Re: +=
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- Subject: Re: +=
- From: Luiz Henrique de Figueiredo <lhf@...>
- Date: 2001年3月27日 21:25:20 -0300 (EST)
>Anyone considered adding a += (and -=, /=. *=) operator to lua?
Yes, I think this has been discussed before.
>I notice I have a lot of code that does stuff like:
>
>self.x = self.x + dx
>
>I'm guessing that:
>
>self.x += dx
>
>could be compiled to something with fewer table look-ups and instructions(?)
I doubt it, because of the possibility of tag methods coming into action.
Right now, the bytecode for "self.x = self.x + dx" is
GETGLOBAL 0 ; self
PUSHSTRING 1 ; "x"
GETGLOBAL 0 ; self
GETDOTTED 1 ; x
GETGLOBAL 2 ; dx
ADD
SETTABLE 3 3
END
Except for the two GETGLOBAL for self, I don't see how this can be shortened.
--lhf