Detailed Description

template<typename T, size_t N, typename V, size_t Wt>
class Vc::SimdMaskArray< T, N, V, Wt >

Data-parallel mask type with user-defined number of boolean elements.

Template Parameters

T	The value type of the corresponding SimdArray. Depending on the target platform this type determines a different bit representation to work most efficient with SimdArray types instantiated for `T`.
N	The number of boolean elements to store and process concurrently. You can choose an arbitrary number, though not every number is a good idea. Generally, a power of two value or the sum of two power of two values might work efficiently, though this depends a lot on the target system.
V	Don't change the default value unless you really know what you are doing. This type is set to the underlying native Vc::Vector type used in the implementation of the type. Having it as part of the type name guards against some cases of ODR violations (i.e. linking incompatible translation units / libraries).
Wt	Don't ever change the default value. This parameter is an unfortunate implementation detail shining through.

Definition at line 86 of file fwddecl.h.

#include <Vc/SimdArray>

Public Types
using	value_type = typename storage_type0::EntryType
	The `EntryType` of masks is always `bool`, independent of `T`. More...

using	MaskType = mask_type
	Construct a zero-initialized vector object. More...

using	VectorEntryType = vectorentry_type
	The `VectorEntryType`, in contrast to `EntryType`, reveals information about the SIMD implementation. More...

using	EntryType = value_type
	The `EntryType` of masks is always `bool`, independent of `T`. More...

using	EntryReference = Vc::Detail::ElementReference< SimdMaskArray >
	The reference wrapper type used for accessing individual mask components. More...

using	Vector = fixed_size_simd< T, N >
	An alias for the corresponding SimdArray type.

Public Member Functions
	SimdMaskArray ()=default
	Construct a zero-initialized vector object. More...

	SimdMaskArray (VectorSpecialInitializerOne one)
	Initialize the new mask object to one (`true`).

	SimdMaskArray (VectorSpecialInitializerZero zero)
	Zero-initialize the new mask object (`false`).

	SimdMaskArray (bool b)
	Broadcast constructor. More...

bool	operator== (const SimdMaskArray &mask) const
	Returns whether the two masks are equal in all components. More...

bool	operator!= (const SimdMaskArray &mask) const
	Returns whether the two masks are different in at least one component. More...

fixed_size_simd_mask< T, N >	operator! () const
	Returns a mask with inverted components.

SimdMaskArray &	operator &= (const SimdMaskArray &rhs)

SimdMaskArray &	operator\|= (const SimdMaskArray &rhs)
	Modifies the mask using an `OR` operation with `mask`.

SimdMaskArray &	operator^= (const SimdMaskArray &rhs)
	Modifies the mask using an `XOR` operation with `mask`.

fixed_size_simd_mask< T, N >	operator & (const SimdMaskArray &rhs) const

fixed_size_simd_mask< T, N >	operator\| (const SimdMaskArray &rhs) const
	Returns the component-wise application of a binary `OR` to `mask`.

fixed_size_simd_mask< T, N >	operator^ (const SimdMaskArray &rhs) const
	Returns the component-wise application of a binary `XOR` to `mask`.

fixed_size_simd_mask< T, N >	operator && (const SimdMaskArray &rhs) const

fixed_size_simd_mask< T, N >	operator\|\| (const SimdMaskArray &rhs) const
	Returns the component-wise application of a logical `OR` to `mask`.

bool	isFull () const
	Returns a logical `AND` of all components.

bool	isNotEmpty () const
	Returns a logical `OR` of all components.

bool	isEmpty () const
	Returns `true` if components are `false`, `false` otherwise.

bool	isMix () const
	Returns `!isFull() && !isEmpty()`.

int	toInt () const
	Convert the boolean components of the mask into bits of an integer. More...

reference	operator[] (size_t index) noexcept
	Return a smart reference to the boolean element at index `index`. More...

value_type	operator[] (size_t index) const noexcept
	Return a copy of the boolean element at index `index`. More...

int	count () const
	Returns how many components of the mask are `true`.

int	firstOne () const
	Returns the index of the first one in the mask. More...

fixed_size_simd_mask< T, N >	shifted (int amount) const
	Returns a mask with components shifted by `amount` places.

new/delete overloads for correct alignment
void *	operator new (size_t size)
	Allocates correctly aligned memory.

void *	operator new (size_t, void *p)
	Returns `p`.

void *	operator new[] (size_t size)
	Allocates correctly aligned memory.

void *	operator new[] (size_t, void *p)
	Returns `p`.

void	operator delete (void *ptr, size_t)
	Frees aligned memory.

void	operator delete (void , void )
	Does nothing.

void	operator delete[] (void *ptr, size_t)
	Frees aligned memory.

void	operator delete[] (void , void )
	Does nothing.

