From owner-freebsd-hackers@freebsd.org Sun May 1 20:51:31 2016 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 248E2B29E2A for ; Sun, 1 May 2016 20:51:31 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Received: from mail-wm0-x236.google.com (mail-wm0-x236.google.com [IPv6:2a00:1450:400c:c09::236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id B2D0F1707 for ; Sun, 1 May 2016 20:51:30 +0000 (UTC) (envelope-from rozhuk.im@gmail.com) Received: by mail-wm0-x236.google.com with SMTP id a17so115157226wme.0 for ; Sun, 01 May 2016 13:51:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:date:to:subject:message-id:mime-version :content-transfer-encoding; bh=ERIg4HHuIsrdX9llKPCiZuj7h2taw5KiOFQQzcP69Mo=; b=MlMiD46KlJoFKAKgeRW8VfLOrN3Aehhr1uD5XSUSjZVA1wsQgNZ6E4TNLHb2y5WP9j I7dPjXuJfp42Qme55K17sJaGtP7Eqc+WemdL091k9eJjPbWoRmVirbeiBLunIU9dra+E WwHeDp2D8uM/m9sCeuPHMfnp28Ax+ET6Csq01INQLA0PX3firR5xFTtGHQWJaClnQlKn 8VSieUxAJ9TxpLPY8qbTM/gsf3kJfNOt2Qi/iVN9swJITU6cqJEHFJfWf2sB2ABBLOml takfpFroaV6ilLH3juKIXv7gyTunuLyqI0CnAR1PG8AidOfOnKVOCq7ViuIEu4Cdn1qb i0EA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:date:to:subject:message-id:mime-version :content-transfer-encoding; bh=ERIg4HHuIsrdX9llKPCiZuj7h2taw5KiOFQQzcP69Mo=; b=X3hda5Gj8RRgilAd8+VYwqtg81oT0aviKkMI4IF+aCfMcDWa64mnRzuEBCUWQ3Nt3T nDAo5ihhnV5LwSVZFUcY4FrMRDq7VJDQNa+LT+qb2Jb30ariHtQq2pgHFYErQRrIgUZF nh5WOPimy6p57Wz++oIYUPNhQ49upwGlekDi0ByihFa/H45ql3rHRBU0e9yi0cNP5u8P vcKK9CN/J0xCBsByffhUiVr/UWXHjGypAf9oT3bykKZmVC/b2zEXYs6vM3LHwagRlGsH ydDP1ZJuOACiAzqvRUgOOYeEA/siQf2waIQ9dnwEKCfFOEN8X2XMH4CSAW+BK6roTpPX U15g== X-Gm-Message-State: AOPr4FVqV/wR1Z8xY3d/MyFS5jR0SiAf1VhEvcmGXslbxYSlkb2MSN/dqdGC6qLBtoydsQ== X-Received: by 10.28.227.138 with SMTP id a132mr14791108wmh.35.1462135889279; Sun, 01 May 2016 13:51:29 -0700 (PDT) Received: from rimwks ([2001:470:1f15:8e:4056:a363:84fd:84d8]) by smtp.gmail.com with ESMTPSA id jd4sm26166159wjb.43.2016.05.01.13.51.28 (version=TLSv1/SSLv3 cipher=OTHER); Sun, 01 May 2016 13:51:28 -0700 (PDT) From: Rozhuk Ivan X-Google-Original-From: Rozhuk Ivan Date: Sun, 1 May 2016 23:51:27 +0300 To: , Rozhuk Ivan Subject: some clang AVX instricts looks broken Message-ID: <20160501235127.451d8812@rimwks> X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.29; amd64-portbld-freebsd10.3) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 01 May 2016 20:51:31 -0000 Hi! I try port some SSE code to AVX and found that clang instricts _mm256_extract* broken: _mm256_extract_epi8(__aymm0, 0) - BAD result _mm256_extract_epi8(__aymm0, 0) & 0xff - OK _mm_extract_epi8(_mm256_extractf128_si256(__aymm0, 0), 0) - OK Same time: _mm256_extract_epi8(__aymm0, 0) build with GCC - OK. CLANG: static __inline int __attribute__((__always_inline__, __nodebug__)) _mm256_extract_epi8(__m256i __a, int const __imm) { __v32qi __b = (__v32qi)__a; return __b[__imm & 31]; } GCC: extern __inline int __attribute__((__gnu_inline__, __always_inline__, __artificial__)) _mm256_extract_epi8 (__m256i const __X, int const __N) { __m128i __Y = _mm256_extractf128_si256 (__X, __N >> 4); return _mm_extract_epi8 (__Y, __N % 16); }