tree-vect-stmts.c (enum scan_store_kind): New type.

tree-vect-stmts.c (enum scan_store_kind): New type.

	* tree-vect-stmts.c (enum scan_store_kind): New type.
	(scan_store_can_perm_p): Change last argument from int * to
	vec<enum scan_store_kind> *, record precisely which permutations
	need whole vector left shift or that plus VEC_COND_EXPR.
	(vectorizable_scan_store): Adjust caller, use whole vector left shift
	and additional VEC_COND_EXPR only for those iterations that need it.

From-SVN: r272497