New class for Date objects: caches individual date components.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index a594c6628eb7b075e30e979f8ea903e8fc40d323..5ba7154e51ab56a3d8a2f57030421819a74be0d0 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -1279,6 +1279,25 @@ void LCodeGen::DoValueOf(LValueOf* instr) {
 }
 
 
+void LCodeGen::DoDateField(LDateField* instr) {
+  Register input = ToRegister(instr->InputAt(0));
+  Register result = ToRegister(instr->result());
+  Register map = ToRegister(instr->TempAt(0));
+  ASSERT(input.is(result));
+  Label done;
+  // If the object is a smi return the object.
+  __ JumpIfSmi(input, &done, Label::kNear);

[ulan, 2012/01/25 13:08:48]

See comments in full-codegen-ia32.cc

[rossberg, 2012/01/25 15:48:37]

Done.

+
+  // If the object is not a value type, return the object.
+  __ CmpObjectType(input, JS_DATE_TYPE, map);
+  __ j(not_equal, &done, Label::kNear);
+  __ mov(result,
+      FieldOperand(input, JSDate::kYearOffset + kPointerSize * instr->index()));
+
+  __ bind(&done);
+}
+
+
 void LCodeGen::DoBitNotI(LBitNotI* instr) {
   LOperand* input = instr->InputAt(0);
   ASSERT(input->Equals(instr->result()));