From: mike stump <mrs@windriver.com>
To: dewar@gnat.com, guerby@acm.org
Cc: gcc@gcc.gnu.org, linux-kernel@vger.kernel.org, paulus@samba.org,
trini@kernel.crashing.org, velco@fadata.bg
Subject: Re: [PATCH] C undefined behavior fix
Date: Mon, 7 Jan 2002 11:18:40 -0800 (PST) [thread overview]
Message-ID: <200201071918.LAA11997@kankakee.wrs.com> (raw)
> From: dewar@gnat.com
> To: dewar@gnat.com, guerby@acm.org, mrs@windriver.com
> Date: Sun, 6 Jan 2002 14:32:01 -0500 (EST)
> Ah ha! But then look again at my 16-bit example, an expert assembly
> langauge programmer will use a 32 bit load if efficiency is not an
> issue (and it does not matter if there are extra bits around), but a
> 16-bit load if the hardware for some reason requires it. How is the
> poort C compiler to distinguish these cases automatically?
When you give the compiler as much information to it as your expert
apparently has, then it will produce the same code, until then,
imagine you told you expert that you want to do a 16 bit fetch for
something that might care if it were not a 16 bit access... If you so
tie your experts hands, as you tie gcc hands, then should produce
similar code.
Now, if you want to invent gcc extensions so that it can know as much
as a domain expert, start proposing those language extensions...
next reply other threads:[~2002-01-07 19:20 UTC|newest]
Thread overview: 202+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-07 19:18 mike stump [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-01-10 19:01 [PATCH] C undefined behavior fix Bernard Dautrevaux
2002-01-10 12:18 dewar
2002-01-10 12:37 ` Erik Trulsson
2002-01-10 15:27 ` Florian Weimer
2002-01-10 9:03 Bernard Dautrevaux
2002-01-10 10:40 ` David Weinehall
2002-01-10 4:33 dewar
2002-01-10 2:16 dewar
2002-01-10 1:22 dewar
2002-01-10 1:21 dewar
2002-01-10 4:37 ` Tim Hollebeek
2002-01-09 21:54 dewar
2002-01-09 20:32 dewar
2002-01-09 21:43 ` Paul Koning
2002-01-09 20:08 dewar
2002-01-09 19:53 mike stump
2002-01-09 20:12 ` Paul Koning
2002-01-09 10:42 dewar
2002-01-09 10:41 Bernard Dautrevaux
2002-01-09 21:59 ` Gérard Roudier
2002-01-09 10:40 dewar
2002-01-09 9:06 Bernard Dautrevaux
2002-01-09 9:25 ` Bernd Petrovitsch
2002-01-09 2:18 dewar
2002-01-09 2:13 dewar
2002-01-09 1:51 mike stump
2002-01-09 1:19 dewar
2002-01-09 0:51 dewar
2002-01-08 11:12 Bernard Dautrevaux
2002-01-11 9:52 ` Horst von Brand
2002-01-08 9:44 Bernard Dautrevaux
2002-01-08 11:44 ` 'jtv'
2002-01-08 0:16 mike stump
2002-01-08 11:33 ` jtv
2002-01-07 23:46 mike stump
2002-01-07 23:20 dewar
2002-01-07 23:15 dewar
2002-01-07 23:12 dewar
2002-01-07 23:11 dewar
2002-01-07 22:56 mike stump
2002-01-07 22:26 Tim McDaniel
2002-01-07 19:36 mike stump
2002-01-07 21:21 ` Theodore Tso
2002-01-08 0:19 ` Paul Mackerras
2002-01-08 1:02 ` Richard Henderson
2002-01-07 19:17 Bernard Dautrevaux
2002-01-07 18:38 mike stump
2002-01-07 13:29 Bernard Dautrevaux
2002-01-07 13:24 Bernard Dautrevaux
2002-01-07 21:49 ` jtv
2002-01-07 22:28 ` Tim Hollebeek
2002-01-07 22:16 ` jtv
2002-01-08 0:27 ` J.A. Magallon
2002-01-08 11:41 ` jtv
2002-01-08 12:36 ` Alexandre Oliva
2002-01-08 12:58 ` jtv
2002-01-09 19:47 ` Gérard Roudier
2002-01-09 20:44 ` jtv
2002-01-09 23:49 ` J.A. Magallon
2002-01-10 0:19 ` Peter Barada
2002-01-10 1:47 ` Fergus Henderson
2002-01-10 15:30 ` Peter Barada
2002-01-10 10:13 ` Matthias Benkmann
2002-01-10 10:44 ` Bernd Petrovitsch
2002-01-06 19:32 dewar
2002-01-06 19:29 dewar
2002-01-06 19:29 dewar
2002-01-06 18:37 mike stump
2002-01-06 18:24 mike stump
2002-01-06 20:37 ` Gabriel Dos Reis
2002-01-06 21:59 ` Paul Mackerras
2002-01-06 22:19 ` Jakub Jelinek
2002-01-07 0:09 ` Tom Rini
2002-01-07 1:40 ` Alexandre Oliva
2002-01-06 18:20 mike stump
2002-01-06 16:22 dewar
2002-01-06 16:39 ` Alan Cox
2002-01-06 19:27 ` Laurent Guerby
