From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.devel Subject: Re: [PATCH] Re: Bignum performance Date: Tue, 15 Aug 2023 16:33:04 +0200 Message-ID: <87wmxwfk9r.fsf@dataswamp.org> References: <87bkfartof.fsf@localhost> <175cf474-29c8-a482-072e-0de784ac59e8@gmail.com> <87o7jaqc31.fsf@localhost> <2d419e12-9239-de3e-47d0-38815a00025f@gmail.com> <87msyth8jh.fsf@dataswamp.org> <871qg4n7n4.fsf@yahoo.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="27632"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:gAoxrzx49Sw9sqY7azbAi4apY08= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Tue Aug 15 16:54:34 2023 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 1qVvRJ-0006tM-GL for ged-emacs-devel@m.gmane-mx.org; Tue, 15 Aug 2023 16:54:33 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qVvPA-0006Ky-Nk; Tue, 15 Aug 2023 10:52:20 -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 1qVv8W-00073A-42 for emacs-devel@gnu.org; Tue, 15 Aug 2023 10:35:09 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qVv8R-000252-SX for emacs-devel@gnu.org; Tue, 15 Aug 2023 10:35:06 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1qVv8Q-0000k9-29 for emacs-devel@gnu.org; Tue, 15 Aug 2023 16:35:02 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: emacs-devel@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Tue, 15 Aug 2023 10:52:17 -0400 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:308760 Archived-At: Po Lu wrote: >> Are we talking 1 word = 2 bytes = 16 bits here, s2c? >> >> If so, the range of fixnums are -32 768 to 32 767 >> inclusive, so those are hardly huge numbers. > > Under Arm64, general purpose integer registers are 64 bits > wide. That is also the word size of said machine. If they are, the range for fixnums is (list (* -1 (expt 2 (1- 64))) (1- (expt 2 (1- 64))) ) (-9223372036854775808 9223372036854775807) Only after that it gets slower :P -- underground experts united https://dataswamp.org/~incal