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0 pointsburntsushi3y ago0 comments

Can you link to the source of any widely deployed grep whose "inner loop" is coded in Assembly?

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xxs3y ago

ugrep has full SSE/AVX support

https://github.com/Genivia/ugrep/blob/a3acf863803a755ff8da8c...

burntsushiOP3y ago

So does ripgrep... Which is written in Rust. So how exactly is Rust a poor fit?

And that isn't Assembly.

So I guess what you said earlier, "grep inner loops are coded straight in Assembly," was a misrepresentation. And that "Rust was a poor fit" is just empirically wrong.

metaltyphoon3y ago

If I would have to guess it would be codecs.

burntsushiOP3y ago

What do codecs have to do with grep?

int_19h3y ago

grep respects LC_CTYPE, so it has to handle text encoding (or rely on something else that does, like libc or iconv).

However, by the same token, we might as well count any assembly in the kernel that gets executed due to some syscall from grep.

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xxs3y ago

ugrep has full SSE/AVX support

https://github.com/Genivia/ugrep/blob/a3acf863803a755ff8da8c...

burntsushiOP3y ago

So does ripgrep... Which is written in Rust. So how exactly is Rust a poor fit?

And that isn't Assembly.

So I guess what you said earlier, "grep inner loops are coded straight in Assembly," was a misrepresentation. And that "Rust was a poor fit" is just empirically wrong.

metaltyphoon3y ago

If I would have to guess it would be codecs.

burntsushiOP3y ago

What do codecs have to do with grep?

int_19h3y ago

grep respects LC_CTYPE, so it has to handle text encoding (or rely on something else that does, like libc or iconv).

However, by the same token, we might as well count any assembly in the kernel that gets executed due to some syscall from grep.

2 more replies

j / k navigate · click thread line to collapse