From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "Juanma Barranquero" <lekktu@gmail.com>
Cc: emacs-devel@gnu.org
Subject: Re: "simplifications"
Date: Mon, 19 Nov 2007 10:11:41 -0500 [thread overview]
Message-ID: <jwv63zyz37s.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <f7ccd24b0711190256p7b6c62e4m4d86edaeb38b749e@mail.gmail.com> (Juanma Barranquero's message of "Mon, 19 Nov 2007 11:56:35 +0100")
> is not my idea of fun, or legible, or maintainable, or... you pick the
> word. Not that c??r is much of an improvement; we should be able to
> define accesor functions in the package
> (defsubst ring--vec (ring)
> (cdr (cdr ring)))
> and have the byte-compiler optimize them away.
1 - if you use defsubst* the byte-code will look good.
2 - you can use defstruct to get all that and more.
3 - I don't think it's worth the trouble to make the byte-optimizer more
complex for such little benefit. If you want to improve it, use the
lexbind branch: it's a much saner starting point.
Stefan "whose local Emacs hacks include some byte-optimizer
improvement which does manage to optimize `cadr' but it's too
much work works with too many limitations and on top of
that, it's not even clear that the optimization is
always correct: it doesn't account for the case where
you do
(defsubst cadr (debug-on-error) (car (cdr debug-on-error)))
in which case the optimization is not semantics preserving"
next prev parent reply other threads:[~2007-11-19 15:11 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-19 10:46 "simplifications" David Kastrup
2007-11-19 10:56 ` "simplifications" Juanma Barranquero
2007-11-19 15:11 ` Stefan Monnier [this message]
2007-11-19 15:19 ` "simplifications" David Kastrup
2007-11-19 15:39 ` "simplifications" Juanma Barranquero
2007-11-19 15:44 ` "simplifications" Stefan Monnier
2007-11-19 15:47 ` "simplifications" Juanma Barranquero
2007-11-19 15:58 ` "simplifications" Stefan Monnier
2007-11-19 16:08 ` "simplifications" Juanma Barranquero
2007-11-19 18:46 ` "simplifications" Stefan Monnier
2007-11-19 16:02 ` "simplifications" David Kastrup
2007-11-19 16:05 ` "simplifications" Juanma Barranquero
2007-11-20 3:59 ` "simplifications" Richard Stallman
2007-11-20 15:27 ` "simplifications" Stefan Monnier
2007-11-21 21:37 ` "simplifications" Stephen J. Turnbull
2007-11-21 21:52 ` "simplifications" David Kastrup
2007-11-22 1:34 ` "simplifications" Stephen J. Turnbull
2007-11-19 11:02 ` "simplifications" Juanma Barranquero
2007-11-19 11:33 ` "simplifications" Miles Bader
2007-11-19 11:57 ` "simplifications" David Kastrup
2007-11-19 12:08 ` "simplifications" Juanma Barranquero
2007-11-19 12:21 ` "simplifications" David Kastrup
2007-11-19 12:32 ` "simplifications" Juanma Barranquero
2007-11-19 12:49 ` "simplifications" David Kastrup
2007-11-19 12:54 ` "simplifications" Juanma Barranquero
2007-11-20 3:59 ` "simplifications" Richard Stallman
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