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From: Philipp
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Subject: bug#22763: 25.1.50;
Feature Request -- A faster method to obtain line number at position.
Date: Sun, 7 Feb 2021 23:09:11 +0100
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To: Lars Ingebrigtsen
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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.=