Parameter passing in a register based VM

[Marco Bambini <marco@...>]

In a stack based VM (and I think in the pre 5.x lua version) an efficient way to pass parameters between function calls is via frame overlapping.
Since Lua 5 is register based I think that this method cannot be used, so how Lua pass parameters? And how a return value can be stored in the right caller register?

Thanks a lot.
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Marco Bambini
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