From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 22452 invoked by alias); 5 Apr 2012 08:13:14 -0000 Received: (qmail 22443 invoked by uid 22791); 5 Apr 2012 08:13:11 -0000 X-SWARE-Spam-Status: No, hits=-4.2 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,KHOP_THREADED,TW_CP X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 05 Apr 2012 08:12:57 +0000 From: "mhlavink at redhat dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/52415] memcpy to local variable generates unnecessary stack frame for armv7 Date: Thu, 05 Apr 2012 08:13:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Keywords: X-Bugzilla-Severity: enhancement X-Bugzilla-Who: mhlavink at redhat dot com X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2012-04/txt/msg00330.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52415 --- Comment #6 from Michal Hlavinka 2012-04-05 08:12:54 UTC --- We can see this bug on avr target too. Following code does not work: DirEnt tmp = eeFs.files[i_fileId1]; eeFs.files[i_fileId1] = eeFs.files[i_fileId2]; eeFs.files[i_fileId2] = tmp; workaround from comment #4 helps DirEnt tmp; __builtin_memcpy(&tmp, __builtin_assume_aligned(&eeFs.files[i_fileId1], sizeof(DirEnt)), sizeof(DirEnt)); ... ... So it seems it's the same bug