Oh that range reduction. :) I’m aware of the technique, but thanks I did misunderstand what you were referring to. I don’t know what Nvidia hardware does exactly. For __sinf(), the CUDA guide says: “For x in [-pi,pi], the maximum absolute error is 2^(-21.41), and larger otherwise.” That totally doesn’t answer your question, it could still go either way, but it does kinda tend to imply that it’s best to keep the inputs in-range.