Eliminate write barrier for global stores at compile time if value stored is a smi.

src/hydrogen-instructions.cc

 // Copyright 2011 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 1728 matching lines @@
 HType HDeleteProperty::CalculateInferredType() {
   return HType::Boolean();
 }
 
 
 HType HInstanceOfKnownGlobal::CalculateInferredType() {
   return HType::Boolean();
 }
 
 
+HType HChange::CalculateInferredType() {
+  if (from().IsDouble() && to().IsTagged()) return HType::HeapNumber();
+  return type();
+}
+
+
 HType HBitwiseBinaryOperation::CalculateInferredType() {
   return HType::TaggedNumber();
 }
 
 
 HType HArithmeticBinaryOperation::CalculateInferredType() {
   return HType::TaggedNumber();
 }
 
 
@@ skipping 35 matching lines @@
 HType HShr::CalculateInferredType() {
   return HType::TaggedNumber();
 }
 
 
 HType HSar::CalculateInferredType() {
   return HType::TaggedNumber();
 }
 
 
+HType HStringCharFromCode::CalculateInferredType() {
+  return HType::String();
+}
+
+
+HType HArrayLiteral::CalculateInferredType() {
+  return HType::JSArray();
+}
+
+
+HType HObjectLiteral::CalculateInferredType() {
+  return HType::JSObject();
+}
+
+
+HType HRegExpLiteral::CalculateInferredType() {
+  return HType::JSObject();
+}
+
+
+HType HFunctionLiteral::CalculateInferredType() {
+  return HType::JSObject();
+}
+
+
 HValue* HUnaryMathOperation::EnsureAndPropagateNotMinusZero(
     BitVector* visited) {
   visited->Add(id());
   if (representation().IsInteger32() &&
       !value()->representation().IsInteger32()) {
     if (value()->range() == NULL || value()->range()->CanBeMinusZero()) {
       SetFlag(kBailoutOnMinusZero);
     }
   }
   if (RequiredInputRepresentation(0).IsInteger32() &&
@@ skipping 121 matching lines @@
 
 
 void HCheckPrototypeMaps::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());
 }
 
 #endif
 
 } }  // namespace v8::internal