From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-1.mimecast.com (us-smtp-delivery-1.mimecast.com [207.211.31.120]) by sourceware.org (Postfix) with ESMTP id 4704939B0413 for ; Wed, 22 Jul 2020 08:44:56 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 4704939B0413 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-49-qtN8SAiIOH-0I8GQlKpuGw-1; Wed, 22 Jul 2020 04:44:52 -0400 X-MC-Unique: qtN8SAiIOH-0I8GQlKpuGw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8A1F7107BEF7; Wed, 22 Jul 2020 08:44:51 +0000 (UTC) Received: from oldenburg2.str.redhat.com (ovpn-112-135.ams2.redhat.com [10.36.112.135]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C32C110013C1; Wed, 22 Jul 2020 08:44:49 +0000 (UTC) From: Florian Weimer To: Dongsheng Song Cc: "Mallappa\, Premachandra" , "gcc\@gcc.gnu.org" , Tom Stellard , "libc-alpha\@sourceware.org" , "llvm-dev\@lists.llvm.org" , "x86-64-abi\@googlegroups.com" Subject: Re: New x86-64 micro-architecture levels References: <87365zz3a6.fsf@oldenburg2.str.redhat.com> <87imegn3s0.fsf@oldenburg2.str.redhat.com> Date: Wed, 22 Jul 2020 10:44:48 +0200 In-Reply-To: (Dongsheng Song's message of "Wed, 22 Jul 2020 09:31:33 +0800") Message-ID: <87d04oj5vj.fsf@oldenburg2.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-3.8 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Jul 2020 08:44:58 -0000 * Dongsheng Song: > I fully agree these names (100/101, A/B/C/D) are not very intuitive, I > recommend using isa tags by year (e.g. x64_2010, x64_2014) like the > python's platform tags (e.g. manylinux2010, manylinux2014). I started out with a year number, but that was before the was Level A. Too many new CPUs only fall under level A unfortunately because they do not even have AVX. This even applies to some new server CPU designs released this year. I'm concerned that putting a year into the level name suggests that everything main-stream released after that year supports that level, and that's not true. I think for manylinux, it's different, and it actually works out there. No one is building a new GNU/Linux distribution that is based on glibc 2.12 today, for example. But not so much for x86 CPUs. If you think my worry is unfounded, then a year-based approach sounds compelling. Thanks, Florian