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Asked: 2026-06-03T03:32:58+00:00

I am unable to understand the usefulness of LOOPNE. Even if LOOPNE was not

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I am unable to understand the usefulness of LOOPNE. Even if LOOPNE was not there and only LOOP was there, it would have done the same thing here. Please help me out.

MOV CX, 80
MOV AH,1
INT 21H
CMP AL, ' '
LOOPNE BACK
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1 Answer

  1. Editorial Team

    CMP is more or less a SUB instruction without changing the value, which means that it sets flags such as ZF (the zero flag).

    LOOPNE has 2 conditions to loop: cx > 0 and ZF = 0

    LOOP has 1 condition to loop: cx > 0

    So, a normal LOOP would go through all characters, whereas LOOPNE will go through all characters, or until a space is encountered. Whichever comes first

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