From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 29568 invoked by alias); 5 Oct 2012 23:40:14 -0000 Received: (qmail 29434 invoked by uid 48); 5 Oct 2012 23:39:57 -0000 From: "pinskia at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/54829] bad optimization: sub followed by cmp w/ zero (x86 & ARM) Date: Fri, 05 Oct 2012 23:40:00 -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: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: pinskia 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: Keywords Status Last reconfirmed Ever Confirmed Severity 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: 2012-10/txt/msg00493.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54829 Andrew Pinski changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |missed-optimization Status|UNCONFIRMED |NEW Last reconfirmed| |2012-10-05 Ever Confirmed|0 |1 Severity|normal |enhancement --- Comment #1 from Andrew Pinski 2012-10-05 23:39:56 UTC --- Confirmed: Trying 7 -> 8: Failed to match this instruction: (set (reg:CC 17 flags) (compare:CC (minus:DI (reg/v:DI 60 [ a ]) (reg/v:DI 61 [ b ])) (const_int 0 [0])))