From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: drivers/char/sysrq.c
Date: 30 May 2003 13:24:41 -0700 [thread overview]
Message-ID: <bb8em9$f3j$1@cesium.transmeta.com> (raw)
In-Reply-To: 20030530151317.GA3973@werewolf.able.es
Followup to: <20030530151317.GA3973@werewolf.able.es>
By author: "J.A. Magallon" <jamagallon@able.es>
In newsgroup: linux.dev.kernel
>
> I see a diff:
> - & is bitwise and you always perform the op
> - && is logical and gcc must shortcut it
>
> I think people use & 'cause they prefer the extra argument calculation
> than the branch for the shortcut (AFAIR...)
>
> or not ?
>
In this case it doesn't matter, since gcc should be able to prove the
right-hand-side is side-effect free.
-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
Architectures needed: ia64 m68k mips64 ppc ppc64 s390 s390x sh v850 x86-64
next prev parent reply other threads:[~2003-05-30 20:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-30 14:44 drivers/char/sysrq.c Margit Schubert-While
2003-05-30 14:58 ` drivers/char/sysrq.c Jörn Engel
2003-05-30 15:13 ` drivers/char/sysrq.c J.A. Magallon
2003-05-30 18:01 ` drivers/char/sysrq.c Jörn Engel
2003-05-30 20:24 ` H. Peter Anvin [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-05-30 16:11 drivers/char/sysrq.c Margit Schubert-While
2003-05-31 3:18 ` drivers/char/sysrq.c Valdis.Kletnieks
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