From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-3.1 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 31149 invoked from network); 2 Jun 2020 00:14:19 -0000 Received: from mother.openwall.net (195.42.179.200) by inbox.vuxu.org with ESMTPUTF8; 2 Jun 2020 00:14:19 -0000 Received: (qmail 9881 invoked by uid 550); 2 Jun 2020 00:14:17 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Reply-To: musl@lists.openwall.com Received: (qmail 9848 invoked from network); 2 Jun 2020 00:14:16 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=octaforge.org; h=mime-version:message-id:in-reply-to:references:date:from:to :cc:subject:content-type; s=fm3; bh=u7nl6vCiYmoe/TaULzhjnyR/8bgF vCihC/qqz7J1IG0=; b=rHnySAIZZnzm8CnRGHPTDQTcDtBSy83DWZ+OqD627PIs 8qqliS6lj4QkM4iP6T8Aa+c8hTe6jIjKU5Kotkd2yVoYr1mRTFjZj7T63TeyNVu1 qoiJ2otSdIbwE3fECOkfC6doSAuryqcFkYtzNR4Sgr7o/bN8ioEIzLRtuBfKE7IC uh63HzZ4qtWADR46icQ934E1xLuR2P8mC9N7mbvepLW0I+RB6/pTPFPBQWSSpKQ5 JtoyFKU81X+/hCdAVVI4+8nF2wInX7qtLJDdm/X/4fJ5uMlZxpOb2+rMjg7At9hv oLuMUNs/px5S9BQkEaYdGy+5yfKH5fZcWUwVlP1llg== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm2; bh=u7nl6v CiYmoe/TaULzhjnyR/8bgFvCihC/qqz7J1IG0=; b=ZF+rhq6cBrn2A1lwDdQgv6 0ai//rRpOEYvqDRA+IxtaHQTnn62WjP7FZGQoXiLs24yW1DGio9zhQ1eH1vJbIZy tjLmWIIrZQtsEnzPPl+dON3vYFNVW+uJ1I5lWYEXlLXUF93INxJVkhC69k0akw/d aY/QSC5YAysxVgseyeVxRS4Y7A9p1LXjkaUsrvwwAIzsujsRKY3QMtR5Mv8lRHiA 80fdEVX7v4HuwLWo+FM8cCQeurhQPn7g74UcsRL3kk12v1j2Oopz4SHhILjtw/Kz Qp1N+jW/5rK6xTGJ9sfpnYFK++c9SuBCw9/3l4eHBRUf7J46u9ukkKHkkq0p8tWw == X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduhedrudefiedgfeduucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhepofgfggfkjghffffhvffutgesthdtredtreertdenucfhrhhomhepfdffrghn ihgvlhcumfholhgvshgrfdcuoegurghnihgvlhesohgtthgrfhhorhhgvgdrohhrgheqne cuggftrfgrthhtvghrnhepieevvddvjeehiedtvdelgfeuiefhgfetvdeuhfffteehuddu fffgudfhfffhleefnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilh hfrhhomhepuggrnhhivghlsehotghtrghfohhrghgvrdhorhhg X-ME-Proxy: X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.3.0-dev0-519-g0f677ba-fm-20200601.001-g0f677ba6 Mime-Version: 1.0 Message-Id: <8d6bf678-7fbc-4f4e-94c1-6e33da091f04@www.fastmail.com> In-Reply-To: References: <2047231.C4sosBPzcN@sheen> Date: Tue, 02 Jun 2020 02:13:44 +0200 From: "Daniel Kolesa" To: "Joseph Myers" Cc: libc-alpha@sourceware.org, eery@paperfox.es, musl@lists.openwall.com, "Will Springer" , "Palmer Dabbelt via binutils" , "via libc-dev" , linuxppc-dev@lists.ozlabs.org Content-Type: text/plain Subject: [musl] Re: ppc64le and 32-bit LE userland compatibility On Tue, Jun 2, 2020, at 01:55, Joseph Myers wrote: > On Mon, 1 Jun 2020, Joseph Myers wrote: > > > The minimum supported architecture for powerpc64le (POWER8) has VSX. My > > understanding was that the suggestion was for 32-bit userspace to run > > under powerpc64le kernels running on POWER8 or later, meaning that such a > > 32-bit LE port, and any ABI designed for such a port, can assume VSX is > > available. Or does VSX not work, at the hardware level, for 32-bit > > POWER8? (In which case you could pick another ABI for binary128 argument > > passing and return.) > > In fact, my understanding is that the ABI for passing binary128 values in > vector registers is perfectly implementable for processors with just VMX > (AltiVec) and not VSX. So if you do want to support binary128 for a new > ABI for either 32-bit LE or 32-bit or 64-bit BE, you don't need to require > VSX for that ABI, you just need to change any GCC requirement for VSX for > binary128 to allow it with VMX when building for your new ABI. Which still doesn't help us even if true, since we plan to support hardware that doesn't have any kind of vector functionality in the first place (PowerPC G3/G4, and for the ELFv2 64-bit BE port, the minimum for binary packages is 970/G5 which does have AltiVec, but it is also supported to build your userland from source without this, for e.g. POWER5 machines, or e5500 SoCs) > > -- > Joseph S. Myers > joseph@codesourcery.com >