3.340. __nv_umul64hi

i64 @__nv_umul64hi(i64 %x, i64 %y)

Calculate the most significant 64 bits of the product of the two 64 unsigned bit integers.

Calculate the most significant 64 bits of the 128-bit product x * y, where x and y are 64-bit unsigned integers.

Returns

Returns the most significant 64 bits of the product x * y.