Re: LuaJIT performance query

["Alex Davies" <alex.mania@...>]

Hey,

LuaJit has no way of knowing that you didn't run this code before the chunk 
you gave:
setmetatable(_G, { __newindex = function(tab, key, val)
 print "setting global "..key
 rawset(tab, key, val)
end })

Or similar. It is possible for later Jiters to optimize the value to a local 
register and check that the global table still has no metamethods before 
each access, but jit 1.x definitely does not do this. And it would only 
encourage bad programming practices if it did imo. Use locals :)

- Alex