2011-04-14  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-dse.c (struct dse_global_data, struct dse_block_local_data):
	Remove.
	(dse_initialize_block_local_data, dse_leave_block,
	record_voperand_set, get_stmt_uid): Likewise.
	(dse_possible_dead_store_p): Allow any kind of killing stmt.
	(dse_optimize_stmt): Remove voperand set handling code.
	Simplify and improve to handle any kind of killing stmt.
	(dse_record_phi): Remove.
	(dse_enter_block): Simplify.
	(tree_ssa_dse): Likewise.
	* tree-ssa-alias.c (stmt_kills_ref_p_1): Handle some builtins.

	* gcc.dg/tree-ssa/ssa-dse-14.c: New testcase.

From-SVN: r172431