Cleaning BSS in ARMv8-A

I am trying to write good and basic 'cleaning bss' code for my bootloader but AI's arguing me and I don't know what to do..

My code is this:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

ldr x2, =__bss_start

ldr x3, =__bss_size

cbz x3, start_main

udiv x3, x3, #8

mul x4, x3, #8

sub x5, __bss_size, x4

clear_bss:

cbz x3, check_remainder

str xzr, [x2], #8

sub x3, x3, #1

cbnz x3 clear_bss

check_remainder:

cbz x5, start_main

str xzr, [x2], #1

cbnz x5, check_remainder

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

But AI's forcing me to write instead of it:
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

ldr x2, =__bss_start
ldr x3, =__bss_size
cbz x3, start_main

clear_bss:
str xzr, [x2], #8
sub x3, x3, #1

cbnz x3, clear_bss

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

They say my code sucks, so complex and their code is basic and optimised.
What should I do??___###

Okay, Im reporting my question. I just write a question and think about it, update things and someone reports it..