ARM's Jazelle is not a VM in hardware. It is a mode of the processor which can execute Java bytecodes in hardware, but it still needs a full-fledged Java VM to be made use of. What's more, the VM has to be written specifically to work with Jazelle, because it requires a specific memory model (what classes and objects look like in memory), which doesn't allow many standard optimizations of a standard VM.
In many cases, JIT or AOT turns out to be much faster than Jazelle-like processors.
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Jazelle is not a VM in hardware.
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Refer to my previous post:
http://slashdot.org/comments.pl?sid=29543&
ARM's Jazelle is not a VM in hardware. It is a mode of the processor which can execute Java bytecodes in hardware, but it still needs a full-fledged Java VM to be made use of. What's more, the VM has to be written specifically to work with Jazelle, because it requires a specific memory model (what classes and objects look like in memory), which doesn't allow many standard optimizations of a standard VM.
In many cases, JIT or AOT turns out to be much faster than Jazelle-like processors.