From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 9643 invoked by alias); 12 Apr 2012 06:20:17 -0000 Received: (qmail 9599 invoked by uid 22791); 12 Apr 2012 06:20:16 -0000 X-SWARE-Spam-Status: No, hits=-4.2 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,KHOP_THREADED,TW_QD 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, 12 Apr 2012 06:20:03 +0000 From: "olegendo at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/52898] SH Target: Inefficient DImode comparisons Date: Thu, 12 Apr 2012 06:20:00 -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: olegendo at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED 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: 2012-04/txt/msg00801.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52898 --- Comment #4 from Oleg Endo 2012-04-12 06:19:44 UTC --- (In reply to comment #3) > (In reply to comment #2) > I don't know about their history. -mcbranchdi is enabled by default, > though. See gcc/common/config/sh/sh-common.c:sh_option_optimization_table. Ah, I see. Now I'm even more confused than before :) If -mcbranchdi is enabled by default, I would not expect to see any changes in the generated code at all in some cases .... > Unfortunately, it looks -mcmpeqdi causes many new failures on trunk. I would propose to deprecate -mcbranchdi and -mcmpeqdi and hard-code the 'enabled' behavior, i.e. remove all the non-mcbranchdi and non-mcmpeqdi code paths in the back end code (and fixing the fails of course ...)