From: Joe Buck <Joe.Buck@synopsys.COM>
To: Robert Dewar <dewar@adacore.com>
Cc: Gabriel Dos Reis <gdr@integrable-solutions.net>,
Andrew Pinski <pinskia@physics.uc.edu>,
gcc mailing list <gcc@gcc.gnu.org>
Subject: Re: signed is undefined and has been since 1992 (in GCC)
Date: Tue, 28 Jun 2005 16:38:00 -0000 [thread overview]
Message-ID: <20050628163810.GC9524@synopsys.com> (raw)
In-Reply-To: <42C14930.40402@adacore.com>
On Tue, Jun 28, 2005 at 08:57:20AM -0400, Robert Dewar wrote:
> Gabriel Dos Reis wrote:
> =
> >Please do remember that this is hardware dependent. If you have
> >problems with x86, it does not mean you have the same witha PPC or a
> >Sparc.
>
> But the whole idea of hardware semantics is bogus, since you are
> assuming some connection between C and the hardware which does not
> exist. C is not an assembly language.
Actually, those of us who work in hardware-software codesign and formal
verification consider exactly such problems, though it ends up being a
comparison of the behavior of two abstract machines, the (idealized)
processor model and the "C machine".
The distinction between an HLL and assembly language is that in the
latter, every program that is accepted by the tool is mapped into some
definite machine language (though the processor architecture will flag
the behavior of some instructions as undefined).
next prev parent reply other threads:[~2005-06-28 16:38 UTC|newest]
Thread overview: 119+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-28 4:08 Andrew Pinski
2005-06-28 4:20 ` Michael Veksler
2005-06-28 9:49 ` Robert Dewar
2005-06-28 4:34 ` Gabriel Dos Reis
2005-06-28 4:50 ` Andrew Pinski
2005-06-28 5:13 ` Gabriel Dos Reis
2005-06-28 5:34 ` Andrew Pinski
2005-06-28 6:01 ` Gabriel Dos Reis
2005-06-28 9:18 ` Robert Dewar
2005-06-28 11:50 ` Gabriel Dos Reis
2005-06-28 12:07 ` Robert Dewar
2005-06-28 12:33 ` Gabriel Dos Reis
2005-06-28 12:57 ` Robert Dewar
2005-06-28 13:19 ` Gabriel Dos Reis
2005-06-28 22:58 ` Georg Bauhaus
2005-06-28 23:53 ` Gabriel Dos Reis
2005-06-29 0:27 ` Robert Dewar
2005-06-29 0:43 ` Gabriel Dos Reis
2005-06-29 0:48 ` Robert Dewar
2005-06-29 1:14 ` Gabriel Dos Reis
2005-06-29 1:21 ` Diego Novillo
2005-06-29 2:19 ` Marcin Dalecki
2005-06-29 3:13 ` Scott Robert Ladd
2005-06-28 14:24 ` Olivier Galibert
2005-06-28 14:28 ` Jonathan Wilson
2005-06-28 14:42 ` Olivier Galibert
2005-06-28 14:39 ` Dave Korn
2005-06-28 14:52 ` Olivier Galibert
2005-06-28 15:01 ` Robert Dewar
2005-06-28 15:04 ` Andrew Haley
2005-06-28 17:18 ` Olivier Galibert
2005-06-28 17:36 ` Dave Korn
2005-06-28 18:02 ` Olivier Galibert
2005-06-28 18:36 ` Dave Korn
2005-06-28 18:56 ` Gabriel Dos Reis
2005-06-28 19:10 ` Olivier Galibert
2005-06-28 19:13 ` Andrew Pinski
2005-06-28 19:20 ` Robert Dewar
2005-06-28 21:48 ` Joe Buck
