[analyzer] Minor optimization: avoid setting state if unchanged

Summary: Split out optimization from D26061

Reviewers: zaks.anna, dcoughlin

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D26642

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@286925 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp b/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
index 4c98f2544b9b68f7c9e5d83116768c2069e64b91..a312350a7f3f4e9a28e5d7c64664fab049caaf8d 100644 (file)
--- a/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
+++ b/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp
@@ -398,17 +398,19 @@ ConditionTruthVal RangeConstraintManager::checkNull(ProgramStateRef State,
 ProgramStateRef
 RangeConstraintManager::removeDeadBindings(ProgramStateRef state,
                                            SymbolReaper& SymReaper) {
-
+  bool Changed = false;
   ConstraintRangeTy CR = state->get<ConstraintRange>();
-  ConstraintRangeTy::Factory& CRFactory = state->get_context<ConstraintRange>();
+  ConstraintRangeTy::Factory &CRFactory = state->get_context<ConstraintRange>();
 
   for (ConstraintRangeTy::iterator I = CR.begin(), E = CR.end(); I != E; ++I) {
     SymbolRef sym = I.getKey();
-    if (SymReaper.maybeDead(sym))
+    if (SymReaper.maybeDead(sym)) {
+      Changed = true;
       CR = CRFactory.remove(CR, sym);
+    }
   }
 
-  return state->set<ConstraintRange>(CR);
+  return Changed ? state->set<ConstraintRange>(CR) : state;
 }
 
 RangeSet