PR tree-optimization/68021
	* tree-ssa-loop-ivopts.c (get_computation_aff): Set ratio to 1 if
	when computing the value of biv cand by itself.

	gcc/testsuite/ChangeLog
	PR tree-optimization/68021
	* gcc.dg/tree-ssa/pr68021.c: New test.

From-SVN: r233269