2008-07-07 Richard Guenther <rguenther@suse.de>

2008-07-07  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-structalias.c (struct variable_info): Add is_full_var flag.
	(new_var_info): Set it to false.
	(solution_set_add): Correctly handle pointers outside a var and
	inside a field.
	(type_safe): Treat variables with is_full_var properly.
	(do_sd_constraint): Likewise.
	(do_ds_constraint): Likewise.
	(process_constraint): Remove zeroing offset for !use_field_sensitive.
	(get_constraint_for_ptr_offset): New function.
	(get_constraint_for_component_ref): For addresses at least include
	the last field of the variable.  Handle is_full_vars properly.
	(get_constraint_for_1): Factor common code, handle POINTER_PLUS_EXPR.
	(handle_ptr_arith): Remove.
	(find_func_aliases): Simplify assignment handling.
	(create_function_info_for): For parameter and result varinfos set
	is_full_var flag.
	(create_variable_info_for): Set is_full_var flag whenever we
	just created a single varinfo for a decl.
	(init_alias_vars): Initialize use_field_sensitive from
	max-fields-for-field-sensitive parameter.

	* gcc.dg/torture/pta-ptrarith-1.c: New testcase.
	* gcc.dg/torture/pta-ptrarith-2.c: Likewise.
	* gcc.dg/torture/ipa-pta-1.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@137573 138bc75d-0d04-0410-961f-82ee72b054a4