pub type q63 = i64;Expand description
Wide accumulator type used for dot products, sums-of-squares, and other
reductions that need headroom beyond i32. This is a plain integer, not
a Q1.63 fixed-point value: nothing here divides by a scale factor, and
several call sites divide by an element count, which would be meaningless
under a [-1.0, 1.0)-range fixed-point interpretation.