Add test_b(Operand, immediate) to ia32 assembler, and use it where possible. ...

src/ia32/macro-assembler-ia32.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 278 matching lines @@
                                              Register map,
                                              Register instance_type) {
   mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
   movzx_b(instance_type, FieldOperand(map, Map::kInstanceTypeOffset));
   ASSERT(kNotStringTag != 0);
   test(instance_type, Immediate(kIsNotStringMask));
   return zero;
 }
 
 
+void MacroAssembler::IsObjectJSObjectType(Register heap_object,
+                                          Register map,
+                                          Register scratch,
+                                          Label* fail) {
+  mov(map, FieldOperand(heap_object, HeapObject::kMapOffset));
+  IsInstanceJSObjectType(map, scratch, fail);
+}
+
+
+void MacroAssembler::IsInstanceJSObjectType(Register map,
+                                            Register scratch,
+                                            Label* fail) {
+  movzx_b(scratch, FieldOperand(map, Map::kInstanceTypeOffset));
+  sub(Operand(scratch), Immediate(FIRST_JS_OBJECT_TYPE));
+  cmp(scratch, LAST_JS_OBJECT_TYPE - FIRST_JS_OBJECT_TYPE);
+  j(above, fail);
+}
+
+
 void MacroAssembler::FCmp() {
   if (CpuFeatures::IsSupported(CMOV)) {
     fucomip();
     ffree(0);
     fincstp();
   } else {
     fucompp();
     push(eax);
     fnstsw_ax();
     sahf();
@@ skipping 1334 matching lines @@
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32