2013-04-11  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/56878
	* tree-flow.h (outermost_invariant_loop_for_expr): Declare.
	* tree-ssa-loop-ivopts.c (outermost_invariant_loop_for_expr):
	New function.
	* tree-vect-data-refs.c (vect_enhance_data_refs_alignment):
	Prefer to align the DR with the most invariant base address.

From-SVN: r197769