tree-vect-loop.c (vect_analyze_loop_operations): Also analyze reduction PHIs.

tree-vect-loop.c (vect_analyze_loop_operations): Also analyze reduction PHIs.

2016-07-03  Richard Biener  <rguenther@suse.de>

	* tree-vect-loop.c (vect_analyze_loop_operations): Also analyze
	reduction PHIs.
	(vect_force_simple_reduction): Record reduction def -> phi mapping.
	(vectorizable_reduction): Perform reduction PHI creation when
	visiting a reduction PHI and adjust and simplify code generation
	phase of the reduction op.  Cache dts, use fold_binary, not fold_build2.
	(vect_transform_loop): Visit reduction PHIs.
	* tree-vect-slp.c (vect_get_and_check_slp_defs): Record reduction
	defs into the SLP tree.
	(vect_build_slp_tree): Reduction defs terminate the recursion.
	* tree-vect-stmts.c (vect_get_vec_def_for_operand_1): Allow lookup
	of reduction defs.
	(vect_get_vec_defs_for_stmt_copy): Export.
	(vect_get_vec_defs): Likewise.
	* tree-vectorizer.h (struct _stmt_vec_info): Amend reduc_def
	purpose.
	(vect_get_vec_defs_for_stmt_copy): Declare.
	(vect_get_vec_defs): Likewise.

From-SVN: r249897