2016-03-21  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/70288
	* tree-ssa-loop-ivcanon.c (tree_estimate_loop_size): Make sure
	we do not estimate unsimplified all-constant conditionals or
	switches as optimized away.

	* gcc.dg/torture/pr70288-1.c: New testcase.
	* gcc.dg/torture/pr70288-2.c: Likewise.

From-SVN: r234361