Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S272263AbTHKFiy (ORCPT ); Mon, 11 Aug 2003 01:38:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S272281AbTHKFix (ORCPT ); Mon, 11 Aug 2003 01:38:53 -0400 Received: from mail.jlokier.co.uk ([81.29.64.88]:39557 "EHLO mail.jlokier.co.uk") by vger.kernel.org with ESMTP id S272263AbTHKFiu (ORCPT ); Mon, 11 Aug 2003 01:38:50 -0400 Date: Mon, 11 Aug 2003 06:38:30 +0100 From: Jamie Lokier To: Willy Tarreau Cc: Albert Cahalan , linux-kernel mailing list , davem@redhat.com, chip@pobox.com Subject: Re: [PATCH] 2.4.22pre10: {,un}likely_p() macros for pointers Message-ID: <20030811053830.GM10446@mail.jlokier.co.uk> References: <1060488233.780.65.camel@cube> <20030810072945.GA14038@alpha.home.local> <20030811045531.GH10446@mail.jlokier.co.uk> <20030811052659.GA28640@alpha.home.local> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030811052659.GA28640@alpha.home.local> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 746 Lines: 22 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/