# (c) 2023 Tan, Kian-ting
#  ===
#  Tiananmen Massacre - Hong Kong Independence - Free Hong Kong, Tibet, Southern Mongolia
#  Uyghur Concentration Camps - Taiwan Independence - Chinese Internet Censorships
#  Red Terror by Chinese Communist Party
#  ===
# 9 * 9 multipulation table

# storing string
        .data
format: .asciz "%d * %d = %d\n" #string succeeded by '\0'

        .text
.global main

loop1:
        # b += 1
        addq    $1, %r9

        # a = 0
        movq    $1, %r8

        # goto loop
        jmp     loop

loop:

        mov     %r8, %rsi
        mov     %r9, %rdx
        
        # rcx = r8 * r9
        mov     %r8, %rcx
        imulq   %r9, %rcx

        xor     %rax, %rax # rax = 0
        # backup r8, rdi, r9
        mov     %r8, %r12
        mov     %rdi, %r13
        mov     %r9, %r14
        # printf(rdi, rsi, rdx, rcx);
        call    printf

        # restore r8, rdi, r9
        mov     %r14, %r9
        mov     %r13, %rdi
        mov     %r12, %r8

        # a += 1
        addq    $1, %r8

        # IF a  <= 9 goto loop
        cmp     $9, %r8
        jle      loop

        # IF b < 9 goto loop1
        cmp     $9, %r9
        jl      loop1

        # goto final
        jmp     final
main:

        push    %rbx
        mov     $1,  %r8    # r8 = a
        mov     $1,  %r9    # r9 = b
        mov     $0,  %r15
        mov     $format, %rdi
        jmp     loop

final: 
        pop %rbx
        ret