What does this log?

1.global _main
2.align 2
3_main:
4    stp x29, x30, [sp, #-16]!
5    mov w19, #0
6    mov w20, #1
7    mov w21, #6
81:
9    sub sp, sp, #16
10    str x19, [sp]
11    adrp x0, fmt@PAGE
12    add x0, x0, fmt@PAGEOFF
13    bl _printf
14    add sp, sp, #16
15    add w22, w19, w20
16    mov w19, w20
17    mov w20, w22
18    subs w21, w21, #1
19    bne 1b
20    ldp x29, x30, [sp], #16
21    mov w0, #0
22    ret
23.section __TEXT,__cstring
24fmt: .asciz "%d\n"