That's funny.

Never been using C, I guess-coded my way to this little program:

    int pow(a)
    {
     for (int i=0;i<10;i++) a=a*2+1;
     return a;
    }

    int main()
    {
     return pow(1);
    }

And as far as I understand the output, the compiler on the server reduced it to a constant:

    (module
      (table 0 anyfunc)
      (memory $0 1)
      (export "memory" (memory $0))
      (export "pow" (func $pow))
      (export "main" (func $main))
      (func $pow (param $0 i32) (result i32)
        (i32.or
          (i32.shl
            (get_local $0)
            (i32.const 10)
          )
          (i32.const 1023)
        )
      )
      (func $main (result i32)
        (i32.const 2047)
      )
    )

Looking at the wasm code, I really hate it that I cannot edit it by hand and have the browser execute it. That would be fun.