Revert of [builtins] Refactor the remaining Date builtins.

src/full-codegen/x64/full-codegen-x64.cc

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index 2fdd482b30b4dc5161c5c563b5c662a45df7278f..fb1c30b7b026bacb0b6a0f277fdbb30d42b7e699 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -3295,6 +3295,49 @@
   Split(equal, if_true, if_false, fall_through);
 
   context()->Plug(if_true, if_false);
+}
+
+
+void FullCodeGenerator::EmitDateField(CallRuntime* expr) {
+  ZoneList<Expression*>* args = expr->arguments();
+  DCHECK(args->length() == 2);
+  DCHECK_NOT_NULL(args->at(1)->AsLiteral());
+  Smi* index = Smi::cast(*(args->at(1)->AsLiteral()->value()));
+
+  VisitForAccumulatorValue(args->at(0));  // Load the object.
+
+  Register object = rax;
+  Register result = rax;
+  Register scratch = rcx;
+
+  if (FLAG_debug_code) {
+    __ AssertNotSmi(object);
+    __ CmpObjectType(object, JS_DATE_TYPE, scratch);
+    __ Check(equal, kOperandIsNotADate);
+  }
+
+  if (index->value() == 0) {
+    __ movp(result, FieldOperand(object, JSDate::kValueOffset));
+  } else {
+    Label runtime, done;
+    if (index->value() < JSDate::kFirstUncachedField) {
+      __ Load(scratch, ExternalReference::date_cache_stamp(isolate()));
+      __ cmpp(scratch, FieldOperand(object, JSDate::kCacheStampOffset));
+      __ j(not_equal, &runtime, Label::kNear);
+      __ movp(result, FieldOperand(object, JSDate::kValueOffset +
+                                           kPointerSize * index->value()));
+      __ jmp(&done, Label::kNear);
+    }
+    __ bind(&runtime);
+    __ PrepareCallCFunction(2);
+    __ movp(arg_reg_1, object);
+    __ Move(arg_reg_2, index, Assembler::RelocInfoNone());
+    __ CallCFunction(ExternalReference::get_date_field_function(isolate()), 2);
+    __ movp(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
+    __ bind(&done);
+  }
+
+  context()->Plug(rax);
 }