Google Highway

Google Highway is a high-performance C++ library designed to provide portable SIMD (Single Instruction, Multiple Data) vectorization across multiple CPU architectures while maintaining predictable and efficient behavior. It abstracts low-level vector intrinsics into a consistent API that maps closely to hardware instructions, allowing developers to write high-performance code without relying heavily on compiler auto-vectorization. Highway enables the same source code to run across different platforms and instruction sets, including architectures with scalable vector lengths, which are not known at compile time. This portability is achieved through dynamic or static dispatch mechanisms that select the best available instruction set at runtime or compile time. The library is designed for developers who need to maximize CPU performance in domains such as image processing, compression, cryptography, and scientific computing.