src/hotspot/cpu/x86/macroAssembler_x86.cpp

*** 1758,1768 ****
      movptr(tmpReg, Address(objReg, oopDesc::mark_offset_in_bytes()));          // [FETCH]
      testptr(tmpReg, markOopDesc::monitor_value); // inflated vs stack-locked|neutral|biased
      jccb(Assembler::notZero, IsInflated);
  
      // Attempt stack-locking ...
!     orptr (tmpReg, markOopDesc::unlocked_value);
      movptr(Address(boxReg, 0), tmpReg);          // Anticipate successful CAS
      if (os::is_MP()) {
        lock();
      }
      cmpxchgptr(boxReg, Address(objReg, oopDesc::mark_offset_in_bytes()));      // Updates tmpReg
--- 1758,1772 ----
      movptr(tmpReg, Address(objReg, oopDesc::mark_offset_in_bytes()));          // [FETCH]
      testptr(tmpReg, markOopDesc::monitor_value); // inflated vs stack-locked|neutral|biased
      jccb(Assembler::notZero, IsInflated);
  
      // Attempt stack-locking ...
!     orptr(tmpReg, markOopDesc::unlocked_value);
!     if (EnableValhalla && !UseBiasedLocking) {
!       // Mask always_locked bit such that we go to the slow path if object is a value type
!       andptr(tmpReg, ~markOopDesc::biased_lock_bit_in_place);
!     }
      movptr(Address(boxReg, 0), tmpReg);          // Anticipate successful CAS
      if (os::is_MP()) {
        lock();
      }
      cmpxchgptr(boxReg, Address(objReg, oopDesc::mark_offset_in_bytes()));      // Updates tmpReg