re PR middle-end/56988 (ipa-cp incorrectly propagates a field of an aggregate)

re PR middle-end/56988 (ipa-cp incorrectly propagates a field of an aggregate)

2013-05-02  Martin Jambor  <mjambor@suse.cz>

	PR middle-end/56988
	* ipa-prop.h (ipa_agg_replacement_value): New flag by_ref.
	* ipa-cp.c (ipa_get_indirect_edge_target_1): Also check that by_ref
	flags match.
	(find_aggregate_values_for_callers_subset): Fill in the by_ref flag of
	ipa_agg_replacement_value structures.
	(known_aggs_to_agg_replacement_list): Likewise.
	* ipa-prop.c (write_agg_replacement_chain): Stream by_ref flag.
	(read_agg_replacement_chain): Likewise.
	(ipcp_transform_function): Also check that by_ref flags match.

testsuite/
	* gcc.dg/ipa/pr56988.c: New test.

From-SVN: r198540