Does this mean that Java Math.floor is extremely slow?

Question

I don\'t Java much.

I am writing some optimized math code and I was shocked by my profiler results. My code collects values, interleaves the data and then chooses th

Answer 1

You might want to give a try to FastMath.

Here is a post about the performance of Math in Java vs. Javascript. There are a few good hints about why the default math lib is slow. They are discussing other operations than floor, but I guess their findings can be generalized. I found it interesting.

EDIT

According to this bug entry, floor has been implemented a pure java code in 7(b79), 6u21(b01) resulting in better performance. The code of floor in the JDK 6 is still a bit longer than the one in FastMath, but might not be responsible for such a perf. degradation. What JDK are you using? Could you try with a more recent version?