From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 9A1D13858D39; Thu, 5 Jan 2023 14:07:02 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 9A1D13858D39 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1672927622; bh=VCkqyh3qi0nJMiMAQ66CyAYwGAH2PneaPWi1rQhFTmg=; h=From:To:Subject:Date:In-Reply-To:References:From; b=HetJQ6qUWa5ov7uiCUvzoMVxHxVqrliom/YT5pEWnAKpfYqKYownzPa6FGEzHxGot TXfd1qtOdL+DoZ7bWsHMT6MqJAwCPx5Qrsngi0jEQ7bzGBW8Dkyfv0HTvpOJMCxJgK Ps2N9sSe2m4L+cOkvfnKKNcJ1zvPQrQJki5IwaI8= From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/108292] [13 Regression] wrong code with vector compare & mask at -O1 and above Date: Thu, 05 Jan 2023 14:07:02 +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: 13.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 13.0 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108292 --- Comment #2 from Jakub Jelinek --- The assembly difference is - movl $1, x+20(%rip) + movl $-6, x+20(%rip) Now, that is the correct value to be stored into x[5] by the __builtin_sub_overflow (0, 6, &x[5]); statement, but each element is then shifted right by (element !=3D 0) ? 31 = : 0, so in this case -6U >> 31 aka 1.=