From owner-freebsd-questions@FreeBSD.ORG Mon Oct 4 21:45:53 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 39193106566C for ; Mon, 4 Oct 2010 21:45:53 +0000 (UTC) (envelope-from emailrob@emailrob.com) Received: from mx04.dls.net (mx04.dls.net [216.145.245.200]) by mx1.freebsd.org (Postfix) with ESMTP id 19FA58FC17 for ; Mon, 4 Oct 2010 21:45:52 +0000 (UTC) Received: from [216.145.235.31] (helo=emailrob.com) by mx04.dls.net with esmtp (Exim 4.69) (envelope-from ) id 1P2sr1-0005Ym-L3; Mon, 04 Oct 2010 16:45:52 -0500 Message-ID: <4CAA3CFE.1060609@emailrob.com> Date: Mon, 04 Oct 2010 21:45:50 +0100 From: spellberg_robert User-Agent: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.0.2) Gecko/20030208 Netscape/7.02 X-Accept-Language: en-us, en MIME-Version: 1.0 To: David Brodbeck , fbsd_questions References: <4CAA3030.3090001@emailrob.com> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: Subject: Re: [fbsd_questions] i386 vs amd64, on intel_64 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Oct 2010 21:45:53 -0000 hmmm ..., you did not answer the question that i asked. per your statement, on i386, amd64 or both ? David Brodbeck wrote: > On Mon, Oct 4, 2010 at 12:51 PM, spellberg_robert wrote: > >> q: if i install an "amd64" version on an "intel_64" platform, >> am i restricted to 16 64_bit registers and 48_bit pointers or >> can i compile for both cpu_models >> [ perhaps, with nothing more complicated than a compiler option ] ? > > > Take a look at gcc's -m32 and -m64 options. >