From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org.openvz.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
"H. Peter Anvin" <hpa@zytor.com>,
Pavel Emelyanov <xemul@parallels.com>
Subject: Re: [PATCH] kcmp: Fix standard comparison bug
Date: Thu, 04 Sep 2014 17:35:43 +0200 [thread overview]
Message-ID: <87sik7tn3k.fsf@rasmusvillemoes.dk> (raw)
In-Reply-To: <20140904132912.GL16395@moon> (Cyrill Gorcunov's message of "Thu, 4 Sep 2014 17:29:12 +0400")
On Thu, Sep 04 2014, Cyrill Gorcunov <gorcunov@gmail.com> wrote:
> On Thu, Sep 04, 2014 at 12:40:06PM +0200, Rasmus Villemoes wrote:
>>
>> Note that it makes absolutely no difference that a transmogrying
^^^^
transmogrifying
> It's more than that, I looked into disassembly code and
> found that compiler overoptimize obfuscation, instead of doing
> ^ and * sequently it substracts xor production of both operands
> first and only then multiplies the result.
...which it seems to be perfectly entitled to; xz - yz == (x-y)z holds
in any ring.
Anyway, I'll stop beating the dead horse.
Rasmus
next prev parent reply other threads:[~2014-09-04 15:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-04 10:40 [PATCH] kcmp: Fix standard comparison bug Rasmus Villemoes
2014-09-04 13:29 ` Cyrill Gorcunov
2014-09-04 15:35 ` Rasmus Villemoes [this message]
2014-09-05 17:50 ` Cyrill Gorcunov
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=87sik7tn3k.fsf@rasmusvillemoes.dk \
--to=linux@rasmusvillemoes.dk \
--cc=akpm@linux-foundation.org.openvz.org \
--cc=ebiederm@xmission.com \
--cc=gorcunov@gmail.com \
--cc=hpa@zytor.com \
--cc=linux-kernel@vger.kernel.org \
--cc=stable@vger.kernel.org \
--cc=xemul@parallels.com \
/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.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).