2011-01-14  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/45934
	PR tree-optimization/46302
	* ipa-prop.c (type_change_info): New type.
	(stmt_may_be_vtbl_ptr_store): New function.
	(check_stmt_for_type_change): Likewise.
	(detect_type_change): Likewise.
	(detect_type_change_ssa): Likewise.
	(compute_complex_assign_jump_func): Check for dynamic type change.
	(compute_complex_ancestor_jump_func): Likewise.
	(compute_known_type_jump_func): Likewise.
	(compute_scalar_jump_functions): Likewise.
	(ipa_analyze_virtual_call_uses): Likewise.
	(ipa_analyze_node): Push and pop cfun, set current_function_decl.

	* testsuite/g++.dg/ipa/devirt-c-1.C: New test.
	* testsuite/g++.dg/ipa/devirt-c-2.C: Likewise.
	* testsuite/g++.dg/ipa/devirt-c-3.C: Likewise.
	* testsuite/g++.dg/ipa/devirt-c-4.C: Likewise.
	* testsuite/g++.dg/ipa/devirt-c-5.C: Likewise.
	* testsuite/g++.dg/ipa/devirt-c-6.C: Likewise.
	* testsuite/g++.dg/ipa/devirt-6.C: Likewise.
	* testsuite/g++.dg/ipa/devirt-d-1.C: Likewise.
	* testsuite/g++.dg/torture/pr45934.C: Likewise.

From-SVN: r168825