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JVM on G5

I was wondering if the JVM on Mac OS X 'adjusts' itself to make use of
specific processor capabilities, for instance the processing power of the
64-bit PowerPC G5. More specifically, does the JVM 'behave' differently on
such a processor with respect to floating point calculations, use of the
Java long (64-bit) datatype, dual processor, etc. Or is it the exact same
JVM as on a 32-bit architecture?

If so, are there any JVM startup options or other steps one can take to
improve the speed of floating-point operations on such hardware?

I understand my questions are quite general (I'm no expert) but the Apple
websites on the new G5 and Java on Mac OS X aren't very helpful with respect
to these practical issues. I realize the OS will have something to do with
it also. Maybe one of you can provide some useful information or point me
to some publications on this topic. Thanks.

- Kris
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