[Bug c++/54770] sibling call optimization is not applied where it ought to be

[andy.m.jost at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54770



--- Comment #8 from Andy Jost <andy.m.jost at gmail dot com> 2012-11-20 
17:14:18 UTC ---

The workaround I mentioned in comment #5 does seem to do the trick. 

Specifically, something like this works in all the cases I've tried:



  struct MainNode : Node

  {

    virtual void H()

    {

      helper()

      this->H();

    }

    __attribute__((noinline)) void helper()

    {

      NodePtr tmp(arg);

      this->~Node();

      new(this) MainNode(tmp);

    }

  };