From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 27858 invoked by alias); 31 Aug 2012 00:39:31 -0000 Received: (qmail 27845 invoked by uid 22791); 31 Aug 2012 00:39:30 -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; Fri, 31 Aug 2012 00:39:18 +0000 From: "chaoyingfu at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/54369] Delayed-branch pass in reorg.c removes too many instructions Date: Fri, 31 Aug 2012 00:39:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: rtl-optimization X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: chaoyingfu at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- 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: 2012-08/txt/msg02028.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54369 --- Comment #3 from chaoyingfu at gcc dot gnu.org 2012-08-31 00:38:39 UTC --- The fall-through path of this jump has a barrier (resulted from __builtin_unreachable), and the target of this jump has a return instruction. The algorithm in reorg.c may be more conservative to keep this jump for code correctness. Just another solution to this issue. Thanks!