From: Paul Eggert <eggert@cs.ucla.edu>
To: Stefan Monnier <monnier@iro.umontreal.ca>,
Dmitry Antipov <dmantipov@yandex.ru>
Cc: Eli Zaretskii <eliz@gnu.org>,
Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: [Emacs-diffs] trunk r117941: Default to stack objects on non-GNU/Linux, non-DOS_NT platforms.
Date: Thu, 25 Sep 2014 12:08:05 -0700 [thread overview]
Message-ID: <54246815.7030301@cs.ucla.edu> (raw)
In-Reply-To: <jwviokb1smu.fsf-monnier+emacs@gnu.org>
On 09/25/2014 11:12 AM, Stefan Monnier wrote:
> I saw this extra checking in
> local_cons, I figured this is going to kill too much of the
> performance gain.
I agree that the performance gains are iffy, and would like to see some
measurements here.
If it's any consolation, in some cases the new MAX_ALLOCA checking is
optimized away. For example, other_buffer_safely calls
build_local_string twice, both with constant literals, and in both cases
my compiler (GCC 4.9.1 x86-64) deduces that there's no need to check for
MAX_ALLOCA, and generates code that creates the Lisp string on the stack
unconditionally.
next prev parent reply other threads:[~2014-09-25 19:08 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-25 8:15 [Emacs-diffs] trunk r117941: Default to stack objects on non-GNU/Linux, non-DOS_NT platforms Eli Zaretskii
2014-09-25 9:51 ` Dmitry Antipov
2014-09-25 10:14 ` Eli Zaretskii
2014-09-25 12:52 ` Stefan Monnier
2014-09-25 16:12 ` Dmitry Antipov
2014-09-25 18:12 ` Stefan Monnier
2014-09-25 19:08 ` Paul Eggert [this message]
2014-09-25 9:52 ` Eli Zaretskii
2014-09-25 16:06 ` Paul Eggert
2014-09-25 16:48 ` Eli Zaretskii
2014-09-25 18:46 ` Paul Eggert
2014-09-25 19:16 ` Eli Zaretskii
2014-09-25 20:56 ` Stefan Monnier
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