2013-05-13  Martin Jambor  <mjambor@suse.cz>

	PR middle-end/42371
	* ipa-prop.h (IPA_UNDESCRIBED_USE): New macro.
	(ipa_constant_data): New type.
	(ipa_jump_func): Use ipa_constant_data to hold information about
	constant jump functions.
	(ipa_get_jf_constant): Adjust to jump function type changes.
	(ipa_get_jf_constant_rdesc): New function.
	(ipa_param_descriptor): New field controlled_uses.
	(ipa_get_controlled_uses): New function.
	(ipa_set_controlled_uses): Likewise.
	* ipa-ref.h (ipa_find_reference): Declare.
	* ipa-prop.c (ipa_cst_ref_desc): New type.
	(ipa_print_node_jump_functions_for_edge): Adjust for jump function type
	changes.
	(ipa_set_jf_constant): Likewise.  Also create reference descriptions.
	New parameter cs.  Adjust all callers.
	(ipa_analyze_params_uses): Detect uncontrolled and controlled uses.
	(remove_described_reference): New function.
	(jfunc_rdesc_usable): Likewise.
	(try_make_edge_direct_simple_call): Decrement controlled use count,
	attempt to remove reference if it hits zero.
	(combine_controlled_uses_counters): New function.
	(propagate_controlled_uses): Likewise.
	(ipa_propagate_indirect_call_infos): Call propagate_controlled_uses.
	(ipa_edge_duplication_hook): Duplicate reference descriptions.
	(ipa_print_node_params): Print described use counter.
	(ipa_write_jump_function): Adjust to jump function type changes.
	(ipa_read_jump_function): New parameter CS, pass it to
	ipa_set_jf_constant.  Adjust caller.
	(ipa_write_node_info): Stream controlled use count
	(ipa_read_node_info): Likewise.
	* cgraph.c (cgraph_mark_address_taken_node): Bail out instead of
	asserting.
	* ipa-cp.c (ipcp_discover_new_direct_edges): Decrement controlled use
	count.  Remove cloning-added reference if it reaches zero.
	* ipa-ref.c (ipa_find_reference): New function.

testsuite/
	* gcc.dg/ipa/remref-0.c: New test.
	* gcc.dg/ipa/remref-1a.c: Likewise.
	* gcc.dg/ipa/remref-1b.c: Likewise.
	* gcc.dg/ipa/remref-2a.c: Likewise.
	* gcc.dg/ipa/remref-2b.c: Likewise.

From-SVN: r198821