On Fri, 17 Feb 2023 04:42:50 GMT, Xiaowei Lu <d...@openjdk.org> wrote:
> After making sure that `intVal` is even, and before attempting a division by > a power of 10, it might help to check if 5 divides `intVal` in the first > place. If it doesn't, there no point in performing the division. > > It can be shown that 5 divides `intVal` if and only if it divides the `long` > sum of all `int`s in the `mag` array of `intVal`. > > I didn't try out if this contributes to improve the overall performance, but > it might be worth giving a try. Unfortunately, it seems this division by 5 doesn't give an obvious performance improvement. Maybe previous lowest bit check has filtered some cases. ------------- PR: https://git.openjdk.org/jdk/pull/12509
