From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 9910 invoked by alias); 7 May 2015 13:29:35 -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 9896 invoked by uid 89); 7 May 2015 13:29:34 -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,SPF_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; Thu, 07 May 2015 13:29:34 +0000 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id t47DTVwj019304 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 7 May 2015 09:29:32 -0400 Received: from localhost.localdomain (ovpn-113-143.phx2.redhat.com [10.3.113.143]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t47DTTEN016140; Thu, 7 May 2015 09:29:30 -0400 Message-ID: <554B68B9.7010504@redhat.com> Date: Thu, 07 May 2015 13:29:00 -0000 From: Jeff Law User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 MIME-Version: 1.0 To: Marek Polacek , Segher Boessenkool CC: gcc-patches@gcc.gnu.org Subject: Re: [PATCH] Make mergeable read-only sections per-function, if requested. References: <8f67f9aad3d5b98cb428dea0316a86615b89adb9.1430937961.git.segher@kernel.crashing.org> <20150507081507.GA3384@redhat.com> In-Reply-To: <20150507081507.GA3384@redhat.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2015-05/txt/msg00546.txt.bz2 On 05/07/2015 02:15 AM, Marek Polacek wrote: > On Wed, May 06, 2015 at 03:59:33PM -0700, Segher Boessenkool wrote: >> Currently GCC does not put mergeable read-only data in a per-function >> section, so the -gc-sections linker option does not do much for such >> data. Fix that. > > Dunno if it is a good idea, but... Why not? In a static build it gives the linker a chance to remove unreferenced data or to reorder the data to be more tlb or dcache friendly. That's the whole purpose behind -f{function,data}-sections. Jeff