From: Andi Kleen <ak@novell.com>
To: "linux-os (Dick Johnson)" <linux-os@analogic.com>
Cc: "Nick Piggin" <nickpiggin@yahoo.com.au>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Linus Torvalds" <torvalds@linux-foundation.org>
Subject: Re: Is gcc thread-unsafe?
Date: Thu, 25 Oct 2007 14:16:19 +0200 [thread overview]
Message-ID: <200710251416.19606.ak@novell.com> (raw)
In-Reply-To: <Pine.LNX.4.61.0710250753350.22665@chaos.analogic.com>
On Thursday 25 October 2007 13:58:56 linux-os (Dick Johnson) wrote:
>
> On Thu, 25 Oct 2007, Andi Kleen wrote:
>
> > On Thursday 25 October 2007 05:24, Nick Piggin wrote:
> >
> >> Basically, what the gcc developers are saying is that gcc is
> >> free to load and store to any memory location, so long as it
> >> behaves as if the instructions were executed in sequence.
> >
> > This case is clearly a bug, a very likely code pessimization.
> > I guess it wasn't intentional, just an optimization that is useful
> > for local register values doing too much.
>
>
> I don't think it is a BUG,
Bug as in an optimization that makes the code slower than it was
before. That is clearly a bug in a compiler.
-Andi
next prev parent reply other threads:[~2007-10-25 12:16 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-25 3:24 Is gcc thread-unsafe? Nick Piggin
2007-10-25 3:46 ` Arjan van de Ven
2007-10-25 3:58 ` Nick Piggin
2007-10-25 4:29 ` David Schwartz
2007-10-25 4:35 ` Arjan van de Ven
2007-10-25 18:45 ` Måns Rullgård
2007-10-25 4:47 ` Nick Piggin
2007-10-25 9:40 ` Samuel Tardieu
2007-10-25 9:44 ` Samuel Tardieu
2007-10-25 9:54 ` Samuel Tardieu
2007-10-25 9:55 ` Andi Kleen
2007-10-25 7:15 ` Andi Kleen
2007-10-25 11:58 ` linux-os (Dick Johnson)
2007-10-25 12:16 ` Andi Kleen [this message]
2007-10-25 22:49 ` Nick Piggin
2007-10-25 23:09 ` Andi Kleen
2007-10-25 23:14 ` Linus Torvalds
2007-10-25 23:16 ` Andi Kleen
2007-10-25 23:32 ` Linus Torvalds
2007-10-25 23:42 ` Andi Kleen
2007-10-25 23:57 ` Linus Torvalds
2007-10-26 1:15 ` Zachary Amsden
2007-10-26 4:57 ` Willy Tarreau
2007-10-25 23:43 ` Nick Piggin
2007-10-25 23:55 ` Andi Kleen
2007-10-25 23:57 ` Nick Piggin
2007-10-25 14:55 ` Linus Torvalds
2007-10-25 15:12 ` Pekka Enberg
2007-10-25 21:42 ` David Schwartz
2007-10-25 23:22 ` Nick Piggin
2007-10-26 11:59 ` Andrew Haley
2007-10-26 17:39 ` Chris Friesen
2007-10-26 11:59 ` Andrew Haley
2007-10-25 22:26 ` Ismail Dönmez
2007-10-25 22:56 ` Jeff Garzik
2007-10-25 23:04 ` Jeff Garzik
2007-10-31 22:10 ` Phillip Susi
[not found] <fa.JbRGo0cQWncrcfKHmiNdvchsA50@ifi.uio.no>
[not found] ` <fa.8qDECVaPIo7DWbjhQbyw6N5Infg@ifi.uio.no>
[not found] ` <fa.M4DOMggyrQmdTqekWSuw4xCxiTc@ifi.uio.no>
2007-10-25 23:27 ` Robert Hancock
[not found] <e2e108260710260729x4603211cgb68d7434ce1e54e9@mail.gmail.com>
2007-10-26 14:40 ` Bart Van Assche
2007-10-26 15:09 ` Linus Torvalds
2007-10-26 15:34 ` Andrew Haley
2007-10-26 18:06 ` David Schwartz
2007-10-30 10:20 ` Andrew Haley
2007-11-02 15:29 ` Bart Van Assche
2007-11-02 15:38 ` Andrew Haley
2007-11-04 15:13 ` Bart Van Assche
2007-11-04 17:45 ` Linus Torvalds
2007-11-04 17:58 ` Andrew Haley
2007-11-04 18:06 ` Bart Van Assche
2007-11-02 17:18 ` David Schwartz
2007-10-26 21:45 ` Giacomo Catenazzi
2007-10-26 22:24 ` Linus Torvalds
2007-10-26 15:27 ` Linus Torvalds
2007-10-26 16:28 ` Linus Torvalds
2007-10-26 17:07 ` Bart Van Assche
2007-10-26 17:12 ` Andrew Haley
2007-10-26 17:25 ` Linus Torvalds
2007-10-26 18:08 ` Alan Cox
2007-10-26 18:14 ` Linus Torvalds
2007-10-26 20:39 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2007-10-28 18:19 linux
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=200710251416.19606.ak@novell.com \
--to=ak@novell.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-os@analogic.com \
--cc=nickpiggin@yahoo.com.au \
--cc=torvalds@linux-foundation.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.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox