From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 100226 invoked by alias); 11 Nov 2015 12:43:24 -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 100168 invoked by uid 89); 11 Nov 2015 12:43:23 -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,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; Wed, 11 Nov 2015 12:43:22 +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 6EE64A35A2; Wed, 11 Nov 2015 12:43:21 +0000 (UTC) Received: from localhost.localdomain (vpn1-7-11.ams2.redhat.com [10.36.7.11]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id tABChJkq026439; Wed, 11 Nov 2015 07:43:20 -0500 Subject: Re: Enable pointer TBAA for LTO To: Richard Biener , Jan Hubicka References: <20151108204618.GA68715@kam.mff.cuni.cz> <20151110181515.GB78110@kam.mff.cuni.cz> Cc: gcc-patches@gcc.gnu.org From: Bernd Schmidt Message-ID: <564337E7.2070802@redhat.com> Date: Wed, 11 Nov 2015 12:43:00 -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: 2015-11/txt/msg01361.txt.bz2 On 11/11/2015 10:21 AM, Richard Biener wrote: > On Tue, 10 Nov 2015, Jan Hubicka wrote: >> The reason is that TYPE_CANONICAL is initialized in get_alias_set that may be >> called before we finish all merging and then it is more fine grained than what >> we need here (i.e. TYPE_CANONICAL of pointers to two differnt types will be >> different, but here we want them to be equal so we can match: >> >> struct aa { void *ptr;}; >> struct bb { int * ptr;}; >> >> Which is actually required for Fortran interoperability. Just curious, is this sort of thing documented anywhere? Bernd