[AntonErtl]

However, if you leave register allocation to the source->VM compiler and don't do it in the VM->machine compiler (JIT), you cannot perform machine-specific register allocation (8 registers on IA-32, 16 on AMD64 and ARM, 32 on Aarch64). So register-based VMs typically work with large register sets, and JITs allocate them to the smaller register sets of real machines.

I have not read the present paper yet, but earlier papers I have read were about reducing interpretation overhead by performing fewer VM instructions (if VM instruction dispatch is expensive; dynamic superinstructions make it cheap, but not everyone implements them).

[frjalex]

Note that the JIT mechanism mentioned in the paper meant basically JIT from a program code to the bytecode executed in the VM, and directly executing it (very much like PHP), not necessarily directly to machine assembly.

[frjalex]

Interesting.... the paper referenced you if you're the correct Anton Ertl :)