89 lines
2.2 KiB
NASM
89 lines
2.2 KiB
NASM
|
; THIS CODE HAS BEEN TESTED AND IS FULLY OPERATIONAL.
|
||
|
|
|
||
|
|
; Problem Statement: Write X86/64 ALP to count number of positive and negative numbers from the array.
|
||
|
|
|
||
|
|
; Code from Microprocessor (SPPU - Second Year - Computer Engineering - Content) repository on KSKA Git: https://git.kska.io/sppu-se-comp-content/Microprocessor/
|
||
|
|
|
||
|
|
|
||
|
|
; BEGINNING OF CODE
|
||
|
|
%macro print 2
|
||
|
|
mov rax,1 ; Standard output
|
||
|
|
mov rdi,1 ; Input write
|
||
|
|
mov rsi,%1 ; Display message address
|
||
|
|
mov rdx,%2 ; Message length
|
||
|
|
syscall ; Interrupt for kernel in 64-bit
|
||
|
|
%endmacro
|
||
|
|
|
||
|
|
section .data
|
||
|
|
|
||
|
|
m1 db 10,"ALP to count positive and negative numbers from an array",10
|
||
|
|
l1 equ $-m1
|
||
|
|
|
||
|
|
m2 db 10,"The count of positive numbers is:",10
|
||
|
|
l2 equ $-m2
|
||
|
|
|
||
|
|
m3 db 10,"The count of negative numbers is:",10
|
||
|
|
l3 equ $-m3
|
||
|
|
|
||
|
|
;array dw 8132h,6879h,711Ah,3567h,4567h
|
||
|
|
;array dd 81328132h,12346879h,6735711Ah,34563567h,67894567h
|
||
|
|
array dq 81328132ABCDh,12346879AAAAh,6735711AFFFFh,34563567EEEEh,67894567DEFAh
|
||
|
|
|
||
|
|
newline db 10
|
||
|
|
pcnt db 00
|
||
|
|
ncnt db 00
|
||
|
|
|
||
|
|
section .bss
|
||
|
|
displaybuffer resb 2
|
||
|
|
|
||
|
|
section .text
|
||
|
|
|
||
|
|
global _start:
|
||
|
|
_start:
|
||
|
|
|
||
|
|
print m1,l1
|
||
|
|
|
||
|
|
mov rsi,array
|
||
|
|
mov rcx,05
|
||
|
|
|
||
|
|
up:
|
||
|
|
bt qword [rsi],63 ; Check the most significant bit for negativity
|
||
|
|
jnc pnxt ; If not negative, jump to pnxt
|
||
|
|
inc byte[ncnt] ; Increment negative count
|
||
|
|
jmp pskip ; Jump to pskip
|
||
|
|
pnxt: inc byte[pcnt] ; Increment positive count
|
||
|
|
pskip: add rsi,8 ; Move to next 8 bytes
|
||
|
|
loop up ; Loop until rcx becomes zero
|
||
|
|
|
||
|
|
print m2,l2
|
||
|
|
mov bl,[pcnt]
|
||
|
|
call display
|
||
|
|
print newline,1
|
||
|
|
|
||
|
|
print m3,l3
|
||
|
|
mov bl,[ncnt]
|
||
|
|
call display
|
||
|
|
print newline,1
|
||
|
|
|
||
|
|
mov rax,60
|
||
|
|
syscall
|
||
|
|
|
||
|
|
display:
|
||
|
|
mov rdi,displaybuffer ; Destination for displaying
|
||
|
|
mov rcx,02 ; Display 2 characters
|
||
|
|
dloop:
|
||
|
|
rol bl,04 ; Rotate left by 4 bits
|
||
|
|
mov dl,bl ; Move contents of bl to dl
|
||
|
|
and dl,0fh ; Mask out upper bits
|
||
|
|
add dl,30h ; Convert to ASCII
|
||
|
|
cmp dl,39h ; Compare if greater than '9'
|
||
|
|
jbe skip ; Jump if below or equal
|
||
|
|
add dl,07h ; Adjust for letters
|
||
|
|
skip:
|
||
|
|
mov [rdi],dl ; Store the character
|
||
|
|
inc rdi ; Move to next position
|
||
|
|
loop dloop ; Loop until rcx becomes zero
|
||
|
|
print displaybuffer,2 ; Print the display buffer
|
||
|
|
ret
|
||
|
|
; END OF CODE
|