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validate and fix fixed/diff

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-08-09 13:53:15 -07:00
parent d07b508ecd
commit 7b3eaf75ce
2 changed files with 47 additions and 50 deletions
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15
src/math/interval/mod_interval_def.h
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@ -148,8 +148,6 @@ Numeral mod_interval<Numeral>::closest_value(Numeral const& n) const {
return hi - 1;
}
// TBD: correctness and completeness for wrap-around semantics needs to be checked/fixed
template<typename Numeral>
mod_interval<Numeral>& mod_interval<Numeral>::intersect_uge(Numeral const& l) {
if (is_empty())
@ -262,12 +260,17 @@ mod_interval<Numeral>& mod_interval<Numeral>::intersect_diff(Numeral const& a) {
set_empty();
else if (a == lo && hi == 0 && is_max(a))
set_empty();
else if (is_free())
lo = a + 1, hi = a;
else if (0 < hi && hi < lo && a == lo)
return *this;
else if (a == lo && !is_max(a))
lo = a + 1;
else if (a + 1 == hi)
hi = a;
else if (hi == 0 && is_max(a))
hi = a;
return *this;
}
@ -275,9 +278,9 @@ template<typename Numeral>
mod_interval<Numeral>& mod_interval<Numeral>::update_lo(Numeral const& new_lo) {
SASSERT(lo <= new_lo);
if (lo < hi && hi <= new_lo)
set_empty();
set_empty();
else
lo = new_lo;
lo = new_lo;
return *this;
}
@ -285,8 +288,8 @@ template<typename Numeral>
mod_interval<Numeral>& mod_interval<Numeral>::update_hi(Numeral const& new_hi) {
SASSERT(new_hi <= hi);
if (new_hi <= lo && lo < hi)
set_empty();
set_empty();
else
hi = new_hi;
hi = new_hi;
return *this;
}