Detailed Description

template<typename V, typename Parent, int Dimension, typename RowMemory>
class Vc::Common::MemoryBase< V, Parent, Dimension, RowMemory >

Common interface to all Memory classes, independent of allocation on the stack or heap.

Parameters

V	The vector type you want to operate on. (e.g. float_v or uint_v)
Parent	This type is the complete type of the class that derives from MemoryBase.
Dimension	The number of dimensions the implementation provides.
RowMemory	Class to be used to work on a single row.

Definition at line 367 of file memorybase.h.

#include <Vc/Memory>

Inherits MemoryDimensionBase< V, Parent, Dimension, RowMemory >.

Public Types
typedef V::EntryType	EntryType
	The type of the scalar entries in the array.

Public Member Functions
size_t	entriesCount () const

size_t	vectorsCount () const

template<typename Flags = AlignedTag>
MemoryVectorIterator< V, Flags >	begin (Flags flags=Flags())
	Return a (vectorized) iterator to the start of this memory object.

template<typename Flags = AlignedTag>
MemoryVectorIterator< const V, Flags >	begin (Flags flags=Flags()) const
	const overload of the above

template<typename Flags = AlignedTag>
MemoryVectorIterator< V, Flags >	end (Flags flags=Flags())
	Return a (vectorized) iterator to the end of this memory object.

template<typename Flags = AlignedTag>
MemoryVectorIterator< const V, Flags >	end (Flags flags=Flags()) const
	const overload of the above

template<typename Flags = AlignedTag>
std::enable_if<!std::is_convertible< Flags, int >::value, vector_reference< Flags > >::type	vector (size_t i, Flags=Flags())

template<typename Flags = AlignedTag>
std::enable_if<!std::is_convertible< Flags, int >::value, const_vector_reference< Flags > >::type	vector (size_t i, Flags=Flags()) const
	Const overload of the above function. More...

template<typename Flags = UnalignedTag>
vector_reference< Flags >	vectorAt (size_t i, Flags flags=Flags())

template<typename Flags = UnalignedTag>
const_vector_reference< Flags >	vectorAt (size_t i, Flags flags=Flags()) const
	Const overload of the above function. More...

template<typename ShiftT , typename Flags = decltype(Unaligned)>
std::enable_if< std::is_convertible< ShiftT, int >::value, vector_reference< decltype(std::declval< Flags >)\|Unaligned)> >::type	vector (size_t i, ShiftT shift, Flags=Flags())

template<typename ShiftT , typename Flags = decltype(Unaligned)>
std::enable_if< std::is_convertible< ShiftT, int >::value, const_vector_reference< decltype(std::declval< Flags >)\|Unaligned)> >::type	vector (size_t i, ShiftT shift, Flags=Flags()) const
	Const overload of the above function.

template<typename Flags = AlignedTag>
vector_reference< Flags >	firstVector (Flags f=Flags())

template<typename Flags = AlignedTag>
const_vector_reference< Flags >	firstVector (Flags f=Flags()) const
	Const overload of the above function.

template<typename Flags = AlignedTag>
vector_reference< Flags >	lastVector (Flags f=Flags())

template<typename Flags = AlignedTag>
const_vector_reference< Flags >	lastVector (Flags f=Flags()) const
	Const overload of the above function.

void	setZero ()
	Zero the whole memory area.

template<typename U >
Parent &	operator= (U &&x)
	Assign a value to all vectors in the array.

template<typename P2 , typename RM >
Parent &	operator+= (const MemoryBase< V, P2, Dimension, RM > &rhs)
	(Inefficient) shorthand to add up two arrays.

template<typename P2 , typename RM >
Parent &	operator-= (const MemoryBase< V, P2, Dimension, RM > &rhs)
	(Inefficient) shorthand to subtract two arrays.

template<typename P2 , typename RM >
Parent &	operator*= (const MemoryBase< V, P2, Dimension, RM > &rhs)
	(Inefficient) shorthand to multiply two arrays.

template<typename P2 , typename RM >
Parent &	operator/= (const MemoryBase< V, P2, Dimension, RM > &rhs)
	(Inefficient) shorthand to divide two arrays.

Parent &	operator+= (EntryType rhs)
	(Inefficient) shorthand to add a value to an array.

Parent &	operator-= (EntryType rhs)
	(Inefficient) shorthand to subtract a value from an array.

Parent &	operator*= (EntryType rhs)
	(Inefficient) shorthand to multiply a value to an array.

Parent &	operator/= (EntryType rhs)
	(Inefficient) shorthand to divide an array with a value.

template<typename P2 , typename RM >
bool	operator== (const MemoryBase< V, P2, Dimension, RM > &rhs) const
	(Inefficient) shorthand compare equality of two arrays.

template<typename P2 , typename RM >
bool	operator!= (const MemoryBase< V, P2, Dimension, RM > &rhs) const
	(Inefficient) shorthand compare two arrays.

template<typename P2 , typename RM >
bool	operator< (const MemoryBase< V, P2, Dimension, RM > &rhs) const
	(Inefficient) shorthand compare two arrays.

template<typename P2 , typename RM >
bool	operator<= (const MemoryBase< V, P2, Dimension, RM > &rhs) const
	(Inefficient) shorthand compare two arrays.

template<typename P2 , typename RM >
bool	operator> (const MemoryBase< V, P2, Dimension, RM > &rhs) const
	(Inefficient) shorthand compare two arrays.

template<typename P2 , typename RM >
bool	operator>= (const MemoryBase< V, P2, Dimension, RM > &rhs) const
	(Inefficient) shorthand compare two arrays.

