From owner-cvs-all@FreeBSD.ORG  Tue Sep 30 13:45:16 2003
Return-Path: <owner-cvs-all@FreeBSD.ORG>
Delivered-To: cvs-all@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP
	id 6A8F016A4C1; Tue, 30 Sep 2003 13:45:16 -0700 (PDT)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 2BCE244029; Tue, 30 Sep 2003 13:45:15 -0700 (PDT)
	(envelope-from mux@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.12.9/8.12.9) with ESMTP id h8UKjFXJ021973;
	Tue, 30 Sep 2003 13:45:15 -0700 (PDT)
	(envelope-from mux@repoman.freebsd.org)
Received: (from mux@localhost)
	by repoman.freebsd.org (8.12.9/8.12.9/Submit) id h8UKjE9j021972;
	Tue, 30 Sep 2003 13:45:14 -0700 (PDT)
	(envelope-from mux)
Message-Id: <200309302045.h8UKjE9j021972@repoman.freebsd.org>
From: Maxime Henrion <mux@FreeBSD.org>
Date: Tue, 30 Sep 2003 13:45:14 -0700 (PDT)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
	cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/sys cdefs.h
X-BeenThere: cvs-all@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: CVS commit messages for the entire tree <cvs-all.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-all>
List-Post: <mailto:cvs-all@freebsd.org>
List-Help: <mailto:cvs-all-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-all>,
	<mailto:cvs-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 30 Sep 2003 20:45:16 -0000

mux         2003/09/30 13:45:14 PDT

  FreeBSD src repository

  Modified files:
    sys/sys              cdefs.h 
  Log:
  Introduce new __predict_false(exp) and __predict_true(exp) keywords.
  Their purpose is to give explicit hints to the compiler to judge
  the likelyhood of a test to succeed or fail.  Not all architectures
  have support for such optimizations, but for those who do, it can
  give a nice performance improvement in hot loops.
  
  Obviously, this should be used very rarely in very specific code.
  
  Reviewed by:    peter
  Obtained from:  OpenBSD
  
  Revision  Changes    Path
  1.77      +36 -0     src/sys/sys/cdefs.h