2016-06-01  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/71366
	* tree-ssa-loop-ivcanon.c (edges_to_remove): New global.
	(unloop_loops): Move removing edges here ...
	(try_unroll_loop_completely): ... from here.
	(try_peel_loop): ... and here.
	(tree_unroll_loops_completely_1): Track parent loops via
	bitmap of header BBs.
	(tree_unroll_loops_completely): Adjust for that.

	* gcc.dg/torture/pr71366-1.c: New testcase.
	* gcc.dg/torture/pr71366-2.c: Likewise.

From-SVN: r236993