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Top 23 C++ Simd Projects
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ncnn
ncnn is a high-performance neural network inference framework optimized for the mobile platform
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JetBrains
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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
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As for math, that was the easiest choice as of yet. No doubt, GLM is a "gold standard" at this point. For OpenGL it is, at least. But, like with a lot of the other APIs, I decided to build a wrapper around it rather than directly reference the library in the engine's code. And for physics, well, I had not come upon that answer just yet. I did try to make my own physics logic at some point. And while it was, surprisingly, successful, I wanted more than just a simple physics layer. I wanted something more complex and, more importantly, faster than my implementation. I have not decided upon a physics library yet. But I'll cross that bridge when I come to it.
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Project mention: SIMD Perlin Noise: Beating the Compiler with SSE | news.ycombinator.com | 2025-07-23
Yes indeed, it's about 500 LOC in https://github.com/google/highway/blob/master/hwy/ops/generi....
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usearch
Fast Open-Source Search & Clustering engine × for Vectors & Arbitrary Objects × in C++, C, Python, JavaScript, Rust, Java, Objective-C, Swift, C#, GoLang, and Wolfram 🔍
In case you are searching for fun use-cases, here's how one experiment with weird similarity metrics & kNN data-structures via Cppyy (for C++ kernel), Numba (for Python), or PeachPy (for x86 Asm), interacting with a precompiled engine: https://github.com/unum-cloud/usearch/blob/main/python/READM...
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This flexibility of CUDA is a software facility, which is independent of the hardware implementation.
For any SIMD processor one can write a compiler that translates a program written for the SIMT model into SIMD instructions. For example, for the Intel/AMD CPUs with SSE4/AVX/AVX-512 ISAs, there exists a compiler of this kind (ispc: https://github.com/ispc/ispc).
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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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Simd
C++ image processing and machine learning library with using of SIMD: SSE, AVX, AVX-512, AMX for x86/x64, NEON for ARM. (by ermig1979)
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proton
Fastest SQL pipeline engine in a single C++ binary, for stream processing, analytics, observability and AI. (by timeplus-io)
Project mention: Show HN: Open-Source C++ Apache Iceberg Client with Write Support | news.ycombinator.com | 2025-03-20 -
fast_float
Fast and exact implementation of the C++ from_chars functions for number types: 4x to 10x faster than strtod, part of GCC 12, Chromium, Redis and WebKit/Safari
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kfr
Fast, modern C++ DSP framework, FFT, Sample Rate Conversion, FIR/IIR/Biquad Filters (SSE, AVX, AVX-512, ARM NEON)
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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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ada
WHATWG-compliant and fast URL parser written in modern C++, part of Internet Archive, Node.js, Clickhouse, Redpanda, Kong, Telegram, Adguard, Datadog and Cloudflare Workers.
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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.
Project mention: Simdutf: Fast Unicode Validation and Transcoding | news.ycombinator.com | 2025-06-05 -
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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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: Hlslpp: Math library using HLSL syntax with multiplatform SIMD support | news.ycombinator.com | 2025-06-11
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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.
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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How to Think About GPUs
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ISPC: Implicit SPMD Program Compiler
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Simdutf: Fast Unicode Validation and Transcoding
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USearch: Similarity Search and Clustering Engine for Vectors and Texts
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Three Fundamental Flaws of SIMD
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Show HN: Less Slow C++
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AWS Graviton 3 > Graviton 4 for Vector Similarity Search
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A note from our sponsor - Sevalla
sevalla.com | 1 Sep 2025
Index
What are some of the best open-source Simd projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | ncnn | 21,982 |
| 2 | simdjson | 21,127 |
| 3 | GLM | 10,180 |
| 4 | highway | 4,983 |
| 5 | usearch | 3,063 |
| 6 | ispc | 2,738 |
| 7 | ozz-animation | 2,651 |
| 8 | xsimd | 2,472 |
| 9 | Simd | 2,196 |
| 10 | proton | 1,877 |
| 11 | fast_float | 1,861 |
| 12 | kfr | 1,760 |
| 13 | SatDump | 1,732 |
| 14 | DirectXMath | 1,700 |
| 15 | ada | 1,581 |
| 16 | simdutf | 1,500 |
| 17 | Vc | 1,491 |
| 18 | sse2neon | 1,421 |
| 19 | libsimdpp | 1,285 |
| 20 | eve | 1,241 |
| 21 | FastNoise2 | 1,202 |
| 22 | hlslpp | 944 |
| 23 | Fastor | 803 |
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