2015-11-13 Richard Biener <rguenther@suse.de>

2015-11-13  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/68306
	* tree-vect-data-refs.c (verify_data_ref_alignment): Move
	loop related checks ...
	(vect_verify_datarefs_alignment): ... here.
	(vect_slp_analyze_and_verify_node_alignment): Compute and
	verify alignment of the single DR that it matters.
	* tree-vect-stmts.c (vectorizable_store): Add an assert.
	(vectorizable_load): Add a comment.
	* tree-vect-slp.c (vect_analyze_slp_cost_1): Fix DR used
	for determining load cost.

	* gcc.dg/pr68306.c: Adjust.
	* gcc.dg/pr68306-2.c: New testcase.
	* gcc.dg/pr68306-3.c: Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@230310 138bc75d-0d04-0410-961f-82ee72b054a4