From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: master 8c81818673a 6/7: Tune volatile in read_char Date: Sat, 17 Aug 2024 11:17:40 -0700 Organization: UCLA Computer Science Department Message-ID: References: <172386820621.30556.15409337288904485218@vcs2.savannah.gnu.org> <20240817041648.A6687C2BC66@vcs2.savannah.gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="29580"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla Thunderbird To: Andrea Corallo , emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Aug 17 20:18:01 2024 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1sfNzz-0007Yj-Qk for ged-emacs-devel@m.gmane-mx.org; Sat, 17 Aug 2024 20:18:00 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sfNzk-00077O-Aa; Sat, 17 Aug 2024 14:17:44 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sfNzj-00077D-B7 for emacs-devel@gnu.org; Sat, 17 Aug 2024 14:17:43 -0400 Original-Received: from mail.cs.ucla.edu ([131.179.128.66]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sfNzh-0007SO-TQ; Sat, 17 Aug 2024 14:17:43 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id A0E763C011BD7; Sat, 17 Aug 2024 11:17:40 -0700 (PDT) Original-Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10032) with ESMTP id VIPZEdZxzCMT; Sat, 17 Aug 2024 11:17:40 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by mail.cs.ucla.edu (Postfix) with ESMTP id 5E5153C011BD8; Sat, 17 Aug 2024 11:17:40 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.10.3 mail.cs.ucla.edu 5E5153C011BD8 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cs.ucla.edu; s=9D0B346E-2AEB-11ED-9476-E14B719DCE6C; t=1723918660; bh=5oJNCLClhWDGoUxvpVZhiOYzM+Fnc8qBn8eYg9sEquk=; h=Message-ID:Date:MIME-Version:To:From; b=YIv9HpTkzF8XzPVgtHEbvGHCAHU+JAdW148NA2cnpyhi2BY3yBe7cGXG6fU1Lv0TX 12zGoB7TLRKuvtmuGdEXrWa5RTEwdLwAGnCXHcsT8SuVWQxhKkraMcDolRsuFLqphP 05HZzHtJOg4+4A1t8vUvWdRdy6XP+6uh9VzmzrgysMjxXvptdFjNKTacBEzcy2HoJQ 0q+NFPotlW/J4pPx0LTR+8/R7BAoW0xqiC7csZB+NpIrgJQDv1Dnfl2dEYtkbu6T5s ao0JNvZKZB5zAj0BpH49aOzLNCQz4axa0oOIclr/yOjMXc+ielASHOHRvKBACyyufp wKng4YHujtbVw== X-Virus-Scanned: amavis at mail.cs.ucla.edu Original-Received: from mail.cs.ucla.edu ([127.0.0.1]) by localhost (mail.cs.ucla.edu [127.0.0.1]) (amavis, port 10026) with ESMTP id hXiVu6U_TZ5g; Sat, 17 Aug 2024 11:17:40 -0700 (PDT) Original-Received: from [192.168.254.12] (unknown [47.150.137.250]) by mail.cs.ucla.edu (Postfix) with ESMTPSA id 42AF53C011BD7; Sat, 17 Aug 2024 11:17:40 -0700 (PDT) Content-Language: en-US In-Reply-To: Received-SPF: pass client-ip=131.179.128.66; envelope-from=eggert@cs.ucla.edu; helo=mail.cs.ucla.edu X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:322871 Archived-At: On 2024-08-17 08:04, Andrea Corallo wrote: > Also wanted to ask, is this a performance optimization? Yes, the idea is to keep the recently-read c in a register rather than always referring to RAM. Admittedly a minor optimization these days.