From: Paul Eggert <paul.eggert@verizon.net>
To: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
Cc: emacs-devel@gnu.org
Subject: Re: [Emacs-diffs] /srv/bzr/emacs/trunk r107377: * src/lisp.h: Improve comment about USE_LSB_TAG.
Date: Wed, 22 Feb 2012 22:28:28 -0800 [thread overview]
Message-ID: <4F45DC8C.9040607@verizon.net> (raw)
In-Reply-To: <wlfwe2qk0f.wl%mituharu@math.s.chiba-u.ac.jp>
On 02/22/2012 07:57 PM, YAMAMOTO Mitsuharu wrote:
> Does "untagging by subtraction instead of masking" improve the
> performance of USE_LSB_TAG in your platform?
I'm sure it would, though I haven't measured it.
I'm surprised that this hasn't been implemented in Emacs already.
It's a standard technique (I first saw it in the 1980s), and it's clearly
faster that what Emacs is doing now. We should look into incorporating it
after 24.1 comes out.
next prev parent reply other threads:[~2012-02-23 6:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1S0EsZ-0006bE-5w@vcs.savannah.gnu.org>
2012-02-22 20:25 ` [Emacs-diffs] /srv/bzr/emacs/trunk r107377: * src/lisp.h: Improve comment about USE_LSB_TAG Stefan Monnier
2012-02-23 1:20 ` Paul Eggert
2012-02-23 3:15 ` Stefan Monnier
2012-02-23 6:31 ` Paul Eggert
2012-02-23 7:42 ` Stefan Monnier
2012-02-25 7:00 ` Paul Eggert
2012-02-25 10:06 ` Stefan Monnier
2012-02-25 19:46 ` Paul Eggert
2012-02-23 3:57 ` YAMAMOTO Mitsuharu
2012-02-23 6:28 ` Paul Eggert [this message]
2012-05-09 17:56 ` Paul Eggert
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