Note assembly language is OS-specific because different OSes have different ABI. Unfortunately, this is very relevant to SIMD https://learn.microsoft.com/en-us/

Note assembly language is OS-specific because different OSes have different ABI. Unfortunately, this is very relevant to SIMD https://learn.microsoft.com/en-us/cpp/build/x64-software-conventions?view=msvc-170#register-volatility-and-preservation https://learn.microsoft.com/en-us/cpp/build/x64-software-con... And causes real-life bugs in the software with pieces written in assembly. I think this makes assembly poor choice for writing software in modern ecosystem. Modern C and C++ compilers have SIMD intrinsics. SIMD intrinsics are OS agnostic, modern compilers follow these ABI conventions carefully. SIMD intrinsics are ISA-specific just like assembly. Unlike higher-level abstraction libraries or automatic vectorizers, SIMD intrinsics allow to match performance of the assembly.