From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 24218 invoked by alias); 31 Mar 2011 01:05:45 -0000 Received: (qmail 24207 invoked by uid 22791); 31 Mar 2011 01:05:45 -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; Thu, 31 Mar 2011 01:05:41 +0000 From: "vmakarov at redhat dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/48367] [4.7 Regression] 200.sixtrack/301.apsi in SPEC CPU 2000 are miscompiled X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: vmakarov at redhat dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 4.7.0 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 Date: Thu, 31 Mar 2011 03:27:00 -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: 2011-03/txt/msg03287.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48367 --- Comment #6 from Vladimir Makarov 2011-03-31 01:05:33 UTC --- The problem was in a typo in ira-costs.c which in some cases results in assigning INT_MAX to memory_cost and as consequence ALL_REGS to some allocnos. After some optimizations the allocno which got a hard reg and corresponds to loop which contains subloops and never referenced in its loop is spilled in function move_spill_restore and because it is never referenced in the loop, it got zero costs for all hard regs. In reload, the allocno is assigned to a mmx hard register through IRA which corrupted by sse registers usage in other program places. I'll sent a patch soon to fix this.