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From: Jamie Lokier <jamie@shareable.org>
To: Willy Tarreau <willy@w.ods.org>
Cc: Albert Cahalan <albert@users.sourceforge.net>,
	linux-kernel mailing list <linux-kernel@vger.kernel.org>,
	davem@redhat.com, chip@pobox.com
Subject: Re: [PATCH] 2.4.22pre10: {,un}likely_p() macros for pointers
Date: Mon, 11 Aug 2003 06:38:30 +0100	[thread overview]
Message-ID: <20030811053830.GM10446@mail.jlokier.co.uk> (raw)
In-Reply-To: <20030811052659.GA28640@alpha.home.local>

Willy Tarreau wrote:
> It may well be when you use it in boolean constructs. The following functions
> return exactly the same result with different code :
> 
> int test1(int u, int v, int x, int y) {
>    return (u > v) || (x > y);
> }
> 
> int test2(int u, int v, int x, int y) {
>    return !!(u > v) | !!(x > y);
> }

Yes, it sounds familiar.  Although my code was not as contrived :) it
was from a real program.  Also, try "x != 0" instead of "!!x" and see
if you get different results.

-- Jamie

  reply	other threads:[~2003-08-11  5:38 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-10  4:03 [PATCH] 2.4.22pre10: {,un}likely_p() macros for pointers Albert Cahalan
2003-08-10  7:29 ` Willy Tarreau
2003-08-10  8:02   ` Willy Tarreau
2003-08-11  1:23   ` Chip Salzenberg
2003-08-11  2:09     ` Jamie Lokier
2003-08-11  2:39       ` Chip Salzenberg
2003-08-11  4:02         ` Albert Cahalan
2003-08-11  4:30         ` Jamie Lokier
2003-08-11  5:30         ` Willy Tarreau
2003-08-11  5:42           ` Jamie Lokier
2003-08-11 13:09             ` Albert Cahalan
2003-08-11 18:55               ` Andrew Morton
2003-08-11 23:13                 ` Albert Cahalan
2003-08-13 19:42                   ` Jamie Lokier
2003-08-11  4:55   ` Jamie Lokier
2003-08-11  5:26     ` Willy Tarreau
2003-08-11  5:38       ` Jamie Lokier [this message]
  -- strict thread matches above, loose matches on Subject: below --
2003-08-05 12:44 Albert Cahalan
2003-08-09  0:21 ` Jamie Lokier
2003-08-09  8:13   ` Willy Tarreau
2003-08-09  8:51     ` David S. Miller
2003-08-09  9:36       ` Jamie Lokier
2003-08-09 10:10       ` Herbert Xu
2003-08-09 10:42       ` Alan Cox
2003-08-09 16:23         ` Jamie Lokier
2003-08-04 17:06 Chip Salzenberg

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