That would be amazing for languages that compile to JavaScript and have to support 64-bit integers. In the Scala.js compiler, we have managed to get pretty clos

That would be amazing for languages that compile to JavaScript and have to support 64-bit integers. In the Scala.js compiler, we have managed to get pretty close (around 3x) the speed of Int32 arithmetics, but a native implementation would easily get us closer to 1x (if appropriately specified and optimized by VMs).