From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 833 invoked by alias); 13 Nov 2015 11:19:58 -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 824 invoked by uid 89); 13 Nov 2015 11:19:58 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.6 required=5.0 tests=AWL,BAYES_00,KAM_LAZY_DOMAIN_SECURITY,RP_MATCHES_RCVD autolearn=no version=3.3.2 X-HELO: edge10.ethz.ch Received: from edge10.ethz.ch (HELO edge10.ethz.ch) (82.130.75.186) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-SHA encrypted) ESMTPS; Fri, 13 Nov 2015 11:19:57 +0000 Received: from CAS20.d.ethz.ch (172.31.51.110) by edge10.ethz.ch (82.130.75.186) with Microsoft SMTP Server (TLS) id 14.3.266.1; Fri, 13 Nov 2015 12:19:50 +0100 Received: from MBX13.d.ethz.ch ([fe80::c4aa:956e:5014:ce66]) by CAS20.d.ethz.ch ([fe80::2cd8:4907:7776:c56d%10]) with mapi id 14.03.0266.001; Fri, 13 Nov 2015 12:19:53 +0100 From: "VandeVondele Joost" To: "rguenther@suse.de" CC: "hiraditya@gmail.com" , "sebpop@gmail.com" , "gcc-patches@gcc.gnu.org" Subject: Re: [PATCH] RFC: Enable graphite at -O3 -fprofile_use Date: Fri, 13 Nov 2015 11:19:00 -0000 Message-ID: <908103EDB4893A42920B21D3568BFD9339F0AD26@MBX13.d.ethz.ch> Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-SW-Source: 2015-11/txt/msg01662.txt.bz2 I'm all in favour of requiring isl and enabling graphite by default, but wo= uld suggest to enable it with -Ofast instead.=20 One reason is that certainly extracting testcases from a PGO build is more = difficult, and initially there will certainly be miscompiles with graphite = (CP2K is right now).=20 Furthermore, unless graphite is particularly effective with PGO (does it us= e average loop trip counts already?), I don't see a particular connection. Joost