2768   bind(no_reserved_zone_enabling);
2769   BLOCK_COMMENT("} reserved_stack_check");
2770 }
2771 
2772 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
2773 void MacroAssembler::tlab_allocate(Register obj,
2774                                    Register var_size_in_bytes,
2775                                    int con_size_in_bytes,
2776                                    Register t1,
2777                                    Label& slow_case) {
2778   assert_different_registers(obj, var_size_in_bytes, t1);
2779   Register end = t1;
2780   Register thread = Z_thread;
2781 
2782   z_lg(obj, Address(thread, JavaThread::tlab_top_offset()));
2783   if (var_size_in_bytes == noreg) {
2784     z_lay(end, Address(obj, con_size_in_bytes));
2785   } else {
2786     z_lay(end, Address(obj, var_size_in_bytes));
2787   }
2788   z_cg(end, Address(thread, JavaThread::tlab_end_offset()));
2789   branch_optimized(bcondHigh, slow_case);
2790 
2791   // Update the tlab top pointer.
2792   z_stg(end, Address(thread, JavaThread::tlab_top_offset()));
2793 
2794   // Recover var_size_in_bytes if necessary.
2795   if (var_size_in_bytes == end) {
2796     z_sgr(var_size_in_bytes, obj);
2797   }
2798 }
2799 
2800 // Emitter for interface method lookup.
2801 //   input: recv_klass, intf_klass, itable_index
2802 //   output: method_result
2803 //   kills: itable_index, temp1_reg, Z_R0, Z_R1
2804 // TODO: Temp2_reg is unused. we may use this emitter also in the itable stubs.
2805 // If the register is still not needed then, remove it.
2806 void MacroAssembler::lookup_interface_method(Register           recv_klass,
2807                                              Register           intf_klass,
2808                                              RegisterOrConstant itable_index,

2768   bind(no_reserved_zone_enabling);
2769   BLOCK_COMMENT("} reserved_stack_check");
2770 }
2771 
2772 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
2773 void MacroAssembler::tlab_allocate(Register obj,
2774                                    Register var_size_in_bytes,
2775                                    int con_size_in_bytes,
2776                                    Register t1,
2777                                    Label& slow_case) {
2778   assert_different_registers(obj, var_size_in_bytes, t1);
2779   Register end = t1;
2780   Register thread = Z_thread;
2781 
2782   z_lg(obj, Address(thread, JavaThread::tlab_top_offset()));
2783   if (var_size_in_bytes == noreg) {
2784     z_lay(end, Address(obj, con_size_in_bytes));
2785   } else {
2786     z_lay(end, Address(obj, var_size_in_bytes));
2787   }
2788   z_cg(end, Address(thread, JavaThread::tlab_current_end_offset()));
2789   branch_optimized(bcondHigh, slow_case);
2790 
2791   // Update the tlab top pointer.
2792   z_stg(end, Address(thread, JavaThread::tlab_top_offset()));
2793 
2794   // Recover var_size_in_bytes if necessary.
2795   if (var_size_in_bytes == end) {
2796     z_sgr(var_size_in_bytes, obj);
2797   }
2798 }
2799 
2800 // Emitter for interface method lookup.
2801 //   input: recv_klass, intf_klass, itable_index
2802 //   output: method_result
2803 //   kills: itable_index, temp1_reg, Z_R0, Z_R1
2804 // TODO: Temp2_reg is unused. we may use this emitter also in the itable stubs.
2805 // If the register is still not needed then, remove it.
2806 void MacroAssembler::lookup_interface_method(Register           recv_klass,
2807                                              Register           intf_klass,
2808                                              RegisterOrConstant itable_index,