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Apologies if this isn't strictly a Lua topic. In a recent discussion about Dalvik (Google's mobile phone VM [?]), and at various other times in the past couple of months, I've heard experts on this list saying that register-based VMs are generally considered to give better performance these days than stack-based ones.

I can see why "registers better than stack" for most modern CPUs and chipsets...

...but would someone like to explain why this holds for bytecode VMs?

PS: Was reminded I wanted to ask this question by perusing LuaNews. I like it (and please, don't make it a blog -- the world has enough blogs already :-)