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Top 8 C Avx2 Projects
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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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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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CRoaring
Roaring bitmaps in C (and C++), with SIMD (AVX2, AVX-512 and NEON) optimizations: used by Apache Doris, ClickHouse, Redpanda, YDB and StarRocks
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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 📐
You can always get more accuracy by expanding those 3 lines to handle more of the Taylor components… but it’s important to remember that this is still educational material.
You can find more complete examples in my SimSIMD (https://github.com/ashvardanian/SimSIMD), but they also often assume that at a certain part of a kernel, a floating point number is guaranteed to be in a certain range. This can greatly simplify the implementation for kernels like Atan2. For general-purpose inputs, go to SLEEF (https://sleef.org). Just remember that every large, complicated optimization starts with a small example.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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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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How to Implement a Cosine Similarity Function in TypeScript
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How does cosine similarity work?
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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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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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Python, C, Assembly – Faster Cosine Similarity
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A note from our sponsor - InfluxDB
www.influxdata.com | 18 Jun 2025
Index
What are some of the best open-source Avx2 projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | simde | 2,700 |
| 2 | CRoaring | 1,652 |
| 3 | SimSIMD | 1,403 |
| 4 | TurboPFor | 803 |
| 5 | fastbase64 | 433 |
| 6 | nsimd | 332 |
| 7 | Turbo-Base64 | 303 |
| 8 | TurboRLE | 288 |
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InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com