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: Wed, 16 Aug 2023 07:35:12 +0200 Message-ID: <87pm3neei7.fsf@dataswamp.org> References: <874jkzllqq.fsf@yahoo.com> <2dec78a7-76e0-8789-4d20-7f0f6effe28a@gmail.com> 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="11486"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:LIDrUt2VekB5pfCDyzfgeQtix6c= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Aug 16 13:12:26 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 1qWERt-0002lH-9O for ged-emacs-devel@m.gmane-mx.org; Wed, 16 Aug 2023 13:12:25 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qWER0-0004Ez-88; Wed, 16 Aug 2023 07:11:30 -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 1qW9Bl-0004MX-7c for emacs-devel@gnu.org; Wed, 16 Aug 2023 01:35:25 -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 1qW9Bi-0003Ii-5C for emacs-devel@gnu.org; Wed, 16 Aug 2023 01:35:24 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1qW9Bf-0003Ri-QT for emacs-devel@gnu.org; Wed, 16 Aug 2023 07:35:19 +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: Wed, 16 Aug 2023 07:11:27 -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:308808 Archived-At: Gerd Möllmann wrote: >> I don't know about SBCL, but as for Emacs, refer to the >> definition of VALBITS in lisp.h (maybe also the right files >> among m/*.h and s/*.h, but I have no idea where they've >> disappeared to.) > > The SBCL I have here, a Homebrew installation, uses the > scheme where > > ....0 -> fixnum > ....1 -> other objects (discriminated by additional tag bits) > > I had the same for Emacs in the branch gerd_int in the > 2000s, if memory serves me. Ah, there is `fixnump' (and `bignump') to test for a specific number, (fixnump (expt 2 60)) ; t (fixnump (expt 2 61)) ; nil 2^60 = 1152921504606846976, so that's pretty big. -- underground experts united https://dataswamp.org/~incal