tree-loop-distribution.c (enum rdg_dep_type): Add control_dd.

tree-loop-distribution.c (enum rdg_dep_type): Add control_dd.

2013-09-16  Richard Biener  <rguenther@suse.de>

	* tree-loop-distribution.c (enum rdg_dep_type): Add control_dd.
	(dot_rdg_1): Handle control_dd.
	(create_edge_for_control_dependence): New function.
	(create_rdg_edges): Add control dependences if asked for.
	(build_rdg): Likewise.
	(generate_loops_for_partition): If there are not necessary
	control stmts remove all their dependencies.
	(collect_condition_stmts, rdg_flag_loop_exits): Remove.
	(distribute_loop): Pass on control dependences.
	(tree_loop_distribution): Compute control dependences and remove
	restriction on number of loop nodes.

	* gcc.dg/tree-ssa/ldist-22.c: New testcase.

From-SVN: r202619