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Top 14 C++ Avx2 Projects
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simdjson
Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks
Project mention: Make Ubuntu packages 90% faster by rebuilding them | news.ycombinator.com | 2025-03-18I think parsing once into a faster format (sqlite3 or parquet) would be more beneficial.
https://simdjson.org/
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I quite like highway.
As mentioned, last time I tried vqsort for RVV it was surprisingly slow.
I tried to replicate it yesterday, but noticed that vqsort is now disabled for RVV: https://github.com/google/highway/blob/400fbf20f2e40b984be12...
Does highway support sorting networks for non-128-bit vector registers?
When I tried to compile it for AVX512, the BaseCase seems to only use xmm registers: https://godbolt.org/z/qr9xoTGKn
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Thanks for the added context on the builds! As "foreign" BW player and fellow speech processing researcher, I agree shallow contextual biasing should help. While not difficult to implement, most generally available ASR solutions don't make it easy to use. There's a PR in ctranslate2 implementing the same feature so that it could be exposed in faster-whisper: https://github.com/OpenNMT/CTranslate2/pull/1789
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DirectXMath
DirectXMath is an all inline SIMD C++ linear algebra library for use in games and graphics apps
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Project mention: Understanding SIMD: Infinite Complexity of Trivial Problems | news.ycombinator.com | 2024-11-30
I'm surprised no one has mentioned Vc. I found ispc clunky and not as performant, and std::simd didn't support some useful math ops like rsqrt. Vc has been around for years, I have no trouble including it in my codes, it has masking and many of the most useful math ops, and I can get over 1 TF/s on a consumer-grade Ryzen and at least 3 TF/s on the big Epyc CPUs.
https://github.com/VcDevel/Vc
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simdutf
Unicode routines (UTF8, UTF16, UTF32) and Base64: billions of characters per second using SSE2, AVX2, NEON, AVX-512, RISC-V Vector Extension, LoongArch64, POWER. Part of Node.js, WebKit/Safari, Ladybird, Chromium, Cloudflare Workers and Bun.
Lemire and collaborators often write in C++ intrinsics, or thin platform-specific wrappers on top of them.
I count ~8 different implementations [1], which demonstrates considerable commitment :) Personally, I prefer to write once with portable intrinsics.
https://github.com/simdutf/simdutf/tree/1d5b5cd2b60850954df5...
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Here is a bunch of simple examples: https://github.com/jfalcou/eve/blob/fb093a0553d25bb8114f1396...
I personally think we have the following strenghs:
* Algorithms. Writing SIMD loops is very hard. We give you a lot of ready to go loops. (find, search, remove, set_intersection to name a few).
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Project mention: Copilot implemented a ThreadPool to serve as a replacement for OpenMP | news.ycombinator.com | 2025-05-09
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Im upgrading avx2 to avx512 (where possible) in my reimplementation of RandomX algorithm: https://github.com/patrulek/modernRX
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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++ Avx2 discussion
C++ Avx2 related posts
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Copilot implemented a ThreadPool to serve as a replacement for OpenMP
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Three Fundamental Flaws of SIMD
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C Is Not Suited to SIMD
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Intel Releases x86-SIMD-sort 6.0 for 10x faster AVX2/AVX-512 Sorting
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User-Space Interrupts (2021)
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Highway – Portable SIMD Library
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SIMD-accelerated computer vision on a $2 microcontroller
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www.saashub.com | 15 May 2025
Index
What are some of the best open-source Avx2 projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | simdjson | 20,284 |
| 2 | highway | 4,615 |
| 3 | CTranslate2 | 3,791 |
| 4 | DirectXMath | 1,652 |
| 5 | Vc | 1,483 |
| 6 | simdutf | 1,366 |
| 7 | libsimdpp | 1,273 |
| 8 | eve | 1,188 |
| 9 | x86-simd-sort | 931 |
| 10 | toys | 355 |
| 11 | sse-popcount | 337 |
| 12 | CPURasterizer | 179 |
| 13 | std_find_simd | 21 |
| 14 | modernRX | 14 |
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