Very interesting article, thanks for sharing. I'm still considering using SLJIT for my Micron interpreter (https://github.com/rochus-keller/Micron), which is a stack machine as well; but given the relatively low speed-up I still doubt whether it's worthwhile. It should then also support some kind of debugger (not only for JIT development, but for the user of the jitted language), which is apparently not yet supported by SLJIT.