Top 4 C++ simd-library Projects

highway

66 3,623 9.8 C++

Performance-portable, length-agnostic SIMD with runtime dispatch

Project mention: Llamafile 0.7 Brings AVX-512 Support: 10x Faster Prompt Eval Times for AMD Zen 4 | news.ycombinator.com | 2024-03-31

The bf16 dot instruction replaces 6 instructions: https://github.com/google/highway/blob/master/hwy/ops/x86_12...

Simd

1 1,971 9.6 C++

C++ image processing and machine learning library with using of SIMD: SSE, AVX, AVX-512, AMX for x86/x64, VMX(Altivec) and VSX(Power7) for PowerPC, NEON for ARM. (by ermig1979)

Project mention: The Case of the Missing SIMD Code | news.ycombinator.com | 2023-06-08

I was curious about these libraries a few weeks ago and did some searching. Is there one that's got a clearly dominating set of users or contributors?
I don't know what a good way to compare these might be, other than perhaps activity/contributor count.
[1] https://github.com/simd-everywhere/simde
[2] https://github.com/ermig1979/Simd
[3] https://github.com/google/highway
[4] https://gitlab.com/libeigen/eigen
[5] https://github.com/shibatch/sleef

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eve

6 843 8.8 C++

Expressive Vector Engine - SIMD in C++ Goes Brrrr (by jfalcou)
pure_simd

2 227 1.8 C++

A simple, extensible, portable, efficient and header-only SIMD library!

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).