diff options
Diffstat (limited to 'src/omt/integer_optimizer.cpp')
| -rw-r--r-- | src/omt/integer_optimizer.cpp | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/src/omt/integer_optimizer.cpp b/src/omt/integer_optimizer.cpp index 045268337..379b0cd43 100644 --- a/src/omt/integer_optimizer.cpp +++ b/src/omt/integer_optimizer.cpp @@ -33,13 +33,10 @@ OptimizationResult OMTOptimizerInteger::optimize(SmtEngine* optChecker, Result intermediateSatResult = optChecker->checkSat(); // Model-value of objective (used in optimization loop) Node value; - if (intermediateSatResult.isUnknown()) + if (intermediateSatResult.isUnknown() + || intermediateSatResult.isSat() == Result::UNSAT) { - return OptimizationResult(OptimizationResult::UNKNOWN, value); - } - if (intermediateSatResult.isSat() == Result::UNSAT) - { - return OptimizationResult(OptimizationResult::UNSAT, value); + return OptimizationResult(intermediateSatResult, value); } // node storing target > old_value (used in optimization loop) Node increment; @@ -56,12 +53,14 @@ OptimizationResult OMTOptimizerInteger::optimize(SmtEngine* optChecker, // then assert optimization_target > current_model_value incrementalOperator = kind::GT; } + Result lastSatResult = intermediateSatResult; // Workhorse of linear search: // This loop will keep incrmenting/decrementing the objective until unsat // When unsat is hit, // the optimized value is the model value just before the unsat call while (intermediateSatResult.isSat() == Result::SAT) { + lastSatResult = intermediateSatResult; value = optChecker->getValue(target); Assert(!value.isNull()); increment = nm->mkNode(incrementalOperator, target, value); @@ -69,7 +68,7 @@ OptimizationResult OMTOptimizerInteger::optimize(SmtEngine* optChecker, intermediateSatResult = optChecker->checkSat(); } optChecker->pop(); - return OptimizationResult(OptimizationResult::OPTIMAL, value); + return OptimizationResult(lastSatResult, value); } OptimizationResult OMTOptimizerInteger::minimize(SmtEngine* optChecker, |