no_aligning

Detailed Description

Stops an algorithm from aligning its accesses.

Variables
constexpr auto	eve::algo::no_aligning = ::rbr::flag( no_aligning_tag{} )

Variable Documentation

no_aligning

auto eve::algo::no_aligning = ::rbr::flag( no_aligning_tag{} )

inlineconstexpr

Header file #include <eve/module/algo.hpp>

namespace eve::algo
{
  inline constexpr auto no_aligning = eve_implementation_defined;
}

Disables the alignment of memory accesses. By default a partial first register is read so that every following register is at an aligned address, and the loads are faster. With the trait the loop is started at the first element and the accesses are not aligned, which is cheaper on a short range, where the partial register is not repaid.

std::vector<float> data(24);
 
// A range this short does not repay the partial first register an aligned loop reads.
auto found = find_if[no_aligning](data, [](auto x) { return x > 0.f; });

See also

divisible_by_cardinal, expensive_callable