Dude, this outperformed log2 by a large margin, which is what I cared about. Cycles mattered in this code, but after this optimization, that's not where most cy

Dude, this outperformed log2 by a large margin, which is what I cared about. Cycles mattered in this code, but after this optimization, that's not where most cycles were being spent. edit: Investigating further, this intrinsic was introduced into gcc around 2006, which means I'm not sure it would have been available to me at the time.