Loads & Stores
template<typename Flags = DefaultLoadTag>
	SimdMaskArray (const bool *mem, Flags f=Flags())
	Load N boolean values from the consecutive addresses starting at `mem`. More...

void	load (const bool *mem)
	Load N boolean values from the consecutive addresses starting at `mem`. More...

template<typename Flags >
void	load (const bool *mem, Flags f)
	Load N boolean values from the consecutive addresses starting at `mem`. More...

void	store (bool *mem) const
	Store N boolean values to the consecutive addresses starting at `mem`. More...

template<typename Flags >
void	store (bool *mem, Flags f) const
	Store N boolean values to the consecutive addresses starting at `mem`. More...

Static Public Member Functions
static constexpr std::size_t	size ()
	Returns the number of boolean components ( \(\mathcal{W}_\mathtt{T}\)) in a mask of this type. More...

static fixed_size_simd_mask< T, N >	Zero ()
	Creates a new mask object initialized to zero/`false`. More...

static fixed_size_simd_mask< T, N >	One ()
	Creates a mask object initialized to one/`true`. More...

template<typename G >
static fixed_size_simd_mask< T, N >	generate (const G &gen)
	Generate a mask object from booleans returned from the function `gen`.

Static Public Attributes
static constexpr std::size_t	Size = size()
	Returns the number of boolean components ( \(\mathcal{W}_\mathtt{T}\)) in a mask of this type. More...

static constexpr std::size_t	MemoryAlignment
	Specifies the alignment requirement for aligned load and store calls for objects of this mask type. More...

Member Typedef Documentation

◆ value_type

using value_type = typename storage_type0::EntryType

The EntryType of masks is always bool, independent of T.

Definition at line 358 of file simdmaskarray.h.

◆ MaskType

using MaskType = mask_type

Construct a zero-initialized vector object.

This constructor follows the behavior of the underlying bool type in that the expression bool() zero-initializes the object (to false). On the other hand the variable x in bool x; is uninitialized. Since, for class types, both expressions call the default constructor Mask<T> x must zero-initialize x as well.

Definition at line 360 of file simdmaskarray.h.

◆ VectorEntryType

using VectorEntryType = vectorentry_type

The VectorEntryType, in contrast to EntryType, reveals information about the SIMD implementation.

This type is useful for the sizeof operator in generic functions.

Definition at line 362 of file simdmaskarray.h.

◆ EntryType

using EntryType = value_type

The EntryType of masks is always bool, independent of T.

Definition at line 364 of file simdmaskarray.h.

◆ EntryReference

using EntryReference = Vc::Detail::ElementReference<SimdMaskArray>

The reference wrapper type used for accessing individual mask components.

Definition at line 366 of file simdmaskarray.h.

Constructor & Destructor Documentation

◆ SimdMaskArray() [1/3]

SimdMaskArray ( )

default

Construct a zero-initialized vector object.

This constructor follows the behavior of the underlying bool type in that the expression bool() zero-initializes the object (to false). On the other hand the variable x in bool x; is uninitialized. Since, for class types, both expressions call the default constructor Mask<T> x must zero-initialize x as well.

◆ SimdMaskArray() [2/3]

SimdMaskArray ( bool b )

inlineexplicit

Broadcast constructor.

Set all components of the new mask object to b.

Parameters

b	Determines the initial state of the mask.

Definition at line 435 of file simdmaskarray.h.

◆ SimdMaskArray() [3/3]

SimdMaskArray	(	const bool *	mem,
		Flags	f = `Flags()`
	)

inlineexplicit

Load N boolean values from the consecutive addresses starting at mem.

Parameters

mem	A pointer to an array of booleans.
f	A combination of flags to modify specific behavior of the load.

Definition at line 458 of file simdmaskarray.h.

Member Function Documentation

◆ size()

static constexpr std::size_t size ( )

inlinestatic

Returns the number of boolean components ( \(\mathcal{W}_\mathtt{T}\)) in a mask of this type.

The size of the mask. I.e. the number of boolean entries in the mask. Do not make any assumptions about the size of masks.

In addition, you can easily use if clauses that compare sizes. The compiler can statically evaluate and fully optimize dead code away (very much like #ifdef, but with syntax checking).

Returns: The number of components (i.e. \(\mathcal{W}_\mathtt{T}\)) objects of this mask type store and manipulate.

Definition at line 344 of file simdmaskarray.h.

◆ Zero()

static fixed_size_simd_mask<T, N> Zero ( )

inlinestatic

Creates a new mask object initialized to zero/false.

Returns: A mask object with zero-initialized components.

Definition at line 438 of file simdmaskarray.h.

