2766   bind(no_reserved_zone_enabling);
2767   BLOCK_COMMENT("} reserved_stack_check");
2768 }
2769 
2770 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
2771 void MacroAssembler::tlab_allocate(Register obj,
2772                                    Register var_size_in_bytes,
2773                                    int con_size_in_bytes,
2774                                    Register t1,
2775                                    Label& slow_case) {
2776   assert_different_registers(obj, var_size_in_bytes, t1);
2777   Register end = t1;
2778   Register thread = Z_thread;
2779 
2780   z_lg(obj, Address(thread, JavaThread::tlab_top_offset()));
2781   if (var_size_in_bytes == noreg) {
2782     z_lay(end, Address(obj, con_size_in_bytes));
2783   } else {
2784     z_lay(end, Address(obj, var_size_in_bytes));
2785   }
2786   z_cg(end, Address(thread, JavaThread::tlab_end_offset()));
2787   branch_optimized(bcondHigh, slow_case);
2788 
2789   // Update the tlab top pointer.
2790   z_stg(end, Address(thread, JavaThread::tlab_top_offset()));
2791 
2792   // Recover var_size_in_bytes if necessary.
2793   if (var_size_in_bytes == end) {
2794     z_sgr(var_size_in_bytes, obj);
2795   }
2796 }
2797 
2798 // Emitter for interface method lookup.
2799 //   input: recv_klass, intf_klass, itable_index
2800 //   output: method_result
2801 //   kills: itable_index, temp1_reg, Z_R0, Z_R1
2802 // TODO: Temp2_reg is unused. we may use this emitter also in the itable stubs.
2803 // If the register is still not needed then, remove it.
2804 void MacroAssembler::lookup_interface_method(Register           recv_klass,
2805                                              Register           intf_klass,
2806                                              RegisterOrConstant itable_index,

2766   bind(no_reserved_zone_enabling);
2767   BLOCK_COMMENT("} reserved_stack_check");
2768 }
2769 
2770 // Defines obj, preserves var_size_in_bytes, okay for t2 == var_size_in_bytes.
2771 void MacroAssembler::tlab_allocate(Register obj,
2772                                    Register var_size_in_bytes,
2773                                    int con_size_in_bytes,
2774                                    Register t1,
2775                                    Label& slow_case) {
2776   assert_different_registers(obj, var_size_in_bytes, t1);
2777   Register end = t1;
2778   Register thread = Z_thread;
2779 
2780   z_lg(obj, Address(thread, JavaThread::tlab_top_offset()));
2781   if (var_size_in_bytes == noreg) {
2782     z_lay(end, Address(obj, con_size_in_bytes));
2783   } else {
2784     z_lay(end, Address(obj, var_size_in_bytes));
2785   }
2786   z_cg(end, Address(thread, JavaThread::tlab_current_end_offset()));
2787   branch_optimized(bcondHigh, slow_case);
2788 
2789   // Update the tlab top pointer.
2790   z_stg(end, Address(thread, JavaThread::tlab_top_offset()));
2791 
2792   // Recover var_size_in_bytes if necessary.
2793   if (var_size_in_bytes == end) {
2794     z_sgr(var_size_in_bytes, obj);
2795   }
2796 }
2797 
2798 // Emitter for interface method lookup.
2799 //   input: recv_klass, intf_klass, itable_index
2800 //   output: method_result
2801 //   kills: itable_index, temp1_reg, Z_R0, Z_R1
2802 // TODO: Temp2_reg is unused. we may use this emitter also in the itable stubs.
2803 // If the register is still not needed then, remove it.
2804 void MacroAssembler::lookup_interface_method(Register           recv_klass,
2805                                              Register           intf_klass,
2806                                              RegisterOrConstant itable_index,