From owner-cvs-src@FreeBSD.ORG  Mon Nov 28 06:15:11 2005
Return-Path: <owner-cvs-src@FreeBSD.ORG>
X-Original-To: cvs-src@FreeBSD.org
Delivered-To: cvs-src@FreeBSD.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 9E7DD16A41F;
	Mon, 28 Nov 2005 06:15:11 +0000 (GMT) (envelope-from bde@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP id F238443D5C;
	Mon, 28 Nov 2005 06:15:10 +0000 (GMT) (envelope-from bde@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.13.1/8.13.1) with ESMTP id jAS6FA9i052830;
	Mon, 28 Nov 2005 06:15:10 GMT (envelope-from bde@repoman.freebsd.org)
Received: (from bde@localhost)
	by repoman.freebsd.org (8.13.1/8.13.1/Submit) id jAS6FACG052829;
	Mon, 28 Nov 2005 06:15:10 GMT (envelope-from bde)
Message-Id: <200511280615.jAS6FACG052829@repoman.freebsd.org>
From: Bruce Evans <bde@FreeBSD.org>
Date: Mon, 28 Nov 2005 06:15:10 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Cc: 
Subject: cvs commit: src/lib/msun/src s_cosf.c s_sinf.c
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 28 Nov 2005 06:15:11 -0000

bde         2005-11-28 06:15:10 UTC

  FreeBSD src repository

  Modified files:
    lib/msun/src         s_cosf.c s_sinf.c 
  Log:
  Exploit skew-symmetry to avoid an operation: -sin(x-A) = sin(A-x).  This
  gives a tiny but hopefully always free optimization in the 2 quadrants
  to which it applies.  On Athlons, it reduces maximum latency by 4 cycles
  in these quadrants but has usually has a smaller effect on total time
  (typically ~2 cycles (~5%), but sometimes 8 cycles when the compiler
  generates poor code).
  
  Revision  Changes    Path
  1.14      +2 -2      src/lib/msun/src/s_cosf.c
  1.14      +2 -2      src/lib/msun/src/s_sinf.c