Re: Optimizing off-line Lua compiler

[Rici Lake <lua@...>]

On 27-Apr-05, at 10:05 AM, Luiz Henrique de Figueiredo wrote:

> > Peephole-optimisation might be a goer -- I assume there would be some
> > level of redundancy in the generated byte-code.  But this is really
> > something that could be applied to the lua.lib portion anyway I'd 
> > assume
> > -- but considering it was stripped from lua5 because it was becoming 
> > to 
> > difficult to maintain?
>
> Actually, all optimizations done by luac in 4.0 are done by the parser 
> in 5.0.
> --lhf

The one little optimization which might make a fun project for someone 
is the common idiom:

  a and b or c

where b is a constant.

Currently, the compiler generates a redundant check on b (redundant if 
b is constant, anyway).

Of course an actual ternary operator could be optimised even better, 
since the intent was probably a ? b : c in the first place. But I'm not 
advocating that.