diff --git a/lib/Analysis/DataStructure/BottomUpClosure.cpp b/lib/Analysis/DataStructure/BottomUpClosure.cpp
index 91cfc7c..7ab7d80 100644
--- a/lib/Analysis/DataStructure/BottomUpClosure.cpp
+++ b/lib/Analysis/DataStructure/BottomUpClosure.cpp
@@ -305,6 +305,13 @@
 
     CalledFuncs.clear();
 
+    // Fast path for noop calls.  Note that we don't care about merging globals
+    // in the callee with nodes in the caller here.
+    if (CS.getRetVal().isNull() && CS.getNumPtrArgs() == 0) {
+      TempFCs.erase(TempFCs.begin());
+      continue;
+    }
+
     if (CS.isDirectCall()) {
       Function *F = CS.getCalleeFunc();
       if (isResolvableFunc(F))
diff --git a/lib/Analysis/DataStructure/CompleteBottomUp.cpp b/lib/Analysis/DataStructure/CompleteBottomUp.cpp
index 5a0436c..a70080a 100644
--- a/lib/Analysis/DataStructure/CompleteBottomUp.cpp
+++ b/lib/Analysis/DataStructure/CompleteBottomUp.cpp
@@ -217,7 +217,11 @@
 
     assert(calls.insert(TheCall).second &&
            "Call instruction occurs multiple times in graph??");
-      
+    
+    // Fast path for noop calls.  Note that we don't care about merging globals
+    // in the callee with nodes in the caller here.
+    if (CS.getRetVal().isNull() && CS.getNumPtrArgs() == 0)
+      continue;
 
     // Loop over all of the potentially called functions...
     // Inline direct calls as well as indirect calls because the direct
diff --git a/lib/Analysis/DataStructure/EquivClassGraphs.cpp b/lib/Analysis/DataStructure/EquivClassGraphs.cpp
index ef78d66..c1789ef 100644
--- a/lib/Analysis/DataStructure/EquivClassGraphs.cpp
+++ b/lib/Analysis/DataStructure/EquivClassGraphs.cpp
@@ -406,6 +406,9 @@
     assert(calls.insert(TheCall).second &&
            "Call instruction occurs multiple times in graph??");
     
+    if (CS.getRetVal().isNull() && CS.getNumPtrArgs() == 0)
+      continue;
+
     // Inline the common callee graph into the current graph, if the callee
     // graph has not changed.  Note that all callees should have the same
     // graph so we only need to do this once.