Re: Lua

[Andy Wingo <wingo@pobox.com>]

On Thu 03 Jun 2010 22:36, No Itisnt <theseaisinhere@gmail.com> writes:

>> Not a known bug, no. Can you make a test case?
>
> Yes, attached. It appears to happen when (rnrs control) is used. This
> is with the latest master commit.

Thanks!

> It's not urgent, but Lua does mandate tail call optimization.

I think the basic thing would be the equivalent of:

  (lambda args ... (return (foo bar ...)) ...)

  =>
  (lambda args
    (let ((unique-tag (make-prompt-tag)))
      (% unique-tag 
         (...
          (abort-to-prompt unique-tag (lambda () (foo bar ...)))
          ...)
         (lambda (unused-cont thunk) (thunk)))))
      
And from there the compiler would be resposible for removing the prompt,
if possible.

But, I could be totally misled here and there's some much more simple
solution.

> On a related note, what would be the best way to benchmark a compiler
> optimization? I see "benchmark-guile"; is there a way to easily run it
> with an optimization enabled and disabled?  And maybe get some fancy
> charts and graphs, too?

Just running benchmark-guile before and after, I'm afraid... Once
they're in master, there's http://ossau.homelinux.net/~neil/.

Cheers,

Andy
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