From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2047 invoked by alias); 2 Aug 2011 14:41:28 -0000 Received: (qmail 1989 invoked by uid 22791); 2 Aug 2011 14:41:27 -0000 X-SWARE-Spam-Status: No, hits=-2.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 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; Tue, 02 Aug 2011 14:41:13 +0000 From: "izamyatin at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/49946] New: Thread jumps confuse loop unrolling X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: izamyatin at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Tue, 02 Aug 2011 14:41:00 -0000 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: 2011-08/txt/msg00206.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49946 Summary: Thread jumps confuse loop unrolling Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end AssignedTo: unassigned@gcc.gnu.org ReportedBy: izamyatin@gmail.com Created attachment 24892 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24892 test for loop unrolling I see exactly the case that was mentioned here - http://gcc.gnu.org/ml/gcc/2010-01/msg00057.html: exp_gcc/gcc -c -O3 test_unroll.c -fno-tree-dominator-opts performs complete unroll and exp_gcc/gcc -c -O3 test_unroll.c does not do the unroll