Allocation folding integrated into the GVN phase.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 6c1aba5db66d709231b996207965af7146b758e9..661d8ac30e3934ea07a863d094abb5224abeed3c 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -233,14 +233,21 @@ class HPredecessorIterator BASE_EMBEDDED {
 
 class HInstructionIterator BASE_EMBEDDED {
  public:
-  explicit HInstructionIterator(HBasicBlock* block) : instr_(block->first()) { }
+  explicit HInstructionIterator(HBasicBlock* block)
+      : instr_(block->first()) {
+    next_ = Done() ? NULL : instr_->next();
+  }
 
   bool Done() { return instr_ == NULL; }

[titzer, 2013/07/09 08:34:39]

While you're here, would you mind adding "inline" and "const" keywords?

[Hannes Payer (out of office), 2013/07/09 09:01:33]

Done.

   HInstruction* Current() { return instr_; }
-  void Advance() { instr_ = instr_->next(); }
+  void Advance() {
+    instr_ = next_;
+    next_ = Done() ? NULL : instr_->next();
+  }
 
  private:
   HInstruction* instr_;
+  HInstruction* next_;
 };