From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dedi548.your-server.de (dedi548.your-server.de [85.10.215.148]) by sourceware.org (Postfix) with ESMTPS id 51DE7385841B for ; Fri, 4 Nov 2022 10:02:39 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 51DE7385841B Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=embedded-brains.de Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=embedded-brains.de Received: from sslproxy03.your-server.de ([88.198.220.132]) by dedi548.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1oqtX2-000JVS-Qe; Fri, 04 Nov 2022 11:02:36 +0100 Received: from [82.100.198.138] (helo=mail.embedded-brains.de) by sslproxy03.your-server.de with esmtpsa (TLSv1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1oqtX2-000MZk-D3; Fri, 04 Nov 2022 11:02:36 +0100 Received: from localhost (localhost [127.0.0.1]) by mail.embedded-brains.de (Postfix) with ESMTP id 19635480207; Fri, 4 Nov 2022 11:02:36 +0100 (CET) Received: from mail.embedded-brains.de ([127.0.0.1]) by localhost (zimbra.eb.localhost [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id 4d5th73aZ8my; Fri, 4 Nov 2022 11:02:35 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by mail.embedded-brains.de (Postfix) with ESMTP id D133248020E; Fri, 4 Nov 2022 11:02:35 +0100 (CET) X-Virus-Scanned: amavisd-new at zimbra.eb.localhost Received: from mail.embedded-brains.de ([127.0.0.1]) by localhost (zimbra.eb.localhost [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id ZhDGAwFpaU5G; Fri, 4 Nov 2022 11:02:35 +0100 (CET) Received: from [10.10.171.6] (unknown [10.10.171.6]) by mail.embedded-brains.de (Postfix) with ESMTPSA id 853A2480207; Fri, 4 Nov 2022 11:02:35 +0100 (CET) Message-ID: <81a7e57d-3b19-fdb0-df9f-7228dd9f821e@embedded-brains.de> Date: Fri, 4 Nov 2022 11:02:34 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.2 Subject: Re: -fprofile-update=atomic vs. 32-bit architectures Content-Language: en-US To: Gabriel Paubert Cc: GCC Development References: <13ec35ee-19b2-536c-42d9-28efcd01df5b@embedded-brains.de> From: Sebastian Huber In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Authenticated-Sender: smtp-embedded@poldinet.de X-Virus-Scanned: Clear (ClamAV 0.103.7/26710/Fri Nov 4 08:53:05 2022) X-Spam-Status: No, score=-5.3 required=5.0 tests=BAYES_00,KAM_DMARC_STATUS,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 04/11/2022 10:53, Gabriel Paubert wrote: >> 2. Use >> >> if (__atomic_add_fetch_4 ((unsigned int *) &val, 1, __ATOMIC_RELAXE= D) =3D=3D >> 0) >> __atomic_fetch_add_4 (((unsigned int *) &val) + 1, 1, __ATOMIC_RE= LAXED); >> >> if 32-bit atomics are available. > This assumes little-endian byte order. Yes, but this approach would also work on big-endian architectures. You=20 just have to use other addresses. I guess the compiler knows for which=20 endianess it generates code. --=20 embedded brains GmbH Herr Sebastian HUBER Dornierstr. 4 82178 Puchheim Germany email: sebastian.huber@embedded-brains.de phone: +49-89-18 94 741 - 16 fax: +49-89-18 94 741 - 08 Registergericht: Amtsgericht M=C3=BCnchen Registernummer: HRB 157899 Vertretungsberechtigte Gesch=C3=A4ftsf=C3=BChrer: Peter Rasmussen, Thomas= D=C3=B6rfler Unsere Datenschutzerkl=C3=A4rung finden Sie hier: https://embedded-brains.de/datenschutzerklaerung/