There's Jazelle for ARM, it's essentially a instruction overlay that makes the cpu execute all simple and common java bytecodes directly, and call a kernel func

There's Jazelle for ARM, it's essentially a instruction overlay that makes the cpu execute all simple and common java bytecodes directly, and call a kernel function for all the hard ones. However, even that is dying -- it is being replaced by the thumbEE, which is a more generic instruction set designed for efficient code generation from intermediate dynamic code.