<p>HDL fiddling randomly got me thinking about old FPGA carry logic hacks: <a href="https://gist.github.com/pervognsen/c62cdb4c73b3321d9d9ab48d0898ffc2" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://</span><span class="ellipsis">gist.github.com/pervognsen/c62</span><span class="invisible">cdb4c73b3321d9d9ab48d0898ffc2</span></a></p>