src/hotspot/cpu/x86/macroAssembler_x86.cpp

*** 3726,3735 ****
--- 3726,3749 ----
      cmpptr(value, temp_reg);
      jcc(Assembler::greaterEqual, not_buffered);
    }
  }
  
+ void MacroAssembler::test_oop_is_not_value(Register oop, Register temp, Label& is_not_value) {
+   const int mask = Universe::oop_metadata_valuetype_mask();
+ #ifdef _LP64
+   if (UseCompressedClassPointers) {
+     movl(temp, Address(oop, oopDesc::klass_offset_in_bytes()));
+   } else
+ #endif
+   movptr(temp, Address(oop, oopDesc::klass_offset_in_bytes()));
+ 
+   andl(temp, mask);
+   testl(temp, temp);
+   jcc(Assembler::zero, is_not_value);
+ }
+ 
  void MacroAssembler::os_breakpoint() {
    // instead of directly emitting a breakpoint, call os:breakpoint for better debugability
    // (e.g., MSVC can't call ps() otherwise)
    call(RuntimeAddress(CAST_FROM_FN_PTR(address, os::breakpoint)));
  }