From: Paul Eggert <eggert@cs.ucla.edu>
To: emacs-devel@gnu.org
Subject: Re: [Emacs-diffs] master 605f901: Prefer memcpy and memset to doing it by hand
Date: Sun, 7 Feb 2016 13:24:28 -0800 [thread overview]
Message-ID: <56B7B60C.7070407@cs.ucla.edu> (raw)
In-Reply-To: <m237t4quee.fsf@newartisans.com>
John Wiegley wrote:
> Is this so performance critical that we can't just always use the memset?
We can't always use the memset. The memset works only if the bit pattern we're
trying to store can be implemented by storing the same unsigned char value
repeatedly. The important special case here is storing Qnil, which is
represented by the all-zeros bit pattern.
prev parent reply other threads:[~2016-02-07 21:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20160205003917.14369.86929@vcs.savannah.gnu.org>
[not found] ` <E1aRUQf-0003kP-6V@vcs.savannah.gnu.org>
2016-02-05 13:25 ` [Emacs-diffs] master 605f901: Prefer memcpy and memset to doing it by hand Stefan Monnier
2016-02-05 22:40 ` Paul Eggert
2016-02-07 17:53 ` John Wiegley
2016-02-07 21:24 ` Paul Eggert [this message]
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