Optimisation & commenting

wtfstopw.asm

 	add dl, 0x30
 	mov byte [timestr + 5], dl
 
-	pop rax
 	xor rdx, rdx
 	mov rcx, 6
 	div rcx
 	push rax
-	mov rax, rdx
-	add al, 0x30
-	mov byte [timestr + 4], al
+	add dl, 0x30
+	mov byte [timestr + 4], dl
 
-	pop rax
 	xor rdx, rdx
 	mov rcx, 10
 	div rcx
-	push rax
-	mov rax, rdx
-	add al, 0x30
-	mov byte [timestr + 2], al
+	add dl, 0x30
+	mov byte [timestr + 2], dl
 
 	pop rax
 	xor rdx, rdx
 	mov rcx, 6
 	div rcx
-	push rax
-	mov rax, rdx
-	add al, 0x30
-	mov byte[timestr + 1], al
+	add dl, 0x30
+	mov byte[timestr + 1], dl
 
 	; filling the hours buffer
 	; r8 will contain our digits counter : max is 8
 	mov r8, 8
-	pop rax
 	print_time_hours_loop:
 		mov rcx, 10
 		xor rdx, rdx
 	add r8, 1
 	cmp r8, 7
 	jle print_time_hours_cont
-	mov r8, 7
+	mov r8, 7 ; maximum value for r8
 	print_time_hours_cont:
 	mov r9, hours
 	add r9, r8
 	mov rcx, 9
-	sub rcx, r8
-	add rcx, timestrlen
+	sub rcx, r8 ; rcx is hours size 
+	add rcx, timestrlen ; add to timestrlen
 
 	mov rax, 1 ; write
 	mov rdi, 1 ; stdout
-	mov rsi, r9
-	mov rdx, rcx
+	mov rsi, r9 ; start hours pointer
+	mov rdx, rcx ; size to timestr end
 	syscall
 
 	; Attempt to read from stdin
 	mov rdx, 1
 	syscall
 	cmp rax, 0
-	je newline
+	je newline_exit
 	jg flush_stdin
 
 exit:
 	mov rdi, 1 ; failure
 	syscall
 
-newline:
+newline_exit:
 	mov rax, 1
 	mov rdi, 1
 	mov rsi, nl