From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 47E33387084F; Fri, 29 May 2020 21:31:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 47E33387084F DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1590787862; bh=aYOMKWn23JZmOmeHpu7+bx5RFwcNhUyvQbf1/z/dBN8=; h=From:To:Subject:Date:In-Reply-To:References:From; b=SpFe/vVMyPJKnMaMaHqhir/GlW3XiR+GtZM6+F6b5zuXWPLR8hdjochUuNnsRKQ5c XR6hjnTYZOfsr2x6ywUWGTH8q/07Zo4yLQ7vPj8tsbZi2nnO1a2Hp7TlqnJDamoHVE 2K4NyaLypQ80nf3VJSuX0j7nA3RKrxoHfXmZgKX4= From: "glisse at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/95423] Failure to optimize separated multiplications by x and square of x Date: Fri, 29 May 2020 21:31:02 +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: 11.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: glisse 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: --- 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, 29 May 2020 21:31:02 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95423 --- Comment #3 from Marc Glisse --- We manage it with -fwrapv. This should happen late when we don't care about overflow anymore, or it needs to introduce casts to an unsigned type.=