std::experimental::simd_mask<T,Abi>::simd_mask

 

C++

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Technical specifications

Symbols index

External libraries

 

Experimental

Technical Specification

Filesystem library (filesystem TS)

Library fundamentals (library fundamentals TS)

Library fundamentals 2 (library fundamentals TS v2)

Library fundamentals 3 (library fundamentals TS v3)

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Extensions for parallelism 2 (parallelism TS v2)

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Extensions for concurrency 2 (concurrency TS v2)

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Extensions for parallelism v2

Parallel exceptions
exception_list
Additional execution policies
execution::vector_policy	execution::unsequenced_policy
Algorithms
induction reductionreduction_plusreduction_minusreduction_multiplies	reduction_bit_andreduction_bit_orreduction_bit_xorreduction_minreduction_max	for_loopfor_loop_stridedfor_loop_nfor_loop_n_strided
execution::no_vec
execution::ordered_update_t
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task_block
task_cancelled_exception
define_task_blockdefine_task_block_restore_thread
Data-parallel vectors

 

SIMD library

Main classes
simd	simd_mask
ABI tags
simd_abi::scalar simd_abi::fixed_size	simd_abi::native simd_abi::compatible	simd_abi::max_fixed_size simd_abi::deduce
Alignment tags
element_aligned_tagelement_aligned	vector_aligned_tagvector_aligned	overaligned_tagoveraligned
Where expression
where	where_expression	const_where_expression
Casts
simd_caststatic_simd_cast	to_fixed_sizeto_compatibleto_native	splitsplit_by concat
Algorithms
min max	minmax clamp
Reduction
reducehminhmax
Mask reduction
all_ofany_ofnone_ofsome_of	popcount find_first_setfind_last_set
Traits
is_simdis_simd_mask is_abi_tag is_simd_flag_type	simd_size memory_alignment rebind_simdresize_simd
Math functions

 

std::experimental::simd_mask

Member functions
simd_mask size	copy_from      copy_to	operator[] operator!
Non-member functions
operator==operator!=      operator&&operator||	operator&operator|operator^	operator&=operator|=operator^=

 

simd_mask() noexcept = default;	(1)	(parallelism TS v2)
explicit simd_mask( bool value ) noexcept;	(2)	(parallelism TS v2)
template< class U > simd_mask( const simd_mask<U, simd_abi::fixed_size<size()>>& other ) noexcept;	(3)	(parallelism TS v2)
template< class U, class Flags > simd_mask( const bool* mem, Flags flags );	(4)	(parallelism TS v2)
simd_mask( const simd_mask& other ) noexcept = default;	(5)	(parallelism TS v2) (implicitly declared)
simd_mask( simd_mask&& other ) noexcept = default;	(6)	(parallelism TS v2) (implicitly declared)

1) Constructs a simd_mask using default initialization (constructed without initializer) or value initialization (constructed with an empty initializer).

2) The broadcast constructor constructs a simd_mask with all values initialized to value.

3) Constructs a simd_mask where the i-th element is initialized to other[i] for all i in the range of [​0​, size()). This overload participates in overload resolution only if Abi is simd_abi::fixed_size<size()>.

4) The load constructor constructs a simd_mask where the i-th element is initialized to mem[i] for all i in the range of [​0​, size()).

5,6) Implicitly declared copy and move constructors. Constructs a simd_mask where each element is initialized from the values of the elements in other.

Parameters

value	-	the value used for initialization of all simd_mask elements
other	-	another simd_mask to copy from
mem	-	a pointer into an array where [mem, mem + size()) is a valid range
flags	-	if of type vector_aligned_tag, the load constructor may assume mem to point to storage aligned by memory_alignment_v<simd_mask>
Type requirements
- is_simd_flag_type_v<Flags> must be true.

Example

Run this code

#include <algorithm>
#include <cstddef>
#include <experimental/simd>
#include <iostream>
namespace stdx = std::experimental;
 
int main()
{
    [[maybe_unused]]
    stdx::native_simd_mask<int> a;       / uninitialized
    stdx::native_simd_mask<int> b(true); / all elements initialized with true
    stdx::native_simd_mask<int> c{};     / all elements initialized with false
 
    alignas(stdx::memory_alignment_v<stdx::native_simd_mask<int>>)
        std::array<bool, stdx::native_simd_mask<int>::size() * 2> mem = {};
    std::ranges::generate(mem, [i{0}] mutable -> bool { return i++ & 1; });
 
    stdx::native_simd_mask<int> d(&mem[0], stdx::vector_aligned);  / {0, 1, 0, 1, ...}
    stdx::native_simd_mask<int> e(&mem[1], stdx::element_aligned); / {1, 0, 1, 0, ...}
 
    const auto xored = b ^ c ^ d ^ e;
 
    for (std::size_t i{}; i != xored.size(); ++i)
        std::cout << xored[i] << ' ';
    std::cout << '\n';
}

Possible output:

0 0 0 0 0 0 0 0

See also

element_aligned_tagelement_aligned (parallelism TS v2)	flag indicating alignment of the load/store address to element alignment (class)
vector_aligned_tagvector_aligned (parallelism TS v2)	flag indicating alignment of the load/store address to vector alignment (class)
overaligned_tagoveraligned (parallelism TS v2)	flag indicating alignment of the load/store address to the specified alignment (class template)
memory_alignment (parallelism TS v2)	obtains an appropriate alignment for vector_aligned (class template)
copy_from (parallelism TS v2)	loads simd_mask elements from contiguous memory (public member function)

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