Limit AA walking in IPA summary generation

Limit AA walking in IPA summary generation

2019-01-20  Martin Jambor  <mjambor@suse.cz>

	PR ipa/87615
	* ipa-prop.h (struct ipa_func_body_info): Replaced field aa_walked
	with aa_walk_budget.
	* cgraph.h (ipa_polymorphic_call_context::get_dynamic_type): Add
	aa_walk_budget_p parameter.
	* ipa-fnsummary.c (unmodified_parm_1): New parameter fbi.  Limit AA
	walk.  Updated all callers.
	(unmodified_parm): New parameter fbi, pass it to unmodified_parm_1.
	(eliminated_by_inlining_prob): New parameter fbi, pass it on to
	unmodified_parm.
	(will_be_nonconstant_expr_predicate): New parameter fbi, removed
	parameter info.  Extract info from fbi.  Pass fbi to recursive calls
	and to unmodified_parm.
	(phi_result_unknown_predicate): New parameter fbi, removed parameter
	info, updated call to will_be_nonconstant_expr_predicate.
	(param_change_prob): New parameter fbi, limit AA walking.
	(analyze_function_body): Initialize aa_walk_budget in fbi.  Update
	calls to various above functions.
	* ipa-polymorphic-call.c (get_dynamic_type): Add aa_walk_budget_p
	parameter.  Use it to limit AA walking.
	* ipa-prop.c (detect_type_change_from_memory_writes): New parameter
	fbi, limit AA walk.
	(detect_type_change): New parameter fbi, pass it on to
	detect_type_change_from_memory_writes.
	(detect_type_change_ssa): Likewise.
	(aa_overwalked): Removed.
	(parm_preserved_before_stmt_p): Assume fbi is never NULL, stream line
	accordingly, adjust to the neew AA limiting scheme.
	(parm_ref_data_preserved_p): Likewise.
	(ipa_compute_jump_functions_for_edge): Adjust call to
	get_dynamic_type.
	(ipa_analyze_call_uses): Likewise.
	(ipa_analyze_virtual_call_uses): Pass fbi to detect_type_change_ssa.
	(ipa_analyze_node): Initialize aa_walk_budget.
	(ipcp_transform_function): Likewise.
	* tree-ssa-sccvn.c (eliminate_dom_walker::eliminate_stmt): Update call
	to get_dynamic_type.

From-SVN: r268107