From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Newsgroups: gmane.emacs.bugs Subject: bug#69709: `sort` interface improvement and universal ordering predicate Date: Thu, 21 Mar 2024 15:55:43 +0100 Message-ID: <2B967217-98CA-40CE-883B-C65377C683A3@gmail.com> References: <86zfv6uqjn.fsf@gnu.org> <4391448A-C7AF-4D7F-8866-C0313956D52D@gmail.com> <8366111E-97C4-4839-AA1E-A577C81A6035@gmail.com> Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.15\)) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="34889"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 69709@debbugs.gnu.org, Gerd =?UTF-8?Q?M=C3=B6llmann?= , Eli Zaretskii , Dmitry Gutov To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Mar 21 15:57:43 2024 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 1rnJrT-0008uQ-0p for geb-bug-gnu-emacs@m.gmane-mx.org; 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[80.217.1.132]) by smtp.gmail.com with ESMTPSA id n12-20020a056512388c00b005131cf043f8sm2589973lft.155.2024.03.21.07.55.44 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 21 Mar 2024 07:55:44 -0700 (PDT) In-Reply-To: X-Mailer: Apple Mail (2.3654.120.0.1.15) 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-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:281907 Archived-At: 20 mars 2024 kl. 20.37 skrev Stefan Monnier : > IOW, I vote for `<`! That may actually be within the realms of possibility. Some snags: * Not sure if code using `<` and expect a type error for non-numbers = would be confused (probably not) * Making `value<` n-ary would slow it down a bit, unclear how much * `value<` compares markers by buffer then position, `<` by position = only * `<` can compare markers with numbers * We expect consistency and shared code for all of < > <=3D >=3D =3D /=3D = but it's unclear how `value<` would be generalised in that direction (at = least if we care about NaN correctness) Currently, `value<` treats NaN as if it were equal to any number, which = is terrible and useless but consistent with `<`. Other options would = include order NaN distinct from any number, perhaps just consider all = NaNs to be equal and put them before or after all numbers. `value<` is actually quite a bit faster than `<` which has a terribly = cumbersome implementation, except for pairs of fixnums which apparently = got special-cased in `<` and the other inequalities fairly recently. By the way, I ran some more benchmarks: it turns out that = `car-less-than-car`, the secret shortcut that you just had to know, now = gives roughly the same speed as :key #'car which is a lot more = discoverable (and works for many other types).