From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 939E5C04EB9 for ; Tue, 4 Dec 2018 01:08:32 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1A89B20850 for ; Tue, 4 Dec 2018 01:08:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1A89B20850 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4383dp0T24zDqXl for ; Tue, 4 Dec 2018 12:08:30 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: lists.ozlabs.org; spf=permerror (mailfrom) smtp.mailfrom=kernel.crashing.org (client-ip=63.228.1.57; helo=gate.crashing.org; envelope-from=segher@kernel.crashing.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4383Ww5xJfzDqbW for ; Tue, 4 Dec 2018 12:03:24 +1100 (AEDT) Received: from gate.crashing.org (localhost.localdomain [127.0.0.1]) by gate.crashing.org (8.14.1/8.14.1) with ESMTP id wB4138Lj002163; Mon, 3 Dec 2018 19:03:08 -0600 Received: (from segher@localhost) by gate.crashing.org (8.14.1/8.14.1/Submit) id wB3NOgsV026184; Mon, 3 Dec 2018 17:24:42 -0600 X-Authentication-Warning: gate.crashing.org: segher set sender to segher@kernel.crashing.org using -f Date: Mon, 3 Dec 2018 17:24:41 -0600 From: Segher Boessenkool To: Joel Stanley Subject: Re: [PATCH v2] raid6/ppc: Fix build for clang Message-ID: <20181203232440.GB3803@gate.crashing.org> References: <20181102004455.10157-1-joel@jms.id.au> 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-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kees Cook , Arnd Bergmann , Jinsong Ji , Nick Desaulniers , Linux Kernel Mailing List , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Dec 04, 2018 at 08:43:47AM +1030, Joel Stanley wrote: > On Tue, 4 Dec 2018 at 05:15, Nick Desaulniers wrote: > > > > > +ifdef CONFIG_CC_IS_CLANG > > > > > +# clang ppc port does not yet support -maltivec when -msoft-float is > > > > > +# enabled. A future release of clang will resolve this > > > > > +# https://bugs.llvm.org/show_bug.cgi?id=31177 > > As in clang itself crashes, and cc-option/kbuild can't handle that gracefully? > > The developer gets something like this: > > SplitVectorResult #0: t196: v16i8 = llvm.ppc.altivec.vcmpgtsb > TargetConstant:i64<4823>, t146, t195 > fatal error: error in backend: Do not know how to split the result of > this operator! > clang-8: error: clang frontend command failed with exit code 70 (use > -v to see invocation) -msoft-float simply means not to use FPRs, and nothing more or less, so that is a pretty interesting failure (will probably turn out to be a typo or something else boring, but it is fun while it lasts). Segher