.cpu cortex-a72
.fpu neon-fp-armv8

.data
input: .asciz "Please enter the Fibonacci number: "
recur: .asciz "%d"
output: .asciz "%d is the number in the sequence."

.text
.align 2
.global main
.type main, %function

main:

   push {fp, lr}
   add fp, sp, #4

   mov r5, #1 @ these registers and r1 will be used to
   mov r6, #0 @ calculate the fibonacci sum

   ldr r0, =input @read Fibonacci no.
   bl printf
   ldr r0, =recur
   sub sp, sp, #4
   mov r1, sp
   bl scanf
   ldr r7, [sp]

loop:
    add r0, r5, r6
    mov r6, r5
    mov r5, r0
    sub r7, r0, #1
    cmp r7, #1
    ble end
    b loop

end:
    ldr r0, =output
    mov r1, r7
    bl printf
    sub sp, fp, #4
    pop {fp, pc}