quotient_is_zero.conditionally_enforce_true(cs, divisor_is_zero);
remainder_is_zero.conditionally_enforce_true(cs, divisor_is_zero);
let uint256_zero = UInt256::zero(cs);

let rem_to_enforce = UInt32::parallel_select(
    cs,
    should_apply_mul,
    &uint256_zero.inner,
    &remainder_unchecked,
);
let a_to_enforce =
    UInt32::parallel_select(cs, should_apply_mul, src0_view, &quotient_unchecked);
let b_to_enforce = src1_view.clone();
let mul_low_to_enforce =
    UInt32::parallel_select(cs, should_apply_mul, &mul_low_unchecked, &src0_view);
let mul_high_to_enforce = UInt32::parallel_select(
    cs,
    should_apply_mul,
    &mul_high_unchecked,
    &uint256_zero.inner,
);

let mul_relation = MulDivRelation {
    a: a_to_enforce,
    b: b_to_enforce,
    rem: rem_to_enforce,
    mul_low: mul_low_to_enforce,
    mul_high: mul_high_to_enforce,
};
let apply_any = Boolean::multi_or(cs, &[should_apply_mul, should_apply_div]);
......
diffs_accumulator
    .mul_div_relations
    .push((apply_any, mul_div_relations));
