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=ham 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 61299C04EB9 for ; Tue, 4 Dec 2018 01:03:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 34ECB20834 for ; Tue, 4 Dec 2018 01:03:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 34ECB20834 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kernel.crashing.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726036AbeLDBDk (ORCPT ); Mon, 3 Dec 2018 20:03:40 -0500 Received: from gate.crashing.org ([63.228.1.57]:45997 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725943AbeLDBDj (ORCPT ); Mon, 3 Dec 2018 20:03:39 -0500 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 Cc: Nick Desaulniers , Kees Cook , Arnd Bergmann , Jinsong Ji , Linux Kernel Mailing List , linuxppc-dev@lists.ozlabs.org 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 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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