RFR (S) 8136500: Integer/Long getChars and stringSize should be more idiomatic

[John Rose]

On Nov 23, 2015, at 1:42 PM, Aleksey Shipilev <aleksey.shipilev at oracle.com> wrote:
> 
> Okay, here it is (only tests changed):
> http://cr.openjdk.java.net/~shade/8136500/webrev.06/ <http://cr.openjdk.java.net/~shade/8136500/webrev.06/>

Thanks; that's a solid test.

Cleanups are good too.

You can count me as a reviewer.

— John

P.S.  I think a promising stringSize for *random* inputs would
switch on numberOfLeadingZeros and then perform at most
one comparison per case.  We'd have to improve our game
optimizing switches, though, not to hurt performance on
the naturally occurring distributions.

Again, Integer.toString for *random* inputs is an interesting
problem that is probably amenable to divide-and-conquer,
or at least to encoding more than one digit at a time.

P.P.S. I filed https://bugs.openjdk.java.net/browse/JDK-8143859 <https://bugs.openjdk.java.net/browse/JDK-8143859>
to track an underlying problem with the JIT, which is that
it should be balancing those test trees for you.