←back to thread

Zlib-rs is faster than C

(trifectatech.org)
341 points dochtman | 1 comments | 16 Mar 25 19:35 UTC | HN request time: 0.213s | source
Show context
YZF ◴[16 Mar 25 20:12 UTC] No.43381858[source]▶
I found out I already know Rust:

        unsafe {
            let x_tmp0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x10);
            xmm_crc0 = _mm_clmulepi64_si128(xmm_crc0, crc_fold, 0x01);
            xmm_crc1 = _mm_xor_si128(xmm_crc1, x_tmp0);
            xmm_crc1 = _mm_xor_si128(xmm_crc1, xmm_crc0);
Kidding aside, I thought the purpose of Rust was for safety but the keyword unsafe is sprinkled liberally throughout this library. At what point does it really stop mattering if this is C or Rust?

Presumably with inline assembly both languages can emit what is effectively the same machine code. Is the Rust compiler a better optimizing compiler than C compilers?

replies(30): >>43381895 #>>43381907 #>>43381922 #>>43381925 #>>43381928 #>>43381931 #>>43381934 #>>43381952 #>>43381971 #>>43381985 #>>43382004 #>>43382028 #>>43382110 #>>43382166 #>>43382503 #>>43382805 #>>43382836 #>>43383033 #>>43383096 #>>43383480 #>>43384867 #>>43385039 #>>43385521 #>>43385577 #>>43386151 #>>43386256 #>>43386389 #>>43387043 #>>43388529 #>>43392530 #
1. umanwizard ◴[17 Mar 25 06:03 UTC] No.43385577[source]▶
> I thought the purpose of Rust was for safety but the keyword unsafe is sprinkled liberally throughout this library.

This is such a widespread misunderstanding… one of the points of rust (there are many other advantages that have nothing to do with safety, but let’s ignore those for now) is that you can build safe interfaces, possibly on top of unsafe code. It’s not that all code is magically safe all the time.