From: Richard Stallman <rms@gnu.org>
To: Dan Nicolaescu <dann@ics.uci.edu>
Cc: emacs-devel@gnu.org
Subject: Re: byte compiling defcustom
Date: Thu, 15 Nov 2007 23:28:17 -0500 [thread overview]
Message-ID: <E1IssoT-0003OT-GZ@fencepost.gnu.org> (raw)
In-Reply-To: <ur9oddw1535.fsf@mothra.ics.uci.edu> (message from Dan Nicolaescu on Wed, 14 Nov 2007 20:54:22 -0800)
(defvar foo (if (featurep 'xemacs) 'bar 'baz) "doc")
(defcustom foo1 (if (featurep 'xemacs) 'bar 'baz) "doc")
Are compiled to:
(defvar foo 'baz (#$ . 543))
(custom-declare-variable 'foo1 '(if (featurep 'xemacs) 'bar 'baz) '(#$ . 581))
The initial value expression for defcustom is saved and gets
recalculated later in some cases. So it cannot in general be
optimized.
This particular simplification could be done even in defcustom, since
(featurep 'xemacs) is effectively a constant. But why bother
to implement that optimization? It works fine as it is now.
next prev parent reply other threads:[~2007-11-16 4:28 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-15 4:54 byte compiling defcustom Dan Nicolaescu
2007-11-16 4:28 ` Richard Stallman [this message]
2007-11-16 15:25 ` Stefan Monnier
2007-11-17 4:53 ` Richard Stallman
2007-11-18 4:07 ` Stefan Monnier
2007-11-17 4:53 ` Richard Stallman
2007-11-17 5:40 ` Dan Nicolaescu
2007-11-17 16:47 ` Luc Teirlinck
2007-11-17 19:06 ` Dan Nicolaescu
2007-11-17 19:51 ` Luc Teirlinck
2007-11-17 20:05 ` Luc Teirlinck
2007-11-18 13:00 ` Richard Stallman
2007-11-18 18:24 ` disappearing custom menu (was: Re: byte compiling defcustom) Dan Nicolaescu
2007-11-18 18:42 ` Drew Adams
2007-11-18 18:47 ` disappearing custom menu Lennart Borgman (gmail)
2007-11-18 19:20 ` martin rudalics
2007-11-18 19:33 ` Dan Nicolaescu
2007-11-18 19:44 ` martin rudalics
2007-11-18 23:41 ` Dan Nicolaescu
2007-11-19 7:58 ` martin rudalics
2007-11-19 12:25 ` Richard Stallman
2007-11-19 13:08 ` martin rudalics
2007-11-19 15:28 ` Drew Adams
2007-11-18 19:57 ` Drew Adams
2007-11-18 22:23 ` martin rudalics
2007-11-17 19:55 ` byte compiling defcustom Luc Teirlinck
2007-11-17 20:32 ` Luc Teirlinck
2007-11-17 20:41 ` Luc Teirlinck
2007-11-18 4:13 ` Luc Teirlinck
2007-11-18 4:32 ` Stefan Monnier
2007-11-18 5:11 ` Luc Teirlinck
2007-11-18 18:04 ` Dan Nicolaescu
2007-11-18 18:41 ` Luc Teirlinck
2007-11-18 23:29 ` Dan Nicolaescu
2007-11-19 7:55 ` Stefan Monnier
2007-11-19 19:03 ` Richard Stallman
2007-11-19 20:44 ` Luc Teirlinck
2007-11-20 12:12 ` Richard Stallman
2007-11-19 20:48 ` Luc Teirlinck
2007-11-19 19:03 ` Richard Stallman
2007-11-19 12:25 ` Richard Stallman
2007-11-19 15:48 ` Dan Nicolaescu
2007-11-20 3:59 ` Richard Stallman
2007-11-17 23:31 ` Richard Stallman
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