[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#22763: 25.1.50; Feature Request -- A faster method to obtain line nu
From: |
Philipp |
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 |
> Am 07.02.2021 um 22:52 schrieb Lars Ingebrigtsen <larsi@gnus.org>:
>
> Eli Zaretskii <eliz@gnu.org> 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.
I think that’s only the unoptimized generic version, there are
architecture-specific versions like
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/x86_64/memchr.S;h=beff2708de6a1e40de4141f94ff6fe763f041164;hb=HEAD.
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., (continued)
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Eli Zaretskii, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Lars Ingebrigtsen, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Eli Zaretskii, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Lars Ingebrigtsen, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Lars Ingebrigtsen, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Eli Zaretskii, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position.,
Philipp <=
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Stefan Monnier, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Lars Ingebrigtsen, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Eli Zaretskii, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Lars Ingebrigtsen, 2021/02/07
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Eli Zaretskii, 2021/02/08
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Katsumi Yamaoka, 2021/02/08
- bug#22763: 25.1.50; Feature Request -- A faster method to obtain line number at position., Lars Ingebrigtsen, 2021/02/09