2007-12-18  Sebastian Pop  <sebastian.pop@amd.com>

	PR tree-optimization/34123
	* lambda-code.c (can_duplicate_iv): New.
	(cannot_convert_modify_to_perfect_nest): New.
	(cannot_convert_bb_to_perfect_nest): New.
	(can_convert_to_perfect_nest): Split up.

	* gcc.dg/tree-ssa/pr34123.c: New test.

From-SVN: r131040