From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 19423 invoked by alias); 2 May 2012 07:24:17 -0000 Received: (qmail 19408 invoked by uid 22791); 2 May 2012 07:24:15 -0000 X-SWARE-Spam-Status: No, hits=-4.3 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,KHOP_THREADED 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; Wed, 02 May 2012 07:24:02 +0000 From: "davem at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/52684] [4.7 regression] glibc long double math tests fail on sparc 64-bit Date: Wed, 02 May 2012 07:24:00 -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: davem at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: davem at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.7.1 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: 2012-05/txt/msg00063.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52684 --- Comment #8 from davem at gcc dot gnu.org 2012-05-02 07:23:56 UTC --- I can't see how the current DSE code can properly handle this case, and I'm surprised this doesn't trigger more often. The outgoing args are stored to offsets of FRAME_POINTER_REGNUM, even though this is before reload. This causes DSE to set ->frame_related However I can't see anything that takes into account that these locations in the frame are read by the CALL_INSN. There is some weird commentary in the description of the insn_info->frame_read field in dse.c which talks about how "the stores related to outgoing arguments are stack pointer based and thus deemed of non-constant base in this pass" but as explained above that is simply not true here.