see 1. https://github.com/asmjit/asmjit 2. https://github.com/hypeartist/AsmJit 3. https://github.com/blend2d/blend2d --- also https://www.codeproject.com/Tips/855149/Csharp-Fast-Memory-Copy-Method-with-x-Assembly-Usa https://blogs.msdn.microsoft.com/devinj/2005/07/13/dynamically-writing-and-executing-native-assembly-in-c/ https://blogs.msdn.microsoft.com/dotnet/2018/10/10/using-net-hardware-intrinsics-api-to-accelerate-machine-learning-scenarios/?utm_source=vs_developer_news&utm_medium=referral https://github.com/google/swiftshader https://github.com/john-h-k/MathSharp --- OR https://github.com/ispc/ispc
see
also
https://www.codeproject.com/Tips/855149/Csharp-Fast-Memory-Copy-Method-with-x-Assembly-Usa
https://blogs.msdn.microsoft.com/devinj/2005/07/13/dynamically-writing-and-executing-native-assembly-in-c/
https://blogs.msdn.microsoft.com/dotnet/2018/10/10/using-net-hardware-intrinsics-api-to-accelerate-machine-learning-scenarios/?utm_source=vs_developer_news&utm_medium=referral
https://github.com/google/swiftshader
https://github.com/john-h-k/MathSharp
OR
https://github.com/ispc/ispc