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fixing #1520

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-07-28 18:03:13 -07:00
commit 1cb3f7c792
27 changed files with 340 additions and 272 deletions
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15
src/smt/old_interval.cpp
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@ -561,15 +561,24 @@ interval & interval::operator/=(interval const & other) {
TRACE("interval", other.display_with_dependencies(tout););
if (other.m_lower.is_pos() || (other.m_lower.is_zero() && other.m_lower_open)) {
// other.lower > 0
// x in ([0, 0] / [other.lo, other.up]), for other.lo > 0
// <=>
// x >= 0: because y*x >= 0 & y > 0
// x <= 0: because y*x <= 0 & y > 0
m_lower_dep = join(m_lower_dep, other.m_lower_dep);
m_upper_dep = join(m_upper_dep, other.m_lower_dep);
}
else {
// assertion must hold since !other.contains_zero()
SASSERT(other.m_upper.is_neg() || (other.m_upper.is_zero() && other.m_upper_open));
SASSERT(other.m_upper.is_neg() || (other.m_upper.is_zero() && other.m_upper_open));
// other.upper < 0
m_lower_dep = join(m_lower_dep, other.m_upper_dep);
m_upper_dep = join(m_upper_dep, other.m_upper_dep);
// x in ([0, 0] / [other.lo, other.up]), for up < 0
// <=>
// x >= 0: because y*x <= 0 & y < 0
// x <= 0: because y*x >= 0 & y < 0
v_dependency* lower_dep = m_lower_dep;
m_lower_dep = join(m_upper_dep, other.m_upper_dep);
m_upper_dep = join(lower_dep, other.m_upper_dep);
}
return *this;
}