From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12888 invoked by alias); 30 Jun 2015 16:20:16 -0000 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 Received: (qmail 9742 invoked by uid 48); 30 Jun 2015 16:20:12 -0000 From: "segher at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/66706] Redundant bitmask instruction on x >> (n & 32) Date: Tue, 30 Jun 2015 16:20:00 -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-Version: 5.1.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: segher at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: segher at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_status cf_reconfirmed_on assigned_to everconfirmed Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-06/txt/msg03395.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66706 Segher Boessenkool changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2015-06-30 Assignee|unassigned at gcc dot gnu.org |segher at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #1 from Segher Boessenkool --- For some reason when combining the zero_extend with the lshiftrt, combine writes it as the equivalent and-of-subreg. Which doesn't match any existing backend pattern. Confirmed; mine.