Eliminate condition type check when possible.

runtime/vm/intermediate_language.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 436 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(AssertAssignableComp);
 };
 
 
 class AssertBooleanComp : public TemplateComputation<1> {
  public:
   AssertBooleanComp(intptr_t token_pos,
                     intptr_t try_index,
                     Value* value)
       : token_pos_(token_pos),
-        try_index_(try_index) {
+        try_index_(try_index),
+        eliminated_(false) {
     ASSERT(value != NULL);
     inputs_[0] = value;
   }
 
   DECLARE_COMPUTATION(AssertBoolean)
 
   intptr_t token_pos() const { return token_pos_; }
   intptr_t try_index() const { return try_index_; }
   Value* value() const { return inputs_[0]; }
 
+  bool IsEliminated() const {

[srdjan, 2012/08/13 22:14:18]

s/IsEliminated/is_eliminated_.

[regis, 2012/08/13 22:23:49]

Done.

+    return eliminated_;
+  }
+  void Eliminate() {

[srdjan, 2012/08/13 22:14:18]

s/Eliminate/eliminate/

[regis, 2012/08/13 22:23:49]

Done.

+    ASSERT(!eliminated_);
+    eliminated_ = true;
+  }
+
+  virtual void PrintOperandsTo(BufferFormatter* f) const;
+
   virtual bool CanDeoptimize() const { return false; }
 
  private:
   const intptr_t token_pos_;
   const intptr_t try_index_;
+  bool eliminated_;

[srdjan, 2012/08/13 22:14:18]

s/eliminated_/is_eleminated_/

[regis, 2012/08/13 22:23:49]

Done.

 
   DISALLOW_COPY_AND_ASSIGN(AssertBooleanComp);
 };
 
 
 // Denotes the current context, normally held in a register.  This is
 // a computation, not a value, because it's mutable.
 class CurrentContextComp : public TemplateComputation<0> {
  public:
   CurrentContextComp() { }
@@ skipping 2410 matching lines @@
   const GrowableArray<BlockEntryInstr*>& block_order_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_