Not a real answer because I've never deployed such a thing, but I could imagine using these functions to bootstrap an approximation procedure (e.g. newton-raphs

Not a real answer because I've never deployed such a thing, but I could imagine using these functions to bootstrap an approximation procedure (e.g. newton-raphson, or something of the sort) so you're going to do an accuracy refinement anyways that is going to buy you more accuracy and guarantee convergence within <1 ulp in a subsequent step so you might as well use a fast instruction over an accurate one for the first step.