概要
paiza.ioでelixirやってみた。
練習問題やってみた。
練習問題
アセンブラでfizzbuzzを求めよ。
サンプルコード
File.write "hello.s", """
.code64
.text
.global main
main:
sub $8, %rsp
mov $1, %r8
loop:
mov $0, %r10
mov $0, %rdx
mov %r8, %rax
mov $3, %rsi
div %esi
cmp $0, %rdx
jne skip1
add $1, %r10
skip1:
mov $0, %rdx
mov %r8, %rax
mov $5, %rsi
div %esi
cmp $0, %rdx
jne skip2
add $2, %r10
skip2:
cmp $0, %r10
je printNum
cmp $2, %r10
jb printFizz
je printBuzz
ja printFizzBuzz
printNum:
lea num(%rip), %rdi
jmp loope
printFizz:
lea fizz(%rip), %rdi
jmp loope
printBuzz:
lea buzz(%rip), %rdi
jmp loope
printFizzBuzz:
lea fizzbuzz(%rip), %rdi
loope:
mov $1, %rax
mov %r8, %rsi
push %r8
push %r10
call printf
pop %r10
pop %r8
add $1, %r8
cmp $101, %r8
jne loop
add $8, %rsp
ret
.data
num:
.asciz "%i "
fizz:
.asciz "Fizz "
buzz:
.asciz "Buzz "
fizzbuzz:
.asciz "FizzBuzz "
"""
{result, 0} = System.shell("gcc -no-pie hello.s")
IO.puts result
{result, 5} = System.shell("./a.out")
IO.puts result
実行結果
1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 FizzBuzz 16 17 Fizz 19 Buzz Fizz 22 23 Fizz Buzz 26 Fizz 28 29 FizzBuzz 31 32 Fizz 34 Buzz Fizz 37 38 Fizz Buzz 41 Fizz 43 44 FizzBuzz 46 47 Fizz 49 Buzz Fizz 52 53 Fizz Buzz 56 Fizz 58 59 FizzBuzz 61 62 Fizz 64 Buzz Fizz 67 68 Fizz Buzz 71 Fizz 73 74 FizzBuzz 76 77 Fizz 79 Buzz Fizz 82 83 Fizz Buzz 86 Fizz 88 89 FizzBuzz 91 92 Fizz 94 Buzz Fizz 97 98 Fizz Buzz
成果物
以上。