std::experimental::simd_abi::max_fixed_size
From cppreference.com
< cpp | experimental | simd
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Experimental
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)
Concepts (concepts TS)
Ranges (ranges TS)
Reflection (reflection TS)
Mathematical special functions (special functions TR)
Extensions for parallelism v2
Parallel exceptions
Additional execution policies
Algorithms
Task blocks
SIMD library
simd_abi::max_fixed_size
Defined in header
<experimental/simd>
template< class T >
constexpr int max_fixed_size = /*implementation-defined*/;
(parallelism TS v2)
constexpr int max_fixed_size = /*implementation-defined*/;
The value of max_fixed_size<T> declares that an instance of simd<T, fixed_size<N>> with N <= max_fixed_size<T> is supported by the implementation. The value of max_fixed_size<T> is at least 32.
[edit] Notes
It is unspecified whether an implementation supports simd<T, fixed_size<N>> with N > max_fixed_size<T>. The value of max_fixed_size<T> may depend on compiler flags and may change between different compiler versions.
[edit] Example
Run this code
#include <cstdint> #include <experimental/simd> #include <iostream> namespace stq = std::experimental; int main() { std::cout << stq::simd_abi::max_fixed_size<std::uint8_t > << ' '; std::cout << stq::simd_abi::max_fixed_size<std::uint64_t > << ' '; std::cout << stq::simd_abi::max_fixed_size<float> << ' '; std::cout << stq::simd_abi::max_fixed_size<long double> << '\n'; }
Possible output:
32 32 32 32