◆ One()

static fixed_size_simd_mask<T, N> One ( )

inlinestatic

Creates a mask object initialized to one/true.

Returns: A mask object with components initialized to true.

Definition at line 443 of file simdmaskarray.h.

◆ load() [1/2]

void load ( const bool * mem )

inline

Load N boolean values from the consecutive addresses starting at mem.

Parameters

mem	A pointer to an array of booleans.

Definition at line 468 of file simdmaskarray.h.

◆ load() [2/2]

void load	(	const bool *	mem,
		Flags	f
	)

inline

Load N boolean values from the consecutive addresses starting at mem.

Parameters

mem	A pointer to an array of booleans.
f	A combination of flags to modify specific behavior of the load.

Definition at line 480 of file simdmaskarray.h.

◆ store() [1/2]

void store ( bool * mem ) const

inline

Store N boolean values to the consecutive addresses starting at mem.

Parameters

mem	A pointer to an array of booleans.

Definition at line 491 of file simdmaskarray.h.

◆ store() [2/2]

void store	(	bool *	mem,
		Flags	f
	)		const

inline

Store N boolean values to the consecutive addresses starting at mem.

Parameters

mem	A pointer to an array of booleans.
f	A combination of flags to modify specific behavior of the load.

Definition at line 503 of file simdmaskarray.h.

◆ operator==()

bool operator== ( const SimdMaskArray< T, N, V, Wt > & mask ) const

inline

Returns whether the two masks are equal in all components.

Parameters

mask	The other mask to compare against.

Returns: A scalar boolean value that says whether all components of the two masks are equal.

Note: If you expected a behavior similar to the compare operator of Vc::Vector, consider that the bitwise operators already implement such functionality. There is little use, typically, in having a == b return the same as a ^ b. In general, it is more useful to query all_of(a ^ b) which is the same as this equality operator.

Definition at line 511 of file simdmaskarray.h.

◆ operator!=()

bool operator!= ( const SimdMaskArray< T, N, V, Wt > & mask ) const

inline

Returns whether the two masks are different in at least one component.

Parameters

mask	The other mask to compare against.

Returns: A scalar boolean value that says whether at least one component of the two masks is different.

Note: (a == b) == !(a != b) holds

See also: Mask::operator==(const Mask &)

Definition at line 516 of file simdmaskarray.h.

◆ toInt()

int toInt ( ) const

inline

Convert the boolean components of the mask into bits of an integer.

Returns: An int where each bit corresponds to the boolean value in the mask.

For example, the mask [true, false, false, true] results in a 9 (in binary: 1001).

Definition at line 591 of file simdmaskarray.h.

◆ operator[]() [1/2]

reference operator[] ( size_t index )

inlinenoexcept

Return a smart reference to the boolean element at index index.

Parameters

index The element index to be accessed.

Returns: A temporary smart reference object which acts as much as an lvalue reference as possible.

Definition at line 627 of file simdmaskarray.h.

◆ operator[]() [2/2]

value_type operator[] ( size_t index ) const

inlinenoexcept

Return a copy of the boolean element at index index.

Parameters

index The element index to be accessed.

Returns: A temporary boolean object with the value of the element at index index.

Definition at line 639 of file simdmaskarray.h.

◆ firstOne()

int firstOne ( ) const

inline

Returns the index of the first one in the mask.

Returns: the index of the first component that is true.

Warning: The return value is undefined if the mask is empty.

Thus, unless none_of(mask), mask[mask.firstOne()] == true holds and mask[i] == false for all i < mask.firstOne().

Definition at line 648 of file simdmaskarray.h.

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

/home/mkretz/src/Vc-1.4/Vc/fwddecl.h
/home/mkretz/src/Vc-1.4/Vc/common/simdmaskarray.h

Detailed Description

template<typename T, size_t N, typename V, size_t Wt> class Vc::SimdMaskArray< T, N, V, Wt >

Public Types

Public Member Functions

Static Public Member Functions

Static Public Attributes

Member Typedef Documentation

◆ value_type

◆ MaskType

◆ VectorEntryType

◆ EntryType

◆ EntryReference

Constructor & Destructor Documentation

◆ SimdMaskArray() [1/3]

◆ SimdMaskArray() [2/3]

◆ SimdMaskArray() [3/3]

Member Function Documentation

◆ size()

◆ Zero()

◆ One()

◆ load() [1/2]

◆ load() [2/2]

◆ store() [1/2]

◆ store() [2/2]

◆ operator==()

◆ operator!=()

◆ toInt()

◆ operator[]() [1/2]

◆ operator[]() [2/2]

◆ firstOne()

template<typename T, size_t N, typename V, size_t Wt>
class Vc::SimdMaskArray< T, N, V, Wt >