From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 93587 invoked by alias); 30 Oct 2015 20:27:38 -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 93573 invoked by uid 89); 30 Oct 2015 20:27:37 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.2 required=5.0 tests=AWL,BAYES_00,RP_MATCHES_RCVD,SPF_HELO_PASS 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; Fri, 30 Oct 2015 20:27:36 +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 BCA3DFA9D1; Fri, 30 Oct 2015 20:27:35 +0000 (UTC) Received: from localhost.localdomain ([10.3.113.16]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t9UKRZ4W006322; Fri, 30 Oct 2015 16:27:35 -0400 Subject: Re: [PATCH][PR tree-optimization/67892] Use FSM threader to handle backedges To: Andreas Schwab References: <5632474C.50002@redhat.com> <87ziz08nnb.fsf@igel.home> Cc: gcc-patches@gcc.gnu.org From: Jeff Law Message-ID: <5633D2B6.4080201@redhat.com> Date: Fri, 30 Oct 2015 20:45:00 -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: <87ziz08nnb.fsf@igel.home> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2015-10/txt/msg03451.txt.bz2 On 10/30/2015 07:57 AM, Andreas Schwab wrote: > I'm getting this regression on m68k: > > FAIL: gcc.dg/tree-ssa/ssa-thread-11.c scan-tree-dump vrp2 "FSM" > > The generated code looks equivalent, though. Definitely an artifact of differences in branch costing. Pondering the best way to fix. jeff