From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Philipp Newsgroups: gmane.emacs.bugs Subject: bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position. 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Sun, 07 Feb 2021 14:09:12 -0800 (PST) In-Reply-To: <87v9b3wnnu.fsf@gnus.org> X-Mailer: Apple Mail (2.3654.60.0.2.21) 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:199575 Archived-At: > Am 07.02.2021 um 22:52 schrieb Lars Ingebrigtsen : >=20 > Eli Zaretskii writes: >=20 >>> Perhaps memchr has gotten faster over the years? >>=20 >> No, it was fast then as well (due to inlining, AFAIR). >>=20 >> I think the main factor is the file used to benchmark this stuff. I >> don't remember what I used. >=20 > I was curious as to how memchr is implemented these days: >=20 > https://code.woboq.org/userspace/glibc/string/memchr.c.html >=20 > 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. I think that=E2=80=99s only the unoptimized generic version, there are = architecture-specific versions like = https://sourceware.org/git/?p=3Dglibc.git;a=3Dblob;f=3Dsysdeps/x86_64/memc= hr.S;h=3Dbeff2708de6a1e40de4141f94ff6fe763f041164;hb=3DHEAD.=