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: Mon, 04 Sep 2023 06:13:39 +0200 Message-ID: <871qfer2x8.fsf@dataswamp.org> References: <874jkzllqq.fsf@yahoo.com> <2dec78a7-76e0-8789-4d20-7f0f6effe28a@gmail.com> <87pm3neei7.fsf@dataswamp.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="38077"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:Ar1URVw1QyAtSk7vBdVbSSB6lSU= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Sep 04 12:48:09 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 1qd77o-0009c4-T5 for ged-emacs-devel@m.gmane-mx.org; Mon, 04 Sep 2023 12:48:08 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qd774-0001KE-OZ; Mon, 04 Sep 2023 06:47:22 -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 1qd0yH-0002Tp-Ei for emacs-devel@gnu.org; Mon, 04 Sep 2023 00:13:53 -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 1qd0yF-0000uU-0G for emacs-devel@gnu.org; Mon, 04 Sep 2023 00:13:53 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1qd0yB-0000V4-Tb for emacs-devel@gnu.org; Mon, 04 Sep 2023 06:13:47 +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: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Mon, 04 Sep 2023 06:47:20 -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:310061 Archived-At: Simon Leinen wrote: > Emacs also has `most-negative-fixnum' and > `most-positive-fixnum' (borrowed from Common Lisp but now > part of the core). > > On my 64-bit system (GNU Emacs 30.0.50 on aarch64-apple-darwin22.5.0): > > (= (- (expt 2 61)) most-negative-fixnum) → t > (= (1- (expt 2 61)) most-positive-fixnum) → t > > (Same as on Emanuel's.) (let ((bits 62)) (and (= (- (expt 2 (1- bits))) most-negative-fixnum) (= (1- (expt 2 (1- bits))) most-positive-fixnum) )) ; t Sweet B) -- underground experts united https://dataswamp.org/~incal