libdis_test:     66 0f ae 30        clwb   (%eax)
    libdis_test+0x4: 0f ae 3b           clflush (%ebx)
    libdis_test+0x7: 66 0f ae 39        clflushopt (%ecx)
    libdis_test+0xb: 0f 01 fc           clzero