From: Eli Zaretskii <eliz@gnu.org>
To: Dmitry Antipov <dmantipov@yandex.ru>
Cc: dak@gnu.org, monnier@iro.umontreal.ca, emacs-devel@gnu.org
Subject: Re: Enlarge MAX_ALLOCA?
Date: Fri, 20 Jun 2014 11:56:30 +0300 [thread overview]
Message-ID: <83a998rmbl.fsf@gnu.org> (raw)
In-Reply-To: <53A3F2EB.80005@yandex.ru>
> Date: Fri, 20 Jun 2014 12:38:03 +0400
> From: Dmitry Antipov <dmantipov@yandex.ru>
> Cc: David Kastrup <dak@gnu.org>, emacs-devel@gnu.org
>
> On 06/19/2014 10:21 PM, Stefan Monnier wrote:
>
> >> 64kB feels arbitrary. I cannot really think of an architecture where
> >> 64kB would be feasible and 128kB not. ±32kB is a plausible offset for
> >> some architectures.
> >
> > This has nothing to do with machine architectures.
> > It's only related to the OS chosen size of the stack.
>
> IIUC this means that if alloca is limited to < 32K, stack may be expanded
> with just one instruction because increment fits into an immediate operand.
> Otherwise there should be a few more load/store/add instructions.
OK, but is that worse than using xmalloc in that case?
next prev parent reply other threads:[~2014-06-20 8:56 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-19 16:02 Enlarge MAX_ALLOCA? Eli Zaretskii
2014-06-19 16:23 ` David Kastrup
2014-06-19 16:48 ` Eli Zaretskii
2014-06-19 17:04 ` David Kastrup
2014-06-19 17:14 ` Eli Zaretskii
2014-06-19 17:36 ` David Kastrup
2014-06-19 17:51 ` Eli Zaretskii
2014-06-19 18:21 ` Stefan Monnier
2014-06-19 21:13 ` David Kastrup
2014-06-20 7:10 ` Eli Zaretskii
2014-06-20 8:08 ` David Kastrup
2014-06-20 8:38 ` Dmitry Antipov
2014-06-20 8:56 ` Eli Zaretskii [this message]
2014-06-20 9:26 ` Andreas Schwab
2014-06-20 9:38 ` David Kastrup
2014-06-19 18:28 ` Stefan Monnier
2014-06-19 18:38 ` Eli Zaretskii
2014-06-19 20:37 ` Stefan Monnier
2014-06-20 7:08 ` Eli Zaretskii
2014-06-20 13:02 ` Stefan Monnier
2014-06-20 13:18 ` Eli Zaretskii
2014-06-20 14:43 ` Stefan Monnier
2014-06-20 14:50 ` Eli Zaretskii
2014-06-20 15:15 ` Herring, Davis
2014-06-20 15:44 ` Dmitry Antipov
2014-06-20 18:36 ` Eli Zaretskii
2014-06-21 13:01 ` K. Handa
2014-06-21 13:59 ` Eli Zaretskii
2014-06-21 17:08 ` Stefan Monnier
2014-06-22 9:22 ` K. Handa
2014-06-28 14:15 ` K. Handa
2014-06-28 14:38 ` Eli Zaretskii
2014-06-21 15:19 ` David Kastrup
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