re PR middle-end/50262 (PTA doesn't disambiguate locally allocated heap objects from pointed to by arguments)

2013-11-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/50262
	* tree-ssa-alias.h (struct pt_solution): Split
	vars_contains_global into vars_contains_nonlocal,
	vars_contains_escaped and vars_contains_escaped_heap.
	* tree-ssa-structalias.c (label_visit): Expand comment.
	(handle_lhs_call): Adjust comment.
	(set_uids_in_ptset): Set the new flags appropriately.
	(pt_solution_set): Adjust.
	(pt_solution_set_var): Likewise.
	(pt_solution_ior_into): Likewise.
	(pt_solution_includes_global): Likewise.
	(pt_solutions_intersect_1): Optimize escaped handling.
	(compute_points_to_sets): Remove heap variable globalization.
	(ipa_escaped_pt): Adjust initializer.
	(pass_data_ipa_pta): Do not run TODO_update_ssa.
	* gimple-pretty-print.c (pp_points_to_solution): Print split
	flags.
	* tree-ssa-alias.c (dump_points_to_solution): Likewise.

	* gcc.dg/tree-ssa/alias-28.c: New testcase.
	* gcc.dg/strlenopt-1.c: Adjust.
	* gcc.dg/strlenopt-1f.c: Likewise.

From-SVN: r204845