From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.bugs Subject: bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position. Date: Sun, 07 Feb 2021 22:52:53 +0100 Message-ID: <87v9b3wnnu.fsf@gnus.org> References: <83y4aclofm.fsf@gnu.org> <878s7z532u.fsf@gnus.org> <87y2fz3lpe.fsf@gnus.org> <87h7mn22ls.fsf@gnus.org> <83eehrn408.fsf@gnu.org> <87y2fzzqxb.fsf@gnus.org> <87tuqnzqh2.fsf@gnus.org> <83blcvn1ku.fsf@gnu.org> <87czxbznly.fsf@gnus.org> <834kinmzpy.fsf@gnu.org> <87zh0fy82q.fsf@gnus.org> <83y2fzlkpk.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="11510"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: 22763@debbugs.gnu.org, esq@lawlist.com, monnier@iro.umontreal.ca To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Feb 07 22:54:30 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1l8s0k-0002ro-2O for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 07 Feb 2021 22:54:30 +0100 Original-Received: from localhost ([::1]:57886 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l8s0j-0003Mv-50 for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 07 Feb 2021 16:54:29 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36952) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l8s0I-0003Ln-Ek for bug-gnu-emacs@gnu.org; Sun, 07 Feb 2021 16:54:02 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:37561) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1l8s0I-0006Fr-72 for bug-gnu-emacs@gnu.org; Sun, 07 Feb 2021 16:54:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1l8s0I-0000aZ-4V for bug-gnu-emacs@gnu.org; Sun, 07 Feb 2021 16:54:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Lars Ingebrigtsen Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 07 Feb 2021 21:54:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 22763 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: fixed Original-Received: via spool by 22763-submit@debbugs.gnu.org id=B22763.16127348012215 (code B ref 22763); Sun, 07 Feb 2021 21:54:02 +0000 Original-Received: (at 22763) by debbugs.gnu.org; 7 Feb 2021 21:53:21 +0000 Original-Received: from localhost ([127.0.0.1]:49107 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1l8rzd-0000Zf-KO for submit@debbugs.gnu.org; Sun, 07 Feb 2021 16:53:21 -0500 Original-Received: from quimby.gnus.org ([95.216.78.240]:40216) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1l8rzZ-0000ZP-UN for 22763@debbugs.gnu.org; Sun, 07 Feb 2021 16:53:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org; s=20200322; h=Content-Type:MIME-Version:Message-ID:In-Reply-To:Date: References:Subject:Cc:To:From:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=uaBr7Ox6iLxBH1CaC8KIxOwTCWtBrG5IbWvH32x67g0=; b=BAS2/cIuqT7sqYLA7wTXckVvUK Y51+Yjy97LcRGZ8xwBciQOiAGu2P9itaqyp1yFguffCiDYfeVc+NK+qYnvObFKQid1GYPfmsdLTDF nWbXl1Q0Sp4ydAzXxKVQGGd0pe5MhpPFPOg0GIZnF/Ruxs8Y/tsPhPn20lN4mO718ExQ=; Original-Received: from cm-84.212.202.86.getinternet.no ([84.212.202.86] helo=xo) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l8rzC-0005Kl-PT; Sun, 07 Feb 2021 22:53:03 +0100 X-Now-Playing: =?UTF-8?Q?Gar=C3=A7ons's?= _Divorce_: "Critics" In-Reply-To: <83y2fzlkpk.fsf@gnu.org> (Eli Zaretskii's message of "Sun, 07 Feb 2021 21:52:07 +0200") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:199573 Archived-At: Eli Zaretskii writes: >> Perhaps memchr has gotten faster over the years? > > No, it was fast then as well (due to inlining, AFAIR). > > I think the main factor is the file used to benchmark this stuff. I > don't remember what I used. I was curious as to how memchr is implemented these days: https://code.woboq.org/userspace/glibc/string/memchr.c.html It seems it tests one longword_ptr at a time? So that's 8 bytes on 64-bit CPUs, I think. Doesn't look like any SSE/AVX support, though. -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no