zombie-core-utils/monkie/3x+1.asm

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extern puts
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%include "../inc/atoi_func.inc"
section .data
text db "Number reaches 1",0
even db "even",0
odd db "odd",0
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number db "42",0
tempstore db 0
section .text
global main
main:
sub rsp, 8
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add rsi, 8
mov r8, [rsi]
mov r9, [r8]
mov [tempstore], r9
mov rdi, number
call atoi_func
mov r8, rax
_loop:
cmp r8, 1 ;if number is 1 then end
je _printstupid
test r8, 1 ;odd even check
jnz _odd
jz _even
_odd:
; mov rdi, odd
; cld
; call puts
mov rax, r8 ; gotta do this because mul only takes one argument
mov r9, 3
mul r9
add rax, 1
mov r8, rax
jmp _loop
_even:
; mov rdi, even
; cld
; call puts
xor rdx, rdx
mov rax, r8
mov rcx, 2
div rcx
mov r8, rax
jmp _loop
_printstupid:
mov rdi, text
cld
call puts ;this is the put s way of printing a string
_end:
add rsp, 8
ret