2002-01-06 19:43 ` Alan Cox
2002-01-06 13:43 dewar
2002-01-06 13:55 ` Laurent Guerby
2002-01-06 13:41 dewar
2002-01-06 16:58 ` Gabriel Dos Reis
2002-01-06 13:16 dewar
2002-01-06 13:22 ` Gabriel Dos Reis
2002-01-06 13:07 dewar
2002-01-06 13:05 dewar
2002-01-06 13:41 ` Laurent Guerby
2002-01-06 7:56 mike stump
2002-01-06 4:26 dewar
2002-01-06 5:32 ` Paul Mackerras
2002-01-06 11:09 ` Momchil Velikov
2002-01-06 0:52 dewar
2002-01-04 22:43 dewar
2002-01-06 3:40 ` Paul Mackerras
2002-01-04 12:15 dewar
2002-01-04 12:14 dewar
2002-01-03 13:28 dewar
2002-01-04 8:38 ` Florian Weimer
2002-01-04 11:35 ` Joseph S. Myers
2002-01-05 19:25 ` jkl
2002-01-05 19:37 ` Joseph S. Myers
2002-01-05 20:06 ` jkl
2002-01-05 21:42 ` Joseph S. Myers
2002-01-06 4:09 ` Paul Mackerras
2002-01-05 20:01 ` Florian Weimer
2002-01-05 20:17 ` jkl
2002-01-05 20:51 ` Florian Weimer
2002-01-03 12:51 dewar
2002-01-03 10:35 Bernard Dautrevaux
2002-01-03 10:05 Bernard Dautrevaux
2002-01-03 10:49 ` Paul Mackerras
2002-01-03 11:59 ` Lars Brinkhoff
2002-01-03 23:53 ` Paul Mackerras
2002-01-04 9:52 ` Lars Brinkhoff
2002-01-05 6:45 ` Paul Mackerras
2002-01-06 0:20 ` Lars Brinkhoff
2002-01-09 9:28 ` Fergus Henderson
2002-01-09 10:58 ` Gabriel Dos Reis
2002-01-03 0:49 dewar
2002-01-03 0:12 dewar
2002-01-03 0:32 ` jtv
2002-01-06 19:37 ` Alexandre Oliva
2002-01-02 23:53 dewar
2002-01-02 23:59 ` Joe Buck
2002-01-03 3:12 ` Paul Mackerras
2002-01-03 15:45 ` Joe Buck
2002-01-02 17:40 Petr Vandrovec
2002-01-02 22:24 ` David Woodhouse
2002-01-02 22:39 ` Joe Buck
2002-01-02 22:59 ` David Woodhouse
2002-01-03 18:44 ` Alexandre Oliva
2002-01-02 10:02 Bernard Dautrevaux
2002-01-02 23:02 ` Paul Mackerras
2002-01-02 23:27 ` Momchil Velikov
2002-01-01 23:03 Momchil Velikov
2002-01-01 23:43 ` Tom Rini
2002-01-02 6:54 ` Momchil Velikov
2002-01-02 15:39 ` Tom Rini
2002-01-02 15:50 ` Jakub Jelinek
2002-01-02 16:45 ` Paul Koning
2002-01-02 22:56 ` Paul Mackerras
2002-01-02 23:37 ` Momchil Velikov
2002-01-03 2:51 ` Paul Mackerras
2002-01-03 6:29 ` law
2002-01-03 13:16 ` Lars Brinkhoff
2002-01-04 9:05 ` Florian Weimer
2002-01-04 22:14 ` Paul Mackerras
2002-01-02 14:56 ` Joseph S. Myers
2002-01-02 10:29 ` Florian Weimer
2002-01-02 10:41 ` Momchil Velikov
2002-01-02 13:11 ` Jakub Jelinek
2002-01-02 15:54 ` Tom Rini
2002-01-02 11:28 ` Aaron Lehmann
2002-01-02 11:40 ` Momchil Velikov
2002-01-02 15:59 ` Tom Rini
2002-01-02 11:48 ` Alan Cox
2002-01-02 19:09 ` Tom Rini
2002-01-02 20:13 ` Joe Buck
2002-01-02 20:42 ` Tom Rini
2002-01-02 21:36 ` Richard Henderson
2002-01-02 22:05 ` Tom Rini
2002-01-02 22:23 ` jtv
2002-01-02 23:12 ` Tom Rini
2002-01-02 23:45 ` jtv
2002-01-03 0:01 ` Tom Rini
2002-01-03 0:07 ` Richard Henderson
2002-01-03 0:16 ` Tom Rini
2002-01-03 1:12 ` Richard Henderson
2002-01-03 0:20 ` jtv
2002-01-03 2:33 ` Paul Mackerras
2002-01-03 8:32 ` Richard Henderson
2002-01-03 10:10 ` Paul Mackerras
2002-01-03 22:41 ` Tim Hollebeek
2002-01-04 8:48 ` Florian Weimer
2002-01-03 10:03 ` Geert Uytterhoeven
2002-01-03 0:25 ` Alan Cox
2002-01-03 0:35 ` David Woodhouse
2002-01-03 2:10 ` Tom Rini
2002-01-03 22:39 ` Pavel Machek
2002-01-04 9:29 ` Paul Mackerras
2002-01-03 15:46 ` Edgar Toernig
2002-01-03 16:48 ` Momchil Velikov
2002-01-03 17:13 ` jtv
2002-01-03 21:26 ` Daniel Jacobowitz
2002-01-02 22:27 ` Richard Henderson
2002-01-02 22:35 ` Tom Rini
2002-01-02 22:44 ` Richard Henderson
2002-01-02 22:50 ` Tom Rini
2002-01-03 22:40 ` Pavel Machek
2002-01-04 8:42 ` Richard Henderson
2002-01-02 23:11 ` Paul Mackerras
2002-01-02 23:26 ` Tom Rini
2002-01-02 23:28 ` Momchil Velikov
2002-01-02 23:34 ` Tom Rini
2002-01-03 0:19 ` jtv
2002-01-03 0:29 ` Tom Rini
2002-01-03 1:03 ` jtv
2002-01-03 1:17 ` Tom Rini
2002-01-03 17:44 ` jtv
2002-01-04 8:42 ` Florian Weimer
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