Ah, you're right. I saw that the expression in the comment and in the code was the same and assumed that the commented bit was valid C++ code. You got me to look again and it's obvious that that isn't the case. I had even gone looking through the codebase to see if std::floor was included, and still missed the incorrect `^`.

I guess in that case as long as the 128-bit type supports constexpr basic math operations that should suffice to replace the hardcoded constants with their source expressions.