Introduce number type information in the virtual frame.

src/register-allocator.cc

Index: src/register-allocator.cc
===================================================================
--- src/register-allocator.cc	(revision 3859)
+++ src/register-allocator.cc	(working copy)
@@ -37,10 +37,12 @@
 // Result implementation.
 
 
-Result::Result(Register reg) {
+Result::Result(Register reg, NumberInfo::Type info) {
   ASSERT(reg.is_valid() && !RegisterAllocator::IsReserved(reg));
   CodeGeneratorScope::Current()->allocator()->Use(reg);
-  value_ = TypeField::encode(REGISTER) | DataField::encode(reg.code_);
+  value_ = TypeField::encode(REGISTER)
+      | NumberInfoField::encode(info)
+      | DataField::encode(reg.code_);
 }
 
 
@@ -50,6 +52,23 @@
 }
 
 
+NumberInfo::Type Result::number_info() {
+  ASSERT(is_valid());
+  if (!is_constant()) return NumberInfoField::decode(value_);
+  Handle<Object> value = handle();
+  if (value->IsSmi()) return NumberInfo::kSmi;
+  if (value->IsHeapNumber()) return NumberInfo::kHeapNumber;
+  return NumberInfo::kUnknown;
+}
+
+
+void Result::set_number_info(NumberInfo::Type info) {
+  ASSERT(is_valid());
+  value_ = value_ & ~NumberInfoField::mask();
+  value_ = value_ | NumberInfoField::encode(info);
+}
+
+
 // -------------------------------------------------------------------------
 // RegisterAllocator implementation.