Function XMVectorSum

pub fn XMVectorSum(V: FXMVECTOR) -> XMVECTOR

Computes the horizontal sum of the components of an XMVECTOR. The horizontal sum is the result of adding each component in the vector together.

https://docs.microsoft.com/en-us/windows/win32/api/directxmath/nf-directxmath-XMVectorSum