Predicate register view. More...

#include <vec_pred_reg.hh>

Public Types
using	Container
	Container type alias.

Public Member Functions
	VecPredRegT (Container &c)

template<bool Condition = !Const>
std::enable_if_t< Condition >	reset ()
	Reset the register to an all-false value.

template<bool Condition = !Const>
std::enable_if_t< Condition >	set ()
	Reset the register to an all-true value.

template<bool Condition = !Const>
std::enable_if_t< Condition, MyClass & >	operator= (const MyClass &that)

const bool &	operator[] (size_t idx) const

template<bool Condition = !Const>
std::enable_if_t< Condition, bool & >	operator[] (size_t idx)

uint8_t	getRaw (size_t idx) const
	Return an element of the predicate register as it appears in the raw (untyped) internal representation.

template<bool Condition = !Const>
std::enable_if_t< Condition >	setRaw (size_t idx, uint8_t val)
	Write a raw value in an element of the predicate register.

template<typename VE2, size_t NE2, bool P2, bool C2>
bool	operator== (const VecPredRegT< VE2, NE2, P2, C2 > &that) const
	Equality operator, required to compare thread contexts.

template<typename VE2, size_t NE2, bool P2, bool C2>
bool	operator!= (const VecPredRegT< VE2, NE2, P2, C2 > &that) const
	Inequality operator, required to compare thread contexts.

template<bool MC>
bool	firstActive (const VecPredRegT< VecElem, NumElems, Packed, MC > &mask, size_t actual_num_elems) const
	Returns true if the first active element of the register is true.

template<bool MC>
bool	noneActive (const VecPredRegT< VecElem, NumElems, Packed, MC > &mask, size_t actual_num_elems) const
	Returns true if there are no active elements in the register.

template<bool MC>
bool	lastActive (const VecPredRegT< VecElem, NumElems, Packed, MC > &mask, size_t actual_num_elems) const
	Returns true if the last active element of the register is true.

Protected Types
using	MyClass = VecPredRegT<VecElem, NumElems, Packed, Const>

Protected Attributes
Container &	container
	Container corresponding to this view.

Static Protected Attributes
static constexpr size_t	NUM_BITS
	Size of the register in bits.

Friends
std::ostream &	operator<< (std::ostream &os, const MyClass &p)

Detailed Description

template<typename VecElem, size_t NumElems, bool Packed, bool Const>
class gem5::VecPredRegT< VecElem, NumElems, Packed, Const >

Predicate register view.

This generic class implements the View in an MVC pattern, similarly to

See also: VecRegT. Since predicates are mainly used in conjunction with vectors to specify which lanes are active in a vector operation, the class is templated on the vector element type to simplify ISA definitions.

Template Parameters

VecElem	Type of the vector elements.
NumElems	Number of vector elements making up the view.
Packed	True if the predicate register relies on a packed representation, i.e. adjacent bits refer to different vector elements irrespective of the vector element size (e.g. this is the case for AVX-512). If false, the predicate register relies on an unpacked representation, where each bit refers to the corresponding byte in a vector register (e.g. this is the case for ARM SVE).
Const	True if the underlying container can be modified through the view.

Definition at line 73 of file vec_pred_reg.hh.

Member Typedef Documentation

◆ Container

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

using gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::Container

Initial value:

 typename std::conditional_t<
        Const,
        const VecPredRegContainer<NUM_BITS, Packed>,
        VecPredRegContainer<NUM_BITS, Packed>>

Container type alias.

Definition at line 82 of file vec_pred_reg.hh.

◆ MyClass

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

using gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::MyClass = VecPredRegT<VecElem, NumElems, Packed, Const>

protected

Definition at line 89 of file vec_pred_reg.hh.

Constructor & Destructor Documentation

◆ VecPredRegT()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::VecPredRegT ( Container & c )

inline

Definition at line 94 of file vec_pred_reg.hh.

Member Function Documentation

◆ firstActive()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<bool MC>

bool gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::firstActive	(	const VecPredRegT< VecElem, NumElems, Packed, MC > &	mask,
		size_t	actual_num_elems ) const

inline

Returns true if the first active element of the register is true.

Parameters

mask	Input mask used to filter the predicates to be tested.
actual_num_elems	Actual number of vector elements considered for the test (corresponding to the current vector length).

Definition at line 175 of file vec_pred_reg.hh.

◆ getRaw()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

uint8_t gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::getRaw ( size_t idx ) const

inline

Return an element of the predicate register as it appears in the raw (untyped) internal representation.

Definition at line 128 of file vec_pred_reg.hh.

