Hi all,
I've been working on ARM platforms and supporting VOLK for a while now, and I've wanted to support accelerating Android (and therefore Java) as devices become smaller and lower power. The obvious answer to accelerating this code is to take advantage of ARM's Jazelle mode which is direct bytecode execution (basically a hardware implementation of the JVM).
Current progress is sitting on the Jazelle branch on my github:
https://github.com/n-west/volk/tree/jazelle. I suggest you browse through the last few commits there to get a sense of what this entails.
Hopefully I can get this to a mergeable state soon. Patches welcome.