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: Shrinking the C core Date: Sun, 27 Aug 2023 05:53:16 +0200 Message-ID: <87jzth3zv7.fsf@dataswamp.org> 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> <837cppwn09.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32881"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:8EYCjoDRMQsxOTyFQ26sN+Wy4x4= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Aug 27 06:20:32 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 1qa7GK-0008OU-9m for ged-emacs-devel@m.gmane-mx.org; Sun, 27 Aug 2023 06:20:32 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qa7Fc-0004om-Ir; Sun, 27 Aug 2023 00:19:48 -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 1qa6rk-0007gA-S7 for emacs-devel@gnu.org; Sat, 26 Aug 2023 23:55:08 -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 1qa6rh-0003WL-9L for emacs-devel@gnu.org; Sat, 26 Aug 2023 23:55:07 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1qa6re-000A8U-DW for emacs-devel@gnu.org; Sun, 27 Aug 2023 05:55:02 +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: Sun, 27 Aug 2023 00:19:46 -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:309297 Archived-At: Eli Zaretskii wrote: > Andrea will correct me if I'm wrong, but AFAIU Ihor is > correct: native compilation in Emacs emits a kind of GIMPLE, > which is then subject to GCC optimization pass. That's why > we have the native-comp-speed variable, which is mapped > directly into the GCC's -On optimization switches, with n = > 0..3. The docstring for `native-comp-speed'. Optimization level for native compilation, a number between -1 and 3. -1 functions are kept in bytecode form and no native compilation is performed (but *.eln files are still produced, and include the compiled code in bytecode form). 0 native compilation is performed with no optimizations. 1 light optimizations. 2 max optimization level fully adherent to the language semantic. 3 max optimization level, to be used only when necessary. Warning: with 3, the compiler is free to perform dangerous optimizations. I have that 2, which is the default value. Maybe I should try 3 and see if something breaks. I wonder what those dangerous optimizations are? -- underground experts united https://dataswamp.org/~incal