It clearly depends on the workload. If you have tons of 3d articles or polygons on a screen, one of the most repeated operations are the calculation of norms (x

It clearly depends on the workload. If you have tons of 3d articles or polygons on a screen, one of the most repeated operations are the calculation of norms (x/sqrt(sum(x)). John carmack came to the fast inverse sqrt root explicitly for this speed advantage