On Thu, May 04, 2017 at 12:42:03PM +0200, Richard Biener wrote:
> > +static tree
> > +unwrap_c_maybe_const (tree *tp, int *walk_subtrees, void *)
> > +{
> > + if (TREE_CODE (*tp) == C_MAYBE_CONST_EXPR)
> > + {
> > + *tp = C_MAYBE_CONST_EXPR_EXPR (*tp);
> > + /* C_MAYBE_CONST_EXPRs don't nest. */
> > + *walk_subtrees = false;
>
> This changes trees in-place -- do you need to operate on a copy?
Ugh, yes. But I can't simply copy_node, because that creates new VAR_DECLs,
and operand_equal_p would consider them unequal. Hmm... We need something
else.
Marek
