>
> > and seeing the reaction of people,
> > I probably won't use it. The main reason for considering to use
> > the tree node for me was the possibility to make the number of iterations
> > of the loop as its operand, so that I would not need to worry about
> > keeping it alive through dce, copy/constant propagation, etc. (without
> > a statement carrying it in IL, I do not see a solution that would not
> > be just asking for introducing bugs and getting broken accidentally).
>
> One way to achieve this is to mark n_1 (in your example) as
> "do not dead strip because I know it is used" , kind of attribute((used)).
This is what as I understand LOOP_HEADER is used for.