From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ABCEBC4363D for ; Fri, 2 Oct 2020 20:19:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5BA92206FA for ; Fri, 2 Oct 2020 20:19:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725769AbgJBUT1 (ORCPT ); Fri, 2 Oct 2020 16:19:27 -0400 Received: from zimbra.cs.ucla.edu ([131.179.128.68]:34560 "EHLO zimbra.cs.ucla.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725763AbgJBUT0 (ORCPT ); Fri, 2 Oct 2020 16:19:26 -0400 Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 63F981600DA; Fri, 2 Oct 2020 13:19:26 -0700 (PDT) Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id Tc9jUrd4rOYw; Fri, 2 Oct 2020 13:19:25 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 7BD381600DB; Fri, 2 Oct 2020 13:19:25 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id Ri1b8mfqEcJH; Fri, 2 Oct 2020 13:19:25 -0700 (PDT) Received: from [192.168.1.9] (cpe-23-243-218-95.socal.res.rr.com [23.243.218.95]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 4420F1600D1; Fri, 2 Oct 2020 13:19:25 -0700 (PDT) Subject: Re: [PATCH 1/4] system_data_types.7: Add '__int128' To: Alejandro Colomar Cc: Florian Weimer , Alejandro Colomar via Libc-alpha , linux-man@vger.kernel.org, gcc-patches@gcc.gnu.org, mtk.manpages@gmail.com References: <20201001163443.106933-1-colomar.6.4.3@gmail.com> <20201001163443.106933-2-colomar.6.4.3@gmail.com> <87eemg97ew.fsf@oldenburg2.str.redhat.com> From: Paul Eggert Autocrypt: addr=eggert@cs.ucla.edu; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org On 10/2/20 1:03 PM, Alejandro Colomar wrote: > I know it's not in stdint, > but I mean that it behaves as any other stdint type. It doesn't. There's no portable way to use scanf and printf on it. You can't reliably convert it to intmax_t. It doesn't have the associated _MIN and _MAX macros that the stdint types do. It's a completely different animal. If all you need are a few bit-twiddling tricks on x86-64, it should work. But watch out if you try to do something fancy, like multiply or divide or read or print or atomics. There's a good reason it's excluded from intmax_t.