From: Pavel Machek <pavel@suse.cz>
To: Ulrich Drepper <drepper@cygnus.com>
Cc: "Adam J. Richter" <adam@yggdrasil.com>, linux-kernel@vger.kernel.org
Subject: Re: List of all-zero .data variables in linux-2.4.3 available
Date: Mon, 16 Apr 2001 14:33:21 +0000 [thread overview]
Message-ID: <20010416143320.A40@(none)> (raw)
In-Reply-To: <200104121929.MAA04049@adam.yggdrasil.com> <m33dbdsy8r.fsf@otr.mynet.cygnus.com>
In-Reply-To: <m33dbdsy8r.fsf@otr.mynet.cygnus.com>; from drepper@redhat.com on Thu, Apr 12, 2001 at 12:40:20PM -0700
Hi!
> > I am aware of a couple of cases where code relied on static
> > variables being allocated contiguously, but, in both cases, those
> > variables were either all zeros or all non-zeros, so my proposed
> > change would not break such code.
>
> Continuous placement is not the only property defined by
> initialization. There are many more. You cannot change this since it
> will quite a few programs and libraries and subtle and hard to
> impossible to identify ways. Simply educate programmers to not
> initialize.
Unless ansiC specifies such behaviour, such code is buggy. And buggy
code should be fixed, not be used as argument against optimalization.
[Of course, you can turn off that optimalization for buggy code, if code
is too ugly to fix.]
--
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.
next prev parent reply other threads:[~2001-04-16 21:21 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-04-12 19:29 List of all-zero .data variables in linux-2.4.3 available Adam J. Richter
2001-04-12 19:40 ` Ulrich Drepper
2001-04-16 14:33 ` Pavel Machek [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-04-12 20:04 Adam J. Richter
2001-04-12 19:50 Adam J. Richter
2001-04-12 19:01 Adam J. Richter
2001-04-12 19:14 ` Ulrich Drepper
2001-04-12 21:27 ` H. Peter Anvin
2001-04-12 12:36 Adam J. Richter
2001-04-12 14:44 ` johan.adolfsson
2001-04-12 14:57 ` Russell King
2001-04-12 15:28 ` Richard B. Johnson
2001-04-12 19:52 ` Jeff Garzik
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