From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 9773139F081A; Fri, 5 Feb 2021 11:54:27 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9773139F081A From: "rguenth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/98973] [11 regression] Wrong code with gcse store motion pass Date: Fri, 05 Feb 2021 11:54:27 +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: 11.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: rguenth at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 11.0 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Feb 2021 11:54:27 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98973 --- Comment #6 from Richard Biener --- Btw, -fgcse-sm is nowhere enabled by default (same applies to -fgcse-las), = we should consider removing these optimizations (though -fgcse-las at least so= unds useful and I wonder why it is not enabled). GCSE store-motion should be re-implemented on GIMPLE, replacing the sink pass (there were previous attempts in implementing SSU-PRE). A comment in store-motion.c claims /* This pass implements downward store motion. As of May 1, 2009, the pass is not enabled by default on any target, but bootstrap completes on ia64 and x86_64 with the pass enabled. */ I'm trying if enabling it by default still bootstraps & tests OK on x86-64 (also enabling gcse-las at the same time..)=