* tree-ssa-loop-ivopts.c (extract_cond_operands): Split from

	* tree-ssa-loop-ivopts.c (extract_cond_operands): Split from
	find_interesting_uses_cond.
	(find_interesting_uses_cond): Use extract_cond_operands.
	(rewrite_use_compare): Use extract_cond_operands and
	force_gimple_operand_bsi.  Do not call update_stmt.
	(determine_use_iv_cost_condition): Use extract_cond_operands.
	Return cheaper of using original bound and changing the exit bound.

	* gcc.dg/tree-ssa/loop-22.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@120697 138bc75d-0d04-0410-961f-82ee72b054a4