mov        %cr0, %rax
    mov        %cr4, %rbx
    and        $0xFFFF, %ax
    or         $0x12, %ax
    add        $8, %rbx
    or         $0x600, %rbx
    mov        %rbx, %cr4
   	mov        %rax, %cr0
    fninit
    push       $0x1F80
    ldmxcsr    (%rsp)
    addq       $8, %rsp