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: Shrinking the C core Date: Sun, 20 Aug 2023 19:24:36 +0000 Message-ID: <87edjx7c0b.fsf@localhost> References: <20230809094655.793FC18A4654@snark.thyrsus.com> <87zg2uqdmv.fsf@localhost> <87edk3gbh3.fsf@dataswamp.org> <87jztvnuyb.fsf@localhost> <875y5bdutt.fsf@dataswamp.org> <87y1i6e1uh.fsf@localhost> <874jkub40o.fsf@dataswamp.org> <87jztqdw2l.fsf@localhost> <87msym9i4r.fsf@dataswamp.org> <877cpp914t.fsf@localhost> <83fs4dwwdo.fsf@gnu.org> <874jkt90a5.fsf@localhost> <87y1i57jqi.fsf@localhost> <87pm3h7h8k.fsf@localhost> <87h6ot7cf3.fsf@localhost> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="34931"; mail-complaints-to="usenet@ciao.gmane.io" Cc: eliz@gnu.org, incal@dataswamp.org, emacs-devel@gnu.org To: "Alfred M. Szmidt" Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Aug 20 21:24:54 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 1qXo2f-0008tw-OT for ged-emacs-devel@m.gmane-mx.org; Sun, 20 Aug 2023 21:24:53 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qXo1y-0003Sx-Fm; Sun, 20 Aug 2023 15:24:10 -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 1qXo1x-0003Sk-BR for emacs-devel@gnu.org; Sun, 20 Aug 2023 15:24:09 -0400 Original-Received: from mout01.posteo.de ([185.67.36.65]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qXo1u-0008Um-SH for emacs-devel@gnu.org; Sun, 20 Aug 2023 15:24:09 -0400 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 8EE1D240027 for ; Sun, 20 Aug 2023 21:24:05 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1692559445; bh=JFxoLTvmExYlEbd044ElqXrpqgNBz6NdIBnvwkWytM4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:From; b=Hpg4FmF24UhapUzcWtuqQbcAMZXP73UfCRHDkqcuIBLOr2lkhkxWiIhEosAojE/0P kanRLgd26rk6ALiwx1TPFc46wE5O9JsvAPhb4Dxi5lkTEA9fXqdGqKXbn6JnfrUIe6 Mgyoo8vvRZSsZyGLSUyLpnVymI6d8Xg8c4WA2mny3XfemaKRzMVS1tlVNOs5y1dXRH otBMY7xT641E7ss1n83q/4KCfVTYM+gOMgFtesqsq5rlKFGHNECXKd62KQ58etFbVY Qt9Sj0iBvM/j8JJtrtVqrK4LflBHMTlvcHrYvlEZTLEIhrh8BAOrdtjA2m+sHvJVrG iCtZH3OwThKEQ== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4RTQX50dHyz6tm4; Sun, 20 Aug 2023 21:24:05 +0200 (CEST) In-Reply-To: <87h6ot7cf3.fsf@localhost> Received-SPF: pass client-ip=185.67.36.65; envelope-from=yantar92@posteo.net; helo=mout01.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:308989 Archived-At: Ihor Radchenko writes: > The only problem (AFAIU) is that GCC JIT cannot reach inside subr level, > so all these information does not benefit Emacs functions implemented in > C. If I am right here, it might actually be worth it to rewrite some of the subroutines into Elisp. For example rounding_driver (called by `floor') code is full of runtime type checks: CHECK_NUMBER (n); if (NILP (d)) ... CHECK_NUMBER (d); ... if (FIXNUMP (d)) if (XFIXNUM (d) == 0) ... if (FIXNUMP (n)) ... else if (FLOATP (d)) if (XFLOAT_DATA (d) == 0) int nscale = FLOATP (n) ? double_integer_scale (XFLOAT_DATA (n)) : 0; .. During native compilation, if type information and n and d is available, GCC might have a chance to cut a number of branches away from the above code. -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at