x86-64でFizzBuzzしてみた ref: http://qiita.com/make_now_just/items/5d659b17637ec1f32c37

fizzbuzz.s

    # .rodataには定数を置く
    .section .rodata

fizz: .ascii "Fizz"
buzz: .ascii "Buzz"

    # .dataには変数を置く
    .section .data

char: .ascii "0"

    # .textにはプログラムを置く
    .section .text
    .global _start

_start:
    xor %r8, %r8        # %r8 = 0

loop.begin:
    inc %r8             # %r8 += 1
    cmp $101, %r8       # if (%r8 == 101)
    je  loop.break      #   goto loop.break

    xor %rdx, %rdx      # %rdx = 0
    mov %r8, %rax       # %rax = %r8
    mov $3, %r9         # %r9 = 3
    div %r9             # %rax = %rdx:%rax / %r9, %rdx = %rdx:%rax % %r9
    mov %rdx, %r10      # %r10 = %rdx

    xor %rdx, %rdx      # %rdx = 0
    mov %r8, %rax       # %rax = %r8
    mov $5, %r9         # %r9 = 3
    div %r9             # %rax = %rdx:%rax / %r9, %rdx = %rdx:%rax % %r9
    mov %rdx, %r11      # %r11 = %rdx

    cmp $0, %r10        # if (%r10 == 0) // 3で割り切れるとき
    je  loop.fizz       #   goto loop.fizz
    cmp $0, %r11        # if (%r11 == 0) // 5で割り切れるとき
    je  loop.buzz       #   goto loop.buzz
    jmp loop.int        # goto loop.int

loop.fizz:
    cmp $0, %r11        # if (%r11 == 0) // 3と5で割り切れるとき
    je loop.fizzbuzz    #   goto loop.fizzbuzz

    call    print_fizz    # print_fizz()
    jmp loop.end        # goto loop.end

loop.buzz:
    call    print_buzz    # print_buzz()
    jmp loop.end        # goto loop.end

loop.fizzbuzz:
    call    print_fizz    # print_fizz()
    call    print_buzz    # print_buzz()
    jmp loop.end        # goto loop.end

loop.int:
    mov %r8, %r9        # %r9 = %r8
    call    print_int     # print_int(%r9)

loop.end:
    call    newline       # newline()
    jmp loop.begin      # goto loop.begin

loop.break:
    call exit0          # exit0()

# fizzと表示する
print_fizz:
    lea fizz(%rip), %rsi
    mov $4, %rdx
    call print
    ret

# buzzと表示する
print_buzz:
    lea buzz(%rip), %rsi
    mov $4, %rdx
    call print
    ret

# 改行する
newline:
    mov $0x0a, %r11
    mov %r11, char(%rip)
    lea char(%rip), %rsi
    xor %rdx, %rdx
    inc %rdx
    call print
    ret

# %r9に渡された3桁以内の数値を文字列として表示する(%rax, %rdx, %r11, %r12を使用)
print_int:
    # 100で割り、商が0以外のとき文字にして表示
    # つまり、3桁目(100の位)の数値を表示
    xor %rdx, %rdx       # %rdx = 0
    mov %r9, %rax        # %rax = %r9
    mov $100, %r11       # %r11 = 100
    div %r11             # %rax = %rdx:%rax / %r11, %rdx = %rdx:%rax % %r11
    cmp $0, %rax         # if (%rax == 0)
    je print_int.1       #   goto print_int.1
    mov %rdx, %r9        # %r9 = %rdx
    xor %rdx, %rdx       # %rdx = 0
    inc %rdx             # %rdx += 1 (==> %rdx = 1)
    add $0x30, %rax      # %rax += 0x30
    mov %rax, char(%rip) # *char = %rax
    lea char(%rip), %rsi # %rsi = char
    call print           # print (%rsi, %rdx)
print_int.1:
    # 10で割り、商が0以外のとき文字にして表示
    # つまり、2桁目(10の位)の数値を表示
    xor %rdx, %rdx       # %rdx = 0
    mov %r9, %rax        # %rax = %r9
    mov $10, %r11        # %r11 = 10
    div %r11             # %rax = %rdx:%rax / %r11, %rdx = %rdx:%rax % %r11
    cmp $0, %rax         # if (%rax == 0)
    je print_int.2       #   goto print_int.2
    mov %rdx, %r9        # %r9 = %rdx
    xor %rdx, %rdx       # %rdx = 0
    inc %rdx             # %rdx += 1 (==> %rdx = 1)
    add $0x30, %rax      # %rax += 0x30
    mov %rax, char(%rip) # *char = %rax
    lea char(%rip), %rsi # %rsi = char
    call print           # print(%rsi, %rdx)
print_int.2:
    # 1の位の数値を表示
    add $0x30, %r9       # %r9 += 0x30
    mov %r9, char(%rip)  # *char = %r9
    lea char(%rip), %rsi # %rsi = char
    call print           # print(%rsi, %rdx)
    ret                  # return

# %rsiに指定されたアドレスから、%rdx文字数分だけ表示する
print:
    xor %rax, %rax
    inc %rax
    mov %rax, %rdi
    # %rax = 1 (syswrite)
    # %rdi = 1 (stdout)
    syscall
    ret

# リターンコード0で終了する
exit0:
    xor %rax, %rax
    mov %rax, %rdi
    mov $60, %al
    # %rax = 60 (sysexit)
    # %rdi = 0
    syscall