◆ lastActive()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<bool MC>

bool gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::lastActive	(	const VecPredRegT< VecElem, NumElems, Packed, MC > &	mask,
		size_t	actual_num_elems ) const

inline

Returns true if the last active element of the register is true.

Parameters

mask	Input mask used to filter the predicates to be tested.
actual_num_elems	Actual number of vector elements considered for the test (corresponding to the current vector length).

Definition at line 211 of file vec_pred_reg.hh.

◆ noneActive()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<bool MC>

bool gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::noneActive	(	const VecPredRegT< VecElem, NumElems, Packed, MC > &	mask,
		size_t	actual_num_elems ) const

inline

Returns true if there are no active elements in the register.

Parameters

mask	Input mask used to filter the predicates to be tested.
actual_num_elems	Actual number of vector elements considered for the test (corresponding to the current vector length).

Definition at line 193 of file vec_pred_reg.hh.

◆ operator!=()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<typename VE2, size_t NE2, bool P2, bool C2>

bool gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::operator!= ( const VecPredRegT< VE2, NE2, P2, C2 > & that ) const

inline

Inequality operator, required to compare thread contexts.

Definition at line 154 of file vec_pred_reg.hh.

◆ operator=()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<bool Condition = !Const>

std::enable_if_t< Condition, MyClass & > gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::operator= ( const MyClass & that )

inline

Definition at line 106 of file vec_pred_reg.hh.

◆ operator==()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<typename VE2, size_t NE2, bool P2, bool C2>

bool gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::operator== ( const VecPredRegT< VE2, NE2, P2, C2 > & that ) const

inline

Equality operator, required to compare thread contexts.

Definition at line 146 of file vec_pred_reg.hh.

Referenced by gem5::VecPredRegT< VecElem, NumVecElemPerVecReg, false, false >::operator!=().

◆ operator[]() [1/2]

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<bool Condition = !Const>

std::enable_if_t< Condition, bool & > gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::operator[] ( size_t idx )

inline

Definition at line 120 of file vec_pred_reg.hh.

◆ operator[]() [2/2]

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

const bool & gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::operator[] ( size_t idx ) const

inline

Definition at line 113 of file vec_pred_reg.hh.

Referenced by gem5::VecPredRegT< VecElem, NumVecElemPerVecReg, false, false >::lastActive().

◆ reset()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<bool Condition = !Const>

std::enable_if_t< Condition > gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::reset ( )

inline

Reset the register to an all-false value.

Definition at line 98 of file vec_pred_reg.hh.

◆ set()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<bool Condition = !Const>

std::enable_if_t< Condition > gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::set ( )

inline

Reset the register to an all-true value.

Definition at line 102 of file vec_pred_reg.hh.

◆ setRaw()

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

template<bool Condition = !Const>

std::enable_if_t< Condition > gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::setRaw	(	size_t	idx,
		uint8_t	val )

inline

Write a raw value in an element of the predicate register.

Definition at line 137 of file vec_pred_reg.hh.

Friends And Related Symbol Documentation

◆ operator<<

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

std::ostream & operator<<	(	std::ostream &	os,
		const MyClass &	p )

friend

Definition at line 159 of file vec_pred_reg.hh.

Member Data Documentation

◆ container

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

Container& gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::container

protected

Container corresponding to this view.

Definition at line 91 of file vec_pred_reg.hh.

Referenced by gem5::VecPredRegT< VecElem, NumVecElemPerVecReg, false, false >::operator=(), and gem5::VecPredRegT< VecElem, NumVecElemPerVecReg, false, false >::operator==().

◆ NUM_BITS

template<typename VecElem, size_t NumElems, bool Packed, bool Const>

size_t gem5::VecPredRegT< VecElem, NumElems, Packed, Const >::NUM_BITS

staticconstexprprotected

Initial value:

= Packed ? NumElems :

sizeof(VecElem) * NumElems

gem5::ArmISA::VecElem

uint32_t VecElem

Definition vec.hh:63

Size of the register in bits.

Definition at line 77 of file vec_pred_reg.hh.

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

arch/generic/vec_pred_reg.hh

Public Types

Public Member Functions

Protected Types

Protected Attributes

Static Protected Attributes

Friends

Detailed Description

Member Typedef Documentation

◆ Container

◆ MyClass

Constructor & Destructor Documentation

◆ VecPredRegT()

Member Function Documentation

◆ firstActive()

◆ getRaw()

◆ lastActive()

◆ noneActive()

◆ operator!=()

◆ operator=()

◆ operator==()

◆ operator[]() [1/2]

◆ operator[]() [2/2]

◆ reset()

◆ set()

◆ setRaw()

Friends And Related Symbol Documentation

◆ operator<<

Member Data Documentation

◆ container

◆ NUM_BITS