diff --git a/lib/Analysis/PostDominators.cpp b/lib/Analysis/PostDominators.cpp
index 0384fad..370cd95 100644
--- a/lib/Analysis/PostDominators.cpp
+++ b/lib/Analysis/PostDominators.cpp
@@ -29,25 +29,7 @@
 F("postdomtree", "Post-Dominator Tree Construction", true);
 
 bool PostDominatorTree::runOnFunction(Function &F) {
-  reset();     // Reset from the last time we were run...
-    
-  // Initialize the roots list
-  for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I) {
-    TerminatorInst *Insn = I->getTerminator();
-    if (Insn->getNumSuccessors() == 0) {
-      // Unreachable block is not a root node.
-      if (!isa<UnreachableInst>(Insn))
-        Roots.push_back(I);
-    }
-    
-    // Prepopulate maps so that we don't get iterator invalidation issues later.
-    IDoms[I] = 0;
-    DomTreeNodes[I] = 0;
-  }
-  
-  Vertex.push_back(0);
-    
-  Calculate<Inverse<BasicBlock*>, GraphTraits<Inverse<BasicBlock*> > >(*this, F);
+  DT->recalculate(F);
   return false;
 }
 
diff --git a/lib/VMCore/Dominators.cpp b/lib/VMCore/Dominators.cpp
index b909a00..5bb25d4 100644
--- a/lib/VMCore/Dominators.cpp
+++ b/lib/VMCore/Dominators.cpp
@@ -57,17 +57,7 @@
 E("domtree", "Dominator Tree Construction", true);
 
 bool DominatorTree::runOnFunction(Function &F) {
-  reset();     // Reset from the last time we were run...
-  
-  // Initialize roots
-  Roots.push_back(&F.getEntryBlock());
-  IDoms[&F.getEntryBlock()] = 0;
-  DomTreeNodes[&F.getEntryBlock()] = 0;
-  Vertex.push_back(0);
-  
-  Calculate<BasicBlock*, GraphTraits<BasicBlock*> >(*this, F);
-  
-  updateDFSNumbers();
+  DT->recalculate(F);
   
   return false;
 }