From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 9568C3857347; Sun, 12 Jun 2022 16:18:03 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9568C3857347 From: "torvalds@linux-foundation.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/105930] [12/13 Regression] Excessive stack spill generation on 32-bit x86 Date: Sun, 12 Jun 2022 16:18:03 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 12.1.1 X-Bugzilla-Keywords: missed-optimization, needs-bisection X-Bugzilla-Severity: normal X-Bugzilla-Who: torvalds@linux-foundation.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 12.2 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: Sun, 12 Jun 2022 16:18:03 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105930 --- Comment #8 from Linus Torvalds --- (In reply to Roger Sayle from comment #7) > Investigating. Adding -mno-stv the stack size reduces from 2612 to 428 (= and > on godbolt the number of assembler lines reduces from 6952 to 6203). Thanks. Using -mno-stv may well be a good workaround for the kernel for now, except I don't have a clue what it means. I will google it to figure out whether it's appropriate for our use.=