Implement HChange support for Smis and use it in Load/StoreNameField

src/hydrogen-instructions.cc

 // 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 1669 matching lines @@
     result = new(zone) Range();
     result->set_can_be_minus_zero(!representation().IsInteger32());
   }
   return result;
 }
 
 
 Range* HChange::InferRange(Zone* zone) {
   Range* input_range = value()->range();
   if (from().IsInteger32() &&
-      to().IsTagged() &&
+      to().IsSmiOrTagged() &&
       !value()->CheckFlag(HInstruction::kUint32) &&
       input_range != NULL && input_range->IsInSmiRange()) {
     set_type(HType::Smi());
     ClearGVNFlag(kChangesNewSpacePromotion);
   }
   Range* result = (input_range != NULL)
       ? input_range->Copy(zone)
       : HValue::InferRange(zone);
   if (to().IsInteger32()) result->set_can_be_minus_zero(false);
   return result;
@@ skipping 1855 matching lines @@
 
 Representation HPhi::RepresentationFromInputs() {
   bool double_occurred = false;
   bool int32_occurred = false;
   for (int i = 0; i < OperandCount(); ++i) {
     HValue* value = OperandAt(i);
     if (value->IsUnknownOSRValue()) {
       HPhi* hint_value = HUnknownOSRValue::cast(value)->incoming_value();
       if (hint_value != NULL) {
         Representation hint = hint_value->representation();
-        if (hint.IsTagged()) return hint;
+        if (hint.IsSmiOrTagged()) return hint;
         if (hint.IsDouble()) double_occurred = true;
         if (hint.IsInteger32()) int32_occurred = true;
       }
       continue;
     }
     if (value->representation().IsDouble()) double_occurred = true;
     if (value->representation().IsInteger32()) int32_occurred = true;
-    if (value->representation().IsTagged()) {
+    if (value->representation().IsSmiOrTagged()) {
       if (value->IsConstant()) {
         HConstant* constant = HConstant::cast(value);
         if (constant->IsConvertibleToInteger()) {
           int32_occurred = true;
         } else if (constant->HasNumberValue()) {
           double_occurred = true;
         } else {
           return Representation::Tagged();
         }
       } else {
@@ skipping 77 matching lines @@
 
 
 void HCheckFunction::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());
 }
 
 #endif
 
 } }  // namespace v8::internal