src/hotspot/cpu/x86/x86_64.ad

*** 5312,20 ***
--- 5312,44 ---
  %}
  
  // Load narrow Klass Pointer
  instruct loadNKlass(rRegN dst, memory mem)
  %{
+   predicate(!UseCompactObjectHeaders);
    match(Set dst (LoadNKlass mem));
  
    ins_cost(125); // XXX
    format %{ "movl    $dst, $mem\t# compressed klass ptr" %}
    ins_encode %{
      __ movl($dst$$Register, $mem$$Address);
    %}
    ins_pipe(ialu_reg_mem); // XXX
  %}
  
+ instruct loadNKlassLilliput(rRegN dst, indOffset8 mem, rFlagsReg cr)
+ %{
+   predicate(UseCompactObjectHeaders);
+   match(Set dst (LoadNKlass mem));
+   effect(KILL cr);
+   ins_cost(125); // XXX
+   format %{ "movl    $dst, $mem\t# compressed klass ptr" %}
+   ins_encode %{
+     assert($mem$$disp == oopDesc::klass_offset_in_bytes(), "expect correct offset 4, but got: %d", $mem$$disp);
+     assert($mem$$index == 4, "expect no index register: %d", $mem$$index);
+     Register dst = $dst$$Register;
+     Register obj = $mem$$base$$Register;
+     C2LoadNKlassStub* stub = new (Compile::current()->comp_arena()) C2LoadNKlassStub(dst);
+     Compile::current()->output()->add_stub(stub);
+     __ movq(dst, Address(obj, oopDesc::mark_offset_in_bytes()));
+     __ testb(dst, markWord::monitor_value);
+     __ jcc(Assembler::notZero, stub->entry());
+     __ bind(stub->continuation());
+     __ shrq(dst, markWord::klass_shift);
+   %}
+   ins_pipe(pipe_slow); // XXX
+ %}
+ 
  // Load Float
  instruct loadF(regF dst, memory mem)
  %{
    match(Set dst (LoadF mem));
  

*** 12692,10 ***
--- 12716,11 ---
    ins_pipe(ialu_cr_reg_imm);
  %}
  
  instruct compN_mem_imm_klass(rFlagsRegU cr, memory mem, immNKlass src)
  %{
+   predicate(!UseCompactObjectHeaders);
    match(Set cr (CmpN src (LoadNKlass mem)));
  
    format %{ "cmpl    $mem, $src\t# compressed klass ptr" %}
    ins_encode %{
      __ cmp_narrow_klass($mem$$Address, (Klass*)$src$$constant);