2005-06-28 19:25 ` Gabriel Dos Reis
2005-06-28 19:32 ` Robert Dewar
2005-06-28 19:48 ` Gabriel Dos Reis
2005-06-28 20:37 ` Robert Dewar
2005-06-28 20:58 ` Gabriel Dos Reis
2005-06-28 21:57 ` Robert Dewar
2005-06-28 21:44 ` Joe Buck
2005-06-28 21:50 ` Olivier Galibert
2005-06-28 21:59 ` Robert Dewar
2005-06-28 18:52 ` Robert Dewar
2005-06-28 19:17 ` Olivier Galibert
2005-06-28 19:21 ` Robert Dewar
2005-06-28 20:18 ` Paul Koning
2005-06-28 20:24 ` Robert Dewar
2005-06-28 21:41 ` Joe Buck
2005-06-28 21:53 ` Michael Veksler
2005-06-28 23:05 ` Michael Veksler
2005-07-02 17:15 ` Florian Weimer
2005-07-02 18:59 ` Gabriel Dos Reis
2005-07-02 23:20 ` Robert Dewar
2005-07-03 0:07 ` Gabriel Dos Reis
2005-07-03 9:49 ` Robert Dewar
2005-07-02 23:12 ` Nicholas Nethercote
2005-07-02 23:20 ` Robert Dewar
2005-07-03 0:13 ` Gabriel Dos Reis
2005-07-03 9:54 ` Robert Dewar
2005-07-03 10:02 ` Florian Weimer
2005-07-03 10:10 ` Robert Dewar
2005-07-03 12:01 ` Gabriel Dos Reis
2005-07-14 7:21 ` Marc Espie
2005-07-02 17:06 ` Florian Weimer
2005-06-28 17:51 ` Joe Buck
2005-06-28 18:21 ` Gabriel Dos Reis
2005-06-28 18:53 ` Robert Dewar
2005-06-28 18:28 ` Olivier Galibert
2005-06-28 18:38 ` Dave Korn
2005-06-28 18:50 ` Robert Dewar
2005-06-28 19:02 ` Gabriel Dos Reis
2005-06-28 19:17 ` Robert Dewar
2005-06-28 19:43 ` Gabriel Dos Reis
2005-06-28 20:31 ` Robert Dewar
2005-06-28 20:51 ` Gabriel Dos Reis
2005-06-28 20:59 ` Robert Dewar
2005-06-28 21:20 ` Gabriel Dos Reis
2005-06-28 21:27 ` Paul Koning
2005-06-28 21:39 ` Andreas Schwab
2005-06-28 21:35 ` Joe Buck
2005-06-28 22:09 ` Joseph S. Myers
2005-06-28 22:16 ` Falk Hueffner
2005-06-29 6:59 ` Eric Botcazou
2005-06-28 22:19 ` Robert Dewar
2005-06-28 16:42 ` Joe Buck
2005-06-28 17:10 ` Dave Korn
2005-06-28 17:21 ` Joe Buck
2005-06-28 22:41 ` Georg Bauhaus
2005-06-28 14:47 ` Gabriel Dos Reis
2005-06-28 16:38 ` Joe Buck [this message]
2005-06-28 21:59 ` Mike Stump
2005-06-28 13:47 ` Gabriel Paubert
2005-06-28 13:52 ` Andrew Pinski
2005-06-28 14:33 ` Robert Dewar
2005-06-28 12:08 ` Robert Dewar
2005-06-28 12:34 ` Gabriel Dos Reis
2005-06-28 7:25 ` Michael Veksler
2005-06-28 16:32 ` Joe Buck
2005-06-28 16:56 ` Joe Buck
2005-06-28 17:03 ` Gabriel Dos Reis
2005-06-28 17:34 ` Joe Buck
2005-06-28 18:09 ` Gabriel Dos Reis
2005-06-28 17:35 ` Diego Novillo
2005-06-28 6:55 ` Steven Bosscher
2005-06-28 7:20 ` Michael Veksler
2005-06-28 7:39 ` Falk Hueffner
2005-06-28 12:08 ` Gabriel Dos Reis
2005-06-28 12:01 ` Gabriel Dos Reis
2005-06-28 16:59 Morten Welinder
2005-06-28 17:23 ` Olivier Galibert
2005-06-28 18:44 ` Michael Veksler
2005-06-28 17:41 Paul Schlie
[not found] <2382433.1119938227627.JavaMail.root@dtm1eusosrv72.dtm.ops.eu.uu.net>
2005-06-28 19:44 ` Toon Moene
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