2010-08-07 Richard Guenther <rguenther@suse.de>

2010-08-07  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-copy.c (cached_last_copy_of): Remove.
	(valueize_val): New function.
	(get_last_copy_of): Remove.
	(set_copy_of_val): Simplify.
	(dump_copy_of): Likewise.
	(copy_prop_visit_cond_stmt): Use valueize_val.
	(copy_prop_visit_phi_node): Properly handle unvisited names.
	Drop code managing copy-of chains.
	(init_copy_prop): Adjust.
	(fini_copy_prop): Likewise.
	(execute_copy_prop): Remove obsolete comment.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@163032 138bc75d-0d04-0410-961f-82ee72b054a4