Index: include/clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h
===================================================================
--- include/clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h
+++ include/clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h
@@ -79,6 +79,10 @@
   ConstraintManager() = default;
   virtual ~ConstraintManager();
 
+  /// Return true if the constraints are changed between two program states.
+  virtual bool isConstraintChanged(ProgramStateRef S1,
+                                   ProgramStateRef S2) const = 0;
+
   virtual ProgramStateRef assume(ProgramStateRef state,
                                  DefinedSVal Cond,
                                  bool Assumption) = 0;
Index: include/clang/StaticAnalyzer/Core/PathSensitive/SMTConstraintManager.h
===================================================================
--- include/clang/StaticAnalyzer/Core/PathSensitive/SMTConstraintManager.h
+++ include/clang/StaticAnalyzer/Core/PathSensitive/SMTConstraintManager.h
@@ -217,6 +217,11 @@
     OS << nl;
   }
 
+  bool isConstraintChanged(ProgramStateRef S1,
+                           ProgramStateRef S2) const override {
+    return S1->get<ConstraintSMT>() != S2->get<ConstraintSMT>();
+  }
+
   bool canReasonAbout(SVal X) const override {
     const TargetInfo &TI = getBasicVals().getContext().getTargetInfo();
 
Index: lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
===================================================================
--- lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
+++ lib/StaticAnalyzer/Core/BugReporterVisitors.cpp
@@ -1789,13 +1789,11 @@
                                   BugReporterContext &BRC, BugReport &BR) {
   ProgramPoint progPoint = N->getLocation();
   ProgramStateRef CurrentState = N->getState();
-  ProgramStateRef PrevState = N->getFirstPred()->getState();
+  ProgramStateRef PreviousState = N->getFirstPred()->getState();
 
-  // Compare the GDMs of the state, because that is where constraints
-  // are managed.  Note that ensure that we only look at nodes that
-  // were generated by the analyzer engine proper, not checkers.
-  if (CurrentState->getGDM().getRoot() ==
-      PrevState->getGDM().getRoot())
+  // If the constraint information does not changed there is no assumption.
+  if (!BRC.getStateManager().getConstraintManager().isConstraintChanged(
+          CurrentState, PreviousState))
     return nullptr;
 
   // If an assumption was made on a branch, it should be caught
Index: lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
===================================================================
--- lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
+++ lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
@@ -230,6 +230,11 @@
   // Implementation for interface from ConstraintManager.
   //===------------------------------------------------------------------===//
 
+  bool isConstraintChanged(ProgramStateRef S1,
+                           ProgramStateRef S2) const override {
+    return S1->get<ConstraintRange>() != S2->get<ConstraintRange>();
+  }
+
   bool canReasonAbout(SVal X) const override;
 
   ConditionTruthVal checkNull(ProgramStateRef State, SymbolRef Sym) override;