From owner-cvs-src@FreeBSD.ORG  Mon Nov 21 00:38:22 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 ACF8216A41F;
	Mon, 21 Nov 2005 00:38:22 +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 35D1643D4C;
	Mon, 21 Nov 2005 00:38:22 +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 jAL0cMUB076846;
	Mon, 21 Nov 2005 00:38:22 GMT (envelope-from bde@repoman.freebsd.org)
Received: (from bde@localhost)
	by repoman.freebsd.org (8.13.1/8.13.1/Submit) id jAL0cMhO076845;
	Mon, 21 Nov 2005 00:38:22 GMT (envelope-from bde)
Message-Id: <200511210038.jAL0cMhO076845@repoman.freebsd.org>
From: Bruce Evans <bde@FreeBSD.org>
Date: Mon, 21 Nov 2005 00:38:22 +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 k_tanf.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, 21 Nov 2005 00:38:22 -0000

bde         2005-11-21 00:38:22 UTC

  FreeBSD src repository

  Modified files:
    lib/msun/src         k_tanf.c 
  Log:
  Use double precision to simplify and optimize a long division.
  
  On athlons, this gives a speedup of 10-20% for tanf() on uniformly
  distributed args in [-2Pi, 2Pi].  (It only directly applies for 43%
  of the args and gives a 16-20% speedup for these (more for AXP than
  A64) and this gives an overall speedup of 10-12% which is all that it
  should; however, it gives an overall speedup of 17-20% with gcc-3.3
  on AXP-A64 by mysteriously effected cases where it isn't executed.)
  
  I originally intended to use double precision for all internals of
  float trig functions and will probably still do this, but benchmarking
  showed that converting to double precision and back is a pessimization
  in cases where a simple float precision calculation works, so it may
  be optimal to switch precisions only when using extra precision is
  much simpler.
  
  Revision  Changes    Path
  1.14      +1 -15     src/lib/msun/src/k_tanf.c