From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id CE6213857C40; Wed, 2 Jun 2021 23:18:12 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CE6213857C40 From: "nok.raven at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/100858] Simple common code hoisting is not performed Date: Wed, 02 Jun 2021 23:18:12 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: nok.raven at gmail dot com 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: --- 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: Wed, 02 Jun 2021 23:18:12 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100858 --- Comment #2 from Nikita Kniazev --- (In reply to Richard Biener from comment #1) > That's really a duplicate of 100858 - this case can be handled by sinking= as > well > since we "sink" the return. Make it >=20 > void bar(); >=20 > int foo(bool f) > { > if (f) { > bar(); > __builtin_abort (); > } > else { > bar(); > return 2; > } > } > to force hoisting. I have a hard time in finding this as equivalent to the original code. > Hoisting is done by PRE but that requires a LHS and doesn't handle calls = with side-effects. That seems like an artificial limitation. Why we cannot hoist the bar call?=