From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 24732 invoked by alias); 6 Aug 2010 10:27:30 -0000 Received: (qmail 24682 invoked by alias); 6 Aug 2010 10:27:16 -0000 Date: Fri, 06 Aug 2010 10:27:00 -0000 Message-ID: <20100806102716.24681.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug bootstrap/44970] [4.6 regression] Revision 162270 failed to bootstrap In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "bernds at codesourcery dot com" 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: 2010-08/txt/msg00406.txt.bz2 ------- Comment #73 from bernds at codesourcery dot com 2010-08-06 10:27 ------- Subject: Re: [4.6 regression] Revision 162270 failed to bootstrap On 08/06/2010 12:00 PM, bonzini at gnu dot org wrote: > ------- Comment #72 from bonzini at gnu dot org 2010-08-06 10:00 ------- > No, why is there no def for r25 _where it is clobbered_? There is. The problem seems to be that we first propagate into insn 15, which then looks like (insn 15 14 16 3 (set (reg:DI 67 [ obj.8+-4 ]) (sign_extend:DI (reg:SI 25 %r25 [ obj ]))) ../../gcc/gcc/cfg.c:1211 139 {extendsidi2} (expr_list:REG_DEAD (reg/v:DI 74 [ obj+-4 ]) (nil))) and from there, we propagate into another insn. However, at this point, insn 15 has no uses associated with it, so all_uses_available_at returns true without doing anything. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44970