From: Duncan Sands <baldrick@wanadoo.fr>
To: "Martin J. Bligh" <mbligh@aracnet.com>, Andrew Morton <akpm@digeo.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: BUGed to death
Date: Tue, 15 Apr 2003 16:58:10 +0200 [thread overview]
Message-ID: <200304151658.10495.baldrick@wanadoo.fr> (raw)
In-Reply-To: <70620000.1050417924@[10.10.2.4]>
> > No, I meant what happens if BUG() is non-trivial and BUG_ON is a no-op.
> > I thought it might give an indication of whether time was being lost
> > evaluating the condition (occurs with BUG and BUG_ON), or mispredicting
> > the branch (only occurs with BUG).
>
> Mmmm. wouldn't that just optimise away the BUG_ONs, but not the BUGs ?
> Which will tell you something, but I'm not sure anything interesting.
> My impression is that if I do:
>
> if (foo)
> do {} while (0);
>
> the compiler will just ditch the whole thing, and not evaluate foo.
> I'll admit to not having checked that, but still ....
Good point. So much for trying to get info without converting a bunch
of BUG's into BUG_ON's...
Duncan.
next prev parent reply other threads:[~2003-04-15 14:46 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-14 20:19 Martin J. Bligh
2003-04-14 20:40 ` Duncan Sands
2003-04-14 21:02 ` Dave Jones
2003-04-14 21:10 ` Duncan Sands
2003-04-14 21:17 ` Dave Jones
2003-04-15 11:57 ` Duncan Sands
2003-04-15 12:05 ` Dave Jones
2003-04-15 14:39 ` Martin J. Bligh
2003-04-23 15:08 ` Duncan Sands
2003-04-14 21:00 ` Dave Jones
2003-04-14 20:55 ` Martin J. Bligh
2003-04-14 21:08 ` Dave Jones
2003-04-14 21:50 ` Andrew Morton
2003-04-14 21:55 ` Dave Jones
2003-04-15 0:23 ` H. Peter Anvin
2003-04-15 12:01 ` Duncan Sands
2003-04-15 12:31 ` Jens Axboe
2003-04-15 12:36 ` Dave Jones
2003-04-15 12:40 ` Jens Axboe
2003-04-15 12:49 ` Sean Neakums
2003-04-15 12:52 ` Sean Neakums
2003-04-15 13:01 ` Roman Zippel
2003-04-15 13:17 ` Jens Axboe
2003-04-15 13:55 ` Duncan Sands
2003-04-15 14:22 ` Jens Axboe
2003-04-15 14:35 ` Martin J. Bligh
2003-04-15 14:39 ` Duncan Sands
2003-04-15 14:45 ` Martin J. Bligh
2003-04-15 14:58 ` Duncan Sands [this message]
2003-04-15 14:30 rwhron
2003-04-15 15:57 ` Dave Jones
2003-04-15 16:11 ` Nick Piggin
2003-04-15 16:42 ` Michael Buesch
2003-04-15 16:45 ` Dave Jones
2003-04-15 18:33 Chuck Ebbert
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