From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 64506 invoked by alias); 26 Sep 2016 16:40:04 -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 64466 invoked by uid 89); 26 Sep 2016 16:40:03 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-4.9 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD,SPF_HELO_PASS autolearn=ham version=3.3.2 spammy= 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 ESMTP; Mon, 26 Sep 2016 16:39:57 +0000 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 027A49F720; Mon, 26 Sep 2016 16:39:56 +0000 (UTC) Received: from localhost.localdomain (ovpn-116-2.phx2.redhat.com [10.3.116.2]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u8QGdtkx031142; Mon, 26 Sep 2016 12:39:55 -0400 Subject: Re: [PATCH 2/5] dce: Don't dead-code delete separately wrapped restores To: Segher Boessenkool , gcc-patches@gcc.gnu.org References: Cc: dje.gcc@gmail.com From: Jeff Law Message-ID: Date: Mon, 26 Sep 2016 16:55:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 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: 2016-09/txt/msg01864.txt.bz2 On 09/23/2016 02:21 AM, Segher Boessenkool wrote: > If there is a separately wrapped register restore on some path that > is dead (say, control goes into an endless loop after it), then we > cannot delete that restore because that would confuse the DWARF CFI > (if there is another path joining after this). > This happens with gcc.dg/torture/pr53168.c, for example. > > > 2016-09-23 Segher Boessenkool > > * dce.c (delete_unmarked_insns): Don't delete instructions with > a REG_CFA_RESTORE note. OK and can go in now IMHO. jeff