Luna::Simd::dot2v_f4

float4 dot2v_f4(float4 a, float4 b)

Computes the dot product on the first two elements of a and b, and stores the result in each element of dst.

dp := (a.x * b.x) + (a.y * b.y)
dst.x := dp
dst.y := dp
dst.z := dp
dst.w := dp