From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 62815 invoked by alias); 9 Dec 2015 15:48:34 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 62750 invoked by uid 89); 9 Dec 2015 15:48:33 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.8 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS,T_RP_MATCHES_RCVD autolearn=ham version=3.3.2 X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Wed, 09 Dec 2015 15:48:31 +0000 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (Postfix) with ESMTPS id BEF0942E5CE; Wed, 9 Dec 2015 15:48:29 +0000 (UTC) Received: from localhost.localdomain (vpn1-6-195.ams2.redhat.com [10.36.6.195]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id tB9FmSer028607; Wed, 9 Dec 2015 10:48:28 -0500 Subject: Re: [PATCH] Make basic asm implicitly clobber memory, pr24414 To: Bernd Edlinger , "gcc-patches@gcc.gnu.org" References: <56680B27.5090405@redhat.com> Cc: Richard Biener , Jeff Law From: Bernd Schmidt Message-ID: <56684D4B.9020308@redhat.com> Date: Wed, 09 Dec 2015 15:48:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2015-12/txt/msg01018.txt.bz2 On 12/09/2015 04:09 PM, Bernd Edlinger wrote: > So would you agree on the general direction of the patch, > if I drop the hunk in sched-deps.c ? I'm not sure there was any consensus in that other thread, but I think assuming that basic asms clobber memory and CC, can be justified. That certainly seems like a safer default. Ideally though I think it would be best if we could deprecate basic asms in functions, or at least warn about them in -Wall. Bernd