Abcd for performance check.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 0d5f5c9cfd9ae9b7befa09888acb2661e1dedd8b..1926784e2a31e76af3f350549fd0b83219f95cb4 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -69,6 +69,11 @@ class HBasicBlock: public ZoneObject {
   HInstruction* GetLastInstruction();
   HControlInstruction* end() const { return end_; }
   HLoopInformation* loop_information() const { return loop_information_; }
+  HLoopInformation* current_loop() const {
+    return IsLoopHeader() ? loop_information()
+                          : (parent_loop_header() != NULL
+                            ? parent_loop_header()->loop_information() : NULL);
+  }
   const ZoneList<HBasicBlock*>* predecessors() const { return &predecessors_; }
   bool HasPredecessor() const { return predecessors_.length() > 0; }
   const ZoneList<HBasicBlock*>* dominated_blocks() const {
@@ -221,7 +226,8 @@ class HLoopInformation: public ZoneObject {
       : back_edges_(4, zone),
         loop_header_(loop_header),
         blocks_(8, zone),
-        stack_check_(NULL) {
+        stack_check_(NULL),
+        exits_count_(0) {
     blocks_.Add(loop_header, zone);
   }
   virtual ~HLoopInformation() {}
@@ -237,6 +243,23 @@ class HLoopInformation: public ZoneObject {
     stack_check_ = stack_check;
   }
 
+  int exits_count() { return exits_count_; }
+  HLoopInformation* parent_loop() {
+    HBasicBlock* parent_header = loop_header()->parent_loop_header();
+    return parent_header != NULL ? parent_header->loop_information() : NULL;
+  }
+  bool IsInThisLoop(HLoopInformation* other) {

[Jakob Kummerow, 2013/04/17 11:34:15]

I'd rename this to IsNestedInThisLoop (or just IsNested).

[Massi, 2013/05/07 11:32:03]

Done.

+    while (other != NULL) {
+      if (other == this) {
+        return true;
+      }
+      other = other->parent_loop();
+    }
+    return false;
+  }
+  void ProcessEdge(HBasicBlock* destination);
+  void ProcessThrow();
+
  private:
   void AddBlock(HBasicBlock* block);
 
@@ -244,6 +267,7 @@ class HLoopInformation: public ZoneObject {
   HBasicBlock* loop_header_;
   ZoneList<HBasicBlock*> blocks_;
   HStackCheck* stack_check_;
+  int exits_count_;
 };
 
 class BoundsCheckTable;