RE: Draft assembly PDD

[Hong Zhang]

> >If we define caller-save and callee save. The 64 register may
> >not be bad, as long as caller-save set is small.
> 
> At least a full push without a copy to the new frame is dead 
> cheap, so it's not much of a cost.

May not be true. If we use gc, we have to clear (nullify) it,
so the gc won't take the garbage.

Hong