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fix #4116

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delta has to be computed based on Simplex tableau not on difference graph.
This commit is contained in:
Nikolaj Bjorner 2020-04-27 17:07:12 -07:00
parent 3a63c3751e
commit 4f462925a0
7 changed files with 91 additions and 21 deletions
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5
src/smt/diff_logic.h
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@ -414,6 +414,7 @@ private:
}
break;
case DL_PROCESSED:
TRACE("arith", display_edge(tout << "processed twice: ", e););
// if two edges with the same source/target occur in the graph.
break;
default:
@ -514,10 +515,8 @@ public:
// The method assumes the graph is feasible before the invocation.
bool enable_edge(edge_id id) {
edge& e = m_edges[id];
SASSERT(is_feasible());
bool r = true;
if (!is_feasible()) {
return false;
}
if (!e.is_enabled()) {
e.enable(m_timestamp);
m_last_enabled_edge = id;