From owner-freebsd-current Fri Sep 6 18:50:47 2002 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9407C37B400; Fri, 6 Sep 2002 18:50:37 -0700 (PDT) Received: from alpha.yumyumyum.org (dsl092-171-091.wdc1.dsl.speakeasy.net [66.92.171.91]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6D70343E4A; Fri, 6 Sep 2002 18:50:36 -0700 (PDT) (envelope-from culverk@yumyumyum.org) Received: from alpha.yumyumyum.org (localhost [127.0.0.1]) by alpha.yumyumyum.org (8.12.5/8.12.5) with ESMTP id g871nfEN047994; Fri, 6 Sep 2002 21:49:42 -0400 (EDT) (envelope-from culverk@yumyumyum.org) Received: from localhost (culverk@localhost) by alpha.yumyumyum.org (8.12.5/8.12.5/Submit) with ESMTP id g871nfF8047991; Fri, 6 Sep 2002 21:49:41 -0400 (EDT) (envelope-from culverk@yumyumyum.org) X-Authentication-Warning: alpha.yumyumyum.org: culverk owned process doing -bs Date: Fri, 6 Sep 2002 21:49:41 -0400 (EDT) From: Kenneth Culver To: Kris Kennaway Cc: Maxime Henrion , , , Subject: Re: HEADS UP: SSE instructions (Re: cvs commit: src/share/mk bsd.cpu.mk) In-Reply-To: <20020907014136.GB85013@xor.obsecurity.org> Message-ID: <20020906214850.J46717-100000@alpha.yumyumyum.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Spam-Status: No, hits=-2.1 required=5.0 tests=IN_REP_TO,X_AUTH_WARNING,NO_MX_FOR_FROM,AWL version=2.31 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > I assume the compiler is not stupid enough to try and use both when that > is impossible. Don't forget this is all just passing a CPU name to gcc > which actually decides what instructions to use. That's not what I mean... What I mean is that if one application is using SSE, and the other wants to use 3dnow, this will incur a performance penalty (although I'm not sure how much or how noticable it is), so some people may not want to have SSE enabled. Ken To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message