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inequality propagation

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2021-08-08 13:21:15 -07:00
parent a4696a1c27
commit 6a829f831d
7 changed files with 720 additions and 56 deletions
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51
src/math/interval/mod_interval_def.h
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@ -95,19 +95,46 @@ mod_interval<Numeral> mod_interval<Numeral>::operator&(mod_interval const& other
return other;
if (other.is_free() || is_empty())
return *this;
if (contains(other.lo))
l = other.lo;
else if (other.contains(lo))
l = lo;
else
return mod_interval::empty();
if (contains(other.hi - 1))
h = other.hi;
else if (other.contains(hi - 1))
h = hi;
else
return mod_interval::empty();
if (lo < hi || hi == 0) {
if (other.lo < other.hi || other.hi == 0) {
if (hi != 0 && hi <= other.lo)
return mod_interval::empty();
if (other.hi != 0 && other.hi <= lo)
return mod_interval::empty();
l = lo >= other.lo ? lo : other.lo;
h = hi == 0 ? other.hi : (other.hi == 0 ? hi : (hi <= other.hi ? hi : other.hi));
return mod_interval(l, h);
}
SASSERT(0 < other.hi && other.hi < other.lo);
if (other.lo <= lo)
return *this;
if (other.hi <= lo && lo < hi && hi <= other.lo)
return mod_interval::empty();
if (lo <= other.hi && other.hi <= hi && hi <= other.lo)
return mod_interval(lo, other.hi);
if (hi == 0 && lo < other.hi)
return *this;
if (hi == 0 && other.hi <= lo)
return mod_interval(other.lo, hi);
if (other.hi <= lo && other.hi <= hi)
return mod_interval(other.lo, hi);
return *this;
}
SASSERT(hi < lo);
if (other.lo < other.hi || other.hi == 0)
return other & *this;
SASSERT(other.hi < other.lo);
SASSERT(hi != 0);
SASSERT(other.hi != 0);
if (lo <= other.hi)
return *this;
if (other.lo <= hi)
return other;
l = lo <= other.lo ? other.lo : lo;
h = hi >= other.hi ? other.hi : hi;
return mod_interval(l, h);
}
template<typename Numeral>