C++ std::span doesn't have comparison operators at all. If you were to write an equality operator you might use memcmp, in which case it will be exactly the sam

C++ std::span doesn't have comparison operators at all. If you were to write an equality operator you might use memcmp, in which case it will be exactly the same as memcmp, which LLVM will helpfully reinterpret as bcmp for best performance. See for example the difference between std::string::operator== and just calling memcmp yourself: https://godbolt.org/z/qn1crox8c https://godbolt.org/z/qn1crox8c