2012-12-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/55684
	* tree-ssa-loop-ivcanon.c (remove_redundant_iv_tests): Handle
	gracefully the case where we cannot compute the number of
	iterations at an exit.

	* gcc.dg/torture/pr55684.c: New testcase.

From-SVN: r194499