pub fn sat_sub(a: u64, b: u64, sew: Vsew, vxsat: &mut bool) -> u64
Saturating signed subtract: vs2 - src, clamped to [-(2^(SEW-1)), 2^(SEW-1) - 1].
vs2 - src
[-(2^(SEW-1)), 2^(SEW-1) - 1]
Sets vxsat to true on overflow.
vxsat
true