◆ count()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

size_type llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::count ( const KeyT & Key ) const

inline

count - Returns 1 if this set contains an element identified by Key, 0 otherwise.

Definition at line 245 of file SparseSet.h.

References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::contains().

Referenced by llvm::LivePhysRegs::available(), llvm::LivePhysRegs::contains(), llvm::RegPressureTracker::hasUntiedDef(), UpdatePredRedefs(), and llvm::SchedDFSImpl::visitPostorderNode().

◆ empty()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

bool llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::empty ( ) const

inline

empty - Returns true if the set is empty.

This is not the same as BitVector::empty().

Definition at line 187 of file SparseSet.h.

References llvm::Dense.

Referenced by llvm::LivePhysRegs::empty(), llvm::SpillPlacement::iterate(), and llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::setUniverse().

◆ end() [1/2]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

iterator llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end ( )

inline

Definition at line 181 of file SparseSet.h.

References llvm::Dense.

◆ end() [2/2]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

const_iterator llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end ( ) const

inline

Definition at line 179 of file SparseSet.h.

References llvm::Dense.

Referenced by llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::contains(), llvm::LiveRegSet::contains(), llvm::LivePhysRegs::end(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase(), llvm::LiveRegSet::erase(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::findIndex(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::insert(), insertDeleteInstructions(), llvm::LivePhysRegs::removeRegsInMask(), updatePhysDepsDownwards(), and updatePhysDepsUpwards().

◆ erase() [1/2]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

bool llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase ( const KeyT & Key )

inline

erase - Erases an element identified by Key, if it exists.

Parameters

Key	The key identifying the element to erase.

Returns: True when an element was erased, false if no element was found.

Definition at line 312 of file SparseSet.h.

References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::find(), and I.

◆ erase() [2/2]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

iterator llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase ( iterator I )

inline

erase - Erases an existing element identified by a valid iterator.

This invalidates all iterators, but erase() returns an iterator pointing to the next element. This makes it possible to erase selected elements while iterating over the set:

for (SparseSet::iterator I = Set.begin(); I != Set.end();) if (test(*I)) I = Set.erase(I); else ++I;

Note that end() changes when elements are erased, unlike std::list.

Definition at line 293 of file SparseSet.h.

References assert(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::begin(), llvm::Dense, llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end(), I, and llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::size().

Referenced by llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase(), insertDeleteInstructions(), llvm::LivePhysRegs::removeReg(), llvm::LivePhysRegs::removeRegsInMask(), updatePhysDepsDownwards(), updatePhysDepsUpwards(), and llvm::SchedDFSImpl::visitPostorderNode().

◆ find() [1/2]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

iterator llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::find ( const KeyT & Key )

inline

find - Find an element by its key.

Parameters

Key	A valid key to find.

Returns: An iterator to the element identified by key, or end().

Definition at line 229 of file SparseSet.h.

References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::findIndex().

Referenced by llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::contains(), llvm::LiveRegSet::contains(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase(), llvm::LiveRegSet::erase(), updatePhysDepsDownwards(), and updatePhysDepsUpwards().

◆ find() [2/2]

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

const_iterator llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::find ( const KeyT & Key ) const

inline

Definition at line 233 of file SparseSet.h.

References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::findIndex().

◆ findIndex()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

iterator llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::findIndex ( unsigned Idx )

inline

findIndex - Find an element by its index.

Parameters

Idx	A valid index to find.

Returns: An iterator to the element identified by key, or end().

Definition at line 208 of file SparseSet.h.

References assert(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::begin(), llvm::Dense, llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end(), Idx, and llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::size().

Referenced by llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::find(), and llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::insert().

◆ insert()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

std::pair< iterator, bool > llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::insert ( const ValueT & Val )

inline

insert - Attempts to insert a new element.

If Val is successfully inserted, return (I, true), where I is an iterator pointing to the newly inserted element.

If the set already contains an element with the same key as Val, return (I, false), where I is an iterator pointing to the existing element.

Insertion invalidates all iterators.

Definition at line 257 of file SparseSet.h.

References llvm::Dense, llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::end(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::findIndex(), I, Idx, and llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::size().

Referenced by llvm::LivePhysRegs::addReg(), llvm::LiveRegSet::insert(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::operator[](), and UpdatePredRedefs().

◆ operator=()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

SparseSet & llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::operator= ( const SparseSet< ValueT, KeyFunctorT, SparseT > & )

delete

◆ operator[]()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

ValueT & llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::operator[] ( const KeyT & Key )

inline

array subscript - If an element already exists with this key, return it.

Otherwise, automatically construct a new value from Key, insert it, and return the newly inserted element.

Definition at line 270 of file SparseSet.h.

References llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::insert().

◆ pop_back_val()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

ValueT llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::pop_back_val ( )

inline

Definition at line 274 of file SparseSet.h.

References llvm::Dense.

Referenced by llvm::SpillPlacement::iterate().

◆ setUniverse()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

void llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::setUniverse ( unsigned U )

inline

setUniverse - Set the universe size which determines the largest key the set can hold.

The universe must be sized before any elements can be added.

Parameters

U	Universe size. All object keys must be less than U.

Definition at line 160 of file SparseSet.h.

References assert(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::empty(), and llvm::safe_calloc().

Referenced by llvm::LiveRegSet::init(), llvm::LivePhysRegs::init(), llvm::LivePhysRegs::LivePhysRegs(), llvm::SchedDFSImpl::SchedDFSImpl(), and UpdatePredRedefs().

◆ size()

template<typename ValueT , typename KeyFunctorT = identity<unsigned>, typename SparseT = uint8_t>

size_type llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::size ( ) const

inline

size - Returns the number of elements in the set.

This is not the same as BitVector::size() which returns the size of the universe.

Definition at line 194 of file SparseSet.h.

References llvm::Dense.

Referenced by llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::erase(), llvm::SchedDFSImpl::finalize(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::findIndex(), llvm::SparseSet< ValueT, KeyFunctorT, SparseT >::insert(), and llvm::LiveRegSet::size().

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

include/llvm/ADT/SparseSet.h

Public Types

Public Member Functions

Detailed Description

Member Typedef Documentation

◆ const_iterator

◆ const_pointer

◆ const_reference

◆ iterator

◆ pointer

◆ reference

◆ value_type

Constructor & Destructor Documentation

◆ SparseSet() [1/3]

◆ SparseSet() [2/3]

◆ SparseSet() [3/3]

Member Function Documentation

◆ begin() [1/2]

◆ begin() [2/2]

◆ clear()

◆ contains()

◆ count()

◆ empty()

◆ end() [1/2]

◆ end() [2/2]

◆ erase() [1/2]

◆ erase() [2/2]

◆ find() [1/2]

◆ find() [2/2]

◆ findIndex()

◆ insert()

◆ operator=()

◆ operator[]()

◆ pop_back_val()

◆ setUniverse()

◆ size()