It took me a while to understand that internally it uses 128bit numbers, that `>... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

		juancn 21 days ago \| parent \| context \| favorite \| on: A Fast 64-Bit Date Algorithm (30–40% faster by cou... It took me a while to understand that internally it uses 128bit numbers, that `>> 64` in the pseudocode was super confusing until I saw the C++ code. Neat code though!

brucehoult 21 days ago [–]

Not really. It looks like that in the C code, but in the generated machine code it'll just be a single `MULH` instruction giving (only) the upper 64 bits of the result, no shift needed.

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact