Ok, it appears em++ may be optimizing out some stuff that g++ isn't, as the em++ version is generating less garbage than the c++ version.
I'm using -O3 for both em++ and g++, are there any other flags I can use in g++ to get similar optimizations? Bye, Mark On Tuesday, July 28, 2015 at 7:53:31 AM UTC+12, Mark Sibly wrote: > > Hi, > > I am working on a 'transpiler' style language that outputs c++, which I > then either compile as native code to produce desktop apps, or put through > emscripten to produce web apps. > > I've recently been working on the garbage collection stuff, and decided to > run a few speed tests as I have long been worried ask.js wouldn't be up to > this sort of thing. > > But much to my surprise, in many cases, the asm.js code runs *faster* than > the native code! I can tweak some GC settings so this isn't the case, but > with default settings asm.js is about 20% faster than the corresponding > native code. > > The test code is meaningless 'thrash the GC' sort of stuff so I'm not > taking the results too seriously yet, but I'm still a bit confused - how > can this be? What sort of voodoo is asm.js up to here? > > Also: does asm.js produce garbage if it's just running 'raw' code, ie: no > API calls? > > Bye! > Mark > > > > > > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
