Apparently modern Intel CPUs will fuse JO instructions to preceding adds, producing the effect of dedicated &quot;checked add&quot; instructions:<p><a href="https:&#x2F;&#x2F;gist.github.com&#x2F;regehr&#x2F;65252e90fb6bad82d533#gistcomment-1733637" rel="nofollow">https:&#x2F;&#x2F;gist.github.com&#x2F;regehr&#x2F;65252e90fb6bad82d533#gistcomm...</a>