Implement ai_simplify for the constant domain.

Author: Martin Brain

src/analyses/constant_propagator.cpp

@@ -333,6 +333,29 @@ void constant_propagator_domaint::assign(
 
 /*******************************************************************\
 
+Function: constant_propagator_domaint::ai_simplify
+
+  Inputs: The condition to simplify and its namespace.
+
+ Outputs: The simplified condition.
+
+ Purpose: Simplify the condition given context-sensitive knowledge
+          from the abstract state.
+
+\*******************************************************************/
+
+bool constant_propagator_domaint::ai_simplify(
+  exprt &condition,
+  const namespacet &ns) const
+{
+  bool b=values.replace_const.replace(condition);
+  b&=simplify(condition, ns);
+
+  return b;
+}
+
+/*******************************************************************\
+
 Function: constant_propagator_domaint::is_array_constant
 
   Inputs:

src/analyses/constant_propagator.h

@@ -30,6 +30,10 @@ class constant_propagator_domaint:public ai_domain_baset
   void make_entry() final { values.set_to_top(); }
   bool merge(const constant_propagator_domaint &, locationt, locationt);
 
+  virtual bool ai_simplify(
+    exprt &condition,
+    const namespacet &ns) const override;
+
   struct valuest
   {
   public: