From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) by sourceware.org (Postfix) with ESMTP id 36147383F85F; Thu, 4 Jun 2020 23:43:05 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 36147383F85F Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=segher@kernel.crashing.org Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id 054NgZQw017974; Thu, 4 Jun 2020 18:42:36 -0500 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id 054NgZ8U017973; Thu, 4 Jun 2020 18:42:35 -0500 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Thu, 4 Jun 2020 18:42:35 -0500 From: Segher Boessenkool To: Joseph Myers Cc: Daniel Kolesa , musl@lists.openwall.com, Rich Felker , Michal =?iso-8859-1?Q?Such=E1nek?= , libc-alpha@sourceware.org, eery@paperfox.es, Will Springer , Palmer Dabbelt via binutils , via libc-dev , linuxppc-dev@lists.ozlabs.org Subject: Re: [musl] Re: ppc64le and 32-bit LE userland compatibility Message-ID: <20200604234234.GN31009@gate.crashing.org> References: <20200602142337.GS25173@kitsune.suse.cz> <3aeb6dfe-ae23-42f9-ac23-16be6b54a850@www.fastmail.com> <20200604171232.GG31009@gate.crashing.org> <20200604171844.GO1079@brightrain.aerifal.cx> <20200604173312.GI31009@gate.crashing.org> <20200604211009.GK31009@gate.crashing.org> <60fa8bd7-2439-4403-a0eb-166a2fb49a4b@www.fastmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i X-Spam-Status: No, score=-11.6 required=5.0 tests=BAYES_00, JMQ_SPF_NEUTRAL, KAM_DMARC_STATUS, RCVD_IN_DNSWL_NONE, TXREP, T_SPF_HELO_PERMERROR, T_SPF_PERMERROR autolearn=no 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: Thu, 04 Jun 2020 23:43:06 -0000 Hi! On Thu, Jun 04, 2020 at 10:08:02PM +0000, Joseph Myers wrote: > > The ELFv2 document specifies things like passing of quadruple precision > > floats. Indeed, VSX is needed there, but that's not a concern if you > > *don't* use quadruple precision floats. > > My understanding is that the registers used for argument passing are all > ones that exactly correspond to the Vector registers in earlier > instruction set versions. In other words, you could *in principle* > produce an object, or a whole libm shared library, [...] And then there is the VRSAVE register, if your OS still uses that. Let's hope not :-) This is similar to what -mno-float128-hardware does (which actually requires VSX hardware for the emulation library currently). Segher