From owner-cvs-src@FreeBSD.ORG Mon Nov 10 20:33:29 2003 Return-Path: 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 7BF9316A4CE for ; Mon, 10 Nov 2003 20:33:29 -0800 (PST) Received: from vette.gigo.com (vette.gigo.com [216.218.228.114]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4BA0C43FB1 for ; Mon, 10 Nov 2003 20:33:24 -0800 (PST) (envelope-from lioux@brturbo.com) Received: from 200.101.111.208 (200-101-111-208.bsace705.dsl.brasiltelecom.net.br [200.101.111.208]) by vette.gigo.com (Postfix) with ESMTP id A2CA956C4 for ; Mon, 10 Nov 2003 20:31:48 -0800 (PST) Received: (qmail 31923 invoked by uid 1001); 11 Nov 2003 04:14:42 -0000 Message-ID: <20031111041442.31922.qmail@exxodus.fedaykin.here> Received: (qmail 74214 invoked from network); 26 Oct 2003 11:17:38 -0000 Received: from unknown (HELO localhost) (unknown) by unknown with SMTP; 26 Oct 2003 11:17:38 -0000 Received: from pop3.uol.com.br by localhost with POP3 (fetchmail-6.2.5) for lioux-freebsd@localhost (single-drop); Sun, 26 Oct 2003 09:17:16 -0200 (BRST) Received: from peart.uol.com.br (172.26.5.186) by mtauol7.mail.sys.intranet (5.1.071) id 3EDB5C0C01D6F8E6 for lioux-freebsd@uol.com.br; Sun, 26 Oct 2003 08:14:22 -0300 Received: from mx2.freebsd.org (mx2.freebsd.org [216.136.204.119]) by storm6.uol.com.br (Postfix) with ESMTP id 7FE75D414 for ; Sun, 26 Oct 2003 09:14:22 -0200 (BRST) Received: from hub.freebsd.org (hub.freebsd.org [216.136.204.18]) by mx2.freebsd.org (Postfix) with ESMTP id 93D4856687 for ; Sun, 26 Oct 2003 03:14:21 -0800 (PST) (envelope-from owner-src-committers@FreeBSD.org) Received: by hub.freebsd.org (Postfix) id DC01016A4E7; Sun, 26 Oct 2003 03:14:18 -0800 (PST) Delivered-To: lioux@freebsd.org Received: by hub.freebsd.org (Postfix, from userid 538) id B0D0416A4C0; Sun, 26 Oct 2003 03:14:17 -0800 (PST) Delivered-To: src-committers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0EACE16A4B3; Sun, 26 Oct 2003 03:13:46 -0800 (PST) Received: from mail.broadpark.no (mail.broadpark.no [217.13.4.2]) by mx1.FreeBSD.org (Postfix) with ESMTP id EF2C143F85; Sun, 26 Oct 2003 03:13:42 -0800 (PST) (envelope-from des@des.no) Received: from smtp.des.no (37.80-203-228.nextgentel.com [80.203.228.37]) by mail.broadpark.no (Postfix) with ESMTP id 230D979A5B; Sun, 26 Oct 2003 12:13:42 +0100 (MET) Received: by smtp.des.no (Pony Express, from userid 666) id D6E039C044; Sun, 26 Oct 2003 12:13:41 +0100 (CET) Received: from dwp.des.no (dwp.des.no [10.0.0.4]) by smtp.des.no (Pony Express) with ESMTP id 246D49BFF3; Sun, 26 Oct 2003 12:13:38 +0100 (CET) Received: by dwp.des.no (Postfix, from userid 2602) id 07946B823; Sun, 26 Oct 2003 12:13:38 +0100 (CET) To: Peter Wemm References: <20031026064145.18F0E2A8D5@canning.wemm.org> From: des@des.no (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=) In-Reply-To: <20031026064145.18F0E2A8D5@canning.wemm.org> (Peter Wemm's message of "Sat, 25 Oct 2003 23:41:45 -0700") User-Agent: Gnus/5.090024 (Oort Gnus v0.24) Emacs/21.3 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on dsa.des.no X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.60 Sender: owner-src-committers@FreeBSD.org Precedence: bulk X-Loop: FreeBSD.ORG cc: Jeff Roberson cc: src-committers@FreeBSD.org cc: cvs-all@FreeBSD.org cc: cvs-src@FreeBSD.org Subject: Re: cvs commit: src/sys/i386/i386 pmap.c X-BeenThere: cvs-src@freebsd.org X-Mailman-Version: 2.1.1 List-Id: CVS commit messages for the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Date: Tue, 11 Nov 2003 04:33:29 -0000 X-Original-Date: Sun, 26 Oct 2003 12:13:37 +0100 X-List-Received-Date: Tue, 11 Nov 2003 04:33:29 -0000 Peter Wemm writes: > Massively deep pipelines help get the MHz up, and careful optimization can > stop it affecting frame rates. But it blows chunks if you mispredict a > branch in typical gcc generated code. Or take our libc syscall stubs.. > every single one will be mispredicted because the usual case (no errors) > has an opposite direction branch to what intel's static branch prediction > expects. Is there any way to teach (or trick) gcc to generate a branch which the p4 will predict correctly? DES --=20 Dag-Erling Sm=F8rgrav - des@des.no