From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Miles Bader Newsgroups: gmane.emacs.devel Subject: Re: Untagging by subtraction instead of masking on USE_LSB_TAG Date: Mon, 28 Jan 2008 13:25:30 +0900 Message-ID: References: <87ve5ezjwp.fsf@ambire.localdomain> Reply-To: Miles Bader NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1201494351 31692 80.91.229.12 (28 Jan 2008 04:25:51 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 28 Jan 2008 04:25:51 +0000 (UTC) Cc: YAMAMOTO Mitsuharu , emacs-devel@gnu.org To: Thien-Thi Nguyen Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Jan 28 05:26:11 2008 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1JJLZT-0000Jz-8M for ged-emacs-devel@m.gmane.org; Mon, 28 Jan 2008 05:26:11 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1JJLZ2-0001Je-F9 for ged-emacs-devel@m.gmane.org; Sun, 27 Jan 2008 23:25:44 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1JJLYy-0001JO-JG for emacs-devel@gnu.org; Sun, 27 Jan 2008 23:25:40 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1JJLYw-0001JC-6E for emacs-devel@gnu.org; Sun, 27 Jan 2008 23:25:39 -0500 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1JJLYw-0001J9-1b for emacs-devel@gnu.org; Sun, 27 Jan 2008 23:25:38 -0500 Original-Received: from tyo202.gate.nec.co.jp ([202.32.8.206]) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1JJLYs-0000BU-BN; Sun, 27 Jan 2008 23:25:34 -0500 Original-Received: from relay21.aps.necel.com ([10.29.19.50]) by tyo202.gate.nec.co.jp (8.13.8/8.13.4) with ESMTP id m0S4PWq7020368; Mon, 28 Jan 2008 13:25:32 +0900 (JST) Original-Received: from relay11.aps.necel.com ([10.29.19.24] [10.29.19.24]) by relay21.aps.necel.com with ESMTP; Mon, 28 Jan 2008 13:25:31 +0900 Original-Received: from dhapc248.dev.necel.com ([10.114.112.215] [10.114.112.215]) by relay11.aps.necel.com with ESMTP; Mon, 28 Jan 2008 13:25:30 +0900 Original-Received: by dhapc248.dev.necel.com (Postfix, from userid 31295) id 9B5995AC; Mon, 28 Jan 2008 13:25:30 +0900 (JST) System-Type: i686-pc-linux-gnu Blat: Foop In-Reply-To: (Miles Bader's message of "Mon, 28 Jan 2008 13:22:38 +0900") Original-Lines: 16 X-detected-kernel: by monty-python.gnu.org: Solaris 8 (1) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:87682 Archived-At: Miles Bader writes: > Note that the important value here is the EA, not the offset. Typically > in a LSB tag scheme, the tags are arranged so that after adding these > "funny" offsets, the resulting EA is aligned properly. BTW, such a method won't work on architectures where offsets are inherently aligned -- for instance, doesn't the x86 implicitly scale the offset by the size of the value being loaded? Does anybody know what is usually done on such an architecture? Thanks, -Miles -- Year, n. A period of three hundred and sixty-five disappointments.