From: Richard Stallman <rms@gnu.org>
Cc: Lute.Kamstra.lists@xs4all.nl, emacs-devel@gnu.org
Subject: Re: Adding rassq-delete-all to lisp/subr.el.
Date: Thu, 21 Apr 2005 11:30:38 -0400 [thread overview]
Message-ID: <E1DOddW-0005mT-MN@fencepost.gnu.org> (raw)
In-Reply-To: <854qe267rp.fsf@lola.goethe.zz> (message from David Kastrup on Tue, 19 Apr 2005 18:39:06 +0200)
> Strange, (cadr ...) is just a defsubst for (car (cdr ...)). So
> compiled it should make no difference.
The defsubst binds and unbinds x. I consider that a byte compiler
deficiency.
In general, the byte compiler cannot omit that binding.
It does not know that the binding won't be referred to
from one of the functions that is called.
However, in this specific case, cadr calls only primitives, so that
can't happen. It would not be too hard to change the compiler to
recognize that and eliminate the binding. That could be a useful
thing to work on, but shouldn't be installed now.
next prev parent reply other threads:[~2005-04-21 15:30 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-19 13:28 Adding rassq-delete-all to lisp/subr.el Lute Kamstra
2005-04-19 14:06 ` Lute Kamstra
2005-04-19 15:12 ` David Kastrup
2005-04-19 16:23 ` Lute Kamstra
2005-04-19 16:39 ` David Kastrup
2005-04-21 15:30 ` Richard Stallman [this message]
2005-04-21 17:33 ` Lute Kamstra
2005-04-19 22:27 ` Richard Stallman
2005-04-20 9:41 ` Lute Kamstra
2005-04-20 21:42 ` Richard Stallman
2005-04-20 23:23 ` Lute Kamstra
2005-04-21 15:30 ` Richard Stallman
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