Start porting fast typechecks to x64.

runtime/vm/intermediate_language.cc

 // 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.
 
 #include "vm/intermediate_language.h"
 
 #include "vm/bit_vector.h"
 #include "vm/object.h"
 #include "vm/os.h"
 #include "vm/scopes.h"
@@ skipping 28 matching lines @@
     Instruction* current = block_order_[i]->Accept(this);
     while ((current != NULL) && !current->IsBlockEntry()) {
       current = current->Accept(this);
     }
   }
 }
 
 
 // ==== Per-instruction input counts.
 intptr_t AssertAssignableComp::InputCount() const {
-  // Value and optional instantiator type arguments.
-  return (instantiator_type_arguments() == NULL) ? 1 : 2;
+  // Value and optional instantiator and instantiator type arguments.
+  intptr_t count = 1;
+  if (instantiator() != NULL) count++;
+  if (instantiator_type_arguments() != NULL) count++;
+  return count;
 }
 
 
 intptr_t InstanceOfComp::InputCount() const {
-  // Value and optional type_arguments.
-  return (type_arguments() == NULL) ? 1 : 2;
+  // Value and optional instantiator and instantiator type_arguments.
+  intptr_t count = 1;
+  if (instantiator() != NULL) count++;
+  if (type_arguments() != NULL) count++;
+  return count;
 }
 
 
 intptr_t CreateClosureComp::InputCount() const {
   // Optional type arguments.
   return (type_arguments() == NULL) ? 0 : 1;
 }
 
 
 intptr_t InstanceCallComp::InputCount() const {
@@ skipping 474 matching lines @@
 }
 
 
 RawAbstractType* CatchEntryComp::StaticType() const {
   UNREACHABLE();
   return AbstractType::null();
 }
 
 
 }  // namespace dart