From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 4740 invoked by alias); 5 Nov 2010 00:45:14 -0000 Received: (qmail 4726 invoked by uid 22791); 5 Nov 2010 00:45:13 -0000 X-SWARE-Spam-Status: No, hits=-1.8 required=5.0 tests=AWL,BAYES_00,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from mail.codesourcery.com (HELO mail.codesourcery.com) (38.113.113.100) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 05 Nov 2010 00:45:08 +0000 Received: (qmail 10688 invoked from network); 5 Nov 2010 00:45:05 -0000 Received: from unknown (HELO digraph.polyomino.org.uk) (joseph@127.0.0.2) by mail.codesourcery.com with ESMTPA; 5 Nov 2010 00:45:05 -0000 Received: from jsm28 (helo=localhost) by digraph.polyomino.org.uk with local-esmtp (Exim 4.72) (envelope-from ) id 1PEAQS-0007MO-AH; Fri, 05 Nov 2010 00:45:04 +0000 Date: Fri, 05 Nov 2010 00:51:00 -0000 From: "Joseph S. Myers" To: Paul Koning cc: gcc-patches Subject: Re: [PATCH] doc: add pdp11 machine constraints In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org X-SW-Source: 2010-11/txt/msg00477.txt.bz2 On Thu, 4 Nov 2010, Paul Koning wrote: > +Odd numbered general registers (R1, R3, R5). These are used for 16 > +bit multiply operations. "16-bit", with a hyphen. > +@item M > +The integer constant -1. @minus{}1. > +Integer constants -4 through -1 and 1 through 4; shifts by these Likewise, @minus{}4 and @minus{1}. -- Joseph S. Myers joseph@codesourcery.com