When you run code in Firefox, you can often see huge drop in speed for asm.js calls, which is most probably caused either by repeated compilation (which is visible in console) or by cost of js-to-asm calls. This hypothesis is further strenghtened by Luke Wagner, implementor of asm.js: one performance fault that we already know … Read more
Actually asm.js has not been created to write code by hand but only as result of a compilation from other languages. As far as I know there are no tools that validate the asm.js code. Have you tried to write the code in C lang and use Emscripten to generate the asm.js code? I strongly … Read more
Can JavaScript itself be compiled to asm.js? Not really, because of its dynamic nature. It’s the same problem as when trying to compile it to C or even to native code – you actually would need to ship a VM with it to take care of those non-static aspects. At least, such a VM is … Read more
Is asm.js code compiled in time and run? Compiled into what? asm.js is regular javascript code, and is compiled into bytecode by the JS interpreter as always. However, an interpreter with asm support is supposed to do ahead-of-time compilation, and possibly to generate more efficient code representation because of the static typing. See http://asmjs.org/ for … Read more