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Asked: 2026-06-17T21:54:05+00:00

I have this very simple assembly code: start: add ax, 100 ; if ax

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I have this very simple assembly code:

start:
add ax, 100    
; if ax overflow add to bx 1
jmp start

but i don’t know how to detect ax register overflow, can anyone help me?

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1 Answer

  1. Editorial Team

    ADD instruction sets appropriate FLAGS reflecting the overflow condition. There are two kinds of overflow: signed and unsigned. You have to decide what’s appropriate and use jc/jnc for unsigned and jo/jno for signed.

    add ax, 100
jnc noUnsignedOverflow
...
noUnsignedOverflow:

add ax, 100
jno noSignedOverflow
...
noSignedOverflow:
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