From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: StrawberryTea Newsgroups: gmane.emacs.devel Subject: How do I use `native-comp-compiler-options`? Date: Sun, 03 Sep 2023 11:54:03 -0500 Message-ID: <87pm2z5has.fsf@strawberrytea.xyz> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="35339"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:E6lKts6zRW4YbXdaiisjtVoW1ow= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sun Sep 03 18:55:47 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 1qcqO3-00091t-9l for ged-emacs-devel@m.gmane-mx.org; Sun, 03 Sep 2023 18:55:47 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qcqNY-0000C6-9r; Sun, 03 Sep 2023 12:55:16 -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 1qcqNV-0000BQ-Tz for emacs-devel@gnu.org; Sun, 03 Sep 2023 12:55:13 -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 1qcqNN-0004Af-Hg for emacs-devel@gnu.org; Sun, 03 Sep 2023 12:55:07 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1qcqNK-00081v-Jw for emacs-devel@gnu.org; Sun, 03 Sep 2023 18:55:02 +0200 X-Injected-Via-Gmane: http://gmane.org/ 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-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:310007 Archived-At: Hi. So I'm just wondering how to use `native-comp-compiler-options`. Does it just take the same values that CFLAGS can take? I'm asking because I patched my Emacs to define `native-comp-compiler-options` as ``` `("-march=skylake" "-Ofast" "-g0" "-fno-finite-math-only" "-fomit-frame-pointer" "-malign-data=cacheline" "-fira-region=mixed" "-fira-algorithm=CB" "-fira-hoist-pressure" "-fira-loop-pressure" "-floop-nest-optimize" "-fgraphite-identity") ``` but I don't really notice any difference in performance in usage nor in any of the benchmarks in my config file: https://github.com/lemonbreezes/cae-emacs/blob/master/benchmarks/seq-cl-dash-benchmarks.org?plain=1#L9 https://github.com/lemonbreezes/cae-emacs/blob/master/benchmarks/silly-loop.el#L3 Nor do I see a difference when I compile `silly-loop` with and without the above options. I am using `native-comp-speed` 3 and lexical binding for all files and my GCC version is ``` gcc (Gentoo 14.0.0 p, commit d0b55776a4e1d2f293db5ba0e4a04aefed055ec4) 14.0.0 20230903 (experimental) a7d052b3200c7928d903a0242b8cfd75d131e374 ``` I'm not sure if it's because my benchmarks are too trivial or because I have `native-comp-speed` 3 so there is not much to optimize beyond that. I definitely do notice the numbers change more when I recompile Emacs itself with different CFLAGS and I think I did notice a difference bumpin `native-comp-speed` up from 2 to 3 but not from setting `native-comp-compiler-options`.