Invalidate registers if values are on the stack?

why does bb_start_block0_special in arch/x86/kdb/kdba_bt.c automatically
invalidate the register if the NS specifies that the contents of the
register is also on the stack?

        for (i = 0; i < r->mem_size; ++i) {
                value = r->mem[i].value;
                if (test_bit(value, r->skip_mem.bits)) {
                        /* this memory entry is not defined for this label */
                        continue;
                }
                bb_memory_set_reg_value(BBRG_RSP, r->mem[i].offset_address,
                                        value, 0);
                bb_reg_set_undef(value);
        }


mh

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