title: Emscripten seems to not use asm.js
body: <p>I've read in emscripten docs that emscripten compiles to asm.js optimisations by default, but if I open compiled code I can't find any "use asm;" how to get it? Should I add it manually or am I compiling wrong?</p>
  
  <p>At the moment I am using  "emcc main.c -o out.html" to compile, also tried with -02 flag.</p>