Member Function Documentation

◆ entriesCount()

size_t entriesCount ( ) const

inline

Returns: the number of scalar entries in the array. This function is optimized away if a constant size array is used.

Definition at line 392 of file memorybase.h.

◆ vectorsCount()

size_t vectorsCount ( ) const

inline

Returns: the number of vector entries that span the array. This function is optimized away if a constant size array is used.

Definition at line 397 of file memorybase.h.

◆ vector() [1/3]

std::enable_if<!std::is_convertible<Flags, int>::value, vector_reference<Flags> >::type vector	(	size_t	i,
		Flags	= `Flags()`
	)

inline

Parameters

i	Selects the offset, where the vector should be read.

Returns: a smart object to wrap the i-th vector in the memory.

The return value can be used as any other vector object. I.e. you can substitute something like

float_v a = ..., b = ...;

a += b;

with

mem.vector(i) += b;

This function ensures that only aligned loads and stores are used. Thus it only allows to access memory at fixed strides. If access to known offsets from the aligned vectors is needed the vector(size_t, int) function can be used.

Definition at line 444 of file memorybase.h.

◆ vector() [2/3]

std::enable_if<!std::is_convertible<Flags, int>::value, const_vector_reference<Flags> >::type vector	(	size_t	i,
		Flags	= `Flags()`
	)		const

inline

Const overload of the above function.

Parameters

i	Selects the offset, where the vector should be read.

Returns: a smart object to wrap the i-th vector in the memory.

Definition at line 458 of file memorybase.h.

◆ vectorAt() [1/2]

vector_reference<Flags> vectorAt	(	size_t	i,
		Flags	flags = `Flags()`
	)

inline

Returns: a smart object to wrap the vector starting from the i-th scalar entry in the memory.

Example:

Memory<float_v, N> mem;
mem.setZero();
for (int i = 0; i < mem.entriesCount(); i += float_v::Size) {
    mem.vectorAt(i) += b;
}

Parameters

i	Specifies the scalar entry from where the vector will be loaded/stored. I.e. the values scalar(i), scalar(i + 1), ..., scalar(i + V::Size - 1) will be read/overwritten.
flags	You must take care to determine whether an unaligned load/store is required. Per default an unaligned load/store is used. If `i` is a multiple of `V::Size` you may want to pass Vc::Aligned here.

Definition at line 483 of file memorybase.h.

◆ vectorAt() [2/2]

const_vector_reference<Flags> vectorAt	(	size_t	i,
		Flags	flags = `Flags()`
	)		const

inline

Const overload of the above function.

Returns: a smart object to wrap the vector starting from the i-th scalar entry in the memory.

Parameters

i	Specifies the scalar entry from where the vector will be loaded/stored. I.e. the values scalar(i), scalar(i + 1), ..., scalar(i + V::Size - 1) will be read/overwritten.
flags	You must take care to determine whether an unaligned load/store is required. Per default an unaligned load/store is used. If `i` is a multiple of `V::Size` you may want to pass Vc::Aligned here.

Definition at line 500 of file memorybase.h.

◆ vector() [3/3]

std::enable_if< std::is_convertible<ShiftT, int>::value, vector_reference<decltype(std::declval<Flags>) \| Unaligned)> >::type vector	(	size_t	i,
		ShiftT	shift,
		Flags	= `Flags()`
	)

inline

Returns: a smart object to wrap the i-th vector + shift in the memory.

This function ensures that only unaligned loads and stores are used. It allows to access memory at any location aligned to the entry type.

Parameters

i	Selects the memory location of the i-th vector. Thus if `V::Size` == 4 and `i` is set to 3 the base address for the load/store will be the 12th entry (same as `&mem`[12]).
shift	Shifts the base address determined by parameter `i` by `shift` many entries. Thus `vector(3, 1)` for `V::Size` == 4 will load/store the 13th - 16th entries (same as `&mem`[13]).

Note: Any shift value is allowed as long as you make sure it stays within bounds of the allocated memory. Shift values that are a multiple of V::Size will not result in aligned loads. You have to use the above vector(size_t) function for aligned loads instead.; Thus a simple way to access vectors randomly is to set i to 0 and use shift as the parameter to select the memory address:
// don't use:
mem.vector(i / V::Size, i % V::Size) += 1;
// instead use:
mem.vector(0, i) += 1;

Definition at line 537 of file memorybase.h.

◆ firstVector()

vector_reference<Flags> firstVector ( Flags f = Flags() )

inline

Returns: the first vector in the allocated memory.

This function is simply a shorthand for vector(0).

Definition at line 561 of file memorybase.h.

◆ lastVector()

vector_reference<Flags> lastVector ( Flags f = Flags() )

inline

Returns: the last vector in the allocated memory.

This function is simply a shorthand for vector(vectorsCount() - 1).

Definition at line 579 of file memorybase.h.

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

/home/mkretz/src/Vc-1.4/Vc/common/memorybase.h

Detailed Description

template<typename V, typename Parent, int Dimension, typename RowMemory> class Vc::Common::MemoryBase< V, Parent, Dimension, RowMemory >

Public Types

Public Member Functions

Member Function Documentation

◆ entriesCount()

◆ vectorsCount()

◆ vector() [1/3]

◆ vector() [2/3]

◆ vectorAt() [1/2]

◆ vectorAt() [2/2]

◆ vector() [3/3]

◆ firstVector()

◆ lastVector()

template<typename V, typename Parent, int Dimension, typename RowMemory>
class Vc::Common::MemoryBase< V, Parent, Dimension, RowMemory >