Integer Overflow Checking Cost

iiwsk 2 days ago 5 commentsRead Article on danluu.com

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Discussion (5 Comments)Read Original on HackerNews

tcfhgj•about 1 hour ago

Definitely cheaper than using Electron I would say

mayoff•about 2 hours ago

In Swift (Apple’s C++ successor), the normal operators (`+`, `-`, `*`) trap on overflow for integer types. If you want twos complement wrapping, you can use `&+`, `&-`, and `&*`.

Given that Apple has been making its own CPU cores for years now, I suspect overflowing checking on Apple CPUs is virtually free (aside from code size).

gnabgib•2 days ago

2014 (probably? Or 2008. Old and no date) Previously (166 points, 2014, 107 comments) https://news.ycombinator.com/item?id=8765714

zahlman•2 days ago

Resubmitting it seems timely, given recent Linux kernel news (e.g. https://lwn.net/Articles/1065889/).

aw1621107•about 3 hours ago

The archive says "12/14", so 2014 seems about right.