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Ezequiel García wrote:
> 1. Does anyone know if it is at least theoretically possible to port Lua JIT to SH4? 


> 2. What are the architecture requirements for such a port?

32 bit user mode, hardware FPU (soft-float is very complicated).

> 3. In case of being possible, is anyone else interested or willing to provide me some help? 

Look at the git log for e.g. the ARM port and follow the same
steps: 1. DynASM, 2. Interpreter, 3. JIT compiler. You'll need to
familiarize yourself with the code base first, of course.