domenic at domenicdenicola.com (2013-07-25T19:58:04.233Z)
It's not equivalent for values greater than 2^31. The `|` version wraps around; `div` would give the correct answer.
domenic at domenicdenicola.com (2013-07-25T19:55:28.852Z)
On Thu, Jul 25, 2013 at 12:00 PM, Brendan Eich <brendan at mozilla.com> wrote: > This turns out to be equivalent to > > ```js > (a/b)|0 > ``` > > which is how asm.js optimizes to avoid the FPU already. It's not equivalent for values greater than 2^31. The `|` version wraps around; `div` would give the correct answer.
On Thu, Jul 25, 2013 at 12:00 PM, Brendan Eich <brendan at mozilla.com> wrote: > Michael Haufe wrote: > >> In 2008 I first proposed the addition of an integer division operator to >> the language. At the time Brendan noted his regret for this oversight and >> desire for the operator as well. I am not seeing this operator available in >> the current draft. Can/will this be rectified? >> >> a div b = (a - a % b) / b >> > > This turns out to be equivalent to > > (a/b)|0 > > > which is how asm.js optimizes to avoid the FPU already. > It's not equivalent for values greater than 2^31. The | version wraps around; div would give the correct answer. Waldemar -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20130725/176dc867/attachment.html>