Assignment-4

section .data
array db 11h, 55h, 33h, 22h,44h
msg1 db 10,13,"Largest no in an array is:"
len1 equ $-msg1
section .bss
cnt resb 1
result resb 16
%macro dispmsg 2
mov Rax,1
mov Rdi,1
mov rsi,%1
mov rdx,%2
syscall
%endmacro
section .text
global _start
_start:
mov byte[cnt],5
mov rsi,array
mov al,0
LP: cmp al,[rsi]
jg skip
xchg al ,[rsi]
skip: inc rsi
dec byte[cnt]
jnz LP

;display al
call display
;display message
mov Rax,1
mov Rdi,1
mov Rsi,msg1

mov Rdx,len1
syscall


dispmsg result,16        ;call to macro
;exit system call
mov Rax ,60
mov Rdi,0
syscall

display:
mov rbx,rax                      ; store no in rbx
mov rdi,result                   ;point rdi to result variable 
mov cx,16                        ;load count of rotation in cl  
up1: 
rol rbx,04               ;rotate no of left by four bits
mov al,bl         ; move lower byte in dl
and al,0fh               ;get only LSB
cmp al,09h               ;compare with 39h
jg add_37                ;if greater than 39h skip add 37    
add al,30h                
jmp skip1                 ;else add 30     
add_37: 
add al,37h                 
skip1: 
mov [rdi],al             ;store ascii code in result variable
inc rdi                  ; point to next byte
dec cx                   ; decrement counter
jnz up1                  ; if not zero jump to repeat
ret