Support Int32 representation for selected binary operations.

runtime/vm/locations.h

 // Copyright (c) 2013, 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_LOCATIONS_H_
 #define VM_LOCATIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/bitfield.h"
 
 namespace dart {
 
 class BufferFormatter;
 class Value;
 class PairLocation;
+class ConstantInstr;
 
 
 enum Representation {
   kNoRepresentation,
   kTagged,
   kUntagged,
   kUnboxedDouble,
+  kUnboxedInt32,
   kUnboxedUint32,
   kUnboxedMint,
   kUnboxedFloat32x4,
   kUnboxedInt32x4,
   kUnboxedFloat64x2,
   kPairOfTagged,
   kPairOfUnboxedDouble,
   kNumRepresentations
 };
 
@@ skipping 102 matching lines @@
 
   bool IsInvalid() const {
     return value_ == kInvalidLocation;
   }
 
   // Constants.
   bool IsConstant() const {
     return (value_ & kLocationTagMask) == kConstantTag;
   }
 
-  static Location Constant(const Object& obj) {
-    Location loc(reinterpret_cast<uword>(&obj) | kConstantTag);
-    ASSERT(&obj == &loc.constant());
+  static Location Constant(ConstantInstr* obj) {
+    Location loc(reinterpret_cast<uword>(obj) | kConstantTag);
+    ASSERT(obj == loc.constant_instruction());
     return loc;
   }
 
-  const Object& constant() const {
+  ConstantInstr* constant_instruction() const {
     ASSERT(IsConstant());
-    return *reinterpret_cast<const Object*>(value_ & ~kLocationTagMask);
+    return reinterpret_cast<ConstantInstr*>(value_ & ~kLocationTagMask);
   }
 
+  const Object& constant() const;
+
   bool IsPairLocation() const {
     return (value_ & kLocationTagMask) == kPairLocationTag;
   }
 
   static Location Pair(Location first, Location second);
 
   PairLocation* AsPairLocation() const;
 
   // Unallocated locations.
   enum Policy {
@@ skipping 470 matching lines @@
   BitmapBuilder* stack_bitmap_;
 
   const ContainsCall contains_call_;
   RegisterSet live_registers_;
 };
 
 
 }  // namespace dart
 
 #endif  // VM_LOCATIONS_H_