From: Nathan Sidwell <nathan@codesourcery.com>
To: Mike Stump <mikestump@comcast.net>
Cc: Mark Mitchell <mark@codesourcery.com>,
Michael Matz <matz@suse.de>,
Richard Guenther <richard.guenther@gmail.com>,
GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [gimple] assignments to volatile
Date: Fri, 09 Jul 2010 07:22:00 -0000 [thread overview]
Message-ID: <4C36CE16.2030200@codesourcery.com> (raw)
In-Reply-To: <3721950A-1FF1-441A-A22E-D19507FC36FB@comcast.net>
On 07/09/10 06:27, Mike Stump wrote:
> On Jul 5, 2010, at 1:59 AM, Nathan Sidwell wrote:
>> Do you have a reference to the C standard that clarifies the difference?
>
> Sure, it would be the part where the edits are when we ask them to regularize the rules with C++ after C++ fixes what they broke. :-) That is why I carefully chose the phrase `what we should do' as opposed to, what the standard says...
>
>> Wrt the std, all those expression-statements have values - the first is an lvalue, the other 2 are rvalues.
>
> Yeah, I know.
>
>> Another example I missed is:
>> expr, vobj;
>>
>> I think that should read vobj.
>
> :-) gcc fetches. I'd not oppose that.
>
>> But AFAICT 'expr, vobj = data;' and 'expr, vobj;' are identically rvalued according to the C std. Is there anything in the std that justifies them behaving differently?
>
> Nope, don't think so, at least in the C standard.
Good, so I think we're all agreed that what the C standard says is not the
behaviour we want.
nathan
--
Nathan Sidwell :: http://www.codesourcery.com :: CodeSourcery
next prev parent reply other threads:[~2010-07-09 7:22 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-21 12:44 Nathan Sidwell
2010-06-21 13:26 ` Richard Guenther
2010-06-21 13:55 ` Michael Matz
2010-06-21 14:07 ` Richard Guenther
2010-06-21 14:09 ` Nathan Sidwell
2010-06-21 14:17 ` Michael Matz
2010-06-21 14:19 ` Richard Guenther
2010-06-21 14:53 ` Michael Matz
2010-06-21 14:17 ` IainS
2010-06-21 14:24 ` Michael Matz
2010-06-21 14:50 ` Nathan Sidwell
2010-06-21 15:24 ` Michael Matz
2010-06-22 11:36 ` Dave Korn
2010-06-23 20:16 ` Mike Stump
2010-06-24 11:51 ` Michael Matz
2010-06-21 15:24 ` Nathan Sidwell
2010-06-21 15:46 ` Michael Matz
2010-06-22 15:37 ` Mark Mitchell
2010-06-22 15:37 ` Jakub Jelinek
2010-06-22 15:57 ` Paul Koning
2010-06-22 15:47 ` Michael Matz
2010-06-22 15:58 ` Mark Mitchell
2010-06-23 11:38 ` Nathan Sidwell
2010-06-23 14:05 ` Mark Mitchell
2010-06-23 14:06 ` Michael Matz
2010-06-23 16:00 ` Richard Guenther
2010-06-23 16:25 ` Paul Koning
2010-06-23 17:13 ` Mark Mitchell
2010-06-23 19:16 ` Mike Stump
2010-06-24 10:22 ` Mark Mitchell
2010-06-24 15:53 ` Mike Stump
2010-06-24 16:00 ` Mark Mitchell
2010-06-24 19:37 ` Mike Stump
2010-06-25 9:37 ` Nathan Sidwell
2010-06-25 19:06 ` Mike Stump
2010-06-25 21:33 ` Mark Mitchell
2010-06-26 9:35 ` Mike Stump
2010-06-26 10:18 ` Mark Mitchell
2010-06-26 12:18 ` Richard Guenther
2010-06-26 19:52 ` Michael Matz
2010-06-26 19:57 ` Mark Mitchell
2010-06-26 20:08 ` Michael Matz
2010-06-26 22:13 ` Mark Mitchell
2010-06-28 9:20 ` Nathan Sidwell
2010-06-28 9:27 ` Nathan Sidwell
2010-06-26 10:20 ` Richard Kenner
2010-06-28 9:52 ` Nathan Sidwell
2010-06-30 22:52 ` Mike Stump
2010-07-05 8:59 ` Nathan Sidwell
2010-07-09 5:27 ` Mike Stump
2010-07-09 7:22 ` Nathan Sidwell [this message]
2010-07-16 8:10 ` Nathan Sidwell
2010-07-16 15:20 ` Mark Mitchell
2010-07-19 8:41 ` Nathan Sidwell
2010-08-13 9:56 ` Nathan Sidwell
2010-08-18 15:32 ` Mark Mitchell
2010-08-18 16:18 ` Richard Guenther
2010-08-18 18:04 ` Mike Stump
2010-08-19 11:11 ` Nathan Sidwell
2010-08-20 4:22 ` Mark Mitchell
2010-08-20 16:59 ` Mike Stump
2010-08-20 18:00 ` H.J. Lu
2010-08-20 18:33 ` Nathan Sidwell
2010-06-25 9:20 ` Nathan Sidwell
2010-06-24 10:23 ` Nathan Sidwell
2010-06-24 17:05 ` Mike Stump
2010-06-24 17:29 ` Paul Koning
2010-06-25 9:26 ` Nathan Sidwell
2010-06-25 18:20 ` Mike Stump
2010-06-28 8:49 ` Nathan Sidwell
2010-07-01 1:02 ` Mike Stump
2010-07-05 9:02 ` Nathan Sidwell
2010-07-09 5:14 ` Mike Stump
2010-07-09 7:20 ` Nathan Sidwell
2010-06-22 15:56 ` Paul Koning
2010-06-22 12:08 ` Nathan Sidwell
2010-06-22 12:25 ` Richard Guenther
2010-06-22 13:12 ` Michael Matz
2010-06-22 13:54 ` Nathan Sidwell
2010-06-22 15:21 ` Michael Matz
2010-06-22 16:12 ` Joseph S. Myers
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