zlacker

>>zxombi+(OP)
If I understand this correctly, we now get 128 bit pointers. The lower 64 bits are the address and the upper 64 bits are permissions.

Did I miss anything?

>>dilipp+j81
129 bits, there's a "valid" bit at the top. For most software this is invisible but some code will need to care (most notably, anything that copies pointers will need to preserve that bit.)