What is the loop inversion technique?

I was going through a document which talks about just-in-time compiler (JIT) optimization techniques for Java. One of them was "loop inversion". And the document says:

You replace a regular while loop with a do-while loop. And the do-while loop is set within an if clause. This replacement leads to two fewer jumps.

How does loop inversion work and how does it optimize our code path?

N.B.: It would be great if somebody can explain with an example of Java code and how JIT optimizes it to native code and why is it optimal in modern processors.