2009-09-09  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/41101
	* tree-ssa-pre.c (maximal_set): Remove.
	(compute_antic_aux): Treat the maximal set as implicitly all ones.
	Defer all blocks we didn't visit at least one successor.
	(add_to_exp_gen): Do not add to the maximal set.
	(make_values_for_phi): Likewise.
	(compute_avail): Likewise.
	(init_pre): Do not allocate the maximal set.
	(execute_pre): Do not dump it.

	* gcc.c-torture/compile/pr41101.c: New testcase.

From-SVN: r151561