fuse_operations

Detailed Description

Lets an algorithm run its operations as one.

Variables
constexpr auto	eve::algo::fuse_operations = ::rbr::flag( fuse_operations_tag{} )

Variable Documentation

fuse_operations

auto eve::algo::fuse_operations = ::rbr::flag( fuse_operations_tag{} )

inlineconstexpr

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

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

Fuses the transformation and the accumulation of eve::algo::transform_reduce into a single call: the callable is given the running sum as a second argument and returns the new sum, a multiply and an add being a single eve::fma for example. By default the two are separate operations, the transformation then the addition. The addition and its zero are still used, to initialise the partial sums and to reduce them at the end.

std::vector<float> a(1024), b(1024);
 
// The callable takes the running sum too: one eve::fma replaces the multiply and the add.
auto dot = transform_reduce[fuse_operations](views::zip(a, b), [](auto p, auto sum) {
  auto [x, y] = p;
  return eve::fma(x, y, sum);
}, 0.f);

See also

expensive_callable