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        segment .bss

set     resq    10

        segment .text

        global  main

main:

        push    rbp

        mov     rbp, rsp

        bts     qword [set], 4     ; set bit 4 of set

        bts     qword [set], 7     ; set bit 7 of set

        bts     qword [set], 8     ; set bit 8 of set

        bts     qword [set+8], 12  ; set bit 76 of set

        mov     rax, 76            ; test bits 4, 76, 77

        mov     rbx, rax           ; copy bit number to rbx

        shr     rbx, 6             ; qword number of set to test

        mov     rcx, rax           ; copy bit number to rcx

        and     rcx, 0x3f          ; extract rightmost 6 bits

        xor     edx, edx           ; set rdx to 0

        lea     r8,[set]

        bt      [r8+8*rbx], rcx    ; test bit

        setc    dl                 ; edx equals the tested bit

        bts     [r8+8*rbx], rcx    ; set the bit, insert into set

        btr     [r8+8*rbx], rcx    ; clear the bit, remove

        xor     rax, rax

        leave

        ret