Function ramp::ll::sub_n

pub unsafe fn sub_n(wp: LimbsMut, xp: Limbs, yp: Limbs, n: i32) -> Limb

Subtracts the n least signficant limbs of yp from xp, storing the result in {wp, n}. If there was a borrow from a higher-limb (i.e., the result would be negative), it is returned.