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From: Jamie Lokier <jamie@shareable.org>
To: Chip Salzenberg <chip@pobox.com>
Cc: Willy Tarreau <willy@w.ods.org>,
	Albert Cahalan <albert@users.sourceforge.net>,
	linux-kernel mailing list <linux-kernel@vger.kernel.org>,
	davem@redhat.com
Subject: Re: [PATCH] 2.4.22pre10: {,un}likely_p() macros for pointers
Date: Mon, 11 Aug 2003 03:09:57 +0100	[thread overview]
Message-ID: <20030811020957.GE10446@mail.jlokier.co.uk> (raw)
In-Reply-To: <20030811012337.GI24349@perlsupport.com>

Chip Salzenberg wrote:
> According to Willy Tarreau:
> >   likely => __builtin_expect(!(x), 0)
> > unlikely => __builtin_expect((x), 0)
> 
> Well, I'm not sure about the polarity, but that unlikely() macro isn't
> good -- it the same old problem that first prompted my message, namely
> that it's nonportable when (x) has a pointer type.

It's portable as long as the compiler is GCC :)

-- Jamie

  reply	other threads:[~2003-08-11  2:10 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 [this message]
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
  -- 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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