2018-04-09  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/85284
	* tree-ssa-loop-niter.c (number_of_iterations_exit_assumptions):
	Only use the niter constraining form of simple_iv when the exit
	is always executed.

	* gcc.dg/torture/pr85284.c: New testcase.

From-SVN: r259234