From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 15B7D380D9BD; Mon, 7 Aug 2023 11:50:21 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 15B7D380D9BD DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1691409021; bh=jpkcI6A2agyV0PvTeht7ISyCS74WbuZCX6ehtIDA7y0=; h=From:To:Subject:Date:In-Reply-To:References:From; b=QCV4+CCSxGQZIBcejdgk6O6Df9ZJZyxeaTWJjwpGgIiI4wwnGGz/olvhLX7PEsO7d Teb925ik5u5OeC7jDxmsSWbDmd9+7BfP+rd1btC1gk3jlcOLsWCAyQBCxks5fmCC0S 8hr3f0UlGPqh7xAxe4M51sI+LHDfKx56ZHfOv6gg= From: "crazylht at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/110921] Relax _tzcnt_u32 support x86, all x86 arch support for this instrunction Date: Mon, 07 Aug 2023 11:50:20 +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: 14.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: crazylht 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110921 --- Comment #9 from Hongtao.liu --- > There is a redundant xor instrunction, There's false dependence issue on some specific processors. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D62011 > Without `-mbmi` option, gcc can not compile and all other three compiler > can compile. As long as it keeps semantics(respect zero input), I think this is acceptab= le.=