From: "Richard M. Stallman" <rms@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Byte compiler inefficiency
Date: Mon, 08 Aug 2005 22:43:48 -0400 [thread overview]
Message-ID: <E1E2K5k-0008U9-5f@fencepost.gnu.org> (raw)
In-Reply-To: <854qa04o3q.fsf@lola.goethe.zz> (message from David Kastrup on Mon, 08 Aug 2005 14:20:09 +0200)
> When cadr is called interpretively, the binding of x is like any
> other binding.
Sure, but the binding can't possible have any effect on the result.
In the particular case of cadr, it can't, because no non-primitive
functions are called. If the compiler could detect this kind of case,
it could do the optimization safely.
However, if the defsubst calls some non-primitives, they could refer
to the variable, so failing to bind it would be unsafe.
Implementing the optimization in the former case would be useful,
and I will put it in etc/TODO, but it should not be done until
after the release.
next prev parent reply other threads:[~2005-08-09 2:43 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-07 11:34 Byte compiler inefficiency David Kastrup
2005-08-08 12:09 ` Richard M. Stallman
2005-08-08 12:20 ` David Kastrup
2005-08-09 2:43 ` Richard M. Stallman [this message]
2005-08-09 7:06 ` David Kastrup
2005-08-10 0:16 ` Stefan Monnier
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