From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 301983858C50; Mon, 29 Aug 2022 07:42:26 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 301983858C50 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1661758946; bh=+uBn6suRTN9v2vu4p1Qwgz17QyrjCBeqFWLpQphPSw4=; h=From:To:Subject:Date:In-Reply-To:References:From; b=J52HahSanAC6AsH51t5vZcpVbDXFELCPGjVNHLESCI1xe1jcS9XNyxFj6tFg9Kbk+ eqMoT9P2wtlTjlFZ/b0SoXJrpVZT6ZfBouYXVTyVujgHKxEL+m/3z7byi2rcbHnilh TXNkOwAy8vI8TurINtye3fqpGJJHj7dnd3gW6DDE= From: "rdapp at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug middle-end/91213] Missed optimization: (sub X Y) -> (xor X Y) when Y <= X and isPowerOf2(X + 1) Date: Mon, 29 Aug 2022 07:42:25 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: middle-end X-Bugzilla-Version: 10.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: enhancement X-Bugzilla-Who: rdapp at gcc dot gnu.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: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91213 rdapp at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rdapp at gcc dot gnu.org --- Comment #6 from rdapp at gcc dot gnu.org --- What's the mechanism to get range information at RTL level? The only related thing I saw in (e.g.) simplify-rtx.cc is nonzero_bits and this does not see= m to be propagated from gimple.=