std::experimental::simd_mask<T,Abi>::simd_mask
From cppreference.com
simd_mask() noexcept = default;
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(1) | (parallelism TS v2) |
explicit simd_mask( bool value ) noexcept;
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(2) | (parallelism TS v2) |
template< class U >
simd_mask( const simd_mask<U, simd_abi::fixed_size<size()>>& other ) noexcept;
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(3) | (parallelism TS v2) |
template< class U, class Flags >
simd_mask( const bool* mem, Flags flags );
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(4) | (parallelism TS v2) |
simd_mask( const simd_mask& other ) noexcept = default;
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(5) | (parallelism TS v2) (implicitly declared) |
simd_mask( simd_mask&& other ) noexcept = default;
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(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
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| other | - | another simd_mask to copy from
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| mem | - | a pointer into an array where [mem, mem + size()) is a valid range
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| flags | - | if of type vector_aligned_tag, the load constructor may assume mem to point to storage aligned by memory_alignment_v<simd_mask>
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| Type requirements | ||
-is_simd_flag_type_v<Flags> must be true.
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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
(parallelism TS v2) |
flag indicating alignment of the load/store address to element alignment (class) |
(parallelism TS v2) |
flag indicating alignment of the load/store address to vector alignment (class) |
(parallelism TS v2) |
flag indicating alignment of the load/store address to the specified alignment (class template) |
(parallelism TS v2) |
obtains an appropriate alignment for vector_aligned (class template) |
(parallelism TS v2) |
loads simd_mask elements from contiguous memory (public member function) |