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Top 7 C++ simd-instruction Projects
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What about Highway? https://github.com/google/highway I suppose that's C++ not C though.
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xsimd
C++ wrappers for SIMD intrinsics and parallelized, optimized mathematical functions (SSE, AVX, AVX512, NEON, SVE))
Thanks, that's an important caveat!
> Meanwhile xsimd (https://github.com/xtensor-stack/xsimd) has the feature level as a template parameter on its vector objects
That's pretty cool because you can write function templates and instantiate different versions that you can select at runtime!
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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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Project mention: VOLK: Vector-Optimized Library of Kernels for GNU Radio | news.ycombinator.com | 2024-08-02
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SIMDCompressionAndIntersection
A C++ library to compress and intersect sorted lists of integers using SIMD instructions
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Jsonifier
A few classes for extremely fast json parsing/serializing in modern C++. Possibly the fastest json parser in C++. Possibly the fastest json serializer in C++. (by RealTimeChris)
Project mention: Achieving a 600% Performance Improvement in String-Literal Comparisons | news.ycombinator.com | 2025-02-18 -
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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-instructions discussion
C++ simd-instructions related posts
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Understanding SIMD: Infinite Complexity of Trivial Problems
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Why those particular integer multiplies?
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Highway – Portable SIMD Library
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VOLK: Vector-Optimized Library of Kernels for GNU Radio
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Highway: C++ library that provides portable SIMD/vector intrinsics
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Llamafile 0.7 Brings AVX-512 Support: 10x Faster Prompt Eval Times for AMD Zen 4
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Gemma.cpp: lightweight, standalone C++ inference engine for Gemma models
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Index
What are some of the best open-source simd-instruction projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | highway | 4,480 |
| 2 | xsimd | 2,331 |
| 3 | Vc | 1,475 |
| 4 | volk | 571 |
| 5 | SIMDCompressionAndIntersection | 430 |
| 6 | Jsonifier | 74 |
| 7 | std_find_simd | 21 |
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