Intrinsic version of Object.runtimeType

runtime/vm/intrinsifier_arm64.cc

Index: runtime/vm/intrinsifier_arm64.cc
diff --git a/runtime/vm/intrinsifier_arm64.cc b/runtime/vm/intrinsifier_arm64.cc
index fedbe17236dfc543157c04634e21194abae71a56..92b65799dc43bc2a4d676bdf467367921b20217f 100644
--- a/runtime/vm/intrinsifier_arm64.cc
+++ b/runtime/vm/intrinsifier_arm64.cc
@@ -1646,6 +1646,30 @@ void Intrinsifier::ObjectEquals(Assembler* assembler) {
 }
 
 
+// Return type quickly for simple types (not parameterized and not signature).
+void Intrinsifier::ObjectRuntimeType(Assembler* assembler) {
+  Label fall_through;
+  __ ldr(R0, Address(SP, 0 * kWordSize));
+  __ LoadClassIdMayBeSmi(R1, R0);
+  __ LoadClassById(R2, R1, PP);
+  // R2: class of instance (R0).
+  __ ldr(R3, FieldAddress(R2, Class::signature_function_offset()));
+  __ CompareObject(R3, Object::null_object(), PP);
+  __ b(&fall_through, NE);
+
+  __ ldr(R3, FieldAddress(R2, Class::num_type_arguments_offset()), kHalfword);
+  __ CompareImmediate(R3, 0, kNoPP);
+  __ b(&fall_through, NE);
+
+  __ ldr(R0, FieldAddress(R2, Class::canonical_types_offset()));
+  __ CompareObject(R0, Object::null_object(), PP);
+  __ b(&fall_through, EQ);
+  __ ret();
+
+  __ Bind(&fall_through);
+}
+
+
 void Intrinsifier::String_getHashCode(Assembler* assembler) {
   Label fall_through;
   __ ldr(R0, Address(SP, 0 * kWordSize));