I have written an assembly code that includes:
XOR BL,BL
MOV CX,0
TOP:
INC BL,1
MOV AH,2
MOV DL, BL
INT 21H
LOOP TOP
The loop is executed a really large number of times (more than 10,000 for sure). What could be the possible reason behind the loop execution of such a high time? I am very new in assembly language and found nothing efficient to my code related to CX=0. Thanks in Advance.
Your counter cx was not properly initialized. The instruction loop does two things:
dec cx ;◄■■■ DECREASE THE COUNTER.
jnz label ;◄■■■ IF COUNTER IS NOT ZERO, JUMP TO LABEL TO REPEAT.
In your code the counter cx was initialized as zero, so, when the loop instruction executes, it does cx - 1, which is 0 - 1, so cx becomes 0ffffh and your loop will repeat 0ffffh times.
Move another value to your counter cx, for example, mov cx, 10, so your loop will repeat 10 times.
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