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: Mon, 21 Aug 2023 04:36:16 +0000 Message-ID: <87sf8d57wf.fsf@localhost> References: <20230809094655.793FC18A4654@snark.thyrsus.com> <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> <87edjx7c0b.fsf@localhost> <831qfxw2cx.fsf@gnu.org> <87v8d95918.fsf@localhost> <87zg2lav4b.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="35195"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Eli Zaretskii , ams@gnu.org, incal@dataswamp.org, emacs-devel@gnu.org To: Po Lu Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Aug 21 06:36:35 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 1qXweZ-0008wv-HN for ged-emacs-devel@m.gmane-mx.org; Mon, 21 Aug 2023 06:36:35 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qXwds-0007ET-Rp; Mon, 21 Aug 2023 00:35:52 -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 1qXwdr-0007EL-08 for emacs-devel@gnu.org; Mon, 21 Aug 2023 00:35:51 -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 1qXwdo-0003LU-8w for emacs-devel@gnu.org; Mon, 21 Aug 2023 00:35:50 -0400 Original-Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id CB9F7240103 for ; Mon, 21 Aug 2023 06:35:45 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1692592545; bh=RF5PJ7a3eBT39tf91fYOK3IsincV/8w+/qK6/36//KY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:From; b=lJfphxILXoDjRYnhwI060cgLvrCJme290elR16sdSLblxVZb8IjIpJGFBWZVmFbeY oTQq38xY/N2gB7e1oI0UrIH/98jelchjtsrHMpSSCZfzpvqdILA7K8bZUbndydJt12 ld7id9+FTfVs35qHjnfhwhjH97v6ekbDgm5wt8icHCK/d7b4n7AOC0JJc5vwN54RBz 03Q6pEGUGZ7w9hUTnv8GgYp4tVTmblLXvA+v7uPiJhngM/r75aHDPTJdZvFlwroLGJ Mkj4SQQ4+sfsXHmd7UBpDnaaMDPhHq4QF861U7bTIV9VLF6Ajp9SGS96QPF5LdXt8W 83o1ner8IopSw== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4RTfmd2R23z6tn4; Mon, 21 Aug 2023 06:35:45 +0200 (CEST) In-Reply-To: <87zg2lav4b.fsf@yahoo.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:309017 Archived-At: Po Lu writes: >> However, GCC JIT has no information about the internal structure of the >> `floor' subr. Hence, it is currently unable to perform such >> optimization. >> >> It could, if it were somehow given an information about `floor' >> implementation. > > This should thus be implemented in the native compiler, without > affecting the code of Ffloor itself. I do understand that the approach you propose is indeed used, for example, for `car' in emit_lval_XCAR. However, is it practical for functions like `floor'? `car' implementation is very unlikely to change in future. But `floor' and other functions (we should not be limited to `floor') may change their implementations. The extra "native comp" copy of the implementation will need to be always synchronized with the original implementation. I doubt that it is practical maintenance-wise. -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at