Improve type checking, remove unused stub (removed also in x64 in preparation of porting the better…

runtime/vm/stub_code_ia32.cc

Index: runtime/vm/stub_code_ia32.cc
===================================================================
--- runtime/vm/stub_code_ia32.cc	(revision 7391)
+++ runtime/vm/stub_code_ia32.cc	(working copy)
@@ -1750,74 +1750,6 @@
 }
 
 
-// Check if an instance class is a subtype of class/interface using simple
-// superchain and interface array traversal. Does not take type parameters into
-// account.
-// Cannot handle Smi instances (must be tested beforehand).
-// EAX: instance (to be preserved).
-// ECX: class to test.
-// EDX: class/interface to test against (is class of instance a subtype of it).
-//      (preserved).
-// Result in EBX: 1 is subtype, 0 maybe not.
-// Destroys EBX, EDI, ECX.
-void StubCode::GenerateIsRawSubTypeStub(Assembler* assembler) {
-  const Immediate raw_null =
-      Immediate(reinterpret_cast<intptr_t>(Object::null()));
-  Label test_class, not_found, found;
-
-  __ movzxb(EBX, FieldAddress(EDX, Class::is_interface_offset()));
-  // Check if we are comparing against class or interface.
-  __ cmpl(EBX, Immediate(0));
-  __ j(EQUAL, &test_class, Assembler::kNearJump);
-
-  // Get interfaces array from instance class.
-  __ movl(EBX, FieldAddress(ECX, Class::interfaces_offset()));
-  __ cmpl(EBX, raw_null);
-  __ j(EQUAL, &not_found, Assembler::kNearJump);
-  __ movl(EDI, FieldAddress(EBX, Array::length_offset()));
-  // EDI: array index.
-  // EBX: interface array.
-  // EDX: interface searched
-  Label array_loop;
-  __ Bind(&array_loop);
-  __ subl(EDI, Immediate(Smi::RawValue(1)));
-  __ j(LESS, &not_found, Assembler::kNearJump);
-  // EDI is Smi therefore TIMES_2 instead of TIMES_4.
-  // Get type from array.
-  __ movl(ECX, FieldAddress(EBX, EDI, TIMES_2, Array::data_offset()));
-  __ movl(ECX, FieldAddress(ECX, Type::type_class_offset()));
-  __ cmpl(ECX, EDX);
-  __ j(EQUAL, &found, Assembler::kNearJump);
-  __ jmp(&array_loop, Assembler::kNearJump);
-
-  __ Bind(&not_found);
-  __ xorl(EBX, EBX);
-  __ ret();
-
-  __ Bind(&found);
-  __ movl(EBX, Immediate(1));
-  __ ret();
-
-  __ Bind(&test_class);
-  // EDX: test class.
-  __ cmpl(ECX, EDX);
-  __ j(EQUAL, &found, Assembler::kNearJump);
-
-  // Check superclasses using a loop (faster than runtime call).
-  Label super_loop;
-  __ Bind(&super_loop);
-  // ECX: class -> super.
-  __ movl(ECX, FieldAddress(ECX, Class::super_type_offset()));
-  // The supertype of Object is a null object.
-  __ cmpl(ECX, raw_null);
-  __ j(EQUAL, &not_found, Assembler::kNearJump);
-  __ movl(ECX, FieldAddress(ECX, Type::type_class_offset()));
-  __ cmpl(EDX, ECX);
-  __ j(NOT_EQUAL, &super_loop, Assembler::kNearJump);
-  __ jmp(&found, Assembler::kNearJump);
-}
-
-
 // Used to check class and type arguments. Arguments passed on stack:
 // TOS + 0: return address.
 // TOS + 1: instantiator type arguments (can be NULL).