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In my experience, the 1.x releases of LuaJIT have typically made whole programs (not just benchmarks) run 2-3+x faster than standard Lua. Without any other changes. :)

I haven't tried LuaJIT 2 yet, but I'm eagerly waiting for it to get ported to amd64.

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The fact that luaJIT is written in assembler makes me wonder how practical an amd64 port. :-\

Most of the VM is written in C. Only the core of the interpreter is written in assembler (generates ~13K of machine code).

And the port of the interpreter to x64 is already done, so it was certainly practical. Porting the rest of the VM and the JIT compiler is what takes most of the time.

Thanks for the clarification!

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