From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14529 invoked by alias); 18 Nov 2011 01:04:25 -0000 Received: (qmail 14519 invoked by uid 22791); 18 Nov 2011 01:04:24 -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; Fri, 18 Nov 2011 01:04:11 +0000 From: "hubicka at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/51134] [4.7 Regression] x86 memset/memcpy expansion is broken Date: Fri, 18 Nov 2011 01:17:00 -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: normal X-Bugzilla-Who: hubicka at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: hubicka at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.7.0 X-Bugzilla-Changed-Fields: Status Last reconfirmed Ever Confirmed 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: 2011-11/txt/msg01843.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51134 Jan Hubicka changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2011-11-18 Ever Confirmed|0 |1 --- Comment #7 from Jan Hubicka 2011-11-18 01:03:17 UTC --- I am testing patch fixing the Atom issues and other problems. The gfortran.fortran-torture/execute/arrayarg.f90 testcase is however different: the new inline code enables loop unrolling that in turn makes sched2 to produce wrong code. The testcase passes with -fno-unroll-loop (or a hack disabling only RTL unroller) as well as with -fno-schedule-insns2 added. After hours looking into the code produced I am quite convinced that the memset expansion involved is correct. Can someone with better Fortran-fu than me verify that the testcase is well defined WRT aliasing? Honza