From: Bill Davidsen <davidsen@tmr.com>
To: "Richard B. Johnson" <root@chaos.analogic.com>
Cc: Timothy Miller <miller@techsource.com>,
Chuck Ebbert <76306.1226@compuserve.com>,
Jens Axboe <axboe@suse.de>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] 2.4.21-rc1 pointless IDE noise reduction
Date: Fri, 25 Apr 2003 14:14:48 -0400 (EDT) [thread overview]
Message-ID: <Pine.LNX.3.96.1030425141133.16623E-100000@gatekeeper.tmr.com> (raw)
In-Reply-To: <Pine.LNX.4.53.0304241244430.32333@chaos>
On Thu, 24 Apr 2003, Richard B. Johnson wrote:
> > Two alternatives:
> >
> > (a) !!(x & 0x400)
> >
> > (b) (x & 0x400) >> 10
> >
>
> I meant return ((foo & MASK) && 1);
>
> Try it, you'll like it! No shifts, no jumps.
Sorry, I still find !!(foo & MASK) easier to read, because !! is only used
to convert to boolean. Sort of a "boolean cast" in effect. It jumps out at
you what is intended.
Anyway, a matter of taste, both generate jumpless code.
--
bill davidsen <davidsen@tmr.com>
CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.
next prev parent reply other threads:[~2003-04-25 18:31 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-24 15:25 [PATCH] 2.4.21-rc1 pointless IDE noise reduction Chuck Ebbert
2003-04-24 15:59 ` Richard B. Johnson
2003-04-24 16:31 ` Timothy Miller
2003-04-24 16:46 ` Richard B. Johnson
2003-04-24 17:15 ` Timothy Miller
2003-04-24 18:27 ` Willy Tarreau
2003-04-24 19:00 ` Timothy Miller
2003-04-25 18:14 ` Bill Davidsen [this message]
2003-04-25 18:30 ` Richard B. Johnson
-- strict thread matches above, loose matches on Subject: below --
2003-04-24 23:25 Chuck Ebbert
2003-04-25 15:08 ` Timothy Miller
2003-04-24 9:34 Erik Andersen
2003-04-24 10:28 ` Jens Axboe
2003-04-27 12:21 ` Adrian Bunk
2003-04-27 17:44 ` Erik Andersen
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