Add signed/unsigned 8-bit and 16-bit Representations

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5836 matching lines @@
     return HObjectAccess(kInobject, JSFunction::kContextOffset);
   }
 
   static HObjectAccess ForMap() {
     return HObjectAccess(kMaps, JSObject::kMapOffset);
   }
 
   static HObjectAccess ForMapInstanceSize() {
     return HObjectAccess(kInobject,
                          Map::kInstanceSizeOffset,
-                         Representation::Byte());
+                         Representation::UInteger8());
   }
 
   static HObjectAccess ForPropertyCellValue() {
     return HObjectAccess(kInobject, PropertyCell::kValueOffset);
   }
 
   static HObjectAccess ForCellValue() {
     return HObjectAccess(kInobject, Cell::kValueOffset);
   }
 
@@ skipping 57 matching lines @@
              RepresentationField::encode(representation.kind()) |
              OffsetField::encode(offset)),
       name_(name) {
     // assert that the fields decode correctly
     ASSERT(this->offset() == offset);
     ASSERT(this->portion() == portion);
     ASSERT(RepresentationField::decode(value_) == representation.kind());
   }
 
   class PortionField : public BitField<Portion, 0, 3> {};
-  class RepresentationField : public BitField<Representation::Kind, 3, 3> {};
-  class OffsetField : public BitField<int, 6, 26> {};
+  class RepresentationField : public BitField<Representation::Kind, 3, 4> {};
+  class OffsetField : public BitField<int, 7, 25> {};
 
   uint32_t value_;  // encodes portion, representation, and offset
   Handle<String> name_;
 
   friend class HLoadNamedField;
   friend class HStoreNamedField;
 
   inline Portion portion() const {
     return PortionField::decode(value_);
   }
@@ skipping 32 matching lines @@
     HLoadNamedField* b = HLoadNamedField::cast(other);
     return access_.Equals(b->access_);
   }
 
  private:
   HLoadNamedField(HValue* object, HObjectAccess access) : access_(access) {
     ASSERT(object != NULL);
     SetOperandAt(0, object);
 
     Representation representation = access.representation();
-    if (representation.IsByte()) {
+    if (representation.IsInteger8() ||
+        representation.IsUInteger8() ||
+        representation.IsInteger16() ||
+        representation.IsUInteger16()) {
       set_representation(Representation::Integer32());
     } else if (representation.IsSmi()) {
       set_type(HType::Smi());
       set_representation(representation);
     } else if (representation.IsDouble() ||
                representation.IsExternal() ||
                representation.IsInteger32()) {
       set_representation(representation);
     } else if (FLAG_track_heap_object_fields &&
                representation.IsHeapObject()) {
@@ skipping 289 matching lines @@
     return index == 1;
   }
   virtual bool HasOutOfBoundsAccess(int size) V8_OVERRIDE {
     return !access().IsInobject() || access().offset() >= size;
   }
   virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
     if (index == 0 && access().IsExternalMemory()) {
       // object must be external in case of external memory access
       return Representation::External();
     } else if (index == 1) {
-      if (field_representation().IsByte() ||
+      if (field_representation().IsInteger8() ||
+          field_representation().IsUInteger8() ||
+          field_representation().IsInteger16() ||
+          field_representation().IsUInteger16() ||
           field_representation().IsInteger32()) {
         return Representation::Integer32();
       } else if (field_representation().IsDouble() ||
                  field_representation().IsSmi()) {
         return field_representation();
       }
     }
     return Representation::Tagged();
   }
   virtual void HandleSideEffectDominator(GVNFlag side_effect,
@@ skipping 880 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_