Undo previous check-in.

Reintroduce recursive assignDFSNumber().

llvm-svn: 30380

2 files changed, 10 insertions, 34 deletions

diff --git a/llvm/include/llvm/Analysis/ET-Forest.h b/llvm/include/llvm/Analysis/ET-Forest.h
index ef2b2155c72..b05776a9e0f 100644
--- a/llvm/include/llvm/Analysis/ET-Forest.h
+++ b/llvm/include/llvm/Analysis/ET-Forest.h
@@ -250,7 +250,16 @@ public:
     return this->Below(other);
   }
 
-  void assignDFSNumber(int &);
+  void assignDFSNumber(int &num) {
+    DFSNumIn = num++;
+    
+    if (Son) {
+      Son->assignDFSNumber(num);
+      for (ETNode *son = Son->Right; son != Son; son = son->Right)
+        son->assignDFSNumber(num);
+    }
+    DFSNumOut = num++;
+  }
   
   bool hasFather() const {
     return Father != NULL;
diff --git a/llvm/lib/VMCore/Dominators.cpp b/llvm/lib/VMCore/Dominators.cpp
index fd193b8d7aa..9f7e5d9365d 100644
--- a/llvm/lib/VMCore/Dominators.cpp
+++ b/llvm/lib/VMCore/Dominators.cpp
@@ -890,39 +890,6 @@ void ETForest::calculate(const ImmediateDominators &ID) {
   updateDFSNumbers ();
 }
 
-// Walk ETNode and its children using DFS algorithm and assign
-// DFSNumIn and DFSNumOut numbers for each node. 
-void ETNode::assignDFSNumber(int &num) {
-
-    std::vector<ETNode *> DFSInStack;
-    std::set<ETNode *> visited;
-
-    DFSInStack.push_back(this);
-
-    visited.insert(this);
-
-    while(!DFSInStack.empty()) {
-      ETNode *Parent = DFSInStack.back();
-      DFSInStack.pop_back();
-      Parent->DFSNumIn = num++;
-      Parent->DFSNumOut = Parent->DFSNumIn + 1;
-
-      ETNode *son = Parent->Son;
-      if (son && visited.count(son) == 0) {
-
-        DFSInStack.push_back(son);
-        son->DFSNumIn = Parent->DFSNumIn + 1;
-        visited.insert(son);
-        
-        for (ETNode *s = son->Right; s != son; s = s->Right) {
-          DFSInStack.push_back(s);
-          s->DFSNumIn = Parent->DFSNumIn + 1;
-          visited.insert(s);
-        }
-      }
-    }
-}
-
 //===----------------------------------------------------------------------===//
 // ETForestBase Implementation
 //===----------------------------------------------------------------------===//