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Top 23 C Simd Projects
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john
John the Ripper jumbo - advanced offline password cracker, which supports hundreds of hash and cipher types, and runs on many operating systems, CPUs, GPUs, and even some FPGAs
My quest to crack this Wi-Fi password led me deep into the world of network security. I learned about tools like aircrack-ng and John the Ripper. I discovered the concept of packet capture and the vulnerabilities of WPS-protected networks. But more importantly, this journey led me to a revelation that would change everything: Android was built on the Linux kernel.
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You can use https://github.com/simd-everywhere/simde if you like. In general portable SIMD libraries are of limited utility because having different primitives available on different architectures means that you should approach problems differently. That is to say, in many cases using any portable SIMD API to solve your problem means leaving 200% speedups on the table on at least one of your top 3 targets.
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StringZilla
Up to 10x faster strings for C, C++, Python, Rust, Swift & Go, leveraging NEON, AVX2, AVX-512, SVE, & SWAR to accelerate search, hashing, sort, edit distances, and memory ops 🦖
64 KB is a pretty significant budget for such a small operation. I've had a variant that uses 768 bytes with some extra logic, but will deprecate that kernel soon.
https://github.com/ashvardanian/StringZilla/blob/0d47be212c5...
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XNNPACK
High-efficiency floating-point neural network inference operators for mobile, server, and Web
Project mention: Ask HN: If you are a Machine Learning engineer, what do you do at work? | news.ycombinator.com | 2024-06-07A lot do, personally, every single time I try to go back to conda/mamba whatever, I get some extremely weird C/C++ related linking bug - just recently, I ran into an issue where the environment was _almost_ completely isolated from the OS distro's C/C++ build infra, except for LD, which was apparently so old it was missing the vpdpbusd instruction (https://github.com/google/XNNPACK/issues/6389). Except the thing was, that wouldn't happen when building outside of of the Conda environment. Very confusing. Standard virtualenvs are boring but nearly always work as expected in comparison.
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42_CheatSheet
A comprehensive guide to 50 years of evolution of strict C programming, a tribute to Dennis Ritchie's language
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SimSIMD
Up to 200x Faster Dot Products & Similarity Metrics — for Python, Rust, C, JS, and Swift, supporting f64, f32, f16 real & complex, i8, and bit vectors using SIMD for both AVX2, AVX-512, NEON, SVE, & SVE2 📐
Project mention: How to Implement a Cosine Similarity Function in TypeScript | news.ycombinator.com | 2025-03-10It’s a nice post, but “using array methods” probably shouldn’t be placed in the “Efficient Implementation” section. As it often happens with high-level languages, a single plain old loop is faster that three array methods.
Similarly, if you plan to query those vectors in search, you should consider continuous `TypedArray` types, and smaller scalars, than the double precision `number`.
I know very little about JS, but some of the amazing HackerNews community members have previously helped port SimSIMD to JavaScript (https://github.com/ashvardanian/SimSIMD), and I wrote a blogpost covering some of those JS/TS-specifics, NumJS, and MathJS in 2023 (https://ashvardanian.com/posts/javascript-ai-vector-search/).
Hopefully it should help unlock another 10-100x in performance
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ucall
Web Serving and Remote Procedure Calls at 50x lower latency and 70x higher bandwidth than FastAPI, implementing JSON-RPC & REST over io_uring ☎️
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Project mention: SIMD Library for Evaluating Elementary Functions, Vectorized Libm and DFT | news.ycombinator.com | 2024-11-25
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Stream VByte[1,2,3] is not far away from that idea, storing the packed lengths in a separate stream from the data bytes. (There’s also a more conventional interleaved design in varint-G8IU, but Stepanov decided to fuck everyone over and patented that.)
[1] https://lemire.me/blog/2017/09/27/stream-vbyte-breaking-new-...
[2] https://arxiv.org/abs/1709.08990
[3] https://github.com/lemire/streamvbyte
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Haven't yet seen any of these beat https://github.com/liquidaty/zsv when real-world constraints are applied (e.g. we no longer assume that line ends are always \n, or that there are no dbl-quote chars, embedded commas/newlines/dbl-quotes). And maybe under the artificial conditions as well.
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ecloop
🔐💻 ecloop: A high-performance, CPU-optimized tool for computing public keys on the secp256k1 elliptic curve, with features for searching compressed & uncompressed public keys and customizable search parameters.
ecloop (c, cli) – secp256k1 elliptic curve implementation for Apple chips. Mainly an educational project to understand cryptography, SIMD optimizations, etc. Added several standard use cases for finding Bitcoin keys by brute force, but mathematically this is pointless, so as I said earlier, this is more of an interesting educational project (and I wanted to publish a series of articles on cryptography, but didn't have time last year, I hope to do it this year). Some people use this project in hopes of finding something. I also had ideas to add Metal API support – but that takes a lot of time, so I switched to other projects. Score: okay.
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camellia-simd-aesni
Camellia cipher SIMD vector implementations for x86 (with AES-NI, VAES and/or GFNI instructions), ARM (with ARMv8 Crypto Extension instructions) and POWER (with VMX+VSX+crypto instructions)
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C Simd discussion
C Simd related posts
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Show HN: Krep a High-Performance String Search Utility Written in C
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SIMD Library for Evaluating Elementary Functions, Vectorized Libm and DFT
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I'm Not a Fan of Strlcpy(3)
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Wc2: Investigates optimizing 'wc', the Unix word count program
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Singeli: High-level interface for low-level programming
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Show HN: StringZilla v3 with C++, Rust, and Swift bindings, and AVX-512 and NEON
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How fast is rolling Karp-Rabin hashing?
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Index
What are some of the best open-source Simd projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | john | 10,984 |
| 2 | simde | 2,590 |
| 3 | cglm | 2,451 |
| 4 | StringZilla | 2,459 |
| 5 | XNNPACK | 1,980 |
| 6 | 42_CheatSheet | 1,731 |
| 7 | SimSIMD | 1,286 |
| 8 | ucall | 1,193 |
| 9 | TurboPFor | 787 |
| 10 | sleef | 707 |
| 11 | hh-suite | 561 |
| 12 | fastbase64 | 432 |
| 13 | streamvbyte | 392 |
| 14 | nsimd | 329 |
| 15 | Turbo-Base64 | 297 |
| 16 | TurboRLE | 285 |
| 17 | zsv | 223 |
| 18 | despacer | 152 |
| 19 | simd_utils | 101 |
| 20 | ecloop | 24 |
| 21 | nbody | 16 |
| 22 | camellia-simd-aesni | 18 |
| 23 | wav | 13 |
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