std::experimental::simd<T,Abi>::size

 

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Standard library

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Feature test macros (哋它亢++20)

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Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

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Ranges library (哋它亢++20)

Algorithms library

Numerics library

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Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++11)

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)

Extensions for parallelism (parallelism TS)

Extensions for parallelism 2 (parallelism TS v2)

Extensions for concurrency (concurrency TS)

Extensions for concurrency 2 (concurrency TS v2)

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Pattern Matching

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std::execution

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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
Task blocks
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

Member functions
simd copy_from copy_to size	operator!operator~operator+operator-	operator[] operator++operator--
Non-member functions
operator+operator-operator*operator/operator%operator&operator|operator^operator<<operator>>	operator+=operator-=operator*=operator/=operator%=operator&=operator|=operator^=operator<<=operator>>=	operator==operator!=operator>=operator<=operator>operator<

 

static constexpr size_t size() noexcept;		(parallelism TS v2)

Returns the width (the number of values) of simd<T, Abi>.

Example

The actual output depends on target and compiler flags.

Run this code

#include <experimental/simd>
#include <cstdint>
#include <iostream>
namespace stdx = std::experimental;
 
int main()
{
    stdx::native_simd<std::int32_t> a = 1;
    std::cout << a.size() << '\n';
    std::cout << reduce(a) << '\n';
}

Possible output:

16
16

See also

simd_size (parallelism TS v2)	obtains the number of elements of a given element type and ABI tag (class template)
size [static] (parallelism TS v2)	returns the width / number of elements (public static member function of std::experimental::simd_mask<T,Abi>)