[Bug ipa/69589] [6 Regression] ICE in initialize_node_lattices, at ipa-cp.c:971

["jamborm at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69589

--- Comment #13 from Martin Jambor <jamborm at gcc dot gnu.org> ---
(In reply to kugan from comment #11)
> In remove_unreachable_nodes, just before ipa-cp, this node becomes local
> (address taken is false and local.local = true). After that, when
> ipa_propagate_frequency is run, which updates the frequency to zero. I think
> we should check the frequency at this point in time and remove such nodes.

If remove_unreachable_nodes keeps the node around for comdat reasons,
we cannot remove it just because it has zero estimated frequency
(unless remove_unreachable_nodes was wrong and should have removed the
node itself).

I think that remove_unreachable_nodes should either remove the node,
or not set it to local (or set something like force_output or
forced_by_abi, if it is some really weird case).