From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ihor Radchenko Newsgroups: gmane.emacs.devel Subject: Re: [PATCH] Re: Bignum performance (was: Shrinking the C core) Date: Mon, 14 Aug 2023 09:42:22 +0000 Message-ID: <87cyzqq7sx.fsf@localhost> References: <87bkfartof.fsf@localhost> <175cf474-29c8-a482-072e-0de784ac59e8@gmail.com> <87o7jaqc31.fsf@localhost> <2d419e12-9239-de3e-47d0-38815a00025f@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="30541"; mail-complaints-to="usenet@ciao.gmane.io" Cc: incal@dataswamp.org, emacs-devel To: Gerd =?utf-8?Q?M=C3=B6llmann?= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Aug 14 11:43:01 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 1qVU6G-0007lh-Ml for ged-emacs-devel@m.gmane-mx.org; Mon, 14 Aug 2023 11:43:00 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qVU5P-0008Nj-GE; Mon, 14 Aug 2023 05:42:07 -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 1qVU5N-0008NT-Ke for emacs-devel@gnu.org; Mon, 14 Aug 2023 05:42:05 -0400 Original-Received: from mout02.posteo.de ([185.67.36.66]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qVU5J-0001Hl-FL for emacs-devel@gnu.org; Mon, 14 Aug 2023 05:42:05 -0400 Original-Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 6845D240103 for ; Mon, 14 Aug 2023 11:41:57 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1692006117; bh=HtJhKN43tVkpWgDIarthTu9FDHcx0WVfUcl4G/pni5k=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version: Content-Transfer-Encoding:From; b=F4iu8w3bNMCR662Y2WdbJMpgnhw1lof/SA0ShbVy2NKH8VASw89uR/+Vt649J22wu J9o60kKuR9fMw1YN9h8c+j9nVHi0i6AKksYNqrtsiphCQO16fkte/OAnpfuOgKQrYR fBVb+G2suM1QVQPQqdooY9WomqtUR7VeXMtVOyiTx6gp1ZM40cDR8BMel6NgC6N8pr E7VLZWbuoRAIcrS8l+y0hREASsgVZoPWqF8ldZsuY+VF1JGsG8qS0otekugxgFGa5i kqHv73g0ICLLiMZBylv0r/3TBECmmBAigv3wqAjbag9BJX4FzqDkAPyJ3OOD0Ns/eF Gszl8mD3NpLag== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4RPTv8508Sz9rxD; Mon, 14 Aug 2023 11:41:56 +0200 (CEST) In-Reply-To: <2d419e12-9239-de3e-47d0-38815a00025f@gmail.com> Received-SPF: pass client-ip=185.67.36.66; envelope-from=yantar92@posteo.net; helo=mout02.posteo.de X-Spam_score_int: -53 X-Spam_score: -5.4 X-Spam_bar: ----- X-Spam_report: (-5.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H5=-1, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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:308717 Archived-At: Gerd M=C3=B6llmann writes: > Ok. I used the code from https://dataswamp.org/~incal/cl/fib.cl/fib.cl. > ... > The declaration means we are lying to the compiler because Z gets bigger= =20 > than 53 bits eventually. And all bets are off because of the OPTIMIZE=20 > declaration. The result is that everything is done in fixnums on 64-bit= =20 > machines. That explains a lot :) I now tried (defun fib (reps num) (declare (optimize speed (safety 0) (debug 0))) (let ((z 0)) ;; (declare (type (unsigned-byte 53) reps num z)) (dotimes (r reps) (let*((p1 1) (p2 1)) (dotimes (i (- num 2)) (setf z (+ p1 p2) p2 p1 p1 z)))) z)) and got $ SBCL_HOME=3D/usr/lib64/sbcl perf record sbcl --load /tmp/fib.cl ;;; 0.263333 s real time ;;; 0.263641 s run time $ ~/Git/emacs/src/emacs -Q -batch -l /tmp/fib.eln 0.739 s Still ~3x faster compared to Elisp, but not orders of magnitude. --=20 Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at