From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 46152 invoked by alias); 3 Nov 2016 17:22:20 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Received: (qmail 46138 invoked by uid 89); 3 Nov 2016 17:22:20 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-0.9 required=5.0 tests=AWL,BAYES_00,KAM_LAZY_DOMAIN_SECURITY autolearn=no version=3.3.2 spammy=H*Ad:U*davem X-HELO: shards.monkeyblade.net Date: Thu, 03 Nov 2016 17:22:00 -0000 Message-Id: <20161103.132213.598669006383889263.davem@davemloft.net> To: triegel@redhat.com Cc: andreas@gaisler.com, libc-alpha@sourceware.org, adhemerval.zanella@linaro.org, carlos@redhat.com, software@gaisler.com Subject: Re: [RFC][PATCH 0/2] Make sparcv8 work again on cas enabled hardware From: David Miller In-Reply-To: <1478187561.7146.742.camel@localhost.localdomain> References: <1478125983.7146.733.camel@localhost.localdomain> <20161102.225245.471656475226254205.davem@davemloft.net> <1478187561.7146.742.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-SW-Source: 2016-11/txt/msg00108.txt.bz2 From: Torvald Riegel Date: Thu, 03 Nov 2016 16:39:21 +0100 > Is there any difference between the additional CAS on a v8 and the CAS > on a v9? If there should be none (eg, same instruciton encoding etc.), > we wouldn't need a runtime check for this, would we? A quick look at binutils shows that the encoding appears to be the same. > That depends on whether we want to support sparc HW that does have a > CAS. It's still not clear to me whether this is a goal, and if it's a > goal, whether it's a goal for today or for some time in the future. I think there is value in supporting pure-v8, however painful it may be. I personally don't like to see when we drop support for old systems on the floor just because it's too inconvenient or cumbersome to keep them working properly.