GNU bug report logs - #22763
25.1.50; Feature Request -- A faster method to obtain line number at position.

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 22763 <at> debbugs.gnu.org, esq <at> lawlist.com, monnier <at> iro.umontreal.ca
Subject: bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position.
Date: Mon, 08 Feb 2021 05:34:33 +0200

> From: Lars Ingebrigtsen <larsi <at> gnus.org>
> Cc: 22763 <at> debbugs.gnu.org,  esq <at> lawlist.com,  monnier <at> iro.umontreal.ca
> Date: Sun, 07 Feb 2021 22:58:12 +0100
> 
> Never mind -- there are even more optimised versions using SSE2 etc,
> too:
> 
> https://github.com/lattera/glibc/blob/master/sysdeps/x86_64/memchr.S

You need to look at the code emitted by GCC under -O2.  glibc is not
necessarily relevant here.

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