From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by sourceware.org (Postfix) with ESMTP id BDD9A397283E for ; Wed, 20 Jan 2021 16:25:48 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org BDD9A397283E Received: from mail-qt1-f199.google.com (mail-qt1-f199.google.com [209.85.160.199]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-441-g0z2n6aPNm-617iVDb50gw-1; Wed, 20 Jan 2021 11:25:46 -0500 X-MC-Unique: g0z2n6aPNm-617iVDb50gw-1 Received: by mail-qt1-f199.google.com with SMTP id d1so9620322qtp.11 for ; Wed, 20 Jan 2021 08:25:46 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:organization :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=3AH2KXPwahTSIpE0nbrdO14qhdHameZhvydD5ACBWGo=; b=T3EaetN+aUeaN1A3M9gpwSp7WIxHHHXEVCzV9otl6RaHTj3JtBw2fd0WSD4Q5kAFyM ZDpbcNWIAR83YNa+9xzAImjVe1VHQhN0TV0Uv9g3L0aFRrMo0GMZG9hjZWaz3Jz1PvXz FBAE0At/6XCykSOXjYptbSU/JUJvnDVpmq55NXhZ/0hedCjSTkaVE+AzvPYxG+pEuboM 7u95eKpEwQ9Ujq22kprCC1OUTyU3HWlZYBiLV1FS66rf6HR9QmgynYKdrhgqOQBPco6k BwpFEClPaa8Md6Lx+mxEiAOwUQVxjigKov1zRVVETzVlZiKjqX94EHUksXsCK4z+10OF 8nTw== X-Gm-Message-State: AOAM530OcTIVSwN37RAW2+ODASsQJ/OLpmctEIXQwDupNVF7hL4Q0GbW maY2mJH4QxYaSHjZZempcRSC2ukweEQqm83T4lURUvMW6sLjjGdCf+IGXx1wHunQZkwfPEpldUd +uHtwvkZC/iKLNipWkLpKwEhb1uPHSlVn1CFq4Vnk3iS+0snNvaQeIqbUdhbvTvOu/9yN X-Received: by 2002:a37:a06:: with SMTP id 6mr9851593qkk.376.1611159946097; Wed, 20 Jan 2021 08:25:46 -0800 (PST) X-Google-Smtp-Source: ABdhPJxKAflX2s1ly393lRF5DJoNtJ1fvfZ9MsYbA0agtMt7upbH6U0oseYQ3esrdxRARYJLeRTW6w== X-Received: by 2002:a37:a06:: with SMTP id 6mr9851581qkk.376.1611159945895; Wed, 20 Jan 2021 08:25:45 -0800 (PST) Received: from [192.168.1.16] (198-84-214-74.cpe.teksavvy.com. [198.84.214.74]) by smtp.gmail.com with ESMTPSA id 9sm1643803qke.123.2021.01.20.08.25.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 20 Jan 2021 08:25:45 -0800 (PST) Subject: Re: Lightning talk notes on glibc To: Fangrui Song , libc-help@sourceware.org References: <20210120074815.k6km6cmhrt4aknpo@gmail.com> From: Carlos O'Donell Organization: Red Hat Message-ID: Date: Wed, 20 Jan 2021 11:25:44 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <20210120074815.k6km6cmhrt4aknpo@gmail.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-5.6 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-help@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-help mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 16:25:49 -0000 On 1/20/21 2:48 AM, Fangrui Song wrote: > Another workaround is `#pragma GCC optimize ("O0")`. I use '__attribute__ ((optimize("-O0")))' on a per-function basis to debug more deeply only specific functions and avoid possible consequences of the resulting changes. -- Cheers, Carlos.