LuaJIT performance query

[David Given <dg@...>]

Let's say I'm writing a program that's intended for use on LuaJIT.

Is it still necessary to cache globals in local variables for decent
performance, or can I expect the JIT to optimise this for me?

For example:

i = 0
while (i < 10000) do i = i + 1 end

vs.

local i = 0
while (i < 10000) do i = i + 1 end

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