lpp: only read solution in gurobi solver if one was found

diff --git a/ir/lpp/lpp_gurobi.c b/ir/lpp/lpp_gurobi.c
index 6c215db..c329e7c 100644 (file)
--- a/ir/lpp/lpp_gurobi.c
+++ b/ir/lpp/lpp_gurobi.c
@@ -223,20 +223,24 @@ static void gurobi_solve(gurobi_t *grb)
        default:                    lpp->sol_state = lpp_feasible; break;
        }
 
-       /* get variable solution values */
-       values = alloca(numcols * sizeof(*values));
-       error = GRBgetdblattrarray(grb->model, GRB_DBL_ATTR_X, 0, numcols, values);
-       check_gurobi_error(grb, error);
-       for(i=0; i<numcols; ++i) {
-               lpp->vars[1+i]->value      = values[i];
-               lpp->vars[1+i]->value_kind = lpp_value_solution;
-       }
+       if (lpp->sol_state >= lpp_feasible) {
+               /* get variable solution values */
+               values = alloca(numcols * sizeof(*values));
+               error = GRBgetdblattrarray(grb->model, GRB_DBL_ATTR_X, 0, numcols,
+                                          values);
+               check_gurobi_error(grb, error);
+               for(i=0; i<numcols; ++i) {
+                       lpp->vars[1+i]->value      = values[i];
+                       lpp->vars[1+i]->value_kind = lpp_value_solution;
+               }
 
-       /* Get the value of the objective function. */
-       error = GRBgetdblattr(grb->model, GRB_DBL_ATTR_OBJVAL, &lpp->objval);
-       check_gurobi_error(grb, error);
-       error = GRBgetdblattr(grb->model , GRB_DBL_ATTR_OBJBOUND, &lpp->best_bound);
-       check_gurobi_error(grb, error);
+               /* Get the value of the objective function. */
+               error = GRBgetdblattr(grb->model, GRB_DBL_ATTR_OBJVAL, &lpp->objval);
+               check_gurobi_error(grb, error);
+               error = GRBgetdblattr(grb->model , GRB_DBL_ATTR_OBJBOUND,
+                                     &lpp->best_bound);
+               check_gurobi_error(grb, error);
+       }
 
        /* get some statistics */
        error = GRBgetdblattr(grb->model, GRB_DBL_ATTR_ITERCOUNT, &iterations);