Function opnd_create_reg_ex 

pub unsafe extern "C" fn opnd_create_reg_ex(
    r: reg_id_t,
    subsize: opnd_size_t,
    flags: dr_opnd_flags_t,
) -> opnd_t

Returns a register operand with additional properties specified by \p flags. If \p subsize is 0, creates a full-sized register; otherwise, creates a partial register in the manner of opnd_create_reg_partial().