From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 14138 invoked by alias); 7 Jul 2010 17:28:04 -0000 Received: (qmail 13797 invoked by uid 48); 7 Jul 2010 17:27:43 -0000 Date: Wed, 07 Jul 2010 17:28:00 -0000 Message-ID: <20100707172743.13796.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug debug/44832] [4.6 Regression] -fcompare-debug failure for C++ i386.c In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "amylaar at gcc dot gnu dot org" 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: 2010-07/txt/msg00767.txt.bz2 ------- Comment #30 from amylaar at gcc dot gnu dot org 2010-07-07 17:27 ------- (In reply to comment #28) > No, the culprit is loop header copying which causes I also see changes in the MEM_* after loop header copying. It happens during the second call of copy_loop_header. Alas, it seems that copy_loop_header is innocent, because it gets different freed ssa name versions for debug / no debug compilation: Debug: Breakpoint 5, copy_loop_headers () at ../../gcc/gcc/tree-ssa-loop-ch.c:140 140 loop_optimizer_init (LOOPS_HAVE_PREHEADERS (gdb) call debug_tree(cfun->gimple_df->free_ssanames) def_stmt version 87 in-free-list> (gdb) call debug_tree(cfun->gimple_df->free_ssanames->common.chain) def_stmt version 83 in-free-list> No debug: Breakpoint 5, copy_loop_headers () at ../../gcc/gcc/tree-ssa-loop-ch.c:140 140 loop_optimizer_init (LOOPS_HAVE_PREHEADERS (gdb) call debug_tree(cfun->gimple_df->free_ssanames) def_stmt version 87 in-free-list> (gdb) call debug_tree(cfun->gimple_df->free_ssanames->common.chain) def_stmt version 82 in-free-list> -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44832