2013-09-23  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/58464
	* tree-ssa-pre.c (phi_trans_lookup): Remove.
	(phi_trans_add): Change to add conditionally on being not
	present.
	(phi_translate_1): Remove recursion detection here.
	(phi_translate): Pre-seed the cache with NULL to catch
	recursion here in a more generic way.
	(bitmap_find_leader): Adjust comment.
	(get_representative_for): Dump value-numbers.
	(create_expression_by_pieces): Likewise.
	(insert_into_preds_of_block): Likewise.

	* g++.dg/torture/pr58464.C: New testcase.

From-SVN: r202826