From: <tomas@tuxteam.de>
To: help-gnu-emacs@gnu.org
Subject: Re: Bit shift oddity?
Date: Mon, 19 Oct 2020 11:01:59 +0200 [thread overview]
Message-ID: <20201019090159.GA11667@tuxteam.de> (raw)
In-Reply-To: <3b4def4b-28c5-d549-0645-0056f0709549@gmail.com>
[-- Attachment #1: Type: text/plain, Size: 700 bytes --]
On Mon, Oct 19, 2020 at 03:48:01AM -0400, Douglas Lewan wrote:
> Thanks. I see the same behavior with (ash).
Well, it's not exactly the "same behaviour", the inequalities
seem to be the same, but the intermediate numbers are not.
FWIW:
(dotimes (i 10)
(let ((shift (- -1 i)))
(insert (format "shift=%d res=%d\n"
shift
(ash shift (lognot 0))))))
=>
shift=-1 res=-1
shift=-2 res=-1
shift=-3 res=-2
shift=-4 res=-2
shift=-5 res=-3
shift=-6 res=-3
shift=-7 res=-4
shift=-8 res=-4
shift=-9 res=-5
shift=-10 res=-5
I don't quite understand the result; I may look into it later.
Cheers
- t
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 198 bytes --]
next prev parent reply other threads:[~2020-10-19 9:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-19 0:19 Bit shift oddity? Douglas Lewan
2020-10-19 7:06 ` tomas
2020-10-19 7:48 ` Douglas Lewan
2020-10-19 9:01 ` tomas [this message]
2020-10-19 15:14 ` Stefan Monnier
2020-10-19 15:30 ` tomas
2020-10-19 9:23 ` Gregory Heytings via Users list for the GNU Emacs text editor
2020-10-19 15:19 ` Douglas Lewan
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201019090159.GA11667@tuxteam.de \
--to=tomas@tuxteam.de \
--cc=help-gnu-emacs@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.