re PR tree-optimization/66051 (can't vectorize reductions inside an SLP group)

re PR tree-optimization/66051 (can't vectorize reductions inside an SLP group)

2015-12-03  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/66051
	* tree-vect-slp.c (vect_build_slp_tree_1): Remove restriction
	on load group size.  Do not pass in vectorization_factor.
	(vect_transform_slp_perm_load): Do not require any permute support.
	(vect_build_slp_tree): Do not pass in vectorization factor.
	(vect_analyze_slp_instance): Do not compute vectorization
	factor estimate.  Use vector size instead of vectorization factor
	estimate to split store groups for BB vectorization.

	* gcc.dg/vect/slp-42.c: New testcase.

From-SVN: r231225