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Fix bug reported by Florian <corzilius@cs.rwth-aachen.de>

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2013-06-21 10:31:11 -07:00
parent a60b53bfd8
commit 42898f3276
1 changed files with 16 additions and 2 deletions
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18
src/nlsat/nlsat_explain.cpp
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@ -993,8 +993,22 @@ namespace nlsat {
}
return;
}
else if (s == -1 && !is_even) {
atom_sign = -atom_sign;
else {
// We have shown the current factor is a constant MODULO the sign of the leading coefficient (of the equation used to rewrite the factor).
if (!info.m_lc_const) {
// If the leading coefficient is not a constant, we must store this information as an extra assumption.
if (d % 2 == 0 || // d is even
is_even || // rewriting a factor of even degree, sign flip doesn't matter
_a->get_kind() == atom::EQ) { // rewriting an equation, sign flip doesn't matter
info.add_lc_diseq();
}
else {
info.add_lc_ineq();
}
}
if (s == -1 && !is_even) {
atom_sign = -atom_sign;
}
}
}
else {