Function multiply64

include/half.hpp:1366–1373

64-bit multiplication. \param x first factor \param y second factor \return upper 32 bit of \a x * \a y rounded to nearest

		/// \param y second factor
		/// \return upper 32 bit of \a x * \a y rounded to nearest
		inline uint32 multiply64(uint32 x, uint32 y)
		{
		#if HALF_ENABLE_CPP11_LONG_LONG
			return static_cast<uint32>((static_cast<unsigned long long>(x)*static_cast<unsigned long long>(y)+0x80000000)>>32);
		#else
			return mulhi<std::round_to_nearest>(x, y);
		#endif
		}

		/// 64-bit division.
		/// \param x upper 32 bit of dividend