amrex::simd::stdx Namespace Reference

Functions
__host__ __device__ bool	any_of (bool const v)
template<typename T >
__host__ __device__ detail::where_expression< T >	where (bool const mask, T &value)
template<typename T >
__host__ __device__ T	select (bool const mask, T const &true_val, T const &false_val)
template<typename T >
__host__ __device__ T	reduce (T const &v)
template<typename T , typename BinaryOperation >
__host__ __device__ T	reduce (T const &v, BinaryOperation const &)
template<typename T >
__host__ __device__ T	hmin (T const &v)
template<typename T >
__host__ __device__ T	hmax (T const &v)
template<typename T >
__host__ __device__ T	min (T const &a, T const &b)
template<typename T >
__host__ __device__ T	max (T const &a, T const &b)

Function Documentation

any_of()

__host__ __device__ bool amrex::simd::stdx::any_of ( bool const  v )

inline

True if the boolean value is true (scalar identity fallback for simd any_of)

Example:

// Works for both simd_mask and scalar bool:
auto mask = a > b;
if (amrex::simd::stdx::any_of(mask)) { ... }

See also

https://en.cppreference.com/w/cpp/experimental/simd/any_of

hmax()

template<typename T >

__host__ __device__ T amrex::simd::stdx::hmax ( T const &  v )

inline

Largest element (scalar identity fallback for simd hmax)

See also

https://en.cppreference.com/w/cpp/experimental/simd/reduce_min_max

hmin()

template<typename T >

__host__ __device__ T amrex::simd::stdx::hmin ( T const &  v )

inline

Smallest element (scalar identity fallback for simd hmin)

See also

https://en.cppreference.com/w/cpp/experimental/simd/reduce_min_max

max()

template<typename T >

__host__ __device__ T amrex::simd::stdx::max ( T const &  a, T const &  b  )

inline

Element-wise maximum (scalar fallback for simd max)

See also

https://en.cppreference.com/w/cpp/experimental/simd/max

min()

template<typename T >

__host__ __device__ T amrex::simd::stdx::min ( T const &  a, T const &  b  )

inline

Element-wise minimum (scalar fallback for simd min)

See also

https://en.cppreference.com/w/cpp/experimental/simd/min

reduce() [1/2]

template<typename T >

__host__ __device__ T amrex::simd::stdx::reduce ( T const &  v )

inline

Horizontal reduction over all elements (scalar identity fallback for simd reduce)

For a scalar, the reduction over its single "element" is the value itself, independent of the (associative) binary operation.

Example:

// Works for both simd<T> and scalar T:
auto total = amrex::simd::stdx::reduce(v);  // sum of all elements

See also

https://en.cppreference.com/w/cpp/experimental/simd/reduce

reduce() [2/2]

template<typename T , typename BinaryOperation >

__host__ __device__ T amrex::simd::stdx::reduce ( T const &  v, BinaryOperation const &    )

inline

Horizontal reduction with an explicit binary operation (scalar identity fallback)

See also

reduce above

select()

template<typename T >

__host__ __device__ T amrex::simd::stdx::select ( bool const  mask, T const &  true_val, T const &  false_val  )

inline

Vectorized ternary operator (scalar fallback for simd select)

See also

select in the AMREX_USE_SIMD path above

C++26 std::simd select

where()

template<typename T >

__host__ __device__ detail::where_expression< T > amrex::simd::stdx::where ( bool const  mask, T &  value  )

inline

Masked assignment expression (scalar fallback for simd where)

Returns an expression object whose assignment operator conditionally updates value only when mask is true.

Example:

// Works for both simd<T> and scalar T:
auto mask = b > T(0);
T result = T(0);
amrex::simd::stdx::where(mask, result) = a / b;

See also

https://en.cppreference.com/w/cpp/experimental/simd/where