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fix minimize->maxsat

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-12-07 14:47:47 -08:00
parent da348fe1c0
commit e307c5fdda
1 changed files with 12 additions and 1 deletions
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13
src/opt/opt_context.cpp
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@ -221,7 +221,18 @@ namespace opt {
if (is_minimize(fml, term, index)) {
TRACE("opt", tout << "try to convert minimization" << mk_pp(term, m) << "\n";);
rational coeff(0);
return get_pb_sum(term, terms, weights, coeff);
// minimize 2*x + 3*y
// <=>
// (assret-soft (not x) 2)
// (assert-soft (not y) 3)
//
if (get_pb_sum(term, terms, weights, coeff) && coeff.is_zero()) {
// TBD: and weights are positive?
for (unsigned i = 0; i < terms.size(); ++i) {
terms[i] = m.mk_not(terms[i].get());
}
return true;
}
}
return false;
}