mul_hi

Computes x * y and returns the high half of the product of x and y.

template <typename I, detail::enable_if_t<(detail::builtin::is_geninteger<I>::value), int> >
I mul_hi(I x, I y)

1. Computes `x * y` and returns the high half of the product of `x` and `y`.
   Parameters:
   • I x
   • I y