From 72130ac7b9c2d2cb5bfa69500fc064b43bccf971 Mon Sep 17 00:00:00 2001
From: Nikolaj Bjorner <nbjorner@microsoft.com>
Date: Wed, 18 Dec 2013 05:49:43 +0200
Subject: [PATCH] fix lower bound update

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
---
 src/opt/opt_context.cpp | 4 ++++
 src/opt/optsmt.cpp      | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/opt/opt_context.cpp b/src/opt/opt_context.cpp
index 26ce2152b..599b6d7d2 100644
--- a/src/opt/opt_context.cpp
+++ b/src/opt/opt_context.cpp
@@ -424,6 +424,10 @@ namespace opt {
             objective const& obj = m_objectives[i];
             switch(obj.m_type) {
             case O_MINIMIZE:
+                if (m_model->eval(obj.m_term, val) && a.is_numeral(val, r)) {
+                    m_optsmt.update_lower(obj.m_index, -r);
+                }
+                break;
             case O_MAXIMIZE:
                 if (m_model->eval(obj.m_term, val) && a.is_numeral(val, r)) {
                     m_optsmt.update_lower(obj.m_index, r);
diff --git a/src/opt/optsmt.cpp b/src/opt/optsmt.cpp
index 97aec1e8c..19ea39521 100644
--- a/src/opt/optsmt.cpp
+++ b/src/opt/optsmt.cpp
@@ -117,6 +117,7 @@ namespace opt {
 
     void optsmt::update_lower(unsigned idx, rational const& r) {
         inf_eps v(r);
+        std::cout << "update lower: " << r << "\n";
         if (m_lower[idx] < v) {
             m_lower[idx] = v;
             if (m_s) m_s->get_model(m_model);
@@ -322,7 +323,6 @@ namespace opt {
 
     std::ostream& optsmt::display_objective(std::ostream& out, unsigned i) const {
         bool is_max = m_is_max[i];
-        inf_eps val = get_lower(i);
         expr_ref obj(m_objs[i], m);
         if (!is_max) {
             arith_util a(m);