Bun team is rewriting SIMD from Rust to C++

#1

Post by impoppy » Mon, May 25, 2026, 11:24 AM UTC

Bun team is rewriting SIMD from Rust to C++
github.com

Re: Bun team is rewriting SIMD from Rust to C++

#2

Post by 1vuio0pswjnm7 » Mon, May 25, 2026, 11:46 AM UTC

column #

1. input (release builds, x64 AVX-512 host)

2. main (Rust)

3. this PR (C++ + highway)

4. speedup

"ascii, 4.6k chars 2.33 µs 106 ns 22×"

Re: Bun team is rewriting SIMD from Rust to C++

#3

Post by re-thc » Mon, May 25, 2026, 11:46 AM UTC

Next: C++ has issues and Zig is a better choice?

Re: Bun team is rewriting SIMD from Rust to C++

#4

Post by 1vuio0pswjnm7 » Mon, May 25, 2026, 6:15 PM UTC

1vuio0pswjnm7 wrote: post #2

column # 1. input (release builds, x64 AVX-512 host) 2. main (Rust) 3. this PR (C++ + highway) 4. speedup "ascii, 4.6k chars 2.33 µs 106 ns 22×"

Correction: 22* should be 22x

Re: Bun team is rewriting SIMD from Rust to C++

#5

Post by janwas » Tue, May 26, 2026, 6:52 PM UTC

1vuio0pswjnm7 wrote: post #4

1vuio0pswjnm7 wrote: post #2

column # 1. input (release builds, x64 AVX-512 host) 2. main (Rust) 3. this PR (C++ + highway) 4. speedup "ascii, 4.6k chars 2.33 µs 106 ns 22×"

Correction: 22* should be 22x

Impressive result. Congrats!

Re: Bun team is rewriting SIMD from Rust to C++

#6

Post by 1vuio0pswjnm7 » Mon, Jun 08, 2026, 9:16 PM UTC

janwas wrote: post #5

1vuio0pswjnm7 wrote: post #4

Earlier quoted context omitted.

Correction: 22* should be 22x

Impressive result. Congrats!

The point is using C++ instead of Rust was 22 times faster