* common.opt (ftree-loop-ivcanon): Enable by default.
	* tree-ssa-loop-ivcanon.c (try_unroll_loop_completely):
	Enable complete loop unrolling.
	(canonicalize_induction_variables, tree_unroll_loops_completely):
	Reset scev info.

	* gcc.dg/tree-ssa/loop-1.c: Check that unrolling occurs already on
	tree level.

From-SVN: r88404