C Avx2

Open-source C projects categorized as Avx2
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Top 14 C Avx2 Projects

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  1. simde

    Implementations of SIMD instruction sets for systems which don't natively support them.

    Project mention: SIMDe | news.ycombinator.com | 2026-05-30

  2. SaaSHub

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  3. CRoaring

    Roaring bitmaps in C (and C++), with SIMD (AVX2, AVX-512 and NEON) optimizations: used by Apache Doris, ClickHouse, Alibaba Tair, Redpanda, YDB and StarRocks

    Project mention: Time is of the essence: EBR in High-Performance Databases | dev.to | 2026-03-01

    The nature of the problem is this: Memory gets allocated for some type of structure. In my case, it's a data structure containing a roaring bitmap, which is an implementation of bitmaps that are highly optimized and great for doing set-based calculations (AND/OR etc).

  4. TurboPFor

    Fastest Integer Compression

  5. sleef

    SIMD Library for Evaluating Elementary Functions, vectorized libm and DFT

    Project mention: Faster Asin() Was Hiding in Plain Sight | news.ycombinator.com | 2026-03-11

    I'm sorry, that second reference was actually for the 3.5ULP variant. The 1 ULP is here: https://github.com/shibatch/sleef/blob/master/src/libm/sleef...

  6. nsimd

    Agenium Scale vectorization library for CPUs and GPUs

  7. Turbo-Base64

    Turbo Base64 - Fastest Base64 SIMD:SSE/AVX2/AVX512/Neon/Altivec - Faster than memcpy!

  8. TurboRLE

    TurboRLE-Fastest Run Length Encoding

  9. utf8

    Fast UTF-8 validation with range algorithm (NEON+SSE4+AVX2) (by cyb70289)

  10. NZ1

    NZ1 - NanoZip 1: ultra-fast, dependency-free, portable C compression library optimized for embedded and high-performance use. Full docs: https://ferki-git-creator.github.io/nz1-site/

    Project mention: NZ1 – compact compression library for embedded systems | news.ycombinator.com | 2025-08-17

    NZ1 is a small compression library designed for embedded systems and IoT.

    Minimal code with no external dependencies.

    SIMD support (AVX2, NEON, SSE2) for fast compression and decompression.

    Configurable window size (1 KB–1 MB).

    Built-in CRC32 for data integrity.

    Achieves high compression ratios on repeating data with stable speeds (~30 MB/s).

    Repository: https://github.com/Ferki-git-creator/NZ1

    Full docs: https://ferki-git-creator.github.io/nz1-site/

  11. fast_topk_batched

    High-performance batched Top-K selection for CPU inference. Up to 80x faster than PyTorch, optimized for LLM sampling with AVX2 SIMD.

    Project mention: Fast_topk_batched: High-performance batched Top-K selection for CPU inference | news.ycombinator.com | 2026-01-19

  12. simdgrep

    grep files with speed

    Project mention: Show HN: Simdgrep is a file grepper not written in Rust | news.ycombinator.com | 2025-08-26

  13. flatline

    Constant-time utilities for C. If time varies, secrets leak. Flatline it. (by stateless-me)

    Project mention: Think memcmp is safe? Think again | news.ycombinator.com | 2025-10-29

  14. fc

    fc is a research-grade, lossless floating point compressor.

    Project mention: Fc, a lossless compressor for floating-point streams | news.ycombinator.com | 2026-05-10

  15. facex

    Fast face embedding library. 3ms, 7MB, zero dependencies. Beats ONNX Runtime on CPU.

    Project mention: FaceX – Face embedding in 3ms with handwritten C and AVX2,no dependencies | news.ycombinator.com | 2026-04-25

    questions about the SIMD kernels or the optimization journey.

    Source: https://github.com/facex-engine/facex

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).

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Index

What are some of the best open-source Avx2 projects in C? This list will help you:

# Project Stars
1 simde 3,035
2 CRoaring 1,837
3 TurboPFor 833
4 sleef 831
5 nsimd 342
6 Turbo-Base64 329
7 TurboRLE 289
8 utf8 85
9 NZ1 33
10 fast_topk_batched 16
11 simdgrep 3
12 flatline 3
13 fc 0
14 facex 0

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