libdis_test:     66 0f c7 f3        rdrand %bx
    libdis_test+0x4: 0f c7 f3           rdrand %ebx
    libdis_test+0x7: 66 0f c7 fb        rdseed %bx
    libdis_test+0xb: 0f c7 fb           rdseed %ebx