re PR tree-optimization/56118 (Piecewise vector / complex initialization from constants not combined)

2015-11-09  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/56118
	* tree-vectorizer.h (vect_find_last_scalar_stmt_in_slp): Declare.
	* tree-vect-slp.c (vect_find_last_scalar_stmt_in_slp): Export.
	* tree-vect-data-refs.c (vect_slp_analyze_node_dependences): New
	function.
	(vect_slp_analyze_data_ref_dependences): Instead of computing
	all dependences of the region DRs just analyze the code motions
	SLP vectorization will perform.  Remove SLP instances that
	cannot have their store/load motions applied.
	(vect_analyze_data_refs): Allow DRs without a vectype
	in BB vectorization.

	* gcc.dg/vect/no-tree-sra-bb-slp-pr50730.c: Adjust.

From-SVN: r230020