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use crate::{
abstr::{BitvectorDomain, Boolean},
bitvector::BitvectorBound,
forward::TypedCmp,
};
use super::ThreeValuedBitvector;
impl<B: BitvectorBound> TypedCmp for ThreeValuedBitvector<B> {
type Output = crate::abstr::Boolean;
fn ult(self, rhs: Self) -> Self::Output {
assert_eq!(self.bound(), rhs.bound());
// use unsigned versions
let lhs_min = self.umin();
let lhs_max = self.umax();
let rhs_min = rhs.umin();
let rhs_max = rhs.umax();
// can be zero if lhs can be greater or equal to rhs
// this is only possible if lhs max can be greater or equal to rhs min
let result_can_be_zero = lhs_max >= rhs_min;
// can be one if lhs can be lesser than rhs
// this is only possible if lhs min can be lesser than rhs max
let result_can_be_one = lhs_min < rhs_max;
Boolean::from_bools(result_can_be_zero, result_can_be_one)
}
fn ule(self, rhs: Self) -> Self::Output {
assert_eq!(self.bound(), rhs.bound());
// use unsigned versions
let lhs_min = self.umin();
let lhs_max = self.umax();
let rhs_min = rhs.umin();
let rhs_max = rhs.umax();
// can be zero if lhs can be greater than rhs
// this is only possible if lhs max can be greater to rhs min
let result_can_be_zero = lhs_max > rhs_min;
// can be one if lhs can be lesser or equal to rhs
// this is only possible if lhs min can be lesser or equal to rhs max
let result_can_be_one = lhs_min <= rhs_max;
Boolean::from_bools(result_can_be_zero, result_can_be_one)
}
fn slt(self, rhs: Self) -> Self::Output {
assert_eq!(self.bound(), rhs.bound());
// use signed versions
let lhs_min = self.smin();
let lhs_max = self.smax();
let rhs_min = rhs.smin();
let rhs_max = rhs.smax();
// can be zero if lhs can be greater or equal to rhs
// this is only possible if lhs max can be greater or equal to rhs min
let result_can_be_zero = lhs_max >= rhs_min;
// can be one if lhs can be lesser than rhs
// this is only possible if lhs min can be lesser than rhs max
let result_can_be_one = lhs_min < rhs_max;
Boolean::from_bools(result_can_be_zero, result_can_be_one)
}
fn sle(self, rhs: Self) -> Self::Output {
assert_eq!(self.bound(), rhs.bound());
// use signed versions
let lhs_min = self.smin();
let lhs_max = self.smax();
let rhs_min = rhs.smin();
let rhs_max = rhs.smax();
// can be zero if lhs can be greater than rhs
// this is only possible if lhs max can be greater to rhs min
let result_can_be_zero = lhs_max > rhs_min;
// can be one if lhs can be lesser or equal to rhs
// this is only possible if lhs min can be lesser or equal to rhs max
let result_can_be_one = lhs_min <= rhs_max;
Boolean::from_bools(result_can_be_zero, result_can_be_one)
}
}